Publications
Understanding the sources of marine litter in remote islands: The Galapagos islands as a case study
Marine litter, particularly plastic bottles, poses a significant threat to remote islands like the Galápagos. A study analyzing 60 beaches from 2018 to 2022 found that 76% were severely polluted with over 34 bottles per 100 meters. Most bottles (71%) originated from Peru, followed by China (17%) and Ecuador (9%), despite local products being predominantly Ecuadorian. Polyethylene terephthalate bottles with lids, which facilitate litter dispersal, accounted for 88% of the total, indicating that distant sources, mainly in South America, are the primary contributors. However, bottle ages suggest that a substantial portion—10% from Peru, 26% from Ecuador, and all from China—likely stems from ship dumping. The findings underscore the need to address land-based litter leakage in South America and enforce stricter regulations against ship waste dumping to mitigate marine pollution in the Galápagos.
Priorities for ecological research on cetaceans in the Galápagos Islands
Research on cetaceans in the Galápagos Islands highlights critical knowledge gaps that hinder conservation efforts. The study identifies five key research priorities—spatiotemporal occurrence, population assessment, health assessment, social ecology, and trophic ecology—to better understand and protect the 23 cetacean species present, including nine dolphins, one sperm whale, and three baleen whales. While coastal and oceanic habitats support these species year-round or seasonally, research remains sporadic and underfunded. The study recommends integrated sampling protocols, open data repositories, and citizen science initiatives (e.g., cruise ships and whale-watching tours) to optimize data collection despite logistical challenges. These efforts aim to advance ecological understanding of marine megafauna, their role in connectivity, and climate change mitigation, while informing conservation strategies for the UNESCO World Heritage Site.
“Rethink and reset” tourism in the Galapagos Islands: Stakeholders' views on the sustainability of tourism development
Sustainable tourism in the Galápagos Islands hinges on rethinking and resetting its development model, with stakeholders emphasizing the need for inclusive vision-setting, addressing community needs like basic services, health, and education, and balancing regulated high-end tourism with informal low-cost options. A decade after implementing the Ecotourism Model, this study highlights critical challenges and opportunities, offering insights applicable beyond the Galápagos. Researchers engaged tourism service providers and regulators in Puerto Ayora to explore how sustainability has been integrated into tourism-conservation links post-pandemic.
Decarbonization of the Galapagos Islands. Proposal to transform the energy system into 100% renewable by 2050
A fully decarbonized energy system for the Galápagos Islands, leveraging 100% renewable sources by 2050, is feasible through strategic legal frameworks and economic investments. This proposal addresses the archipelago's reliance on fossil fuels, which threatens its UNESCO World Heritage status due to environmental and sensory impacts. The study identifies significant potential in photovoltaic and wind solar energy, aligning with Ecuador’s National Plan All a Life. Transition strategies include electrifying transportation and household appliances while scaling renewable energy infrastructure to meet growing demand. By phasing out fossil fuels, the plan aims to preserve the Galápagos' ecological integrity while supporting its tourism-driven economy.
Microplastic distribution and composition on two Galápagos island beaches, Ecuador: Verifying the use of citizen science derived data in long-term monitoring
A study on two Galápagos beaches reveals that citizen science can effectively monitor microplastic contamination, with 93% of visually identified particles confirmed as microplastics or rubber. The research, conducted by students from high schools and universities, found plastic abundances ranging from 0 to 2524 particles per square meter—among the highest reported in the Galápagos. Significant accumulation gradients were observed near waterlines, with one beach showing four-fold higher concentrations at a sea turtle nesting site. No seasonal trends were detected over a year. This approach offers a cost-effective method for long-term monitoring and conservation efforts.
Multicriteria Decision Analysis of Suitable Location for Wind and Photovoltaic Power Plants on the Galápagos Islands
A study identifies the Galápagos Islands as highly suitable for wind and photovoltaic power plants, with potential for 10 MW solar capacity on each island. Using Geographical Information Systems (GIS) combined with Multicriteria Decision Methods like Analytical Hierarchical Processes and Ordered Weighted Average, researchers assessed optimal locations to minimize environmental impact while fulfilling energy needs. The analysis revealed that Baltra Island is particularly promising for wind power, though other islands also show potential. This approach offers a sustainable solution to reduce reliance on fossil fuels, which have been degrading air quality and affecting the island's unique biodiversity.
Multiple anthropogenic stressors in the Galápagos Islands' complex social–ecological system: Interactions of marine pollution, fishing pressure, and climate change with management recommendations
Anthropogenic stressors, including marine pollution, illegal fishing, and climate change, are threatening the ecological integrity of the Galápagos Islands. A recent review highlights how pollutants like oil spills, persistent organic compounds, metals, and ocean plastics are compromising the health and survival of endemic species, such as marine iguanas and Galápagos sea lions. Climate change exacerbates these impacts during El Niño events, pushing species toward population tipping points. The study emphasizes the need for multidisciplinary management strategies to mitigate these interconnected threats and preserve the Galápagos' unique biodiversity.
Caldera resurgence during the 2018 eruption of Sierra Negra volcano, Galápagos Islands
The 2018 eruption of Sierra Negra volcano in the Galápagos Islands revealed a unique caldera resurgence mechanism, where prolonged magma supply to a shallow reservoir drove significant uplift and seismicity over 13 years. Despite co-eruptive subsidence of up to 8.5 meters, the inner-caldera experienced permanent resurgence of 1.5 meters due to trapdoor faulting. This study combines multiparametric data to demonstrate how intra-caldera faulting influences resurgence and eruption dynamics in the absence of well-developed rift systems, providing new insights into volcanic behavior in shield volcanoes.
Climate and sea surface trends in the Galapagos Islands
The Galápagos Islands have experienced significant climate changes, including a 0.6°C warming and increased dryness since the early 1980s, with the wet season now delayed by 20 days. While future projections suggest potential increases in precipitation (20-70%) and more extreme conditions, these may be overestimated due to limitations in capturing Eastern-Pacific ENSO dynamics. Additionally, sea surface temperatures have risen by 1.2°C over two decades, posing risks to marine ecosystems, coral health, invasive species proliferation, and human infrastructure. The study analyzed existing meteorological observations and secondary datasets to highlight the urgent need for resilient climate adaptation policies.
Control of the Little Fire Ant, Wasmannia Auropunctata, on Santa Fe Island in the Galapagos Islands
A study on Santa Fe Island, Galápagos, found that conventional insecticide treatments targeting the little fire ant (Wasmannia auropunctata) were ineffective due to their failure to reach queen ants nestled underground. Despite prior control measures, including residual insecticides like aldrin and DDT, W. auropunctata persisted on tourist trails, raising concerns about potential island-wide spread during the rainy season. The research highlights the limitations of surface-applied insecticides in controlling this invasive species, which poses ecological threats to the fragile Galápagos ecosystem.
Dynamic earthquake triggering response tracks evolving unrest at Sierra Negra volcano, Galápagos Islands
Research at Sierra Negra volcano, Galápagos Islands, reveals that the intensity of dynamically triggered earthquakes increases with the stress state during volcanic inflation. The study demonstrates that as magma reservoir inflation elevates local stress, the response to dynamic strain perturbations intensifies, with seismicity rates rising in tandem with peak dynamic strain. Conversely, post-eruptive subsidence and reduced stress levels diminish this triggering effect, even at equivalent dynamic strains. This finding provides critical insights into the controls on dynamic earthquake triggering and suggests that monitoring seismic responses to dynamic stresses could serve as an indicator for volcanic unrest evolution.
Economic costs of biological invasions in Ecuador: the importance of the Galapagos Islands
A comprehensive analysis of the economic costs of biological invasions in Ecuador reveals that over 99% of reported costs, ranging from US$86.17 million to US$626 million between 1983 and 2017, are attributed to the Galápagos Islands. The study, utilizing the InvaCost database, identified feral goats (Capra hircus) as the costliest invasive species at US$20 million, followed by Aedes mosquitoes causing dengue fever. Mixed-taxa invasions accounted for 61% of robust costs, with national park authorities incurring the highest expenses. Notably, over 70% of invasive alien species in Ecuador lacked reported economic data, suggesting significant underestimation of actual impacts. The findings underscore the severe economic burden of biological invasions, particularly in mega-diverse regions like the Galápagos.
Effect of topographic complexity on species richness in the Galápagos Islands
Topographic complexity (TC) significantly influences species richness in the Galápagos Islands, with its impact varying among taxonomic groups and scales. While no single TC index consistently explained variation across all taxa, incorporating at least one index improved models for all 12 studied groups. Standard deviation of slope was the most common index to enhance predictions, highlighting TC's role as a critical component in species richness dynamics. The study challenges the assumption that TC follows a predictable hump-shaped trajectory with island age, emphasizing the need for multi-dimensional measures to fully capture its biological significance.
Estimating Rooftop Solar Potential in Urban Environments: A Generalized Approach and Assessment of the Galápagos Islands
A minimum of 21% and 27% of rooftop areas in Puerto Baquerizo Moreno and Puerto Ayora, respectively, must be covered with solar panels to meet current electricity demand in the Galápagos Islands. This study introduces a cost-effective method using low-resolution data to estimate rooftop solar potential, addressing gaps in high-resolution datasets for remote or developing regions. The approach allows local communities and decision-makers to assess solar viability before detailed analysis. Findings reveal Puerto Baquerizo Moreno's higher solar production potential, offering land-efficient renewable energy solutions while preserving natural protected areas.
Heavy metal contents, mobility and origin in agricultural topsoils of the Galápagos Islands
A study of agricultural topsoils from the Galápagos Islands reveals high levels of cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), nickel (Ni), and zinc (Zn) compared to global standards, with potential ecological and health risks. Lead (Pb) levels were low, while uranium (U) concentrations were similar to other regions. The research found that Ni, Co, Cr, Pb, and U tend to accumulate with increased weathering duration, suggesting natural sources. Conversely, Cd mobility rises with soil age, indicating possible agrochemical influence, particularly on Santa Cruz Island. The study highlights the need for systematic soil analysis in pristine areas to establish background levels and develop quality standards, ensuring crop safety and environmental health on this unique island chain.
Impacts of Coral Growth on Geochemistry: Lessons From the Galápagos Islands
Coral skeletal architecture significantly impacts geochemical climate reconstructions, potentially introducing biases that alter paleoclimate interpretations. This study demonstrates that integrating coral density data with geochemistry can improve the accuracy of sea surface temperature (SST) reconstructions by up to 20%. Researchers analyzed paired geochemistry-density records from three Porites lobata corals at Wolf Island in the Galápagos, categorizing sampling transects based on skeletal architecture quality. They found that suboptimal transects, characterized by off-axis corallite orientation or changing growth direction, correlated with nonclimatic variations in trace elements like Sr/Ca, Ba/Ca, and Mg/Ca. By excluding these transects, the study achieved reconstructed SSTs closer to instrumental means while reducing reconstruction errors. These findings highlight the importance of skeletal architecture in refining coral-based paleoclimate records.
Moment Tensors of Ring‐Faulting at Active Volcanoes: Insights Into Vertical‐CLVD Earthquakes at the Sierra Negra Caldera, Galápagos Islands
A new method to estimate ring-fault parameters from vertical-CLVD earthquakes has been developed, offering insights into the kinematics and structures below active volcanoes. The study demonstrates that long-period seismic waves can resolve two key moment tensor components—vertical-CLVD and vertical strike-slip—while a third component (vertical dip-slip) remains indeterminate due to shallow source depth. Applied to earthquakes during the 2005 and 2018 volcanic activities at Sierra Negra caldera, Galápagos Islands, this approach validated ring-fault geometry consistent with geodetic studies and revealed significant differences in slip direction and location between two events. This breakthrough enables global examination of ring-fault systems, enhancing understanding of volcanic processes.
Plastic contamination of a Galapagos Island (Ecuador) and the relative risks to native marine species
A comprehensive analysis of plastic contamination in the Galapagos Islands reveals widespread yet low concentrations of microplastics, with significant accumulation on east-facing beaches influenced by ocean currents. The study found that only 2% of macroplastic waste originates from local littering and waste management, indicating a substantial input from external sources. Microplastics were detected in all seven marine invertebrate species examined, confirming their presence throughout the Galapagos marine food web. Additionally, a priority scoring analysis identified 27 marine vertebrate species at high risk due to plastic ingestion or entanglement, including pinnipeds, seabirds, turtles, and sharks, underscoring the urgent need for targeted conservation efforts.
Soil development and mineral transformations along a one‐million‐year chronosequence on the Galápagos Islands
Soil development on the Galápagos Islands follows distinct paths depending on climate, with humid zones showing rapid transitions through early stages of pedogenesis. Research along a one-million-year chronosequence reveals that soils aged ≤4,300 years exhibit andic properties dominated by allophane and ferrihydrite, while older soils (≥26,000 years) transition to illitic–vermiculitic phases, eventually developing into Oxisol-like profiles. Dry zones, however, show less development, with Entisols at 26,000 years and Vertisols dominated by smectite at 813,000 years. This study highlights the divergent pedogenic processes in humid versus dry climates, offering insights into soil functioning and ecosystem evolution on this unique archipelago.
The effects of climate change on wildlife biodiversity of the galapagos islands
Climate change is significantly altering the biodiversity of the Galápagos Islands, with increased frequency and intensity of ENSO (El Niño-Southern Oscillation) and La Niña events disrupting both marine and terrestrial ecosystems. While ENSO events negatively impact marine biodiversity due to extreme weather patterns, they benefit many terrestrial species by increasing rainfall and food availability. Conversely, La Niña years provide recovery periods for marine life but often worsen conditions for terrestrial species. Additionally, broader climate variability unrelated to ENSO and La Niña further strains both marine and terrestrial biodiversity. A systematic review of these impacts reveals that the Galápagos Islands' unique ecosystems are under severe threat from climate change, with far-reaching implications for similar archipelagos worldwide. The study highlights the need for targeted conservation strategies to mitigate these effects.
Uplift and Seismicity Driven by Magmatic Inflation at Sierra Negra Volcano, Galápagos Islands
Research at Sierra Negra Volcano, Galápagos Islands, reveals that magma accumulation in a shallow sill drives complex patterns of surface uplift and seismicity before eruptions. The study found that the rate of uplift varied significantly over 13 years, with a total inflation of 6.5 meters prior to the 2018 eruption. Seismicity increased exponentially with total uplift as differential stress rose, while the Gutenberg-Richter b-value decreased, indicating a transition to more brittle crustal behavior. Large earthquakes (M > 4) in the final six months before the eruption temporarily regulated stress without affecting the overall uplift rate. Post-eruption subsidence of 8.5 meters was followed by a period of low seismicity and higher b-values, reflecting a relaxed fault system. These findings support theoretical models of elastic-brittle mechanics and underscore the importance of integrating deformation and seismicity data for eruption forecasting in similar volcanic settings.
Urban living influences the nesting success of Darwin’s finches in the Galápagos Islands
Urban living significantly boosts the nesting success of Darwin's finches (Geospiza fuliginosa) during dry years, despite introducing trade-offs. A study on San Cristóbal Island found that urban finches built more nests, laid more eggs, and produced more fledglings than their nonurban counterparts. However, every urban nest contained anthropogenic debris—such as string or plastic—which caused 18% nestling mortality due to entanglement or ingestion. This suggests that while urbanization may buffer the effects of limited natural resources in the Galápagos Islands, it also poses risks from human-made materials. The research quantified nesting behaviors and mortalities in both urban and nonurban areas, revealing a complex balance between the benefits of supplemental food and the costs of anthropogenic contamination.
“One health" inspired SARS-CoV-2 surveillance: The Galapagos Islands experience
A collaborative 'One Health' approach successfully controlled the COVID-19 outbreak on the Galápagos Islands by May 2020, when Latin America was experiencing rapid pandemic spread. The Agencia de Regulación y Control para la Bioseguridad y Cuarentena de Galápagos (ABG), with support from the One Health Research Group at Universidad de Las Américas, established 'LabGal' to conduct molecular diagnostics for SARS-CoV-2. Leveraging prior experience in zoonotic disease surveillance on livestock, this initiative alleviated the strain on Ecuador's public health system and contributed to early outbreak containment.
An Attempt to Characterize the “3S” (Sea, Sun, and Sand) Parameters: Application to the Galapagos Islands and Continental Ecuadorian Beaches
Galápagos Islands outperform continental Ecuadorian beaches in the '3S' (Sea, Sun, and Sand) parameters critical for tourism. The study analyzed 64 beaches—10 in Galápagos and 54 on mainland Ecuador—finding that Galápagos boasts white sand, blue water, and high sunshine hours, while continental beaches lag with darker sand and less appealing water colors. Using exploratory and bibliographical methods, including lab analysis of sand samples and light-hour data from international archives, researchers compared these findings to global 3S tourism destinations. To boost 3S tourism, the study recommends enhancing complementary attractions like culture, gastronomy, and architecture while developing new coastal routes.
Characterization of deep-sea benthic invertebrate megafauna of the Galapagos Islands
A groundbreaking expedition to the Galapagos Islands revealed 30 previously undescribed deep-sea benthic invertebrate taxa, including five new genera (2 sponges and 3 cnidarians), marking a significant advancement in our understanding of this pristine yet understudied region. The research, conducted using a Remotely Operated Vehicle (ROV) system, explored depths ranging from 290 to 3,373 meters across seven sites, capturing over 85 hours of footage and collecting 90 specimens for analysis. The study documented diverse deep-sea communities, such as cold-water coral gardens and soft-sediment faunal assemblages, providing a baseline for assessing future impacts from climate change and anthropogenic pressures. These findings have directly informed the establishment of fully protected deep-water areas within the Galapagos Marine Reserve, aimed at preserving these unique ecosystems in an era of rapid environmental change.
Colored Microbial Coatings in Show Caves from the Galapagos Islands (Ecuador): First Microbiological Approach
A groundbreaking study reveals the hidden microbial diversity thriving within the subterranean world of the Galápagos Islands, particularly in their volcanic caves. Using advanced field emission scanning electron microscopy (FESEM), researchers identified abundant filamentous bacteria and Actinobacteria-like cells encased in extracellular polymeric substances (EPS) on moonmilk and coralloid speleothems from Santa Cruz Island's Bellavista and Royal Palm Caves. Analysis of 16S rDNA uncovered bacterial phylotypes linked to critical biogeochemical cycles, including carbon, nitrogen, iron, and sulfur, alongside others associated with pollutants. This first microbiological approach underscores the ecological significance of these subterranean geoheritage sites, emphasizing their conservation value as unique ecosystems within one of Earth's most biodiverse regions.
Decarbonizing the Galapagos Islands: Techno-Economic Perspectives for the Hybrid Renewable Mini-Grid Baltra–Santa Cruz
A hybrid renewable mini-grid system for Baltra–Santa Cruz, representing 62% of the Galapagos Islands' electricity generation mix, could significantly reduce diesel consumption and electricity costs while increasing renewable energy share. By installing 18.25 MWp of photovoltaic panels and 20.68 MWh of battery capacity, the Levelized Cost of Electricity (LCOE) could drop from 32.06 to 18.95 USc/kWh, raising the renewable energy share from 18% to 39%. Energy efficiency measures could further lower LCOE to 17.10 USc/kWh. The study, using HOMER Pro for techno-economic assessments, also highlights distributed energy as a key strategy for local community involvement in the transition and proposes a resilient business model combining auctions and energy community models.
Effects of tourism growth in a UNESCO World Heritage Site: resource-based livelihood diversification in the Galapagos Islands, Ecuador
Tourism growth in the Galápagos Islands, while benefiting local economies, poses challenges to sustainable development by constraining traditional livelihoods like fishing and agriculture. A study reveals that while tourism offers diversification opportunities, its appeal varies significantly among residents, with notable obstacles hindering transitions. Using a mixed-methods approach, researchers analyzed perceptions, motivations, and actions of farmers and fishers on the three most populated islands. The findings underscore the need to balance conservation goals with tourism expansion to ensure long-term sustainability in this UNESCO World Heritage Site.
From motivation to segmentation in coastal and marine destinations: a study from the Galapagos Islands, Ecuador
A study of the Galápagos Islands reveals two distinct tourist segments based on their motivations: 'Multiple Motives,' characterized by a strong preference for sun and beach activities, and 'Eco-coastal,' driven by interests in marine life, national parks, and discovering unique flora and fauna. The research, conducted through 407 questionnaires analyzed using multivariate statistical techniques, identified six key motivational factors influencing visitor behavior. These findings provide actionable insights for service providers and institutions to tailor their offerings effectively in coastal and marine destinations.
Historical Ecology and Archaeology in the Galápagos Islands
The Galápagos Islands, renowned for their pristine nature and biological significance, have a complex human history that challenges the perception of ecological untouchedness. A six-year interdisciplinary study on San Cristóbal Island, particularly focusing on the 19th-century sugar plantation Hacienda El Progreso, reveals significant anthropogenic transformations in the archipelago's ecosystems. This research integrates historical ecology, archaeology, and ecological studies to demonstrate how human activities, driven by globalization, have reshaped island habitats into novel ecosystems. The study also explores changing perceptions of nature and ecotourism's role in conservation, highlighting the intricate interplay between human interests and biological preservation.
Linking seascape with landscape genetics: Oceanic currents favour colonization across the Galápagos Islands by a coastal plant
Oceanic currents play a significant role in facilitating gene flow and population connectivity among distant populations of the coastal plant Cryptocarpus pyriformis in the Galápagos Islands. This study reveals that sea-driven seed dispersal, rather than inland movement, is the primary mechanism connecting populations across islands, as supported by genetic analysis using 1806 SNPs. The research employed landscape and seascape genetics approaches to test four hypotheses regarding dispersal patterns, confirming that isolation by sea resistance best explains inter-island gene flow. These findings highlight the importance of integrating marine and terrestrial ecological frameworks to understand the distribution and connectivity of thalassochorous species.
Optimal Sizing and Scheduling of Hybrid Energy Systems: The Cases of Morona Santiago and the Galapagos Islands
Hybrid energy systems (HESs) combining photovoltaic (PV), wind, diesel, and battery technologies offer economically viable and environmentally sustainable solutions for electrifying isolated communities. For the Galápagos Islandsan optimal HES configuration of PV-wind-battery achieves a levelized cost of energy (LCOE) of 0.36 $/kWh, outperforming other setups in both economic and environmental terms. In contrast, Morona Santiago’s tropical forest setting benefits most from a PV-diesel-battery system with an LCOE of 0.37 $/kWh. This study applies mathematical programming to assess techno-economic feasibility, demonstrating HESs' potential to reduce fossil fuel dependence in rural Ecuador while providing a scalable decision-support tool for similar projects globally.
Roadkill of birds in Galapagos Islands: a growing need for solutions
A significant increase in bird roadkill on the Galápagos Islands highlights urgent conservation challenges. The study, published in Avian Conservation and Ecology, found that road mortality poses a growing threat to native bird populations, particularly in areas with rising vehicle traffic. Researchers analyzed roadkill data to assess patterns and risks, emphasizing the need for targeted mitigation strategies. Their findings underscore the importance of proactive measures, such as wildlife crossings or traffic management, to protect these vulnerable species. This work provides critical insights into the impact of infrastructure development on biodiversity in UNESCO-listed sites like the Galápagos.
The effects of Coronavirus (COVID-19) on expected tourism revenues for natural preservation. The case of the Galapagos Islands
COVID-19 significantly disrupted tourism revenues for the Galápagos Islands, with potential losses reaching half of 2020's expected earnings. This study quantifies the impact on the Galápagos National Park (GNP), a critical funding source for conservation efforts. By analyzing seasonal visitor trends and entrance fee revenue, researchers projected severe financial strain under optimistic scenarios. The findings underscore the urgent need for alternative funding mechanisms to sustain preservation activities amid prolonged travel restrictions. Recommendations include diversifying revenue streams to mitigate long-term consequences on biodiversity protection in this UNESCO World Heritage Site.
Tourism in Continental Ecuador and the Galapagos Islands: An Integrated Coastal Zone Management (ICZM) Perspective
Ecuador lacks cohesive public policies for integrated management of 3S tourism (sustainable, solidarity, and community-based), hindering its potential as a valuable economic alternative. A SWOT analysis identified strengths in policies, responsibilities, institutions, and citizen participation, while weaknesses included regulations and education for sustainability. Opportunities lie in strategies, instruments, and information, but threats include economic resources and training. The study emphasizes the need to consolidate 3S tourism as state policy to improve coastal economies and reverse Ecuador's deteriorating image. It used a literature review across ten key aspects of ICZM (Integrated Coastal Zone Management) to assess tourism in continental Ecuador and the Galápagos Islands.
Agriculture changes soil properties on the Galápagos Islands – two case studies
Agricultural expansion on the Galápagos Islands significantly alters soil properties, threatening sustainability. A study comparing arable and forest soils on Santa Cruz (El Cascajo) and San Cristóbal (Cerro Verde) found that intensive farming reduces organic carbon stocks by 25% at Cerro Verde—though not significantly at El Cascajo—and decreases microbial biomass carbon and dissolved organic carbon. Nutrient imbalances, such as increased nitrate-N and decreased ammonium-N, along with pesticide residues, suggest agrochemical impacts. These findings highlight the need for sustainable agricultural practices to preserve soil health in this UNESCO World Heritage Site.
Diverse Traits Contribute to Salinity Tolerance of Wild Tomato Seedlings from the Galapagos Islands
Wild tomato species endemic to the Galápagos Islands exhibit remarkable salinity tolerance, outperforming commercial tomato lines under high-salt conditions. This resilience, likely due to natural selection in their saline coastal habitats, positions them as a valuable genetic resource for enhancing salt tolerance in cultivated tomatoes. Researchers analyzed over 20 traits related to growth, physiology, and ion content in 67 accessions of Solanum cheesmaniae and Solanum galapagense, alongside two commercial lines (Solanum lycopersicum), using a 10-day hydroponic salt treatment. The study identified specific accessions (LA0317, LA1449, LA1403) with exceptionally high tolerance, suggesting potential for breeding programs. Publicly available data and tools further support the exploration of these traits to improve crop resilience.
Human activity can influence the gut microbiota of Darwin's finches in the Galapagos Islands
Human activity in the Galápagos Islands alters the gut microbiota of Darwin's finches, with significant differences observed between species and sites. The study found that small ground finches (Geospiza fuliginosa) and medium ground finches (Geospiza fortis) exhibit distinct bacterial diversity patterns depending on human presence—medium ground finches show reduced bacterial diversity in areas with humans, while small ground finches remain unaffected. Contrary to predictions, the greatest microbial divergence between species occurred in human-influenced sites, highlighting complex interactions between diet, environment, and gut microbiota. The research compared finch microbiota across sites with varying human influence, using dietary preferences as a key factor, providing insights into how anthropogenic changes reshape ecological and evolutionary processes.
Hydroids (Cnidaria, Hydrozoa) from marine fouling assemblages in the Galápagos Islands, Ecuador
A comprehensive survey of hydroids (Cnidaria, Hydrozoa) from marine fouling communities in the Galápagos Islands identified 20 species, including six anthoathecates and 14 leptothecates. Eight species were recorded for the first time in the archipelago, with three also being new to the eastern Pacific. The study highlighted eight introduced hydroid species, increasing the known count to eight, and reclassified four as cryptogenic, bringing the total to five. Notably, the species Obelia thornelyi was reassigned to the genus Clytia, and Dynamena distans was combined with the genus Amphisbetia. The research, based on samples collected in 2015 and 2016, also included a previously undocumented hydroid from a shipwreck near Isla San Cristóbal. This study contributes significantly to the understanding of hydroid biodiversity and biogeography in the Galápagos.
Insights into the evolutionary and demographic history of the extant endemic rodents of the Galápagos Islands
Research reveals that the extant endemic rodents of the Galápagos Islands originated from two distinct colonization events, with the ancestor of Nesoryzomys arriving during the Pliocene and Aegialomys during the middle Pleistocene. Phylogenetic analysis using mitochondrial DNA (mtDNA) D-loop region confirmed monophyly in all four surviving species: Aegialomys galapagoensis, Nesoryzomys narboroughi, N. swarthi, and N. fernandinae. The study also found that populations on each island exhibit high genetic diversity with signs of recent expansion, though conservation status requires further assessment. These findings suggest a complex evolutionary history for Galápagos rodents, emphasizing the need for ongoing monitoring and future research using genome-wide markers to deepen understanding of their origins and relationships.
Integrated Coastal Zone Management in Continental Ecuador and Galapagos Islands: Challenges and Opportunities in a Changing Tourism and Economic Context
Despite receiving international support for training and financing, Ecuador's integrated coastal zone management (ICZM) faces significant challenges due to economic and administrative instability. This study highlights that such discontinuities hinder the development of tourism and economic growth in coastal areas, including the Galápagos Islands. The research analyzed ten key elements—policies, regulations, institutions, strategies, instruments, information, education, resources, managers, and participation—to assess national coastal management. Findings suggest that while Ecuador has made progress, sustained efforts are needed to strengthen gastronomic and cultural aspects in new policies to overcome these obstacles.
Land Cover Classification of Complex Agroecosystems in the Non-Protected Highlands of the Galapagos Islands
Invasive plants dominate the agricultural landscape of the Galápagos Islands' non-protected highlands, covering 28.5% of the area—more than any other land cover type. This finding emerges from a high-resolution land cover classification study that combined PlanetScope and Sentinel-2 satellite imagery with UAV validation, achieving strong accuracy (overall Kappa: 0.7, R²: 0.69). The research reveals that pastures (22.3%), native vegetation (18.6%), food crops (18.3%), and mixed forest/pioneer plants (11.6%) follow in prevalence, reflecting historical colonization patterns. By leveraging object-based classification with a RandomForest algorithm, the study provides a baseline dataset to support both conservation efforts and agricultural practices, bridging gaps between these critical disciplines.
Mangroves in the Galapagos islands: Distribution and dynamics
Mangrove forests in the Galápagos Islands cover approximately 3,657 hectares, accounting for 35% of the coastline. A recent study revealed that 80% of this mangrove cover is concentrated on Isabela Island, with 90% located in the western and central south-eastern bioregions. The research utilized high-resolution Google Earth imagery to map mangroves, achieving a classification accuracy of 99.1% when validated against field data. On-screen digitization proved significantly more accurate than semi-automated methods, with Maximum Likelihood Classification yielding the best results among automated techniques. Between 2004 and 2014, mangrove coverage increased by 24%, primarily through the expansion of existing patches rather than the formation of new ones. The study also suggests that mangrove cover and growth may be inversely proportional to the geological age of the islands, though other factors such as nutrient availability, currents, and wave exposure could also influence this pattern.
Noneruptive Unrest at the Caldera of Alcedo Volcano (Galápagos Islands) Revealed by InSAR Data and Geodetic Modeling
A rare pattern of volcanic unrest at Alcedo Volcano, a mafic caldera in the Galápagos Islands, was documented through InSAR data and geodetic modeling. The study revealed episodic magma emplacement beneath the caldera, characterized by asymmetric uplift (up to 30 cm) followed by subsidence and lateral migration of magma, without culminating in an eruption. This behavior suggests a discontinuous deep magma supply and aligns with long-term geological observations of incremental caldera growth. The findings highlight the complex dynamics of non-eruptive volcanic unrest, offering insights into the processes shaping resurgent basaltic calderas.
Population dynamics of an invasive bird parasite, Philornis downsi (Diptera: Muscidae), in the Galapagos Islands
A study on the invasive parasitic fly, Philornis downsi, in the Galápagos Islands reveals that female flies can persist even when bird hosts are scarce, challenging previous assumptions about their population dynamics. The research, conducted between 2012 and 2014 at dry lowland and humid highland sites on Santa Cruz Island, found that female flies remained active year-round, with a significant proportion inseminated and gravid, indicating continuous breeding cycles. Male fly catch rates declined outside bird breeding seasons, suggesting host availability is a key regulator of their population. Overall, fly numbers were higher in drier habitats, potentially due to greater host or resource availability. The study also suggests that P. downsi populations are multivoltine and governed by simple density dependence, with female numbers likely regulated by the availability of bird nests with nestlings. These findings highlight the vulnerability of already threatened Galápagos bird species, which may be further exacerbated by unknown reservoir hosts or behavioral changes in the parasite.
Potential role of lava lizards as pollinators across the Galápagos Islands
Research reveals that Galápagos lava lizards (Microlophus spp.) may play a significant but modest role as pollinators across the archipelago. Over three years, 8.4% of 296 sampled lizards carried pollen from at least 10 plant species, including both native and non-introduced plants, across seven lizard species and eight islands. While less dominant than birds or insects, this interaction suggests ecological importance for specific plants and ecosystems, particularly given the islands' diverse climates and functional traits.
Psidium guajava in the Galapagos Islands: Population genetics and history of an invasive species
A genetic analysis of guava (Psidium guajava) populations in the Galápagos Islands reveals distinct genetic structures and historical introduction patterns. The study found that San Cristóbal and Isabela populations are genetically distinct, while Santa Cruz shows a mixture of both, suggesting multiple introductions or secondary spread from San Cristóbal to Isabela. Genetic bottlenecks indicate a likely initial introduction in San Cristóbal, with subsequent movements to other islands. This contrasts with historical records, providing new insights into the invasive species' dynamics and its impact on local biodiversity.
Socio-Ecological Factors Associated with Dengue Risk and Aedes aegypti Presence in the Galápagos Islands, Ecuador
Dengue fever has emerged as a significant health threat in the Galápagos Islands, with periodic outbreaks reported since 2002. A 2014 study identified key socio-ecological factors associated with dengue risk and the presence of its primary vector, Aedes aegypti, in Puerto Ayora (Santa Cruz Island) and Puerto Baquerizo Moreno (San Cristóbal Island). The research found that 24% of respondents in PB and 14% in PA reported prior dengue infections, with more Ae. aegypti presence in PB homes. Risk factors for dengue included human movement patterns, household demographics, water quality issues, and dengue awareness. Housing conditions, mosquito control practices, and risk perception were significant predictors of Ae. aegypti presence. This was the first comprehensive study of its kind in the Galápagos, providing critical insights for public health interventions.
The ecology and evolution of seed predation by Darwin's finches on Tribulus cistoides on the Galápagos Islands
Darwin's finches and the plant species Tribulus cistoides are engaged in an ongoing coevolutionary arms race, with finch seed predation significantly influencing both the ecology and evolution of the plant. The study reveals that seed survival in T. cistoides varies dramatically depending on finch community composition across islands and interannual precipitation fluctuations. Finch beak morphology imposes strong phenotypic selection on fruit traits, favoring smaller, harder fruits with longer or more spines. This selection pressure is further modulated by spatial variation in finch communities, suggesting a dynamic coevolutionary process shaped by both environmental and biotic factors.
An annotated checklist of the freshwater cladocerans (Crustacea: Branchiopoda: Cladocera) of Ecuador and the Galápagos Islands
A comprehensive annotated checklist identifies 34 valid species of freshwater cladocerans (Crustacea: Branchiopoda) from Ecuador and the Galápagos Islands, grouped into 23 genera. This compilation revises all published records, evaluates taxonomic validity, and provides biogeographical insights for each taxon. Despite this progress, current attempts to analyze distributional patterns remain premature due to insufficient data. The study highlights significant gaps in cladoceran taxonomy across Ecuador and offers recommendations for future research to address these deficiencies.
Bovine anaplasmosis and tick-borne pathogens in cattle of the Galapagos Islands
Research confirms the Galápagos Islands are endemic for Anaplasma marginale, with 100% between-herd prevalence and a median within-herd prevalence of 93%. The study, conducted across Santa Cruz, San Cristóbal, and Isabela islands, used PCR assays, genetic sequencing, and ELISA to detect A. marginale in cattle, while also identifying Rhipicephalus microplus ticks as carriers of additional pathogens, including Babesia bigemina, Borrelia theileri, and a Francisella-like endosymbiont. A significant association was found between A. marginale infection and cattle age, with adults showing higher odds (OR = 3.3) of infection compared to younger animals. The study highlights the widespread presence of tick-borne diseases in Galápagos cattle populations, posing risks to livestock health.
Digenetic trematodes of fishes from the Galapagos Islands and the neighboring Pacific
A comprehensive survey of digenetic trematodes in Galápagos fish populations revealed that 82 species of Digenea parasites were found across nearly 100 different host species, with approximately 43% of the 532 examined fishes harboring these parasites. This high prevalence underscores the rich parasitic diversity in the region's marine ecosystems. The study, conducted during the third Allan Hancock Expedition to the Galápagos Islands in 1934, employed a thorough examination of fish specimens, many of which were identified by experts at the U.S. National Museum. The findings contribute significantly to our understanding of parasite-host dynamics in this UNESCO World Heritage Site.
Emergent conservation conflicts in the Galapagos Islands: Human-giant tortoise interactions in the rural area of Santa Cruz Island
A growing conflict between human agricultural development and the conservation of Galapagos giant tortoises (Chelonoidis spp.) has emerged on Santa Cruz Island, threatening the species' recovery. Research reveals that farmers experiencing crop damage are more likely to take aggressive measures against tortoises, such as fencing or physical intervention, regardless of their overall perception of the animals. Economic losses for crops and fences average 2.8 USD per square meter and 13 USD per meter, respectively, highlighting significant financial impacts. The study also estimated tortoise densities at 76 individuals per km² during lowland migrations (January–June) and 185 per km² during highland migrations (July–December). Combining participatory rural appraisal methods with ecological transect counts, this work provides critical data to guide conservation strategies, offering a balanced approach to resolving human-wildlife conflicts in UNESCO World Heritage Sites.
Food supply system dynamics in the Galapagos Islands: agriculture, livestock and imports
A critical analysis of the Galápagos Islands' food supply system reveals that without intervention, 95% of agricultural food will be imported by 2037, up from 75% in 2017. This shift is driven by rapid population growth—fueled by tourism—and a decline in local agricultural production, which already lags behind mainland Ecuador's consumption levels. Using system dynamics modeling with secondary data, researchers projected future scenarios to highlight the unsustainable trajectory of food dependence. The study underscores the urgent need for policy reforms to bolster local agriculture and align tourism growth with sustainable subsistence strategies.
Galapagos Islands Endemic Vertebrates: A Population Genetics Perspective
Modern population genetics and genomics research has revealed that the Galápagos Islands, pivotal to Darwin's theory of evolution, exhibit diverse evolutionary pressures among six iconic vertebrate species. Strong selection drove diversification in Darwin's finches and flight adaptation loss in the flightless cormorant, with candidate genes identified. Genetic drift significantly impacted small populations like the pink iguana and Galápagos hawk, while interisland gene flow was evident in marine iguanas and some finch species. Hybridization introduced adaptive variation, potentially leading to despeciation. These findings highlight the complex interplay of evolutionary forces shaping Galápagos biodiversity.
Some monogenetic trematodes from the Galapagos Islands and the neighboring Pacific
This study describes twenty-two species of monogenetic trematodes, including twenty new species, collected from marine fish gills across the Galápagos Islands and neighboring Pacific regions. Notably, two new genera, Pseudomicrocotyle and Acanthocolpa, were proposed, with the former reclassifying Microcotyle acanthurum. The research also corrected MacCallum's measurements of Protomicrocotyle mirabile and expanded its genus description. Additionally, previously undescribed structures surrounding the genital pore in Acanthocolpa species were identified and named 'giant cells,' highlighting their taxonomic significance. The study underscores the specificity of trematode-host relationships, with each described species found on only one specific host despite examining over 500 fish from approximately 100 species.
Temperature Influences Herbivory and Algal Biomass in the Galápagos Islands
In the Galápagos Islands, temperature significantly influences herbivory and algal biomass, challenging the assumption that upwelling intensity alone controls macroalgal cover. Research reveals that grazing rates by urchins, fishes, turtles, and iguanas increase during warmer seasons, leading to reduced algal biomass when upwelling is weak. Conversely, strong upwelling with colder water can result in higher algal biomass despite increased herbivory. The study combined grazing assays, field surveys across ten sites over five years, and a herbivore exclusion experiment to demonstrate that temperature-driven changes in herbivore activity play a critical role in shaping subtidal ecosystems. This finding suggests that the relationship between upwelling and algal biomass is more complex than previously understood.
The politics of a natural laboratory: Claiming territory and governing life in the Galápagos Islands
The Galápagos Islands, often seen as a natural laboratory of evolution, have been shaped by the interplay of scientific research, conservation, and tourism over the past century. This study reveals that the metaphor of a 'natural laboratory' has not only influenced knowledge production but also underpinned global environmental governance and territorial management. It shows how foreign naturalists in the mid-twentieth century used this concept to establish the Galápagos National Park and Charles Darwin Research Station, employing biopolitical strategies to control human access and introduced species. However, the analysis demonstrates that this approach has been unsustainable, highlighting the complex interplay between scientific authority, conservation efforts, and governance in shaping the archipelago's future.
Towards Comprehensive Policy Integration for the Sustainability of Small Islands: A Landscape-Scale Planning Approach for the Galápagos Islands
Recent policy reforms in the Galápagos Islands have strengthened provincial governance and introduced landscape-scale planning, but significant gaps remain. The study reveals that while institutional arrangements now better address socio-ecological and land-sea management challenges, fragmented conservation-development approaches between local and provincial governments persist, alongside policy inconsistencies. These limitations hinder comprehensive policy integration—critical for achieving sustainable development in insular ecosystems. The research analyzed legal and planning documents to assess their support for integrated governance, highlighting the need for more cohesive, multi-level coordination to address pressing socio-ecological issues effectively.
Urban Land Cover Change in Ecologically Fragile Environments: The Case of the Galapagos Islands
A study on the Galápagos Islands reveals that object-based classification using spectral indices is more effective than sub-pixel spectral mixture analysis for mapping impervious surfaces in heterogeneous urban environments. This method, applied to the three main inhabited islands, showed a strong correlation (R² = 67.7%) between estimated and true impervious surface abundance, despite limitations from Landsat imagery's pixel size. The research found an average annual urban growth rate of 3.3% from 1992 to 2017, highlighting the need for integrated planning systems to balance conservation efforts with sustainable development in this ecologically fragile UNESCO World Heritage Site.
Alien species pathways to the Galapagos Islands, Ecuador
A comprehensive analysis of alien species pathways to the Galápagos Islands reveals that 1,579 terrestrial and marine species have been introduced by humans, with nearly all becoming established. The study identifies intentional introductions, primarily of plants, as a significant but declining threat due to strengthened biosecurity measures. However, unintentional introductions via plant material, transport vehicles, and commodities like fruit and vegetables pose an increasing risk, particularly as tourism expands. The research collated extensive data on human activity pathways, including tourist movements, cargo, and biosecurity interceptions, highlighting the close correlation between human population growth and the frequency of alien species arrivals. Effective management of these invasion pathways is critical to preserving the biodiversity of this unique UNESCO World Heritage Site.
Avian Pox Discovered in the Critically Endangered Waved Albatross (Phoebastria irrorata) from the Galápagos Islands, Ecuador
Researchers report the first documented case of avian pox in the critically endangered Waved Albatross (Phoebastria irrorata), the world's only tropical albatross, on Española Island in the Galápagos. Between November 2013 and January 2014, 14 nestlings exhibited pox-like lesions, with six succumbing to the disease. Histopathological analysis confirmed avipoxvirus infection via inclusion bodies in tissue samples. Unlike other seabirds and landbirds, which appeared unaffected, this outbreak highlights a significant threat to the species' survival, given its already declining population. The study underscores the urgent need for pathogen monitoring and conservation efforts to mitigate disease impacts on endemic taxa.
Conservation status of landbirds on Floreana: the smallest inhabited Galápagos Island
A comprehensive survey of landbirds on Floreana, the smallest inhabited island in the Galápagos, reveals alarming declines and extirpations among its avian species. Of the 22 originally occurring landbirds, at least 10 have been lost or likely extirpated since human settlement, primarily due to introduced mammals, habitat destruction, and direct persecution in the 19th century, as well as the parasitic fly Philornis downsi since 1960. While some species like Small Ground-Finches and Small Tree-Finches maintain stable populations comparable to other Galápagos islands, others such as Medium Tree-Finches are confined to a mere 24 km² in the highlands. The study underscores the urgent need for strategies to mitigate the impact of P. downsi, alongside habitat management and restoration, to preserve Floreana's remaining landbird populations.
Contribution by vertebrates to seed dispersal effectiveness in the Galápagos Islands: a community‐wide approach
In the Galápagos Islands, small non-finch passerine birds emerge as the most effective seed dispersers when considering both the quantity of seeds dispersed and their impact on seedling emergence. This study, which analyzed 16 vertebrate species dispersing 58 plant species across lowland and highland habitats, found contrasting patterns based on seed occurrence in droppings versus actual seed dispersal per unit area. While giant tortoises and medium-sized passerines were prominent in seed occurrence data, small non-finch passerines led in effective dispersal, followed by finches and medium-sized passerines. Gut passage effects varied significantly between dispersers and plant species, with medium-sized passerines like mockingbirds often outperforming lava lizards. The research highlights that quantitative measures of seed dispersal are stronger predictors of seed dispersal effectiveness (SDE) in the Galápagos archipelago.
Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
A study on the genetic diversity and population structure of two Galapagos tomato species, Solanum cheesmaniae and Solanum galapagense, reveals distinct evolutionary patterns linked to the islands' geological history. Analysis of 3,974 polymorphic SNP markers using Principal Component Analysis (PCA) and STRUCTURE identified clear genetic distinctions between the species, with S. cheesmaniae showing subdivision based on geographical origin and island age. The findings suggest that the movement of the Galapagos Islands from west to east influenced gene flow in S. cheesmaniae, while the absence of S. galapagense in eastern islands indicates post-isolation divergence. This research highlights the potential of these species for plant breeding, offering novel alleles contributing to stress tolerance.
Habitat filtering not dispersal limitation shapes oceanic island floras: species assembly of the Galápagos archipelago
Habitat filtering, not dispersal limitation, primarily shapes the species composition of oceanic island floras, including those in the Galápagos archipelago. This counterintuitive finding emerges from a comprehensive analysis of ~39,000 plant species, their phylogeny, dispersal strategies, and climatic suitability. The study suggests that only a subset of continental species, with specific niche requirements, can establish themselves on remote islands, which may explain the prevalence of adaptive radiation in such environments. This challenges the long-held assumption that dispersal limitation is the dominant factor in species assembly on oceanic islands.
Host‐specific associations affect the microbiome of Philornis downsi, an introduced parasite to the Galápagos Islands
A significant difference in the microbiome of the invasive parasitic fly Philornis downsi was found between larvae and adults, with Proteobacteria and Firmicutes dominating both stages but showing distinct distributions. The study also revealed that larval microbiomes vary based on host species, particularly between insectivorous warbler finches (Certhidea olivacea) and those with broader diets (ground and tree finches). No spatial effects were observed, as larvae from the same host group exhibited similar microbiomes across islands. These findings suggest that the parasite's microbiome adapts to dietary needs during development and is influenced by host-related factors, offering potential insights for novel disease control strategies.
Past, current, and future trends of red spiny lobster based on PCA with MaxEnt model in Galapagos Islands, Ecuador
A novel approach integrating principal component analysis (PCA) with maximum entropy (MaxEnt) modeling significantly enhances the accuracy and predictive power for assessing the potential distribution of red spiny lobster in the Galápagos Islands. The study demonstrates that using PCA-transformed environmental variables as inputs for MaxEnt models outperforms raw data, achieving better area under the curve (AUC) and partial receiver operating characteristic (pROC) metrics. This method was applied to historical data from 1997 to 2015 and projected future scenarios up to 2070, revealing critical insights into habitat suitability. Future climate change scenarios suggest potential shifts in suitable habitats, underscoring the need for adaptive management strategies to conserve this valuable species. The findings highlight the effectiveness of PCA-MaxEnt integration as a robust tool for ecological modeling and conservation planning.
Tangles of Care: Killing Goats to Save Tortoises on the Galápagos Islands
A large-scale mammal eradication campaign on the Galápagos Islands, involving the culling of over 200,000 goats to protect endangered tortoises, revealed that conservation efforts can be ethically complex and contentious. While aimed at saving endemic species, the intervention sparked debates among residents about competing forms of care for nonhuman animals. The study highlights the biological, ecological, and political implications of such actions, challenging the binary logic of success or failure in conservation. It advocates for a more nuanced approach to multispecies coexistence in the Anthropocene.
The distribution of mosquitoes across an altitudinal gradient in the Galapagos Islands
Mosquito populations in the Galápagos Islands decline significantly with elevation, challenging the existence of stable highland refuges for disease vectors. Research sampling three mosquito species—Aedes taeniorhynchus, Culex quinquefasciatus, and Aedes aegypti—across altitudinal gradients on Isabela and Santa Cruz islands from 2012 to 2014 found that while the first two species were widespread, their abundances varied by island and year. Ae. aegypti was rare and confined to human-inhabited areas. Statistical models confirmed altitude, year, trap type, and human inhabitation as key factors influencing mosquito distributions. These findings suggest that even high-altitude regions may not serve as consistent refuges for disease vectors like avian malaria, necessitating further research on vector potential and disease dynamics in the Galápagos.
Balancing tourism, conservation, and development: a political ecology of ecotourism on the Galapagos Islands
Ecotourism on the Galápagos Islands, while promoting conservation and tourism, has significantly altered local communities' perceptions of agency and governance. A six-week field study on San Cristóbal Island revealed that residents face complex power dynamics where conservation efforts and tourism intersect with development, often at the expense of their political agency. The municipal government aims to implement 'true' ecotourism, which could empower locals, but this ideal is hindered by a lack of transparency and support from Ecuadorian governance. This research highlights the asymmetrical power relations in protected areas, demonstrating how conservation, tourism, and development reshape local lives and perceptions.
Interactions of social, terrestrial, and marine sub-systems in the Galapagos Islands, Ecuador
The Galápagos Islands face growing tensions between conservation and economic development, particularly due to tourism pressures that threaten unique species, terrestrial landscapes, and marine environments. This study uses dynamic systems models and agent-based models to analyze human-environment interactions, rooted in complexity theory. It identifies key relationships and processes linking social and ecological systems, revealing how political policies shape human responses—often with detrimental effects on sustainability. The research formalizes knowledge of coupled human-natural systems through statistical and theoretical functions, offering practical insights for policymaking.
Largest global shark biomass found in the northern Galápagos Islands of Darwin and Wolf
Research conducted at the northern Galápagos Islands of Darwin and Wolf reveals the largest global shark biomass ever recorded, averaging 17.5 tons per survey site. This remarkable finding underscores the ecological significance of these islands within the Galápagos Marine Reserve (GMR), where sharks dominate reef fish communities despite severe depletion elsewhere due to unsustainable fishing practices. Stereo-video surveys over two consecutive years provided quantitative estimates of fish abundance, highlighting the unique biodiversity and conservation value of Darwin and Wolf. Although historically unprotected from fishing until 2016, their current status offers hope for long-term preservation, benefiting both ecological integrity and the region's economically vital dive tourism industry.
Life Cycle and Host Specificity of the Parasitoid Conura annulifera (Hymenoptera: Chalcididae), a Potential Biological Control Agent of Philornis downsi (Diptera: Muscidae) in the Galápagos Islands
Research identifies Conura annulifera as a potential biological control agent for Philornis downsi, an invasive fly threatening Darwin's finches in the Galápagos Islands. The study reveals that C. annulifera is a solitary pupal ectoparasitoid with high host specificity, successfully reproducing only when exposed to P. downsi pupae and causing developmental mortality in hosts beyond successful parasitism. Field collections from Ecuador and laboratory experiments demonstrated its narrow host range, including no progeny production on non-target dipteran, lepidopteran, or hymenopteran species. This first record of C. annulifera in Ecuador provides foundational data for evaluating its efficacy as a biocontrol agent to mitigate the ecological impact of P. downsi on vulnerable finch populations.
Management of Urban Wastewater on One of the Galapagos Islands
A modular, low-maintenance wastewater management system is proposed for Puerto Ayora, Santa Cruz Island, to address the growing environmental and health risks posed by inadequately treated sewage. The study highlights the urgent need for sustainable solutions in UNESCO-listed Galápagos Islands, where lava rock terrain limits deep excavation and remote location demands on-site maintainable technologies. The approach integrates Ecuadorian legislation, Millennium Development Goals, and PAHO guidelines, offering a replicable model for developing regions. Challenges include slow implementation due to technical difficulties, but the proposed system aims to balance tourism growth with ecosystem preservation.
Reconsidering Precolumbian Human Colonization in the Galápagos Islands, Republic of Ecuador
A comprehensive re-evaluation of archaeological evidence from the Galápagos Islands challenges the long-held belief that precolumbian humans occupied the archipelago. By re-excavating five sites initially studied by Heyerdahl and Skjølsvold in 1956, researchers found that all artifacts—regardless of age or origin—were distributed uniformly, contradicting the assumption of multiple, unrelated occupations. Optically-stimulated luminescence dating of putatively precolumbian pottery revealed most were of historical age, while radiocarbon dating confirmed that the sites postdate the 16th century. Sedimentary core analysis further indicated anthropogenic impacts limited to the last 500 years. The study concludes that there was no human occupation in the Galápagos Islands before the historical era.
Scenario planning for tourism management: a participatory and system dynamics model applied to the Galapagos Islands of Ecuador
A participatory system dynamics model reveals that unchecked tourism growth and residential population expansion in the Galápagos Islands severely shock the natural environment, particularly by increasing invasive species threats and saturating the Galapagos National Park's tourism reception capacity. The study integrates stakeholder perspectives with quantitative data to simulate three tourism growth scenarios, demonstrating critical social-ecological feedbacks that could disrupt the islands' unique ecosystem. This decision-support tool offers policy-makers a way to better understand and manage the coupled human-natural system, ensuring sustainable conservation outcomes.
UAV Monitoring for Enviromental Management in Galapagos Islands
UAV technology proves highly effective for monitoring littoral vegetation degradation in the Galápagos Islands, offering timely and accurate data crucial for environmental management. The study demonstrates that UAV-captured RGB and NIR images can systematically identify vegetation presence through NDVI and characterize plant vigor via object-based classification. This approach provides a robust tool for baseline studies and ongoing monitoring, addressing critical gaps in the region's ability to respond to threats like invasive species spread and habitat degradation. By enabling rapid data collection and thematic information production, UAVs enhance decision-making for protected areas where ecosystem dynamics are particularly vulnerable.
Data assessment for water demand and supply balance on the island of Santa Cruz (Galápagos Islands)
A high per capita water demand of approximately 370 liters per day (lpcpd) has been identified on Santa Cruz Island, the most populated of the Galápagos Islands, despite its water-scarce environment. This finding stems from a data assessment study that analyzed total water supply and demand, highlighting significant pressure on local resources due to rapid population growth and tourism expansion. The research compared two main urban settlements and evaluated constraints faced by the Municipal Department of Potable Water and Sanitation. By quantifying water sources and their contributions, the study provides critical insights for developing a comprehensive water balance, essential for ensuring reliable and continuous safe drinking water supply in the region.
Distribution of Thelastomatoid Nematodes (Nematoda: Oxyurida) in Endemic and Introduced Cockroaches on the Galápagos Island Archipelago, Ecuador
A survey of thelastomatoid pinworm fauna in endemic and introduced cockroach species on the Galápagos Islands revealed eight distinct pinworm species, with low prevalence rates across seven islands. The study identified five new host records for Cephalobellus ovumglutinosus, including in endemic cockroaches like Chorisoneura carpenteri and Ischnoptera snodgrassii. While some introduced pinworm species were found in endemic hosts, others globally widespread species were absent. The research suggests a complex distribution pattern influenced by invasive host introductions, with Santa Cruz Island hosting the greatest diversity of pinworms. This first-of-its-kind survey in the region provides insights into invertebrate dispersal and speciation in an evolutionary-rich ecosystem.
Equilibrium and non‐equilibrium dynamics simultaneously operate in the Galápagos islands
Avian diversity in the Galápagos Islands is not at equilibrium but continues to rise, challenging long-held assumptions about insular biotas. Unlike most terrestrial birds, which diversify slowly without ecological constraints, Darwin's finches rapidly reach a carrying capacity and follow a coalescent-like diversification process. This dual dynamic—simultaneous operation of both non-equilibrium (ascending diversity) and equilibrium (carrying capacity) processes—was revealed using a novel phylogenetic method that estimates biota assembly rates for entire communities. The findings suggest remote islands like the Galápagos may experience persistent biodiversity increases, complicating traditional ecological paradigms.
Evolving Marine Biosecurity in the Galapagos Islands
A significant shift in marine biosecurity practices is underway in the Galápagos Islands, with new protocols aimed at preventing the introduction and spread of invasive species. The study highlights the implementation of stricter measures, including enhanced screening of vessels and cargo, to protect the unique marine ecosystems of this UNESCO World Heritage Site. Researchers analyzed existing biosecurity frameworks and identified gaps, proposing targeted interventions such as improved training for port authorities and standardized inspection procedures. These efforts are critical in safeguarding the Galápagos' biodiversity, which is particularly vulnerable due to its isolation and delicate balance of native species.
Philornis downsi (Diptera: Muscidae), an Avian Nest Parasite Invasive to the Galapagos Islands, in Mainland Ecuador
A recent study reveals that the avian nest parasite Philornis downsi, native to mainland South America, has extended its invasive reach to the Galápagos Islands, where it targets Darwin’s finches and other land birds. The research identifies mainland Ecuador as a potential route for this invasion, based on the first documented presence of P. downsi in the region. Analyzing 20% of nests in 2013 and 27% in 2014 from western Ecuador, scientists found that P. downsi accounted for 74% (2013) and 40% (2014) of dipteran puparia, with lower parasitism rates than those observed in the Galápagos. Additionally, two new bird hosts—streak-headed woodcreeper and fasciated wren—were recorded for the genus Philornis. The study also documents a parasitoid wasp (Brachymeria) preying on P. downsi puparia, with emergence holes noted in 9% (2013) and 19% (2014) of samples. This research underscores the ecological impact of invasive species and highlights the need for monitoring to mitigate threats to native bird populations.
Somatic Growth Rates of Green Turtles (Chelonia mydas) and Hawksbills (Eretmochelys imbricata) in the Galápagos Islands
A study of Galápagos green turtles (Chelonia mydas) and hawksbills (Eretmochelys imbricata) reveals persistently slow growth rates, with estimates suggesting 133–200 years for green turtles to reach sexual maturity from a carapace length of 40 cm. This research, conducted between 2003 and 2008 at four key foraging sites in the Galápagos Islands, confirms that growth is significantly influenced by color morph, body size, and spatial variation, mirroring findings from a late-1970s study. The study also provides novel data on hawksbill growth rates, marking the first such information for this species in the archipelago. By analyzing recapture intervals, body measurements, and site-specific factors, researchers established a baseline to assess habitat quality changes over time.
Water quality and antibiotic resistance at beaches of the Galápagos Islands
A study on the Galápagos Islands revealed that sewage discharge significantly increases Enterococcus concentrations and antibiotic-resistant Escherichia coli levels at beaches, often exceeding international recreational water quality guidelines. This suggests human activities are contributing to the environmental resistome, a finding with potential global implications where tourists frequently use antibiotics. The research compared five beaches on Isla San Cristóbal, some affected by sewage discharge, using IDEXX Enterolert® for Enterococcus quantification and membrane filtration for antibiotic resistance testing in E. coli isolates.
Border Crossings: New Geographies of Protection and Production in the Galápagos Islands
A shift in conservation management is emerging in the Galápagos Islands, challenging the long-standing 'fortress' model that separated natural and human spaces. This study reveals how ecological, political, and economic crises have transformed the Galápagos National Park (GNP) border from a fixed boundary of protection to a dynamic site of encounters. By applying insights from border studies and hybrid conservation approaches, researchers trace discursive and material exchanges across the GNP border, demonstrating its potential to reshape conservation theory and practice. The findings highlight borders as transformative spaces rather than mere technologies for spatial fixation, offering new geographies that integrate protection with production.
Comparative Ectoparasite Loads of Five Seabird Species in the Galapagos Islands
A comparative analysis of ectoparasitic lice infesting five seabird species in the Galápagos Islands revealed that inter-island differences were the primary predictors of parasite prevalence and infestation intensity. The study identified nine species of lice, including shared and host-specific varieties across magnificent frigatebirds, great frigatebirds, Nazca boobies, blue-footed boobies, and red-footed boobies. While factors such as host sex, body size, breeding status, and family were examined, island-specific variations emerged as the dominant influence on parasite loads. These findings suggest potential links to host density or environmental conditions, though further research is needed to clarify these relationships.
Darwin's fishes: phylogeography of Galápagos Islands reef fishes
Research on Galápagos reef fishes reveals no clear correlation between species distribution types (endemic, insular, or Panamic) and genetic population structure, challenging assumptions about allopatric speciation patterns in marine systems. The study used population structure and coalescent approaches to analyze 12 species with diverse life histories across the archipelago and neighboring islands. While terrestrial Galápagos species are well-studied for speciation processes, this work tests whether similar dynamics apply to reef fishes. Findings suggest limited inter-island genetic diversity in endemic species, implying that marine allopatric speciation may differ significantly from terrestrial patterns. The research contributes to understanding biogeographic processes shaping marine biodiversity in the Galápagos.
Exploring the combined role of eustasy and oceanic island thermal subsidence in shaping biodiversity on the Galápagos
A significant shift in the understanding of biodiversity patterns on the Galápagos Islands has been revealed through high-resolution palaeogeographical models, which demonstrate that rapid changes in relative sea levels—driven by eustasy and thermal subsidence—have dramatically altered island connectivity over the past 700,000 years. These fluctuations, characterized by periods of extreme lowstands (–140 to –210 m) every ~90,000 years, caused large islands to coalesce, providing land-locked vertebrates with access to vast new territories. Analysis of biological data for groups such as racer snakes, lava lizards, and land iguanas suggests that these geographic upheavals left detectable imprints on their biogeographical distributions. The study proposes that oscillating sea levels may serve as a mechanism to explain evolutionary patterns not only in the Galápagos but also in other island chains like the Maldives, Canaries, and Cape Verde.
Management of Municipal Solid Waste in One of the Galapagos Islands
A case study on the Galápagos Islands reveals that effective municipal solid waste management is achievable even in remote, ecologically sensitive regions with high tourism activity. The research highlights the importance of integrating tourism-related waste generation into sustainable management strategies, particularly in areas adjacent to protected national parks. By analyzing waste streams and implementing targeted interventions, this study demonstrates how decision-makers can optimize waste sector organization in similar contexts. The findings underscore the need for adaptive policies that balance ecological preservation with the demands of tourism, offering a replicable model for other UNESCO World Heritage Sites facing comparable challenges.
Modelling Tourism in the Galapagos Islands: An Agent-Based Model Approach
An agent-based model (ABM) successfully replicates real-world tourism dynamics in the Galápagos Islands, offering insights into how environmental changes could reshape the archipelago's touristic market. The model simulates tourist behavior and accommodation offers, aligning closely with field survey data. Preliminary simulations revealed emergent patterns that could guide policy decisions, demonstrating the ABM's potential as a tool for predicting tourism impacts on social-ecological systems.
Plant colonization across the Galápagos Islands: success of the sea dispersal syndrome
Species with sea-drifting diaspores are significantly more successful at colonizing multiple islands within the Galápagos archipelago, contrary to expectations. This finding emerges from a novel analysis of 289 lowland plant species across 12 islands, combining floristic and syndrome trait assessments. Researchers inferred colonization events and categorized dispersal syndromes (sea, wind, animal interior, or exterior) to evaluate their association with island distribution success. Surprisingly, while most species lacked specialized dispersal traits, those with sea-dispersal adaptations exhibited the broadest distributions. The study challenges the assumption of a net loss in dispersability from non-endemic to endemic species, providing critical insights into plant colonization dynamics in oceanic archipelagos.
The demise of Darwin's fishes: evidence of fishing down and illegal shark finning in the Galápagos Islands
A significant decline in high trophic level fish species, particularly groupers, has been observed in the Galápagos Islands over the past three decades. This phenomenon, known as 'fishing down,' has been replaced by planktivorous mullets due to intense fishing pressure closer to shore. The study analyzed total landings from 1950 to 2010, revealing that industrially caught tuna accounted for 80% of the 797,000 tons of seafood extracted during this period. Additionally, illegal shark finning remains a persistent issue despite conservation efforts, highlighting ongoing threats to the marine ecosystem. The research compiled and analyzed cumulative catch statistics, providing a comprehensive assessment of fishing impacts on Galápagos fisheries.
An annotated checklist of parasitic lice (Insecta: Phthiraptera) from the Galápagos Islands
A comprehensive annotated checklist identifies 104 species and subspecies of parasitic lice from the Galápagos Islands, including 26 new species records and eight new genus records. The study reveals 17 endemic species (16 bird-associated, one mammal), 79 native species, and eight introduced by humans, while correcting nine misassigned species in prior literature. It also documents 17 new host-louse associations, providing detailed taxonomic histories, distributions, and biogeographical statuses for each valid species. Additionally, the research designates four lectotypes from the Kellogg Collection, contributing significantly to the understanding of louse biodiversity and host-parasite dynamics in this UNESCO World Heritage Site.
Building Negotiated Agreement: The Emergence of Community-Based Tourism in Floreana (Galápagos Islands)
Community-Based Tourism (CBT) in Floreana, Galápagos Islands, emerges as a quasi-experimental model for reconciling tourism development with social and environmental goals. The study reveals that CBT's effectiveness hinges on multi-level governance coherence, the interdependence of regional and local dynamics, and the alignment of diverse actor worldviews with intended outcomes. Using ethnographic fieldwork and discourse analysis within the Institutional Analysis and Development (IAD) framework, researchers identified key elements critical to implementing CBT successfully. This approach offers a blueprint for participatory tourism management that balances economic, social, and ecological objectives in protected areas like UNESCO World Heritage Sites.
Differences in insect resistance between tomato species endemic to the Galapagos Islands
Research on tomato species endemic to the Galápagos Islands reveals that Solanum galapagense exhibits resistance to the phloem-feeding whitefly Bemisia tabaci, likely due to high levels of acyl sugars and specific glandular trichomes. This resistance was not observed in S. cheesmaniae, suggesting that these two species may represent morphotypes rather than distinct biological species. Genetic analysis using SNP markers failed to differentiate between the two, further supporting their potential classification as a single species shaped by selective pressures. The study used no-choice experiments with 35 tomato accessions and analyzed climatic, geographical, and molecular data to explore this hypothesis.
Hatching and emergence success in green turtle Chelonia mydas nests in the Galápagos Islands
Green turtle hatching and emergence success in the Galápagos Islands, a critical rookery in the eastern Pacific, averages 45.6%, significantly lower than global norms. Predation by feral pigs and beetles, along with nest destruction by nesting females, are primary causes of embryo mortality. The study, analyzing 1039 nests across four beaches, found significant variation in success linked to beach location, year, oviposition timing, and habitat. These findings underscore the urgent need for enhanced conservation measures, particularly feral pig control near Isabela beaches, to protect this endangered species and its habitats.
Invaders of pollination networks in the Galápagos Islands: emergence of novel communities
Alien species, particularly insects, are significantly reshaping pollination networks in the Galápagos Islands, increasing network stability while potentially introducing vulnerabilities. The study found that 20% of species (60 plants and 220 pollinators) were aliens, involved in 38% of interactions, with alien insects like dipterans, hymenopterans, and lepidopterans forming more links than native or non-endemic species. These invaders acted as 'island hubs,' infiltrated all network modules, and accounted for 38% of connectors, enhancing network cohesiveness. While this may increase resistance to species loss, it could also heighten susceptibility to diseases. The research analyzed data from five Galápagos islands, revealing profound structural changes in pollination networks due to invasions.
Multiple Lineages of Avian Malaria Parasites ( Plasmodium ) in the Galapagos Islands and Evidence for Arrival via Migratory Birds
A comprehensive screen of Galápagos birds revealed multiple lineages of avian malaria parasites (Plasmodium), with one lineage established across the archipelago while others appeared transient. Notably, two ephemeral lineages matched those found in migratory Bobolinks, suggesting a potential pathway for pathogen introduction via bird migration. The study combined molecular and microscopy techniques to analyze 3,726 endemic birds, uncovering that Galápagos birds may act as dead-end hosts due to the absence of gametocytes. These findings highlight the need for conservation strategies focused on mitigating introduced diseases, particularly those arriving through migratory species.
Simple criteria to determine detachment point of towed satellite tags provide first evidence of return migrations of whale sharks (Rhincodon typus) at the Galapagos Islands, Ecuador
Researchers have uncovered the first evidence of return migrations in whale sharks (Rhincodon typus) at the Galápagos Islands, Ecuador. By analyzing data from towed satellite tags attached to three large female whale sharks, scientists developed criteria to distinguish between tracks of attached and detached tags. One shark was tracked for an unprecedented 167 days, traveling 1,650 km west before returning to Darwin Island, demonstrating a homing migration behavior. The study also found that two other sharks returned to the same site. The research utilized SPOT-5 and SPLASH satellite tags, comparing their tracks with those of floating tags released at the same location. Key indicators for tag detachment included changes in daily transmission timing, location quality, and consistency with surface temperature or depth records. This discovery sheds light on the migratory patterns of whale sharks, a species listed as vulnerable by the IUCN.
Social Dimensions of ′Nature at Risk′ in the Galápagos Islands, Ecuador
Despite broad consensus on the environmental crisis threatening the Galápagos Islands, differing interpretations of its causes and solutions among residents hinder effective management. This study reveals how individual experiences and beliefs shape perceptions of ecological challenges, complicating efforts to address overpopulation and poor governance. Using qualitative research conducted between 2007 and 2011, the authors demonstrate that while facts about the crisis are widely agreed upon, their meanings vary significantly—leading to confrontational dynamics that persist today. The findings underscore the need for inclusive approaches that account for diverse social perspectives in conservation strategies.
Structure of ocean circulation between the Galápagos Islands and Ecuador
A significant oceanographic discovery reveals strong cross-hemisphere exchange between the Galápagos Islands and Ecuador, characterized by a robust northeastward surface current transporting 7–11 Sv at depths of 200 m. Underlying this surface flow, a southward undercurrent with a transport of 7–8 Sv was observed, extending up to 600 m deep and 100 km wide. Near the Ecuador coast, the shallow Ecuador Coastal Current extended offshore by 100 km, with peak velocities near 0.33 m/s at the surface, transitioning into the Peru-Chile Countercurrent. The study, conducted using vessel-mounted ADCP measurements from March to April 2009, confirmed these findings through observed sea level differences and their correlation with large-scale climate indices like Niño3 and the Southern Oscillation Index. Notably, more than half of the sea level variability remained unexplained, suggesting complex underlying dynamics.
Using numerical modeling to explore the origin of intrusion patterns on Fernandina volcano, Galapagos Islands, Ecuador
Numerical modeling reveals that the intrusion patterns observed on Fernandina volcano, Galápagos Islands, arise from minor variations in magma reservoir geometry. Inflation of a mildly oblate reservoir can trigger either radial or circumferential intrusions, while more oblate reservoirs produce gently dipping radial dikes through lateral sill injection and stress rotation—consistent with recent InSAR data. These findings bridge petrological and surface displacement data, offering a unified explanation for near-surface intrusion configurations.
Host selection and parasite infection in Aedes taeniorhynchus, endemic disease vector in the Galápagos Islands
Research on the black salt-marsh mosquito (Aedes taeniorhynchus) in the Galápagos Islands reveals that this endemic species, while primarily feeding on mammals and reptiles, may also play a role in maintaining avian vector-borne pathogens. Blood-meal analysis and PCR-based parasite screening identified filarial worms and Haemoproteus parasites, suggesting rare but significant bird-feeding events. Additionally, three distinct Hepatozoon DNA sequences were isolated from mosquitoes and iguanas, indicating multiple parasite species in the archipelago. Phylogenetic analysis suggests that A. taeniorhynchus may have facilitated a recent breakdown in host-species associations of these parasites, altering their evolutionary dynamics.
Impacts of climate variability and human colonization on the vegetation of the Galápagos Islands
A 2690-year fossil pollen record from the Galápagos Islands reveals that vegetation changes were primarily driven by shifts in species abundance rather than immigration or extinction, with droughts during the Medieval Climate Anomaly inducing rapid but reversible ecological shifts. Human colonization significantly altered the ecosystem, leading to the decline of native species like Alternanthera and Acalypha before 1930 and their potential local extinction due to intensified animal husbandry. Post-1970 reductions in grazing animals did not restore the native flora but instead facilitated exotic species invasions, accelerating habitat change beyond historical variability. The study also suggests increased lowland pollen transport to uplands, consistent with warmer wet seasons and intensified convection.
Nectar Production by InvasiveLantana camaraand EndemicL. peduncularisin the Galápagos Islands
Invasive Lantana camara outproduces the endemic L. peduncularis in nectar volume and sugar content across elevational gradients, suggesting a competitive advantage for pollinators in the Galápagos Islands. While L. camara consistently produced more nectar, L. peduncularis exhibited higher sugar concentration at lower elevations, hinting at divergent drought-adaptation strategies. Flower exclusion experiments revealed that nocturnal lepidopteran visitors significantly reduced nectar production in L. camara, though sugar concentration remained stable. These findings imply potential competition between invasive and endemic Lantana species for shared pollinators, with implications for ecosystem dynamics.
Panmixia supports divergence with gene flow in Darwin’s small ground finch, Geospiza fuliginosa, on Santa Cruz, Galápagos Islands
Research on Darwin's small ground finch, Geospiza fuliginosa, on Santa Cruz Island reveals that despite ecological and geographical differences between arid and humid zones, the species exhibits panmixia—a single genetically homogeneous population. This finding challenges expectations of strong adaptive divergence due to disruptive selection during low rainfall periods. Using microsatellite allele frequency data from 21 sites across four ecological zones, scientists rejected hypotheses of population substructure linked to ecological or geographical differences. The study suggests that high gene flow within the island supports selection over genetic drift as a driver for phenotypic divergence. These insights imply that classic adaptation, phenotypic plasticity, habitat choice, or combinations thereof may explain observed trait variation without requiring distinct populations.
Possible Impacts of the Invasive Plant Rubus niveus on the Native Vegetation of the Scalesia Forest in the Galapagos Islands
Rubus niveus, an invasive plant from Asia, significantly threatens the native Scalesia forest in Santa Cruz Island, Galápagos. Research found that areas with 60% or more cover of R. niveus exhibit drastically reduced native species richness and altered vegetation structure, suggesting this is a critical threshold for ecological impact. The study used correlation analysis to link R. niveus cover gradients with biotic (native plant diversity) and abiotic factors (light, soil properties). These findings propose that limiting R. niveus to 40% cover could help preserve the integrity of native ecosystems, offering a practical target for conservation efforts.
Recharge and source‐water insights from the Galapagos Islands using noble gases and stable isotopes
A novel approach using noble gases and stable isotopes reveals distinct recharge patterns in the Galápagos Islands' fractured basaltic aquifers. The study, conducted on Santa Cruz and San Cristóbal islands, demonstrates that low-altitude springs (<420 m) and basal aquifer samples are primarily recharged during the hot season, while high-altitude springs (>420 m) show recharge from both the garúa (cooler) and hot seasons. Noble gas temperatures (NGTs) and stable isotopes independently corroborate these findings, with young water ages further supporting seasonal recharge preservation. High-altitude samples exhibit systematic deviations in dissolved noble gases, challenging conventional degassing models. The study proposes that mixing of high-altitude rainwater (≥1500 m) with low-altitude fog droplets (~400 m) during the garúa season could explain these patterns, offering new insights into groundwater dynamics in volcanic island environments.
Space‐geodetic evidence for multiple magma reservoirs and subvolcanic lateral intrusions at Fernandina Volcano, Galápagos Islands
Research using InSAR data reveals Fernandina Volcano, Galápagos Islands, possesses multiple magma reservoirs and subvolcanic lateral intrusions. The study identifies two persistent magma storage zones beneath the summit and southern flank: a flat-topped reservoir at approximately 1.1 km below sea level and an oblate-spheroid cavity at around 4.9 km below sea level, both hydraulically connected. Additionally, it provides the first geodetic evidence for lateral intrusions in December 2006 and August 2007, potentially explaining historical volcanic events like the 1927 uplift at Punta Espinoza and the 1968 caldera collapse without significant eruption. The findings align with previous geodetic and petrological studies.
The post-political ecology of protected areas: nature, social justice and political conflicts in the Galápagos Islands
Conservation efforts in the Galápagos Islands, while driven by scientific imperatives and moral urgencies, often suppress political debate, creating a 'post-political' condition that marginalizes social justice concerns. This study reveals how alliances between conservation science, state authorities, and tourism industries have shaped the archipelago's governance, leading to violent conflicts in the 1990s. These clashes prompted reforms toward sustainability, yet persistent tensions highlight the challenges of balancing environmental protection with equitable outcomes. The research employs political ecology frameworks to analyze these dynamics, offering insights into the broader struggles of reconciling biodiversity conservation with social justice in protected areas.
Understanding Science in Conservation: A Q Method Approach on the Galápagos Islands
A Q method analysis of the Galápagos Islands revealed four distinct perspectives on the role of science in conservation, highlighting divergent understandings and priorities among scientists and managers. These perspectives—labeled 'Science for management,' 'Freedom of science,' 'Limits of science,' and 'Separation of science and conservation'—expose subjective values and assumptions that shape conservation practices. The study underscores the complexity of interdisciplinary collaboration in conservation, with potential implications for improving communication and addressing conflicts in UNESCO World Heritage Sites like the Galápagos.
110 Years of Avipoxvirus in the Galapagos Islands
Avipoxvirus, a disease introduced to the Galápagos Islands in the late 1890s, has been identified as a significant threat to endemic passerine birds, including finches and mockingbirds. This study analyzed 3,973 bird specimens collected between 1891 and 1906, revealing cutaneous lesions consistent with Avipoxvirus in 226 specimens (6.3%), with 21 of 59 tissue samples testing positive for the virus. The disease showed a nonrandom distribution, predominantly affecting islands inhabited by humans at the time of collection, suggesting human-mediated dispersal. Viral genotyping confirmed that 11 positive specimens matched contemporary canarypox variants, indicating the virus's long-term presence and ongoing impact on Galápagos bird populations.
Archipelago-Wide Island Restoration in the Galápagos Islands: Reducing Costs of Invasive Mammal Eradication Programs and Reinvasion Risk
Eradicating invasive species from entire archipelagos, not just individual islands, significantly reduces the risk of reinvasion and lowers costs. This approach is demonstrated by the Galápagos Islands' efforts to remove feral goats, which involved removing over 140,000 goats from more than 500,000 hectares at a cost of US$10.5 million. The study highlights that bureaucratic processes, financing, political will, and stakeholder approval are now the primary challenges rather than island size. Complementing this technical approach with long-term social strategies focused on education and governance can further mitigate reinvasion risks and enhance biodiversity benefits.
Characterization of Salmonella Occurring at High Prevalence in a Population of the Land Iguana Conolophus subcristatus in Galápagos Islands, Ecuador
A high prevalence (98.4%) of Salmonella was found in a population of land iguanas, Conolophus subcristatus, on the Galápagos Islands, with 14 different serovars identified among four subspecies. Predominant serovars included S. Poona, S. Pomona, S. Abaetetuba, and S. Newport, with genetic analysis revealing varying degrees of relatedness. All isolates were pan-susceptible to antimicrobials, suggesting a natural interaction between the pathogen and the host, potentially established before exposure to environmental factors influenced by antimicrobial use. The study utilized cloacal swabs from 63 iguanas on Santa Cruz Island, employing serotyping and pulsed field gel electrophoresis (PFGE) for characterization.
Colonization of the Galápagos Islands by plants with no specific syndromes for long‐distance dispersal: a new perspective
A groundbreaking study challenges the long-held assumption that plant colonization of isolated islands requires specific dispersal syndromes. Analyzing 251 native genera (509 angiosperm species) in the Galápagos Islands, researchers found that 36% of successful colonists—including many dry-fruit-bearing plants—lacked specialized traits for animal, wind, or water dispersal. This suggests that unpredictable long-distance dispersal mechanisms, previously overlooked, played a significant role in island colonization. The study combines floristic data, diaspore traits, phylogenetic corrections, and palaeobotanical records to infer 372 colonization events, with proportions of dispersal syndromes remaining consistent even when excluding human-mediated introductions.
Comparison of Blood Values and Health Status of Floreana Mockingbirds (Mimus Trifasciatus) on the Islands of Champion and Gardner-by-Floreana, Galápagos Islands
Floreana Mockingbirds (Mimus trifasciatus) on Gardner-by-Floreana exhibit significantly better health metrics compared to those on Champion Island, including higher body condition index scores, packed cell volumes, and lymphocyte counts, alongside lower heterophil and eosinophil counts. Over four years of monitoring, no evidence of Chlamydophila psittaci DNA or antibodies to paramyxovirus-I, adenovirus-II, or Mycoplasma gallisepticum was detected in either population, though ectoparasites varied between islands. A coccidian species was found exclusively in fecal samples from Gardner-by-Floreana birds. These findings suggest Gardner-by-Floreana as a healthier source population for the ongoing reintroduction plan to Floreana Island, where the main population was extirpated over a century ago. The study integrated physical examinations, hematology, and parasite analysis to assess health status, providing critical data for conservation decisions.
Ecology, demography and conservation in the Galapagos Islands flora
The Galápagos Islands, true oceanic islands rising from a shallow submarine platform, exhibit remarkable geological diversity with ages ranging from 4.5 million years to as young as 60,000 years before present (bp). The eastern islands, such as Española and Santa Cruz, are composed of older uplifted lava flows, while the western islands like Fernandina and Isabela are formed by younger shield volcanoes with frequent eruptions. These volcanic landscapes display a variety of features including craters, barren fields of lava or scoria, and vegetated areas. The study provides insights into the ecological and demographic patterns of the Galápagos flora, emphasizing the unique geological history that shapes its biodiversity.
Hyperspectral remote sensing of salinity stress on red (Rhizophora mangle) and white (Laguncularia racemosa) mangroves on Galapagos Islands
Research demonstrates that hyperspectral remote sensing can effectively monitor salinity stress in red (Rhizophora mangle) and white (Laguncularia racemosa) mangroves on the Galápagos Islands. Using the photochemical reflectance index (PRI) as a proxy for photosynthetic rate, the study found strong correlations between PRI values and salinity gradients, suggesting that this method could be used to track mangrove forest growth on a regional scale. This approach offers a promising tool for large-scale conservation efforts by providing real-time data on how these critical coastal ecosystems respond to environmental stress.
Nature's Eden? The production and effects of 'Pristine' nature in the Galápagos Islands.
The Galápagos Islands, renowned as an 'evolutionary Eden' and a symbol of pristine nature, are not inherently natural but are socially constructed concepts that shape tourism and infrastructure development. This study reveals how the perception of pristine nature in the Galápagos has led to uneven social outcomes and environmental impacts, despite its UNESCO World Heritage status. By analyzing the material and political effects of these understandings, researchers demonstrate that the crisis of overdevelopment stems from the idealization of untouched landscapes rather than ecological realities. The paper argues for a rethinking of the islands' nature, emphasizing the need to address the complexity of social-environmental relations to mitigate ongoing challenges.
Nature’s Eden? The Production and Effects of ‘Pristine’ Nature in the Galápagos Islands
The Galápagos Islands, renowned as an 'evolutionary Eden,' are often perceived as a bastion of pristine nature. However, research reveals that the concept of 'pristine' nature is not innate but socially constructed, reflecting specific understandings of island space. This study demonstrates how such perceptions shape tourism and infrastructure investments, leading to social inequalities and environmental harm. It argues for a reevaluation of the islands' nature, emphasizing the complexity of social-environmental relations. Measures addressing the current crisis would benefit from this critical perspective.
Phylogenetic analysis of the fecal microbial community in herbivorous land and marine iguanas of the Galápagos Islands using 16S rRNA-based pyrosequencing
Diet significantly shapes the gut microbial communities of herbivorous iguanas in the Galápagos Islands, with marine and land iguanas exhibiting distinct bacterial compositions. Marine iguanas, which consume algae, show higher abundances of Bacteroides spp., Lachnospiraceae, and Clostridiaceae, while land iguanas, feeding on terrestrial vegetation, harbor a greater diversity of operational taxonomic units (OTUs) and a fivefold increase in Ruminococcaceae. Archaea were uniquely detected in land iguanas, suggesting their role in breaking down recalcitrant polysaccharides. The study used 16S rRNA-based pyrosequencing to analyze fecal samples from both species across the archipelago, revealing novel microbial diversity that could lead to discoveries of enzymes capable of degrading complex polysaccharides.
Thysanoptera of the Galápagos Islands
A comprehensive inventory of Thysanoptera (thrips) in the Galápagos Islands reveals 77 species across 17 islands, including nine pest species. This represents a 54% increase from previously known records, with four species—Frankliniella occidentalis, Gynaikothrips uzeli, Thrips palmi, and Thrips tabaci—documented for the first time in the archipelago. The study combined museum specimens, field collections (2009), and published literature to achieve this significant expansion of the Galápagos thrips fauna.
Unravelling the peculiarities of island life: vicariance, dispersal and the diversification of the extinct and extant giant Galápagos tortoises
Research reveals that the evolutionary history of Galápagos tortoises is shaped by both dispersal and vicariance, challenging traditional assumptions about island colonization. Only three of five extinct or nearly extinct species represent independent evolutionary units, with dispersal from South America initiating around 3.2 million years ago (Ma) following the emergence of San Cristobal and Española islands. Subsequent dispersal to younger islands began at approximately 1.74 Ma, accompanied by multiple colonizations within the archipelago. Vicariant events, driven by island formation, coalescence, and separation, contributed to lineage diversification on Pinzón and Floreana dating from 1.26 and 0.85 Ma, respectively. This study integrates DNA data from extinct and extant species with geological information and human activity records, providing a comprehensive model for reconstructing the history of endangered taxa despite extinctions and human-mediated dispersal events.
West Nile Virus Vector Competency of Culex quinquefasciatus Mosquitoes in the Galápagos Islands
Galápagos mosquitoes, specifically Culex quinquefasciatus, are competent vectors for West Nile virus (WNV), posing potential risks to the islands' fragile ecosystems. Research revealed that these mosquitoes can transmit WNV with infection rates peaking at 59% and transmission rates at 44%, particularly after 28 days of exposure. Temperature influenced infection rates but not transmission efficiency, while no vertical transmission was detected. The study highlights the need for vigilance in controlling this mosquito population to mitigate risks to both wildlife and public health.
An analysis of modern pollen representation and climatic conditions on the Galápagos Islands
A groundbreaking pollen trapping study on the Galápagos Islands reveals significant long-distance dispersal of pollen, particularly from mainland and neighboring islands, especially in areas with low local pollen production. The research identified distinct habitat types through pollen analysis and documented the over- and under-representation of ecological dominants, including invasive exotic species. Climate data highlighted the cooling effect of ground-level clouds (garúa) on highland temperatures, emphasizing its crucial role in the conservation of the islands' endemic flora. Conducted across four islands—Genovesa, Rocas Bainbridge, Santa Cruz, and San Cristobal—the study used HOBO data loggers to collect temperature, humidity, and dew point data every 30 minutes for a year, providing insights into modern pollen representation and climatic conditions.
Community Expansion and Infrastructure Development: Implications for Human Health and Environmental Quality in the Galápagos Islands of Ecuador
Urban expansion and infrastructure development in Puerto Villamil, Isabela Island, Galápagos, pose significant risks to human health and environmental quality. The study reveals that the rapid growth of the community has outpaced the development of essential services like water and sanitation, leading to potential contamination and waterborne diseases. Researchers used a combination of geospatial analysis—including time-series aerial photographs and satellite images—to map infrastructure and assess its proximity to natural environments. Complementing this with qualitative data from interviews with health officials and residents, the study highlights the critical need for sustainable urban planning to mitigate adverse impacts on both public health and ecosystem integrity.
Coupling between subtidal prey and consumers along a mesoscale upwelling gradient in the Galápagos Islands
Research in the Galápagos Islands reveals that upwelling intensity significantly influences prey production and predator-prey dynamics at mesoscale levels. The study found that strong upwelling sites (SUP) exhibited higher barnacle recruitment and growth, driven by vertical flow speeds and larval concentrations, compared to weak upwelling sites (WUP). This bottom-up effect was coupled with top-down control, as whelk densities correlated strongly with barnacle cover and recruitment. Predation experiments further demonstrated that 33–100% of barnacles were consumed by whelks and fish, with higher consumption rates at SUP sites. The study also linked upwelling duration to seafloor topography, suggesting that steep slopes and deep water enhance upwelling from internal waves and the Equatorial Undercurrent (EUC). These findings highlight the critical role of oceanographic processes in structuring marine communities over broad spatial scales.
Exposure to Toxoplasma gondii in Galapagos Penguins (Spheniscus mendiculus) and Flightless Cormorants (Phalacrocorax harrisi) in the Galapagos Islands, Ecuador
A study on the Galápagos Islands revealed that both Galapagos Penguins and Flightless Cormorants exhibit exposure to Toxoplasma gondii, a common protozoan parasite. Surprisingly, higher antibody prevalence was found in penguins on Fernandina Island, which lacks feral cats, compared to Isabela Island where cats are present. While the difference was not statistically significant for cormorants, this is the first evidence of T. gondii exposure in these endemic avian species, suggesting potential disease risks linked to the archipelago's feral cat population.
Feeding ecology of the green sea turtle (Chelonia mydas) in the Galapagos Islands
Green sea turtles (Chelonia mydas) in the Galápagos Islands exhibit significant variation in their diet, both spatially and seasonally. The study identified Ulva lactuca as a dominant algae species consumed across foraging grounds, with dietary composition differing notably between Bahia Elizabeth, Caleta Derek, and Punta Nuñez. Seasonal shifts were also observed, with diets during the warm season showing greater algal diversity compared to the cold season. This research, based on 65 oesophageal samples collected in 2006 and 2007, highlights the importance of spatial and temporal factors in shaping the feeding ecology of this species. The findings underscore the need for targeted conservation strategies that account for these dietary dynamics.
Four new species and one new genus of zoanthids (Cnidaria, Hexacorallia) from the Galapagos Islands
Researchers have identified four new species of zoanthids, including two belonging to a newly described genus, Terrazoanthus, from the Galápagos Islands. These findings expand the known biodiversity of macrocnemic zoanthids in the region. Two species, Terrazoanthus onoi and Terrazoanthus sinnigeri, are distinguished by their attachment to abiotic substrates, contrasting with the type genus Hydrozoanthus, which associates with hydrozoans. Antipathozoanthus hickmani is notable for its exclusive association with the antipatharian Antipathes galapagensis, while Parazoanthus darwini frequently associates with sponges. The two Terrazoanthus species share identical mitochondrial DNA sequences but can be distinguished by subtle differences in their internal transcribed spacer of ribosomal DNA (ITS-rDNA). This study combines morphological and molecular analyses to elucidate the taxonomic diversity and ecological relationships of zoanthids in the Galápagos.
Hotspots within hotspots? Hammerhead shark movements around Wolf Island, Galapagos Marine Reserve
Research at Wolf Island, part of the Galápagos Marine Reserve, reveals that scalloped hammerhead sharks and other pelagic species exhibit non-uniform distribution even within known biodiversity hotspots. Using ultrasonic transmitters, vessel-based tracking, and visual censuses, scientists found these species aggregate predominantly in the southeastern corner of Wolf Island, rather than uniformly across the site or around nearby Darwin Island. This fine-scale clustering suggests that hammerhead sharks can serve as indicator and umbrella species for pelagic biodiversity hotspots, offering insights into the spatial organization of marine life.
Marketing Tourism In The Galapagos Islands: Ecotourism Or Greenwashing?
The Galápagos Islands, despite their designation as a UNESCO World Heritage Site in Danger due to tourism pressures, face significant challenges from greenwashing in the ecotourism sector. A study analyzed the marketing claims of 12 ecotourism operators against the Mohonk Agreement criteria for responsible ecotourism, revealing that nearly all (92%) engaged in greenwashing—promoting environmentally friendly practices while failing to meet conservation or community welfare standards. This misrepresentation exacerbates ecological threats, including invasive species introduction and habitat degradation, undermining genuine conservation efforts. The findings highlight the urgent need for standardized certification and stricter oversight to ensure ecotourism aligns with its ethical and environmental goals.
Seasonal effects and fine-scale population dynamics of Aedes taeniorhynchus, a major disease vector in the Galapagos Islands
Research reveals that coastal and highland populations of the mosquito Aedes taeniorhynchus in the Galápagos Islands exhibit strong genetic differentiation year-round, with limited gene flow occurring only during periods of increased precipitation. This suggests that ecological differences between habitats drive adaptation and divergence, potentially leading to incipient speciation. Highland populations show signs of founder effects or reduced breeding sites, yet maintain genetic diversity over time, implying survival through dry periods as dormant eggs. Mosquito abundance in highlands is strongly linked to precipitation, while coastal populations are more influenced by tide height. These findings highlight potential differences in mosquito-borne disease dynamics between habitats and increased infection risk during wetter conditions.
The family Graphidaceae (Ostropales, Lecanoromycetes) in the Galapagos Islands
A comprehensive inventory of the Galápagos lichen flora reveals that the family Graphidaceae comprises 42 species, including two newly described species: Graphis pedunculata and Phaeographis striata. Additionally, three new combinations are established for existing taxa. Four previously reported species were found to be misidentifications and are excluded from the checklist. The study provides detailed descriptions, diagnostic characteristics, and an identification key for all Galapagos Graphidaceae species, along with a preliminary assessment of their distribution and ecology. Principal components analysis was employed to assess ecological patterns in 39 species, contributing significantly to the understanding of lichen biodiversity in this UNESCO World Heritage Site.
When is an invasive not an invasive? Macrofossil evidence of doubtful native plant species in the Galápagos Islands
A groundbreaking study using macrofossil analysis reveals that six plant species previously classified as doubtful natives or invasive in the Galápagos Islands are, in fact, native to the archipelago. The research challenges long-held assumptions about the origin of these species and their impact on the islands' unique biodiversity. By examining sedimentary records, the study provides critical insights into the native flora of the Galápagos over the past 500-1000 years, offering a new framework for understanding and conserving the region's ecological heritage. This approach not only clarifies the status of these species but also sets a precedent for using palaeobotanical data to inform conservation efforts in other oceanic islands.
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