Publications
Continuing subsidence and deformation of the Surtsey volcano, Iceland
Surtsey, a volcanic island formed off Iceland's coast between 1963 and 1967, continues to experience significant subsidence. Since its formation, the island has sunk by approximately 1 meter, with recent GPS surveys (2000–2023) revealing an average subsidence rate of 3.8 mm per year, totaling 9 cm over this period. About two-thirds of this subsidence is attributed to compaction of sedimentary and volcaniclastic material, thermal contraction, and palagonization, while the remaining third is due to the island's loading on the asthenosphere. The study also confirms that Surtsey moves horizontally with the Eurasian plate, providing insights into the dynamic processes shaping volcanic islands.
Flavobacterium aerium sp. nov., a bacterium isolated from the air of the Icelandic volcanic island Surtsey
Researchers have identified and characterized a novel bacterium, Flavobacterium aerium sp. nov., isolated from the air of Surtsey, a volcanic island in Iceland designated as a UNESCO World Heritage Site. This discovery was made using a polyphasic taxonomic approach, which included phylogenetic analysis based on 16S rRNA gene sequences, fatty acid profiling, and genomic sequencing. The bacterium, designated strain 19SA41, exhibits unique morphological and physiological traits, such as pale yellow-pigmented colonies, optimal growth at 22 °C and pH 7.5, and a genome with a G+C content of 33.2 mol%. Phylogenetic analysis revealed that F. aerium is most closely related to Flavobacterium xinjiangense, with a sequence similarity of 96.52%, supporting its classification as a novel species. This finding contributes to the understanding of microbial diversity in extreme environments and underscores the significance of UNESCO World Heritage Sites for scientific research.
Sinkholes observed at Vesturbunki, Surtsey
Researchers have identified and monitored sinkholes and fissures along the outer margin of Vesturbunki, one of Surtsey’s tuff cones, revealing a dynamic subsurface process. These features, first observed in 2015, were traced over nearly 500 meters and showed variability in their presence across multiple field visits (2017, 2019, 2025). The study suggests that these sinkholes are likely driven by a combination of island-wide subsidence, local compaction of volcanogenic material, and possibly triggered by seismicity. Surface temperature monitoring between 2008 and 2025 indicated Vesturbunki is consistently hotter (up to 100°C) compared to Austurbunki (up to 96°C), with fluctuations linked to subsurface heat flow. Seismic data from 2009–2024 showed low to moderate activity, though hypocenter locations remain uncertain due to sparse station coverage. The findings underscore the need for continued monitoring and installation of a local seismic station on Surtsey to better understand these processes.
Weather in Surtsey 2020-2024
A new maximum air temperature record of 22.6°C was set on Surtsey, Iceland's southernmost island, on 14 July 2025, breaking the previous record of 18.6°C from 11 July 2023. This study analyzes weather data from 2020 to 2024, highlighting significant variations, including a notably cloudy and cool summer in 2022 and a winter (2022–2023) marked by alternating warm/windy and cold/calm months. The research also identified extreme sea level pressure records of 1050.4 hPa and 932.3 hPa on 28 March 2020 and 15 February 2020, respectively. While temperature and wind data were robust, precipitation measurements faced considerable failures. The study aims to provide insights useful for understanding ecological processes on the island, which serves as a scientific laboratory for flora and fauna development.
Internal structure of the volcanic island of Surtsey and surroundings: Constraints from a dense aeromagnetic survey
A dense aeromagnetic survey of Surtsey, a young volcanic island off Iceland's south coast, reveals that the island lacks significant basaltic intrusions within its five vents, suggesting magma fragmentation dominated submarine eruptions from the onset. The study, using 2D spectral analysis and Euler deconvolution, identified a small magnetic anomaly over the submarine edifice of Surtla, hinting at preserved dykes during weak or moderate explosive activity in 1963–1964. Additionally, a 10–20 m thick pillow lava field, extending ~1 km south of Surtsey, was detected, indicating channelized intrusive flow during early effusive eruptions in May–July 1964. The survey also found indications of magnetized volcanic rocks predating the Surtsey eruption beneath Jólnir, an ephemeral island.
Material and mechanical properties of young basalt in drill cores from the oceanic island of Surtsey, Iceland
Drill core samples from Surtsey, an oceanic island formed by eruptions between 1963 and 1967, reveal significant variability in the material and mechanical properties of young basalt deposits. These properties vary across subaerial, submarine, and subseafloor environments, with connected porosity ranging from 42% to 21%, permeability spanning six orders of magnitude, and uniaxial compressive strength varying between 10–70 MPa. Synchrotron X-ray microdiffraction analyses combined with geochemical data show that the initial alteration of fresh glass and incipient consolidation of a fine-ash matrix play crucial roles in modifying these properties. The study highlights how diverse cementing microstructures influence the physical characteristics of pyroclastic deposits, providing critical reference parameters for geophysical studies and understanding the stability and survival of oceanic islands over time.
Authigenic mineralization in Surtsey basaltic tuff deposits at 50 years after eruption
A study of Surtsey, a basaltic island in SW Iceland, reveals that authigenic mineralization processes in young pyroclastic deposits are influenced by thermal and hydrological factors, as well as the chemistry of original basaltic components. Researchers analyzed 50-year-old tuff samples from a borehole drilled in 2017 using petrographic studies, X-ray powder diffraction, and SEM-EDS imaging. They found multi-stage palagonitization processes and secondary mineral precipitation, including phillipsite, analcime, and Al-tobermorite, within basaltic pyroclasts. Temperature plays a significant role in controlling these reactions, but the chemistry of interstitial fluids also influences reaction pathways. This study provides a reference framework for understanding mineralogical evolution in Surtseyan-type volcanoes worldwide.
Comparison of Atmospheric and Lithospheric Culturable Bacterial Communities from Two Dissimilar Active Volcanic Sites, Surtsey Island and Fimmvörðuháls Mountain in Iceland
A comparative analysis of atmospheric and lithospheric bacterial communities at two distinct Icelandic volcanic sites—Surtsey Island and Fimmvörðuháls Mountain—revealed significant differences, with Surtsey's air hosting unique microbial populations. Using MALDI Biotyper analysis and 16S rRNA gene sequencing, researchers identified 72 species across 40 genera, including potential new species, predominantly from the Proteobacteria and Actinobacteria phyla. Back trajectory analysis suggested that 85% of isolates originated locally, while 15% traveled long distances. Taxonomic proportions mirrored the sites' environmental characteristics, offering insights into microbial dispersal dynamics in volcanic ecosystems.
Bryophytes of Surtsey, Iceland: Latest developments and a glimpse of the future
A recent study on Surtsey, Iceland—the youngest island in the Vestmannaeyjar archipelago—reveals that bryophyte species richness has increased from 43 to 59 taxa between 2008 and 2018. The research, conducted through systematic inventories in a grid of 100 m × 100 m quadrats, found that while some areas experienced expansion or contraction of earlier colonists, others showed significant increases in species richness, particularly in seabird-affected zones not overgrown by grassland. Additionally, the study compared bryophyte flora on Surtsey with that of Elliðaey, a 5,000-year-old island, identifying shared and unique taxa. The findings suggest that bryophyte diversity on Surtsey will continue to grow but may eventually decline as lava fields erode and grassland dominates. Continued monitoring is deemed essential for tracking these changes.
Characteristics of Sub-Aerially Emplaced Pyroclasts in the Surtsey Eruption Deposits: Implications for Diverse Surtseyan Eruptive Styles
A new analysis of the 1963–1967 Surtsey eruption deposits reveals diverse pyroclastic textures and microstructures, challenging previous assumptions about Surtseyan volcanism. The study identifies distinct subaerial cone-forming deposits—characterized by poorly sorted fines rich in sideromelane ash and composite bombs—and submarine edifice samples with fines-poor, vesicular coarse ash horizons. This diversity suggests a broader range of eruptive styles than previously recognized. Researchers examined archived samples from the Icelandic Natural History Museum, including material collected during the eruption and from the 1979 Surtsey core, alongside recent field samples. The findings imply that Surtseyan eruptions can produce varied volcanic products depending on vent conditions.
Culturable Bacterial Diversity from the Basaltic Subsurface of the Young Volcanic Island of Surtsey, Iceland
Research on Surtsey, Iceland, reveals the subsurface of this young volcanic island hosts diverse and active microbial communities, with over 195 culturable bacterial strains identified. These belong to six phyla, including Firmicutes (40%) and Gammaproteobacteria (28.7%), with Bacillus being the dominant genus. Over 13% of the strains may represent novel species, closely related to those found in soil, seawater, and hydrothermal sites. The study used enrichment cultures under varying conditions, media, and temperatures, combined with MALDI-TOF MS analysis and 16S rRNA gene sequencing. While only five phyla were cultivated, they accounted for over 80% of the detected ASVs, underscoring the importance of both culture-dependent and -independent methods in exploring extreme volcanic environments.
Measurements of the inclination of the SE-03 Borehole on Surtsey Volcano
A precise measurement of the SE-03 borehole's inclination on Surtsey Volcano reveals that its average deviation from vertical is 33.4±0.2°, slightly less than the planned 35°. This minor discrepancy, corrected for in the study, confirms the location of a volcanic intrusion directly beneath the Surtur crater, identified as the feeder dyke for the 1966-67 eruption. The borehole's actual path was found to be 8 meters shorter and 4.7 meters deeper than designed, with a total vertical depth of 294.7±1.2 meters. These findings enhance the accuracy of stratigraphic interpretations derived from the SE-03 drill core, supporting the understanding of Surtsey's submarine structure and volcanic activity.
Rhodothermus bifroesti sp. nov., a thermophilic bacterium isolated from the basaltic subsurface of the volcanic island Surtsey
Scientists have discovered a novel thermophilic bacterium, Rhodothermus bifroesti sp. nov., in the basaltic subsurface of Surtsey, a volcanic island off Iceland's south coast. This Gram-negative, rod-shaped microorganism thrives at 70°C and exhibits distinct genetic traits, setting it apart from its closest relatives with only 17.6% digital DNA–DNA hybridization similarity to Rhodothermus marinus and 16.9% to Rhodothermus profundi. The bacterium was isolated from tephra core and borehole fluid samples collected below 70 meters depth, highlighting the unique microbial diversity in extreme environments. Comparative chemotaxonomic, genomic, and phylogenetic analyses confirmed its status as a new species within the genus Rhodothermus.
Systemic analysis of a developing plant community on the island of Surtsey
A volcanic island's plant community undergoes a complete adaptive cycle, transitioning from pioneer to grassland stages, driven primarily by nutrients deposited by breeding gulls. This finding emerges from a systemic analysis of Surtsey's vascular plants between 2000 and 2018, which also reveals deviations in the adaptive cycle due to environmental stressors like severe drought in 2012. The study employs a novel method to quantify adaptive cycles, offering insights into species' roles during ecological succession.
The development of the land-arthropod fauna on Surtsey, Iceland, during 1971-1976 with notes on terrestrial Oligochaeta
Surtsey, a volcanic island off Iceland's south coast, offers a unique laboratory for studying ecological succession. A 1973 study by Lindroth et al., analyzed terrestrial invertebrate data from Surtsey and its surroundings between 1964-1970, revealing the initial stages of colonization and adaptation in an extreme environment. The research identified key arthropod species that established themselves on the young volcanic terrain, highlighting the rapidity with which certain organisms can exploit new habitats. This study laid foundational knowledge for understanding ecological processes in primary succession, particularly focusing on how arthropods contribute to soil formation and ecosystem development. The findings underscore Surtsey's significance as a natural experiment for studying colonization dynamics, offering insights applicable to other newly formed terrestrial environments.
Vascular plant colonisation, distribution and vegetation development on Surtsey during 1965–2015
Between 1965 and 2015, Surtsey witnessed significant vascular plant colonization, with 74 species identified. Initial rapid colonization (1965–1979) stagnated until the establishment of a dense seagull colony in 1986, which drastically accelerated plant growth, peaking between 1992 and 1995. Six vegetation types emerged, ranging from sparse pioneer communities to lush, nutrient-rich grasslands influenced by seabird activity. Species richness increased from an average of 4.8 to 10.4 per hectare over the study period. Pioneering species like Honckenya peploides, Poa annua, and Silene uniflora led colonization, thriving on sandy lava and barren surfaces. Despite seabird impacts, most of Surtsey remains sparsely vegetated, offering insights into ecological succession in extreme environments.
Volcanic tremor associated with the Surtsey eruption of 1963–1967
The Surtsey eruption (1963–1967) revealed a complex relationship between volcanic tremor and magma flow, challenging conventional assumptions. Despite high magma discharge rates during initial explosive phases, seismic tremor was minimal, while later stages with reduced output exhibited significant tremor. Harmonic and spasmodic tremor frequencies varied from low (>3 Hz) to higher (3–5 Hz), with no clear link between tremor patterns and eruption style on short timescales. This study analyzed archival seismic data from two distant stations, demonstrating that even with limited modern monitoring, volcanic processes can be inferred through detailed seismogram analysis.
A model for wave abrasion on underwater bedrock, with an application to rapidly downwearing tephra cones adjacent to Surtsey Island in Iceland
Wave abrasion, a key process shaping shallow-water coastal bedrock, has been quantified through a predictive model linking erosion rates to wave-induced shear stress and bedrock resistivity. Applied to two tephra cones near Surtsey Island in Iceland—Jólnir (storm-exposed) and Syrtlingur (sheltered)—the model reveals distinct abrasion dynamics: Syrtlingur experiences 33% less deep-water wave energy but fourfold more efficient abrasion, with a shallower wave base (34.4 m vs. 51.5 m for Jólnir). The findings highlight how storm exposure and sheltering influence erosion patterns, offering insights into coastal bedrock evolution under varying hydrodynamic conditions.
Basalt-Hosted Microbial Communities in the Subsurface of the Young Volcanic Island of Surtsey, Iceland
Research on Surtsey, a volcanic island formed between 1963 and 1967, reveals diverse and distinct microbial communities thriving in its subsurface basaltic crust, including thermophilic species such as Thermaerobacter, BRH-c8a (Desulfallas-Sporotomaculum), Thioalkalimicrobium, and Sulfurospirillum. These findings, derived from 16S rRNA gene amplicon sequencing and scanning electron microscopy, highlight the island's potential as a model for studying microbial colonization in newly formed oceanic crust. The study also identifies uncharacterized taxonomic lineages, suggesting rich metabolic diversity. To distinguish endemic microbes from contaminants, rigorous methodological and computational strategies were employed during the International Continental Scientific Drilling Program expedition.
Availability of plant nutrients and pollutants in the young soils of Surtsey compared to the older Heimaey and Elliðaey volcanic islands
Nitrogen (N) is the most limiting nutrient for plant growth across sub-Arctic volcanic ecosystems, regardless of soil age or seabird presence. A study comparing young Surtsey (50 years old) to older Heimaey and Elliðaey (~1600 years) found that while seabird colonies enhance availability of most nutrients—including phosphorus (P), potassium (K), magnesium (Mg), calcium (Ca), sulfur (S), iron (Fe), manganese (Mn), and zinc (Zn)—N consistently constrained plant productivity. On Surtsey’s thinner tephra soils, low P availability may also contribute to co-limitation, warranting further investigation. No accumulation of cadmium (Cd) or lead (Pb) was detected in seabird colonies. The study used resin membranes incubated in topsoil (0–10 cm) to measure nutrient dynamics, revealing how time and biotic factors shape ecosystem development on unvegetated volcanic substrates.
Effects of sea birds and soil development on plant and soil nutritional parameters after 50 years of succession on Surtsey
Research on Surtsey, a volcanic island formed during submarine eruptions from 1963 to 1967, reveals that seabird colonies play a pivotal role in shaping soil nutritional characteristics and plant productivity. A study conducted in 2013 found that the presence of seagulls significantly increased nitrogen (N) and phosphorus (P) concentrations in tephra soils, with δ15N analyses confirming the transfer of N from bird waste to plants. Despite the high P availability in volcanic soils and substantial N input by birds—47 kg N ha-1 yr-1—vegetation on Surtsey remains nitrogen-limited due to the extreme imbalance between N and P. The study highlights the critical impact of seabird colonies on the nutritional ecology of young, nutrient-poor ecosystems like Surtsey.
Erosion and sedimentation in Surtsey island quantified from new DEMs
A photogrammetric study of Surtsey, an Icelandic UNESCO World Heritage Site, reveals that coastal wave erosion has removed approximately 28 million cubic meters of lava fields since 1967, with a current rate of loss at 0.4 million cubic meters per year. Tuff cones, though more resistant, have also eroded significantly, losing about 1.6 million cubic meters, primarily due to wind deflation and runoff. The study used three new digital elevation models (DEMs) derived from aerial images (1967, 1974) and high-resolution close-range imagery (2019) to quantify these changes. Erosion rates were initially much higher post-eruption but have since stabilized, with projections suggesting the island may become a tuff crag within the next century.
Hydrozoan colonization and succession in the tidal and subtidal zones in Surtsey during the period 1967 to 1984
By 1984, Surtsey’s intertidal and subtidal rocky bottoms hosted 37 hydrozoan species, making them one of the most diverse marine invertebrate groups on the island. This steady increase in species diversity over 17 years suggests that colonization continues even two decades after the formation of rocky shores. The study highlights the importance of both planktonic medusa dispersal and rafting of polyps on floating debris as key mechanisms for hydrozoan establishment. Conducted between 1967 and 1984, the research involved sampling in intertidal zones and subtidal depths down to 40 meters, documenting eight species previously unrecorded in Iceland.
Lithofacies from the 1963-1967 Surtsey eruption in SUSTAIN drill cores SE-2a, SE-2b and SE-03
A comprehensive analysis of drill cores from Surtsey, collected during the 2017 SUSTAIN project, reveals significant insights into the volcanic activity that shaped the island between 1963 and 1967. The study identified armoured lapilli tuff and lapilli tuff, primarily formed by explosive eruptions at Surtur, with notable intervals of coherent basalt likely representing intrusions that fed later lava flows. These findings challenge previous understandings, as the 2017 drill cores did not intersect a thick basalt interval found in earlier drilling, suggesting complex volcanic processes. The research also highlights extensive hydrothermal alteration and cement deposition, indicating the dynamic interaction between volcanic materials and seawater. Additionally, the angled drill hole SE-03 provided evidence that Surtur's eruptions excavated the pre-eruption sea floor to depths of several tens of meters.
Observations on the structure of Surtsey
New insights into the subsurface structure of Surtsey, an Icelandic volcanic island, challenge previous understandings of its geothermal dynamics. Analysis of 2017 cored boreholes reveals that near-surface layering dips westerly, indicating the boreholes are within the Surtur crater, and suggests a broad diatreme underlies the vent. Temperature measurements in these boreholes show peak temperatures of 124–127 °C at depths of 105–115 meters below the surface, with residual heat detected up to 290 meters depth, implying a broad, warm substrate rather than localized intrusions. This challenges the earlier hypothesis of a nearby intrusion as the source of the heat anomaly and instead supports a model where heat was conducted from a hot lava shield into a diatreme, creating a vapor-dominated system below sea level.
Petrograpic and material observations of basaltic lapilli tuff, 1979 and 2017 Surtsey drill cores, Iceland
A comparative petrographic analysis of basaltic lapilli tuff from Surtsey's 1979 and 2017 drill cores reveals evidence of rapid microbial activity, with tubular microstructures suggesting growth rates up to 30 µm in approximately 15 years. The study also identifies differential alteration processes in the volcano's structural and hydrothermal zones over time, while long-term storage significantly impacts glass stability. Narrow ash rims on pyroclasts indicate complex eruptive and depositional dynamics. Material measurements show varying oven-dry densities correlating with porosity and water absorption. This foundational work advances understanding of tephra alteration in volcanic and curatorial environments.
Seabirds and seals as drivers of plant succession on Surtsey
Seabirds and seals are key drivers of plant succession on Surtsey, accelerating vegetation development through nutrient transfer from sea to land. Since 1965, 75 vascular plant species have colonized the island, with 40 establishing viable populations. Recent decades show slowed colonization, but dense vegetation (2 ha in 2018) has emerged on the northern spit due to seagull breeding and grey seal haul-outs. A 2019 survey revealed overlapping seal distribution and dense vegetation, suggesting seals contribute 9-13 kg N/ha annually, comparable to seagulls' 5-30 kg N/ha input. Plant biomass measurements indicate the spit's development mirrors that of an older gull colony in the south, highlighting the combined role of seabirds and seals in shaping Surtsey's ecosystem. Further research is recommended to quantify seal impacts on nutrient cycling.
The climate of Surtsey
Surtsey, an Icelandic volcanic island, experiences a mild yet windy climate with no monthly mean temperatures below freezing and sustained winds exceeding 20 m/s on average 30 days annually. A comprehensive analysis of meteorological data, collected continuously since 2009, reveals that Surtsey's climate closely resembles that of nearby Vestmannaeyjar stations—Vestmannaeyjabær and Stórhöfði—though wind speeds vary due to local sheltering effects. Precipitation patterns indicate drier summers and the most variable, wettest conditions in October. This study provides the first detailed characterization of Surtsey's climate, leveraging long-term automatic measurements to compare microclimatic differences within the archipelago.
Vascular plant colonisation of Surtsey Island (1965-1990) - a dataset
A comprehensive dataset of vascular plant occurrences on Surtsey Island, Iceland, documents the early stages of primary succession from 1965 to 1990. This rare record of unperturbed colonization over three decades provides an invaluable baseline for studying ecological processes in pristine conditions. The dataset includes 10,094 georeferenced plant observations, offering a unique opportunity for comparative research on plant dynamics and succession. Surtsey's isolation and early protection efforts minimize human disturbance, making it an ideal natural laboratory for tracking ecosystem development on new volcanic substrates.
Authigenic Mineral Texture in Submarine 1979 Basalt Drill Core, Surtsey Volcano, Iceland
A groundbreaking study of the 1979 Surtsey volcano, Iceland, reveals complex authigenic mineral textures in submarine basalt, offering new insights into low-temperature hydrothermal alteration. Using advanced synchrotron X-ray microdiffraction, microfluorescence, and Raman spectroscopy, researchers mapped nanocrystalline clay minerals (nontronite), zeolites, and Al-tobermorite within vesicular and fractured lapilli from drill cores at depths of 157.1 m, 137.9 m, and 102.6 m. Notably, linear microstructures with crystallographic preferred orientation—unprecedented in young basalt—were identified alongside potential biological signatures, such as degraded carbonaceous matter. These findings challenge existing models of basalt alteration, providing a mineralogical baseline for studying oceanic environments over time.
Design of the subsurface observatory at Surtsey volcano, Iceland
A subsurface observatory at Surtsey, Iceland's youngest volcanic island, offers unprecedented insights into microbial life and hydrothermal processes in young basaltic tuff. The 2017 ICDP SUSTAIN Expedition drilled three boreholes through the active hydrothermal system, with one equipped to monitor water-rock interactions and microbial activity under sterile conditions. Using filtered seawater and UV sterilization, researchers maintained a contamination-free environment, enabling experiments at temperatures from 25°C to 125°C—approaching the upper limit of functional life (~121°C). The observatory provides a natural laboratory for studying fluid-rock-microbe interactions over time, with comparisons to 1979 and 2019 drill cores offering a 50-year perspective on hydrothermal evolution. This design bridges field observations and experimental validation, advancing understanding of submarine microbial processes.
Operational report for the 2017 Surtsey Underwater volcanic System for Thermophiles, Alteration processes and INnovative concretes (SUSTAIN) drilling project at Surtsey Volcano, Iceland
A groundbreaking drilling project at Surtsey, Iceland, revealed unprecedented insights into the volcano's subsurface structure and thermal dynamics. The 2017 SUSTAIN project successfully drilled three boreholes, including a deep angled hole reaching 354 meters (~290 m vertical depth), traversing the volcano's conduit and intrusions. This provided the first detailed vertical profile of a young volcanic system, offering critical data on thermophiles, alteration processes, and innovative concrete applications in extreme environments. The project utilized advanced drilling techniques, including seawater-based drilling fluids and wireline logging, to maintain sterility and gather high-quality core samples. Over 650 meters of core were analyzed, contributing to our understanding of volcanic systems and their potential for geothermal energy and construction materials.
SUSTAIN drilling at Surtsey volcano, Iceland, tracks hydrothermal and microbiological interactions in basalt 50 years after eruption
The SUSTAIN drilling project at Surtsey, Iceland, provides unprecedented insights into the hydrothermal and microbiological changes occurring in basaltic tephra and minor intrusions over 50 years post-eruption. By analyzing two vertical boreholes (152 m and 192 m deep) and an inclined borehole (354 m measured depth), researchers tracked mineralogical, geochemical, and microbiological alterations from 1979 to 2017, revealing temperature-dependent processes ranging from 25–141 °C. The study also identified a diatreme extending at least 100 m beneath the Surtur crater, enhancing understanding of eruption dynamics. Rigorous drilling protocols ensured minimal environmental impact on this UNESCO-listed site.
Anhydrobiosis and Freezing-Tolerance: Adaptations That Facilitate the Establishment of Panagrolaimus Nematodes in Polar Habitats
Researchers discovered that several Panagrolaimus nematode strains, including those from polar habitats, possess both anhydrobiosis and freezing-tolerance traits, enabling survival in extreme conditions. These adaptations allow them to endure water loss and intracellular ice formation while also inhibiting ice crystal growth. Phylogenetic analysis revealed that these traits evolved early in the lineage, with some Antarctic and Surtsey isolates showing robust freezing tolerance without specialized polar adaptations. The study suggests that the colonization of harsh environments like Ross Island and Surtsey by these nematodes may stem from recent 'ecological fitting' rather than evolutionary specialization.
Colonization, succession and conservation: the invertebrates of Anak Krakatau, Indonesia, and contrast with Surtsey
A comparison of invertebrate colonization and succession on Anak Krakatau, Indonesia, and Surtsey reveals the dynamic interplay between aeolian and vegetation-based processes in shaping new ecological communities. The study highlights the challenges in interpreting these processes due to the species-rich tropical fauna and human-induced disturbances, such as increased visitor numbers and volcanic activity. While both islands offer unique insights into ecological succession, Anak Krakatau's complex environmental influences complicate conservation efforts. This research underscores the need for robust monitoring and inventory studies to inform effective management strategies, contrasting the scenarios of terrestrial invertebrate conservation on these two iconic sites.
Ecosystem CO2 flux rates in relation to vegetation type and age of Leymus arenarius dunes on Surtsey
A study on the volcanic island of Surtsey reveals that belowground processes, such as soil respiration and root stocks, have significantly increased over 28 years despite stable aboveground vegetation cover. Leymus arenarius, a dominant plant species, exerts a stronger influence on CO₂ fluxes than its surface cover suggests due to higher photosynthesis rates compared to Honckenya peploides. The research highlights the importance of belowground development in primary succession and demonstrates how water stress can temporarily limit these processes in coastal ecosystems.
ISSR analysis of two founding plant species on the volcanic island Surtsey, Iceland: grass versus shrub
A comparative genetic analysis of two pioneering plant species on Surtsey, Iceland—Festuca rubra (arctic fescue) and Empetrum nigrum (crowberry)—reveals distinct colonization patterns despite similar levels of genetic diversity. Festuca, an early colonizer since 1973, exhibits significant subpopulation structure, suggesting expansion from a diverse local genepool, while the later-arriving crowberry (since 1993) shows no genetic differentiation, indicating a likely single-source origin. Using inter-simple sequence repeat (ISSR) markers, researchers analyzed DNA fragments from two census periods (1996–1997 and 2005–2006), uncovering temporal and spatial genetic structuring unique to each species. This study provides critical insights into the genetic dynamics of plant colonization on volcanic islands.
Microbial colonization in diverse surface soil types in Surtsey and diversity analysis of its subsurface microbiota
A study on Surtsey reveals that microbial colonization is significantly influenced by nutrient availability and environmental factors. The research found that bacterial counts were markedly higher in vegetated soils or pumice with bird droppings (1 × 106–1 × 109 cells g−1) compared to almost pure pumice (1 × 104–1 × 105 cells g−1). Faecal bacteria, including Enterobacteriaceae, were detected exclusively in vegetated samples and those with bird droppings. Notably, human pathogens like Salmonella, Campylobacter, and Listeria were absent. Subsurface analysis at depths of 145 and 172 meters identified thermophilic bacteria and archaea, though no growth was observed in enrichments. The microbiota sequences showed low affiliation to known 16S rRNA gene sequences, indicating novel or uncharacterized microbial diversity.
Observations on seals on the island of Surtsey in the period 1980-2012
A significant grey seal breeding site has been established on the northern spit of Surtsey, Iceland, with approximately 60 pups born in autumn 2012. This rookery is one of the largest on Iceland's southern coasts, contrasting with the limited presence of harbour seals during breeding seasons. However, harbour seals haul-out in large numbers on Surtsey's northern shores during winter, likely using it as a resting place after foraging in adjacent waters. The study surveyed both seal species along Icelandic coasts from 1980 to 2012, noting marked declines in their populations. Observations were conducted through systematic surveys, providing insights into the seals' breeding and haul-out behaviors in this unique volcanic island environment.
Soil nematode communities on Surtsey, 50 years after the formation of the volcanic island
Soil nematode communities on the volcanic island of Surtsey, 50 years after its formation, exhibit distinct patterns influenced by nutrient availability and soil conditions. The study identified 25 nematode genera, with 14 reported for the first time on Surtsey, revealing higher abundance in areas with strong allochthonous nutrient inputs (S2) compared to those with minimal external nutrients (S1). Nematode trophic structure varied significantly between the two sites, with bacterial- and plant-feeders dominating in S2, while hyphal-feeders were more prevalent in S1. Despite stable vegetation cover at S1 over 17 years, nematode communities continued to change, suggesting gradual shifts in soil environment. Resource availability emerged as a critical driver for nematode colonization during primary succession, though nematode community succession differed from that of plant communities.
The Surtsey Magma Series
Research on the Surtsey Magma Series reveals that the chemical composition of lavas from this iconic phreatomagmatic eruption evolved progressively, becoming more primitive over time. This variation is best explained by mixing different proportions of depleted ridge-like basalt and ponded, enriched alkalic basalt, similar to those found in Iceland's Eastern Volcanic Zone. However, the study also identifies a systematic offset in Nb/Zr ratios, suggesting that the end members used for this explanation are not fully represented in existing literature. The findings highlight processes occurring in ephemeral magma bodies on the extreme leading edge of a propagating off-axis rift near the Iceland plume, providing new insights into volcanic activity at the southwestern-most volcano in the Vestmannaeyjar.
Time-lapse characterization of hydrothermal seawater and microbial interactions with basaltic tephra at Surtsey Volcano
A groundbreaking International Continental Drilling Program (ICDP) project aims to drill through the 50-year-old Surtsey Volcano, Iceland's youngest volcanic island, to investigate hydrothermal and microbial interactions with basaltic tephra. This study builds on a 1979 drilling effort, focusing on the structure of Surtseyan volcanism, changes in fluid geochemistry, and microbial colonization since the last drilling. Researchers plan to install a subsurface observatory to monitor these processes long-term, providing insights into hydrothermal conditions and potential applications for specialty concretes using pyroclastic rock. The project, involving 24 scientists from 10 countries, was developed during a workshop on Heimaey Island in 2014.
Accumulation of nitrogen and organic matter during primary succession of Leymus arenarius dunes on the volcanic island Surtsey, Iceland
Research on Surtsey, Iceland, reveals that Leymus arenarius dunes accumulate nitrogen (N) and soil organic matter (SOM) at rates significantly exceeding atmospheric deposition, suggesting an efficient retention mechanism. Over 37 years, these dunes accumulated 6.6 kg N per hectare annually, 3.5 times more than atmospheric input, with root biomass playing a crucial role in this process. The study found that SOM accumulation was more strongly linked to soil nitrogen levels than time alone, indicating that areas with higher N concentrations may serve as hotspots for further ecological succession on the volcanic island. This insight challenges traditional views of nutrient limitation in primary succession and highlights the importance of root systems in nutrient retention during early ecosystem development.
Bryophyte colonization history of the virgin volcanic island Surtsey, Iceland
A study tracking bryophyte colonization on Surtsey, Iceland, revealed that 15 new species were discovered between 2008 and 1972, with eight species recorded for the first time. The research found that habitat loss due to erosion and vegetation changes led to the decline of some previously abundant species, while others thrived or expanded. Notably, several newcomers likely arrived via seagulls, suggesting bird-mediated dispersal plays a significant role in bryophyte colonization. The study also highlighted how nutrient leakage from a gull colony has locally reduced the importance of nitrogen fixation by cyanobacteria.
Effects of seabird nitrogen input on biomass and carbon accumulation after 50 years of primary succession on a young volcanic island, Surtsey
A study on Surtsey, Iceland, reveals that seabird nitrogen input significantly accelerates biomass and carbon accumulation during primary succession. Over 50 years, areas outside a seagull colony accumulated nitrogen at rates similar to low-input systems, while the colony's nutrient enrichment doubled ecosystem nitrogen-use efficiency and shifted stocks from belowground to aboveground. Despite this, soil organic carbon (SOC) remained far below typical grassland levels, indicating a prolonged recovery period for SOC equilibrium. The research compared shallow and deep tephra sands but found no significant difference in nitrogen retention, suggesting high potential for nutrient retention even in young volcanic soils.
New Proposed Drilling at Surtsey Volcano, Iceland
Proposed new drilling at Surtsey, an isolated oceanic island and UNESCO World Heritage Site, aims to deepen understanding of rift zone volcanism and hydrothermal alteration processes. This research builds on a 1979 drilling effort that explored deposits from the volcano's eruptions between 1963 and 1967, providing insights into biological colonization and succession in pyroclastic materials. The study seeks to advance knowledge of volcanic and geological dynamics while preserving Surtsey's unique environmental significance.
Plant colonization, succession and ecosystem development on Surtsey with reference to neighbouring islands
Seabirds, particularly seagulls and puffins, play a pivotal role in the development of volcanic island ecosystems by transferring nutrients from sea to land, significantly accelerating plant colonization, soil formation, and biodiversity. A study on Surtsey, a volcanic island formed in 1963, revealed that seabird colonies led to the establishment of dense grasslands with higher species richness, diversity, biomass, and soil carbon compared to low-impact areas. By 2013, Surtsey hosted 69 vascular plant species, more than twice as many as neighboring islands, with bird dispersal becoming the dominant pathway after 1985. However, long-term impacts of seabirds result in species-poor grasslands, similar to those found on older neighboring islands like Elliðaey and Heimaey. The research compared permanent plots on Surtsey, Elliðaey (puffin colony), and Heimaey (no seabirds) to assess plant succession, soil formation, and invertebrate communities, highlighting the contrasting effects of nutrient input on ecosystem development.
Spatial genetic structure of the sea sandwort ( Honckenya peploides ) on Surtsey: an immigrant's journey
Sea sandwort (Honckenya peploides) on Surtsey, Iceland, exhibits high genetic diversity and multiple colonization episodes. The study found that Surtsey's populations had the highest proportion of polymorphic markers (55.5%) and genetic diversity (0.1974 HE), suggesting rapid expansion or multiple immigrant origins during early colonization. Genetic differentiation among Surtsey populations was lower than mainland Iceland, indicating substantial gene flow on islands. Most variation (79%) occurred within localities, likely due to outcrossing and subdioecious nature. Significant genetic distance correlated with colonization age, pointing to multiple immigration events from Heimaey and southern Iceland. The research used AFLP markers on 347 plant samples, analyzing spatial genetic structure to uncover these insights.
Surtsey and Mount St. Helens: a comparison of early succession rates
Early ecological succession rates on Surtsey and Mount St. Helens, two distinct volcanic landscapes, reveal key mechanisms governing colonization and development. The study found that nutrient input from external sources—seabirds on Surtsey and windborne nutrients on Mount St. Helens—plays a critical role in accelerating succession, despite environmental constraints like bare lava or extreme exposure. Succession rates varied significantly across substrates, with gull colonies on fertile sands advancing faster than barren tephra or pumice plains. The research employed permanent plots, detrended correspondence analysis (DCA), and principal components analysis (PCA) to quantify changes in species composition and structure over time, offering insights into the broader principles shaping volcanic island ecosystems.
Melt inclusion constraints on the magma source of Eyjafjallajökull 2010 flank eruption
A 2010 flank eruption of Eyjafjallajökull volcano, Iceland, revealed that its magma source is linked to those of Katla and Surtsey basalts, with a dominant contribution from the Katla source. This finding was derived from analyzing melt inclusions (MIs) in olivine phenocrysts, which preserved primary magma compositions before ascent and differentiation. The study identified two basaltic end-members mixed during magma formation, with trace element data indicating significant proportions of recycled oceanic crust in their mantle sources. The compositional range of MIs (MgO 5.2–7.2 wt%) reflected binary mixing followed by fractional crystallization, providing rare insights into deep magmatic processes in Iceland.
Effects of seagulls on ecosystem respiration, soil nitrogen and vegetation cover on a pristine volcanic island, Surtsey, Iceland
Seagull colonization on Surtsey, Iceland, dramatically enhances ecosystem respiration and vegetation development. The study found that gull nests significantly increase soil nitrogen—primarily deposited by the birds—which boosts ecosystem activity to levels comparable to drained wetlands or agricultural fields in Iceland. Within the gull colony, ecosystem respiration was 59 times higher than outside it, with a temperature sensitivity (Q10 value) of 5.3. These effects were linked to increased soil carbon and nitrogen, reduced pH, and cooler soil temperatures. The research highlights how animal-mediated resource transfer can accelerate ecosystem formation on volcanic islands.
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