Publications
Canopy openings in the Trans-Mexican Neovolcanic Belt: Characteristics, distribution, and conservation relevance in a biosphere reserve
Canopy openings in the Monarch Butterfly Biosphere Reserve (MBBR) are more prevalent in core zones and Abies religiosa forests, with higher densities observed on gentle slopes and at extreme elevations. These openings, often linked to pest outbreaks, reflect a mix of natural and human-induced disturbances, particularly within ejidos where timber harvesting is permitted. The study used NDVI data and Google Earth imagery to quantify these patterns, revealing critical areas for conservation prioritization—such as core zones and A. religiosa forests—to safeguard forest integrity and monarch butterfly overwintering habitat.
Evolution of Scientific Knowledge on the Monarch Butterfly Biosphere Reserve
Scientific research on the Monarch Butterfly Biosphere Reserve (MBBR) has shown sustained growth and thematic diversity, with 106 unique articles published between 1997 and 2025. Mexico leads in scientific output, followed by the United States and Canada, with the National Autonomous University of Mexico (UNAM) as the most productive institution. The study identified six key research domains: conservation and environmental management, socioeconomic aspects and governance, forest ecology, research methodologies, monarch butterfly biology, and climatic and hydrological phenomena. Notably, 2020 was the most productive year, while 2014 saw the highest citation count. This bibliometric analysis provides critical insights to inform conservation policies and strengthen sustainable management of the MBBR.
High resolution thermal and multispectral remote sensing for detecting devitalized trees in Monarch Butterfly Biosphere Reserve
Researchers successfully demonstrated the use of high-resolution thermal and multispectral drone imaging to distinguish between healthy, devitalized, and dead oyamel trees (Abies religiosa) within the core zone of Mexico's Monarch Butterfly Biosphere Reserve. By integrating normalized difference vegetation index (NDVI), surface temperature (ST), and temperature-vegetation dryness index (TVDI) with field data, the study achieved statistically significant differentiation among tree health levels. This marks the first application of such technology in Mexico for monitoring forest decline symptoms in oyamel populations, setting a methodological precedent for conservation efforts.
Modeling Tourist Affinities and Mediated Loyalty in Protected Natural Areas Using Fuzzy Logic
A novel application of fuzzy logic reveals that tourist loyalty in the Monarch Butterfly Biosphere Reserve is indirectly shaped by affinity-based visitor structures, with significant forgotten effects (up to 0.30) acting as mediating mechanisms between satisfaction, entertainment, relaxation, learning, perceived value, and revisit intention. The study identifies Generation X and postgraduate education levels as key factors polarizing visitor perceptions, challenging conventional models that assume direct loyalty construction. This research underscores the potential of fuzzy logic for strategic management in high-value ecological destinations, advocating for environmental edutainment models and diversified marketing tailored to differentiated visitor profiles.
Post-fire tree regeneration in mixed-conifer forests of the Monarch Butterfly Biosphere Reserve, Mexico
Post-fire tree regeneration in mixed-conifer forests of the Monarch Butterfly Biosphere Reserve, Mexico, exhibits high variability depending on elevation and fire history. Research reveals three distinct recruitment patterns: asynchronous establishment of Abies religiosa followed by Pinus pseudostrobus at higher elevations (3150 m), synchronous recruitment of both species at intermediate elevations (3100 m) following multiple fires, and exclusive regeneration of P. pseudostrobus and broad-leaved species at lower elevations (3050 m). The study analyzed tree-ring data from 258 trees across three sites to assess post-fire dynamics, finding that wet inter-annual periods did not significantly enhance recruitment. These findings underscore the complex interplay between fire, elevation, and species dominance, providing critical insights for forest management strategies in this ecologically significant region.
Using UAV (drone) technology to measure the dynamics of Abies religiosa (Kunth) Schltdl. & Cham. decline in the Monarch Butterfly Biosphere Reserve, Mexico, and its relationship to climate change
A significant decline in the health of Abies religiosa trees within Mexico's Monarch Butterfly Biosphere Reserve (MBBR) was linked to extreme drought conditions exacerbated by climate change. Using UAV technology, researchers detected a sharp drop in tree vigor—measured via NDVI and a new Monthly Dryness Index (MDI)—during a June 2023 heat wave (+2.7°C anomaly), with healthy trees plummeting from 37% to 18%. Regression models confirmed MDI's strong predictive power (R² ≥ 0.94) for tree vitality shifts, underscoring the species' vulnerability during dry seasons. This study highlights how drone-based remote sensing can track climate impacts on ecosystems in real time.
Altitudinal distribution, diversity, and conservation of pines and oaks in the Monarch Butterfly Biosphere Reserve, Mexico
Research reveals that the distribution and diversity of pine (Pinus) and oak (Quercus) species in Mexico's Monarch Butterfly Biosphere Reserve are significantly influenced by human activities, such as logging and agriculture. The study found that while alpha diversity did not vary with elevation, beta diversity exhibited an inverted hump pattern at both high and low elevations, likely due to anthropogenic disturbances. Pinus pseudostrobus and Quercus laurina emerged as the dominant species, with the least abundant species showing the most restricted geographic ranges. To analyze these patterns, scientists established six elevation transects (2,250–3,300 m above sea level) with 32 points spaced 150 meters apart, recording 25 trees per site with a diameter at breast height of at least 10 cm. This work underscores the need for targeted conservation strategies to preserve the biodiversity and ecosystem services provided by these crucial tree species.
Expansion of avocado monoculture threatens the overwintering habitat of monarch butterflies in central Mexico
By 2024, avocado monoculture had encroached upon 1345 ha of Mexico’s Monarch Butterfly Biosphere Reserve—337 ha of it former pine-oak forest—threatening the overwintering habitat of migratory monarch butterflies. Modeling under current and future climate scenarios (low- and high-emission) projects that suitable avocado cropping area will rise from 5076 ha today to 10 395 ha by 2070, shifting upslope and imperiling nectar sources while increasing pesticide use. Although sacred fir and mixed-conifer forests remain intact for now, their long-term viability hinges on curbing monoculture expansion and adopting sustainable avocado practices.
Hydrothermally Altered Rocks and Their Implications for Debris Flow Generation in the Monarch Butterfly Biosphere Reserve, Mexico
Hydrothermally altered andesitic breccia with significantly weakened geomechanical properties—exhibiting a compressive strength of just 0.47 ± 0.05 MPa—was identified as the critical factor triggering debris flows in the Canoas microbasin within Mexico's Monarch Butterfly Biosphere Reserve. Unlike unaltered andesite (36.26 ± 18.62 MPa), the altered rock displays soil-like characteristics, high clay and silt content, and susceptibility to saturation collapse during heavy rainfall. Fieldwork and petrographic analysis revealed extensive replacement of phenocrysts by sericite, kaolin, iron oxides, and clays, underscoring hydrothermal alteration as a key control for slope instability in volcanic regions. These findings provide critical insights for geological risk management in mountainous areas.
Monarch butterfly biosphere reserve: antecedent dimensions of loyalty in an environment of co-creation of experiences
A study on the Monarch Butterfly Biosphere Reserve reveals that visitor satisfaction and commitment to the destination are critical for fostering loyalty, with experience value playing a pivotal role in enhancing satisfaction. The research analyzed 316 questionnaires from tourists using SPSS 24 and IBM SPSS Amos 28, demonstrating that co-creation of experiences significantly influences behavioral intentions such as revisiting and recommending the site. This novel analysis bridges gaps in understanding visitor behavior in biosphere reserves, offering actionable insights for destination management and marketing strategies.
Protecting forests, losing trees: the role of community involvement
Despite its protected status, nearly half of the Monarch Butterfly Biosphere Reserve (MBBR) experienced forest degradation after conservation decrees, with pre-emptive clearing by communities contributing to deforestation. However, later periods saw forest recovery driven by payment for environmental services and community participation. The study, using multi-temporal data including aerial photographs and satellite imagery, found that illegal logging reduced essential fir forests by 43.3%, highlighting the critical role of community involvement in mitigating environmental impacts and ensuring conservation success.
Sanitary Logging in the Monarch Butterfly Biosphere Reserve: One Problem, One Legislation but Different Criteria and Different Treatments
A stark discrepancy exists in the management of bark beetle outbreaks within the Monarch Butterfly Biosphere Reserve, driven by differing criteria and treatments despite shared federal legislation. While Michoacán reports a high incidence rate of 41 outbreaks per km²—triggered even by a single infested tree—Estado de México's stricter threshold (three or more trees) results in just 1.5 outbreaks per km². This study, employing qualitative analysis through 21 semi-structured interviews, reveals that the differences stem from local administrative and technical procedures, exposing potential legal inadequacies. The findings underscore the need for unified, conservation-focused strategies to address bark beetle management, rather than relying solely on sanitary logging, which may be influenced by non-conservation interests.
Terrestrial Laser Scanning for Estimating the Volume and Biomass of Coniferous Stems in the Mariposa Monarca Biosphere Reserve, Mexico
Terrestrial laser scanning (TLS) emerges as a powerful, non-destructive tool for accurately estimating tree volume and biomass, offering a significant advancement over traditional methods that are labor-intensive and often destructive. A study in the Monarch Butterfly Biosphere Reserve (MBBR), Mexico, demonstrated that TLS-derived stem volume estimates (Vol_TLS) closely matched those from predictive models based on destructive sampling, with no significant differences found. The relationship between Vol_TLS and a model-based volume (Vol_TModel) showed an exceptionally strong fit (R² = 0.97, RMSE = 0.351 m³), outperforming another model comparison (R² = 0.93, RMSE = 0.537 m³). This validation highlights TLS as a reliable alternative for forest biomass assessment, particularly in ecologically sensitive areas like the MBBR, where conservation is paramount.
"Living in the time of the butterfly:" Engaging more-than-human temporalities to rethink biodiversity conservation
Indigenous Jñato and Hñähñu (Mazahua and Otomi) peoples' ecological narratives challenge linear conceptions of time, revealing cyclical multispecies temporalities that operate through reciprocal relations between humans, plants, water spirits, and witches. This study, conducted over multiple years through historical and ethnographic research in Mexico's Monarch Butterfly Biosphere Reserve, demonstrates how 'deep time' perspectives—rooted in Indigenous knowledge—can enrich biodiversity conservation by centering relational, more-than-human political ecologies. The findings highlight the power-laden nature of these temporalities, embedded within complex political economies and uneven knowledge production, which the authors term 'the time of the butterfly.' This work urges conservation scholars to reconsider epistemological assumptions about time and the Anthropocene, offering a framework that integrates Indigenous worldviews with ecological practice.
Dendrogeomorphological analysis of a debris flow in the Monarch Butterfly Biosphere Reserve, central Mexico
A dendrogeomorphological analysis reveals that the debris flow event in the Monarch Butterfly Biosphere Reserve, central Mexico, in February 2010 exhibited greater intensity in its transport zone. Researchers identified three types of growth anomalies—traumatic resin ducts, growth suppression, and growth releases—in Abies religiosa trees, which provided spatio-temporal data on the debris flow activity. The study utilized precipitation records from two meteorological stations, high-resolution geomorphological mapping via Unmanned Aerial Vehicle imagery, and dendrochronological sampling of 98 trees (125 cores) to generate a chronology. This approach demonstrates the potential of dendrogeomorphological techniques in understanding debris flow dynamics in intertropical montane environments, particularly where data on mass movement processes is scarce.
Establishing monarch butterfly overwintering sites for future climates: Abies religiosa upper altitudinal limit expansion by assisted migration
Research demonstrates that expanding the range of Abies religiosa (oyamel) to higher elevations is feasible, offering potential new overwintering sites for the Monarch butterfly under future climate conditions. The study found acceptable survival rates (44-68%) at elevations up to 4000 meters, though growth was limited at extreme sites. By analyzing transfer effects and environmental factors like annual dryness index, scientists projected that shifting populations by approximately 500 meters upward could mitigate the impacts of a 2.3°C increase in mean annual temperature expected by 2060. These findings suggest that establishing A. religiosa stands at 3600 and 3800 meters could serve as future overwintering habitats, though survival and growth would be lower than current conditions.
Local adaptation of Pinus leiophylla under climate and land use change models in the Avocado Belt of Michoacán
Research identifies the Monarch Butterfly Biosphere Reserve and surrounding eastern regions of Michoacán's Avocado Belt as critical conservation priorities for Pinus leiophylla, a tree species threatened by climate change and land use conversion. Using landscape genomics, scientists analyzed 3660 SNPs to pinpoint genetic adaptations across 19 localities, revealing that central-eastern areas face heightened vulnerability to climate shifts while western regions suffer from avocado orchard expansion. The study also highlights the potential of assisted gene flow strategies to mitigate these threats and emphasizes maintaining connectivity in forest patches, particularly in eastern zones. This work provides a robust framework for assessing tree population responses to dual anthropogenic pressures.
Local Perception of Traditional and Avocado Crops as Ecosystem Services in the Mariposa Monarch Biosphere Reserve
Local perceptions of traditional and avocado crops as ecosystem services vary significantly within the Monarch Butterfly Biosphere Reserve, influenced by daily activities, livelihoods, and proximity to protected zones. The study found contrasting feelings toward these crops, with avocado monocultures—expanding rapidly at the expense of native forests—often viewed negatively due to their environmental impact. Traditional crops, meanwhile, are associated with more sustainable practices and positive ecological outcomes. These findings highlight the complex interplay between human livelihoods and ecosystem conservation, offering critical insights for inclusive management strategies that balance local needs with biodiversity protection.
Sustainability of the community model of avocado production in the Monarch Butterfly Biosphere Reserve, Michoacán, México
A recent study reveals that the Community Model of Avocado Production (CMAP) in five indigenous communities within Mexico's Monarch Butterfly Biosphere Reserve shows promise for sustainable avocado cultivation without compromising forest conservation. The research, conducted through 42 interviews with producers and using a sustainability framework, identified critical points across environmental, economic, and social dimensions. While the CMAP supports local employment and land ownership, its economic viability is hindered by factors such as low profitability and high yield loss to pests. However, with targeted economic support for sustainable practices, the model could enhance livelihoods while preserving the reserve's ecological integrity.
The Many Care Worlds a Butterfly Crosses
This study reveals the contrasting care practices for monarch butterflies, highlighting tensions between northern conservation efforts led by volunteers and southern approaches rooted in Indigenous and mestizo communities. The research demonstrates that while northern conservation relies on voluntary habitat creation and economic contributions, southern residents experience this as a top-down imposition, emphasizing forest relations instead. Through ethnographic data, the study explores how these differing care worlds intersect with colonial dynamics, illustrating distinct perceptions of urgency in conserving nature. It contributes to the 'one planet, many worlds' debate by examining how a disappearing butterfly confronts and constitutes different conservation ideologies.
Biodiversity of riparian vegetation under a management gradient in the Monarch Butterfly Biosphere Reserve, Mexico
Riparian vegetation within the Monarch Butterfly Biosphere Reserve (MBBR) exhibits high biodiversity and conservation value, particularly in core and buffer zones. A study analyzing 15 sites across land-use gradients revealed that while species richness and alpha diversity were consistent, beta diversity varied significantly with human disturbance. The research identified 108 native species, with only 2% exotic, underscoring the critical role of riparian systems in ecosystem health. By leveraging high-resolution imagery to categorize protection status and land use, the study highlights the importance of integrating human-land interactions into conservation strategies for UNESCO sites like the MBBR.
Forest land-cover trends in the Monarch Butterfly Biosphere Reserve in Mexico, 1994–2017
Despite economic incentives to protect the Monarch Butterfly Biosphere Reserve, forest cover has not significantly recovered since 1994. A comparison of orthophotographs from 1994 and high-resolution satellite images from 2017 revealed only a 2% increase in forest area, while deforested areas expanded by 5% in the core zone. The study highlights that consensus among agrarian communities is crucial for effective conservation on socially owned lands. This research underscores the challenges of balancing economic incentives with environmental protection and community agreement.
Rapid assessment remote sensing of forest cover change to inform forest management: Case of the Monarch reserve
A rapid remote sensing approach demonstrates that forest cover loss in the Monarch Butterfly Biosphere Reserve (MBBR) has decreased while forest cover gains have increased, providing a baseline for monitoring and assessing the impacts of conservation interventions. This method, utilizing GIS analysis from 2006 to 2015, offers a non-invasive tool for tracking changes across four agrarian nuclei, facilitating collaboration with local managers and encouraging broader participation in conservation efforts. The study highlights the potential of remote sensing to support forest management and ecosystem resilience in human-natural systems.
What do monarchs feed on in winter? Nectar sources at hibernation sites
Monarch butterflies, despite long-held beliefs, actively feed on nectar during their overwintering period in Mexico’s Monarch Butterfly Biosphere Reserve. A systematic study identified 29 plant species—primarily white, yellow, or blue-flowered and winter-blooming—as key nectar sources, with Salvia mexicana and S. plurispicata being the most visited. Individual plants like Prunus serotina and Crataegus mexicana also attracted significant attention. These findings suggest that promoting such species in agricultural areas could support monarch conservation by mitigating reserve decline in disturbed forests.
Avocado Cover Expansion in the Monarch Butterfly Biosphere Reserve, Central Mexico
A total of 958 hectares within the Monarch Butterfly Biosphere Reserve (MBBR) are now covered by avocado plantations, with the southern zone hosting the largest area (570 ha) and the northern zone showing the highest expansion rate (422%) between 2006 and 2018. This study identified avocado orchards through photo interpretation, analyzing topographic attributes such as elevation, soil type, slope, and aspect. Most plantations have replaced traditional agricultural lands, but deforestation accounted for 40 hectares, particularly in the central zone. The expansion threatens the overwintering habitat of monarch butterflies, potentially impacting their migratory phenomenon.
Managing with logic: A Bayesian causal network assessment using the critical list of variables for sustaining the commons in the Monarch Reserve
A Bayesian causal network analysis of the Monarch Butterfly Biosphere Reserve reveals that small size and well-defined boundaries—both in resource systems and social groups—are critical to sustainable forest management success, even when full compliance with theoretical best practices is not achieved. The study used a combination of the critical list of variables for sustaining the commons and Bayesian causal networks (BCNs) to assess four successfully managed sites within the reserve. Despite threats from urban sprawl and climate change, all sites maintained forest cover loss below 0.03%, demonstrating that strict adherence to theoretical frameworks is unnecessary for effective conservation outcomes. This approach offers a scalable model for strategic interventions in common pool resource management.
Physical-mechanical behavior of fresh and completely altered rocks as an important factor of slope instability in the El Rosario Monarch Butterfly Sanctuary, Michoacán, Mexico
Slope instability in the El Rosario Monarch Butterfly Sanctuary, part of Mexico's Monarch Butterfly Biosphere Reserve, is primarily driven by rock alteration and steep terrain. Research reveals that altered rocks exhibit significantly higher porosity (60.9%) and permeability (393.71 mD), with drastically reduced uniaxial compressive strength (0.26 MPa) compared to fresh rocks (17.1% porosity, 0.262 mD permeability, 63.5 MPa). These degradation processes, combined with slopes exceeding 30 degrees and atypical rainfall events, act as critical triggers for slope failures in the region. The study employed laboratory tests to characterize physical-mechanical properties of lower Miocene andesitic lavas from Sierra de Angangueo, providing empirical evidence linking rock alteration to landslide susceptibility in this ecologically significant area.
Reciprocal Common Garden Altitudinal Transplants Reveal Potential Negative Impacts of Climate Change on Abies religiosa Populations in the Monarch Butterfly Biosphere Reserve Overwintering Sites
Climate change is projected to cause severe mortality in young Abies religiosa seedlings within the Monarch Butterfly Biosphere Reserve (MBBR), with a 400 m upward altitudinal shift appearing as a feasible management action. This study used reciprocal altitudinal transplants of A. religiosa seedlings across three contrasting altitudes (3400, 3000, and 2600 m a.s.l.) to assess the impacts of climatic mismatch on survival and growth. Findings indicated that transferring seedlings to warmer, drier sites resulted in approximately 45% mortality, whereas shifting to colder, wetter sites maintained near 95% survival. The study highlighted the critical role of seasonal dryness indices in determining seedling performance, with the rainy season index being crucial for survival and the cold-dry season index influencing aerial biomass growth.
Abies religiosa Seedling Limitations for Passive Restoration Practices at the Monarch Butterfly Biosphere Reserve in Mexico
Passive restoration of the sacred fir (Abies religiosa) forest within Mexico's Monarch Butterfly Biosphere Reserve is highly constrained by environmental factors, particularly soil moisture and moss thickness during dry, warm periods. Research found that seedling mortality reached 49.2% by the end of the dry season in June 2016, with the highest monthly mortality (14.3%) occurring in April—a critical period marked by low soil moisture and thin moss layers. While moss did not negatively impact seedling survival, it helped mitigate soil moisture loss during this vulnerable time. Seedling recruitment was also higher at intermediate elevations (3050–3300 m a.s.l.) compared to higher elevations, suggesting that climate change could further exacerbate these challenges. The study evaluated 53 sites along an elevational gradient in 2015 and tracked seedling mortality in 2016, revealing that natural regeneration alone is insufficient for effective restoration without targeted management interventions.
Modification of Fire Regimes Inferred from the Age Structure of Two Conifer Species in a Tropical Montane Forest, Mexico
Research in the Monarch Butterfly Biosphere Reserve reveals that fire regimes in tropical montane forests are characterized by frequent, low-severity, and low-intensity fires. This conclusion is drawn from the uneven-aged structure of stands dominated or co-dominated by smooth-bark Mexican pine (Pinus pseudostrobus) and sacred fir (Abies religiosa), which exhibit continuous tree establishment patterns across an altitudinal gradient. The study used increment cores collected from 25 mature trees at six altitudinal transects, ranging from 2400 to 3300 meters, with a total of 800 samples cross-dated to reconstruct tree establishment history. Findings suggest that while natural fire regimes may have been disrupted by human activities, limiting high-severity fires, these forests retain distinctive features shaped by their unique fire dynamics.
Policy Implementation Halts Deforestation in Winter Habitat of Monarch Butterflies in Mexico
A recent analysis reveals that deforestation due to logging in the core zones of Mexico's Monarch Butterfly Biosphere Reserve (MBBR) is no longer a significant factor in the decline of overwintering monarch butterfly populations. Despite dramatic population decreases, forest cover loss from logging has drastically reduced since 2011, coinciding with the implementation of strict conservation policies and economic incentives for local communities. The study attributes this success to collaborative efforts involving governmental agencies, NGOs, and academia, which have curbed illegal logging and increased social awareness. However, salvage logging from storms remains a concern, and broader threats such as habitat loss due to agricultural practices, disease, climate change, and pesticide use continue to endanger monarch populations.
Recent evidence of Mexican temperate forest decline and the need for ex situ conservation, assisted migration, and translocation of species ensembles as adaptive management to face projected climatic change impacts in a megadiverse country
Recent research highlights significant decline in Mexico's temperate forests, particularly along the Trans-Mexican Volcanic Belt and at lower elevations, attributed to climate change impacts. The study documents severe mistletoe infestations affecting Pinus hartwegii, reduced seedling recruitment of Abies religiosa, signs of inbreeding and defoliation in endangered Picea species, and increased pest and disease outbreaks in conifers and oaks. These findings challenge the assumption that natural genetic variation alone can sustain forest ecosystems under projected climate scenarios. The authors propose adaptive management strategies, including ex situ conservation, assisted migration, and translocation of species ensembles, to mitigate climate change impacts on Mexico's megadiverse temperate forests.
Dendrochronological reconstruction of fire history in coniferous forests in the Monarch Butterfly Biosphere Reserve, Mexico
Coniferous forests within the Monarch Butterfly Biosphere Reserve (MBBR) experience frequent fires, with return intervals averaging two years across all elevations and forest types. Contrary to expectations, these fires do not correlate with drought or El Niño Southern Oscillation (ENSO) events, nor do they influence tree establishment patterns, which remain continuous regardless of fire frequency. The study, using dendrochronological techniques on 110 cross-sections from 23 sites spanning 1925–2015, suggests that natural fire regimes in these forests may have been drastically altered by human activities. While frequent low-severity fires could potentially harm tree regeneration and the integrity of the monarch butterfly's overwintering habitat, continuous tree regeneration indicates such impacts have not yet materialized.
Ecological Restoration of Abies religiosa Forests Using Nurse Plants and Assisted Migration in the Monarch Butterfly Biosphere Reserve, Mexico
Assisted migration of Abies religiosa (sacred fir) combined with nurse plants significantly improves afforestation success in the Monarch Butterfly Biosphere Reserve, Mexico. Research found that seedlings planted under existing nurse plants exhibited survival rates of 72% and 94% at two sites, compared to just 18% and 10% in open areas without shade protection. The study also demonstrated that transferring tree populations 400 meters upward in elevation—an approach known as assisted migration—does not negatively impact seedling growth, potentially aligning them better with future climate conditions. These findings suggest that incorporating nurse shrubs like Baccharis conferta into reforestation strategies can enhance ecological restoration efforts, particularly in high-elevation regions vulnerable to climate change.
Is the Timing, Pace, and Success of the Monarch Migration Associated With Sun Angle?
Monarch butterflies' fall migration to Mexico is influenced by the sun's position, with successful migrants adhering to a 'migration window' defined by the daily maximum vertical angle of the sun (SASN). This study analyzed over 1.38 million tagged monarchs from 1998 to 2015, revealing that those reaching overwintering sites typically migrated within an SASN range of 46° to 57°. The migration follows a slow-fast-slow pattern, consistent with monarchs targeting latitudes with matching SASN. Migration timing may impact population success, as years with low overwintering abundance showed higher late migrant percentages. The findings suggest environmental factors like temperature and daylength interact with SASN to shape migration dynamics.
Multiscale seasonal factors drive the size of winter monarch colonies
A significant decline of 84% in eastern North American monarch butterfly populations on Mexican wintering grounds since 1996 contrasts with stable population indices from northern breeding areas, suggesting autumn migration as a critical bottleneck. This study reveals that multiscale factors—including higher summer abundance on breeding grounds, greener autumns indicating increased nectar availability, and local dense forest cover within the Monarch Butterfly Biosphere Reserve—positively influence winter colony sizes. Unlike previously assumed, disease rates did not affect colony sizes. The research highlights the importance of evaluating migratory conditions to understand long-term population trends, emphasizing the vulnerability of monarchs under climate change due to diminished floral resources and winter habitat availability.
Orange, black, and a little bit of white is the new shade of conservation: the role of tourism in Monarch Butterfly Conservation in Mexico
Tourism and conservation are intricately linked in the management of Mexico's Monarch Butterfly Biosphere Reserve, where annual visitor influxes to witness monarch butterfly overwintering present both opportunities and challenges. An ethnographic study revealed that current tourism infrastructure—including trails, signage, visitor management, and educational strategies—effectively mitigates anthropogenic impacts while enhancing conservation efforts. The research highlights the need for refined strategies to balance ecological protection with immersive visitor experiences, offering actionable recommendations to sustain this iconic protected area.
Recent Forest Cover Loss in the Core Zones of the Monarch Butterfly Biosphere Reserve in Mexico
A dramatic 98% reduction in large-scale illegal logging has occurred in the core zones of Mexico's Monarch Butterfly Biosphere Reserve (MBBR) between 2012 and 2018, according to a new study. Researchers analyzed aerial ortho-photographs and satellite images, validated with fieldwork, to quantify forest cover loss—totaling 163.44 hectares—with climate-related factors (rain and wind) accounting for the majority (125.44 ha), while illegal logging (both large-scale and small-scale) contributed significantly less (38.0 ha and 12.14 ha, respectively). The findings suggest that despite ongoing threats, forest loss in the monarch's winter habitat is not the primary driver of their population decline since 2010, which has been far more severe than expected.
Spatio-Temporal Distribution of Monarch Butterflies Along Their Migratory Route
A first predictive model of monarch butterfly distributions along their migratory route reveals critical seasonal patterns and habitat suitability, offering new insights for conservation efforts. The study found that suitable habitats expand significantly during North American reproduction months (June to September) but shrink dramatically during overwintering (December to February). Edaphic variables, such as vegetation and floral resources, emerged as key factors in 11 of 12 months, underscoring the importance of nectar-rich plants. The research compiled georeferenced records from Mexico, USA, and Canada, using habitat suitability models (HSM) with abiotic, edaphic, and topographic data to identify high-priority areas for conservation actions like pesticide reduction and road safety measures.
Suitable climatic habitat changes for Mexican conifers along altitudinal gradients under climatic change scenarios
By 2060, Mexican montane conifers will face significant habitat loss—up to 77%—with the highest elevations hit hardest. Five dominant species, including Abies religiosa (the Monarch butterfly's overwintering host), may need human assistance to migrate upward as their climate niches shift 300–500 meters higher. Using bioclimatic modeling with Random Forests and climate projections from 17 general circulation models under RCP 6.0, researchers found that traditional conservation efforts will be insufficient without active intervention.
An ecological auto-ethnography of a monarch butterfly
Monarch butterflies face severe habitat loss and degradation due to industrial agriculture expansion, threatening their survival. This study highlights the impact of monocultures on ecological diversity and stability, contrasting with the protected Monarch Butterfly Biosphere Reserve in Mexico, which safeguards 56,259 hectares, including critical wintering forests spanning 13,551 hectares. The research employs an ecological auto-ethnography approach, documenting the species' annual migration from North America to Michoacán and Estado de México while analyzing regulatory challenges and environmental pressures. It underscores the vulnerability of monocultures to ecological catastrophes and their role in accelerating species extinction, emphasizing the need for habitat preservation to sustain monarch populations.
Climatic Signal in Earlywood and Latewood in Conifer Forests in the Monarch Butterfly Biosphere Reserve, Mexico
Tree ring analysis reveals that the growth of conifer species Abies religiosa and Pinus pseudostrobus in Mexico's Monarch Butterfly Biosphere Reserve is highly sensitive to seasonal climate variations. Precipitation during late autumn (October-December) and spring (January-May) positively influences their growth, while higher mean maximum temperatures negatively impact it. Notably, A. religiosa shows greater sensitivity to temperature changes compared to P. pseudostrobus, with its earlywood and latewood growth positively correlated with monthly minimum temperatures. The study suggests that future warmer and drier climates could severely reduce the growth of A. religiosa, potentially threatening the overwintering habitat of the monarch butterfly (Danaus plexippus L.). This research underscores the vulnerability of these conifer forests to climate change, highlighting their ecological importance.
Modeling anthropic factors as drivers of wildfire occurrence at the Monarch Butterfly Biosphere
In the Monarch Butterfly Biosphere Reserve, wildfire occurrence is significantly driven by anthropic factors such as population density and forest edge proximity. A study modeling fire events from 2009 to 2013 revealed that areas with higher human presence and fragmented forests are more prone to fires, with a predictive model accuracy of AUC = 0.71 when validated against 2014-2015 data. The research highlights the need for targeted fire management strategies in high-risk zones, particularly those near populated areas or forest edges, while suggesting future models incorporate direct fuel measurements for improved precision.
Quantifying active and passive restoration in Central Mexico from 1986–2012: assessing the evidence of a forest transition
Between 1986 and 2012, the Monarch Butterfly Biosphere Reserve in Central Mexico experienced a net increase of 3,798 hectares of forest, yet this recovery is slowing. A study combining satellite imagery analysis with field interviews (n=43) revealed that most of this regrowth—estimated between 58 and 429 hectares—was due to natural regrowth (passive reforestation) on previously degraded lands rather than active reforestation efforts. Reduced logging and grazing pressures were key drivers, while agricultural abandonment had less influence than previously thought. The findings suggest prioritizing investments in maintaining forest resilience over costly reforestation programs.
Butterfly Mortality and Salvage Logging from the March 2016 Storm in the Monarch Butterfly Biosphere Reserve in Mexico
A severe late spring storm in March 2016 caused significant mortality among monarch butterflies in the Monarch Butterfly Biosphere Reserve, Mexico, with estimates of 31–38% mortality in Sierra Chincua and Cerro Pelón colonies and over 40% in the Rosario colony—marking a five-fold increase compared to previous reports. The storm's high-velocity winds disrupted the thermal protection provided by the Oyamel fir forest, exposing butterflies to lethal freezing conditions. Additionally, extensive salvage logging followed the storm, further threatening the microclimatic stability of the Reserve. This event highlights potential climate-related vulnerabilities in the region.
Genetic Variation in Abies religiosa for Quantitative Traits and Delineation of Elevational and Climatic Zoning for Maintaining Monarch Butterfly Overwintering Sites in Mexico, considering Climatic Change
Researchers have identified three distinct elevational and climatic zones for the optimal collection of Abies religiosa (sacred fir) seeds, crucial for sustaining Monarch Butterfly overwintering sites in Mexico. These zones are defined by specific elevation ranges and Mean Temperature of the Coldest Month (MTCM), with boundaries at 2650 masl or 9.7 °C, 3000 masl or 8.5 °C, 3350 masl or 7.3 °C, and 3700 masl or 6.1 °C. The study found significant genetic variation among A. religiosa populations along an elevational gradient (2850-3550 masl), with populations differing by as little as 364 meters in elevation showing distinct traits such as growth rate, frost damage resistance, and dry weight. Projections suggest that these zones will shift upwards by 350 meters by 2030 due to climate change, potentially exceeding the current highest elevations within the Monarch Butterfly Biosphere Reserve (MBBR). This necessitates the establishment of A. religiosa stands outside the MBBR to serve as future overwintering sites. The research involved a common garden experiment with seedlings from fifteen populations, evaluated over 30 months for various quantitative traits, providing critical insights for adaptive management strategies.
Flora of the core zones of the Monarch Butterfly Biosphere Reserve, Mexico: composition, geographical affinities and beta diversity
The core zones of the Monarch Butterfly Biosphere Reserve (MBBR) in Mexico harbor a rich and diverse flora, with 694 plant species identified across three core areas: Cerro Altamirano, Cerro Pelón, and Chincua-Campanario-Chivati. Notably, about 38% of these species are endemic to Mexico, underscoring the region's unique biodiversity. The study, conducted between 2000 and 2006, found that forests dominated by Quercus and Abies exhibited the highest species diversity, while herbaceous plants were the predominant growth form (ca. 75%). High beta diversity values (Jaccard index 0.03 to 0.11) indicated significant floristic variation among the core zones, with over half of the documented species (66.3%) found exclusively in one zone. These findings highlight the complementary nature of the core zones for plant conservation and emphasize their importance as critical habitats for migrating Monarch butterfly populations.
Illegal Logging of 10 Hectares of Forest in the Sierra Chincua Monarch Butterfly Overwintering Area in Mexico
A significant illegal logging operation was uncovered in the Sierra Chincua overwintering area of Mexico's Monarch Butterfly Biosphere Reserve, affecting 10 hectares of forest. The discovery, initially reported by a local environmentalist in May 2015 and later confirmed through satellite imagery, highlighted severe deforestation within the core zone of this UNESCO World Heritage Site. Government authorities arrested 35 loggers and confiscated 147 cubic meters of wood between March and May 2015, though the exact location remained undisclosed until January 2016. The study relied on satellite imagery, media reports, and communications with local stakeholders to document the incursion, emphasizing its potential negative impact on the monarch butterfly's spring remigration.
Population Genetics of Overwintering Monarch Butterflies,Danaus plexippus(Linnaeus), from Central Mexico Inferred from Mitochondrial DNA and Microsatellite Markers
A study reveals significant genetic differentiation between migratory and nonmigratory populations of monarch butterflies, Danaus plexippus, in Mexico. Using mitochondrial DNA (COI and COII) and microsatellite markers, researchers found low haplotype diversity and limited gene flow between the behaviorally distinct groups, despite similarities in haplotype frequencies between nonmigratory populations from distant locations like Mexico and Costa Rica. Demographic analyses suggest a population expansion during the late Pleistocene (~35000-40000 years ago), followed by stability with an effective female population size of around 6 million over the last 10,000 years. Microsatellite data, however, showed no clear structure between groups, possibly due to heterozygote deficiencies.
Social dimensions of child tourism labour: listening to children's voices in two Mexican rural communities
Children in Mexico's Monarch Butterfly Biosphere Reserve actively engage in remunerable tourism labour during the season, contributing to their livelihoods and development while facing risks of physical harm and health issues. This study, based on children's own accounts, reveals that such participation also reinforces traditional gender roles. Conducted through qualitative methods centered on child informants, the research highlights the need for comprehensive understanding of tourism's social dimensions, offering practical and methodological insights to address these complexities.
The importance of the traditional fire knowledge system in a subtropical montane socio-ecosystem in a protected natural area
A robust traditional fire knowledge system exists within the Monarch Butterfly Biosphere Reserve (MBBR) in Mexico, contradicting the common perception that local practices contribute to forest fires. This study identifies nine types of fire uses, with 'mound burns' being the most prevalent for agricultural weed management. Local inhabitants possess detailed understanding of geophysical and ecological factors influencing fire behavior, which is transmitted orally and through daily practices from parents to children. Social rules are embedded within this system to mitigate risks of uncontrolled fires. The findings highlight a dynamic traditional knowledge system that has adapted to the region's evolving socio-ecological context over decades.
Opportunities, constraints and perceptions of rural communities regarding their potential to contribute to forest landscape transitions under REDD+: case studies from Mexico
Rural communities in Mexico's Monarch Butterfly Biosphere Reserve and surrounding regions face significant challenges in participating effectively in REDD+ (Reducing Emissions from Deforestation and Forest Degradation) despite its potential benefits. While opportunities exist for reduced forest degradation and enhancement, establishing additionality—proving that REDD+ activities would not have occurred without the program—remains difficult. Community size, land rights, and limited information about eligible activities and financial rewards hinder their ability to assess REDD+'s viability. Communities largely expect it to follow Mexico's existing Payment for Environmental Services model, but current gaps in transparency and understanding may deter broader participation.
Dynamics and trends of overwintering colonies of the monarch butterfly in Mexico
Monarch butterfly overwintering colonies in Mexico have experienced a significant decline, with the surface area occupied by butterflies dropping 44% between the 2012–2013 and 2013–2014 seasons—reaching the smallest recorded level in two decades. Only three of the 19 monitored colonies showed consistent presence throughout all seasons, while the total cumulative forest area used by monarchs was 106.53 hectares, with 83.68% within the Monarch Butterfly Biosphere Reserve. This decline is attributed to habitat loss due to herbicide use and land-use changes in the U.S., extreme climate conditions across North America, deforestation in Mexico, and unregulated tourism. The study underscores the urgent need for protection and restoration of overwintering sites and migratory habitats to conserve this iconic species.
Trends in Deforestation and Forest Degradation after a Decade of Monitoring in the Monarch Butterfly Biosphere Reserve in Mexico
From 2001 to 2012, conservation efforts significantly reduced large-scale illegal logging in the Monarch Butterfly Biosphere Reserve, Mexico, from 731 hectares affected annually to none by 2012. However, small-scale logging persists as a growing concern. The study used aerial photographs, satellite images, and field surveys to monitor forest cover changes, revealing that 2,179 hectares were deforested or degraded during this period, with illegal logging being the primary driver. While enforcement by Mexican authorities and financial support for alternative income generation proved effective against large-scale threats, regional socio-economic challenges remain critical to the reserve's long-term protection, essential for safeguarding the monarch butterfly's overwintering colonies.
Land‐Use Change and Hillslope Instability in the Monarch Butterfly Biosphere Reserve, Central Mexico
A significant landsliding episode in February 2010 within the Monarch Butterfly Biosphere Reserve (MBBR) in Mexico revealed that deforestation played a critical role in hillslope instability, leading to debris flows that caused 16 deaths and substantial damage. The study analyzed land-use changes over four decades (1971–2010), finding that while deforestation rates remained relatively low compared to other regions of Mexico, the 2010 landslides destroyed or degraded approximately 54.57 hectares of forest. This suggests that payments for environmental services may mitigate human-induced deforestation but highlights the need for disaster risk management in fragile ecosystems. The research combined digital photo interpretation and field observations to assess land-cover changes and their relationship with landsliding.
Deforestation and forest degradation in the Monarch Butterfly Biosphere Reserve, Mexico, 2003–2009
Between 2003 and 2009, the Monarch Butterfly Biosphere Reserve in Mexico experienced significant forest degradation and deforestation, with 2152 hectares affected, primarily due to illegal logging by organized gangs. These changes were concentrated in four specific areas outside the Payment for Environmental Services (PES) program and zones of land conflicts. Notably, degradation decreased where logging declined, particularly on properties included in the PES program or where exploitation permits had expired. The study used digital aerial photographs and satellite images to analyze biennial changes, revealing a trend of decreasing disturbances by 2011, attributed to the PES program, promotion of productive activities, and social work in the area.
Leaf Chlorophyll Content Estimation in the Monarch Butterfly Biosphere Reserve
Research identifies the red edge position index and related vegetation indices as the most effective for estimating chlorophyll content in oyamel (Abies religiosa L.) leaves within the Monarch Butterfly Biosphere Reserve. These indices demonstrated strong correlations (r = 0.531 to r = 0.472) with chlorophyll levels, surpassing other metrics like nitrogen content. The study analyzed hyperspectral reflectance data from 140 trees in Sierra Chincua sanctuary, Mexico, revealing that environmental factors such as altitude and slope significantly influenced leaf composition, while vegetation indices were more affected by site orientation. This finding offers a non-invasive method for monitoring plant health in this critical ecosystem.
Vegetation and land use 2009: Monarch Butterfly Biosphere Reserve, Mexico
A detailed mapping of vegetation and land use in the Monarch Butterfly Biosphere Reserve, Mexico, reveals critical insights into one of the world's most vital protected areas. The study, conducted using high-resolution aerial photographs (40 cm/pixel) from 2009, identified plant communities through photo-interpretation and field surveys, digitized at a scale of 1:5,000. This approach combined traditional photo-interpretation techniques with geographic information systems (GIS), producing an ortho-corrected mosaic that provides precise data on the reserve's ecological structure. The findings are based on Mexico's national forest inventory classification system and offer a comprehensive spatial analysis of this UNESCO site, which hosts millions of migrating Monarch butterflies annually.
You are here:
World Heritage Explorer > World Heritage Research > World Heritage Sites > Monarch Butterfly Biosphere Reserve