Publications
Geological heritage assessment in the central coast of Sonora and Midriff Islands region of the Gulf of California (Mexico): inventory and implications for management
A comprehensive geoheritage assessment of the central coast of Sonora and Midriff Islands in Mexico's Gulf of California identifies 24 geologically significant sites, revealing their potential for conservation, education, and geotourism. Eight sites exhibit high scientific value, while twelve hold strong educational potential and six offer geotourism opportunities. However, twelve sites face medium-to-high threats from unregulated tourism and land-use changes. The study highlights the need for tailored management strategies, integrating geoheritage into existing conservation frameworks, particularly in Indigenous territories. It suggests that while the region could aspire to international designations like a UNESCO Global Geopark, immediate priorities include raising awareness and fostering community participation. This work underscores the importance of geological knowledge in designing locally grounded, socially inclusive management strategies for sustainable development.
Zooplankton of Bahía de Los Ángeles (Gulf of California) in the Context of Other Coastal Regions of the Northeast Pacific
Zooplankton communities in Bahía de Los Ángeles (BLA), a biodiversity-rich marine protected area within the UNESCO-listed Islands and Protected Areas of the Gulf of California, exhibit strong seasonal variability. Copepods and cladocerans dominate year-round, accounting for 93% of zooplankton abundance, while meroplankton taxa—including bivalve, gastropod, and barnacle larvae—peak during warmer months (summer–autumn). Notably, copepod nauplii surged in January, coinciding with colder temperatures. Among cladocerans, Penilia avirostris emerged as the most abundant species, contributing significantly to zooplankton composition from spring to autumn. This study, based on 81 monthly samples collected between 2017 and 2019, provides critical baseline data for ecological management and contextualizes BLA’s zooplankton dynamics within broader temperate and tropical coastal regions of the northeast Pacific.
Saint Patrick's Bane
Island snakes, despite common perceptions, often exhibit high abundance and diversity, serving as powerful models for studying ecology and evolution. This volume explores how isolation and unique insular environments drive rapid adaptive changes in snake populations, including shifts in body size, reproductive biology, and trophic behavior. Key findings highlight the fragility of island ecosystems, with some species evolving to exploit marine-based food subsidies or adapt to extreme conditions, such as female snakes developing male sex organs due to inbreeding. The research synthesis combines biogeographic overviews and detailed population studies across regions like Borneo, New Guinea, the Gulf of California, and the Galapagos, leveraging genetic data to redefine snake phylogeny. Conservation challenges, including habitat destruction, climate change, and invasive species, are also addressed, emphasizing the need for citizen science and public engagement to protect these evolutionarily unique populations.
Biogeographical affinities of the biota of the Tres Marías Islands, Mexico
The Tres Marías Islands, a UNESCO-listed protected area in Mexico's Gulf of California, exhibit complex biogeographical affinities shaped by tectonic history and dispersal events. Research reveals that the islands' biota primarily aligns with Neotropical regions, particularly the Pacific Lowlands and Veracruzan provinces, while also showing significant Nearctic connections to the Sonoran province. This dual affinity suggests a dynamic assembly process influenced by both vicariance (geological fragmentation) and dispersal during the Miocene–Pleistocene epochs, including periods of glaciation. The study integrates phylogenetic and cladistic analyses to uncover three distinct biogeographical patterns: Neotropical, Sonoran-Neotropical, and Nearctic-Neotropical, highlighting the islands as a critical intersection zone for biodiversity.
Distribution and habitat of Ocelot (Leopardus pardalis) in Sonora, México
Ocelots (Leopardus pardalis) in Sonora, Mexico, are confined to eastern regions with annual rainfall exceeding 400 mm, avoiding the driest areas of the Sonoran Desert. They inhabit diverse environments, including tropical deciduous forests, thornscrub, desert grasslands, oak woodlands, and pine-oak forests, with elevations ranging from 53 to 2,151 meters. Camera trap data from 2015 to 2021, alongside historical records, revealed 147 recent ocelot sightings, including 21 instances of females with kittens, indicating stable breeding populations. Ocelots utilize riparian habitats along major rivers like the Bavispe-Yaqui, Mayo, and Sonora, which serve as dispersal corridors linking the Sierra Madre Occidental, Sky Island Region, and southeastern Arizona to the Gulf of California. These findings highlight critical conservation areas for ocelots in Sonora, emphasizing the importance of protecting these habitats and corridors.
Diversity, Endemism, and Biogeography of Island Snakes of the Gulf of California, Mexico
Island area is the primary driver of snake species richness in the Gulf of California, accounting for 57% of variation, while isolation plays a lesser role. The study found no significant difference in species richness between oceanic and land-bridge islands, though islands with endemic snakes tend to be more isolated but not necessarily smaller. Among the 38 snake species identified across 31 islands, only one is globally threatened (Crotalus catalinensis), while six are listed as 'Amenazada' in Mexico. Threats include invasive species, human disturbances, and illegal collection, with conservation efforts such as protected areas, education, and ex situ populations recommended to mitigate these risks. The research highlights the need for further studies on phylogenetic and functional diversity to enhance biodiversity conservation in this region.
The Herpetofauna of the Insular Systems of Mexico
Mexico's insular systems, covering just 0.26% of its territory, host 226 herpetofaunal species—16.1% of the country's total—with the Gulf of California region exhibiting the highest biodiversity (108 species). A comparative analysis using the Environmental Vulnerability Score (EVS) revealed that 94 species face high vulnerability, while traditional systems like SEMARNAT and IUCN underestimate threats, particularly for insular endemics. The study identifies climate change, urbanization, and wildfires as primary risks, highlighting the Gulf of California and Tropical Pacific islands as conservation priorities. Notably, Mexico is nearing full federal protection of its insular areas, a significant step toward safeguarding this critical biodiversity.
Environmental drivers of sex-biased foraging behavior in Magnificent Frigatebird in Baja California Sur, Mexico
Male Magnificent Frigatebirds (Fregata magnificens) breeding in Baja California Sur, Mexico, exhibit sex-biased foraging behavior by traveling farther and to more distant areas compared to females, despite both sexes targeting equally productive zones. This differential use of foraging grounds may reflect differences in parental investment, intraspecific competition, and sex-specific behavioral traits. Researchers tracked birds using GPS receivers from 2017–2019, identifying core foraging areas near the Espíritu Santo archipelago (Gulf of California) and Santa Margarita Island (Pacific Ocean), while males also foraged extensively south and north of the Baja California peninsula. These findings highlight frigatebirds as indicators of marine productivity, offering insights to expand marine protected areas by delineating critical foraging ranges. The study underscores the importance of sex-based behavioral differences in shaping foraging strategies during breeding seasons.
Interannual Spatial Variability of the Western Hemisphere Warm Pool and the Impacts on Marine Protected Areas in the Mexican Pacific
Research reveals that the Western Hemisphere Warm Pool (WHWP-EP), the second warmest body of water on Earth, significantly impacts marine protected areas (MPAs) in the Mexican Pacific. Using satellite-derived data from the Advanced Very High Resolution Radiometer, scientists analyzed its interannual spatial variability and assessed the response of chlorophyll a (Chla) as a proxy for phytoplankton in MPAs. The study found that most MPAs experienced a negative response to warm events, particularly those in the Deep Mexican Pacific and southern Gulf of California, while the Midriff islands area showed resilience due to its higher tolerance to warm conditions. These findings underscore the need to incorporate phytoplankton dynamics into marine planning and management strategies, especially in areas like the Deep Mexican Pacific where MPAs have shown limited effectiveness.
Why Partner with a Zoo or Garden? Selected Lessons from Seventy Years of Regional Conservation Partnerships at the Arizona-Sonora Desert Museum
Zoos and botanical gardens (ZBGs) are proven versatile partners in regional conservation, as demonstrated by the Arizona-Sonora Desert Museum's 70-year history. These institutions effectively manage ex situ populations of rare species, advocate for protected areas—such as the Gulf of California islands—and convene stakeholders for large-scale initiatives like the Sonoran Desert Conservation Plan. They also contribute long-term field research, including a 40-year phenology database and efforts to designate the Ironwood Forest National Monument. However, sustaining such conservation work poses challenges, highlighting the need for strategic partnerships and resource management.
Historia Ambiental Colectiva y desde Abajo: Aplicaciones para la Resignificación Territorial en el Golfo de California
A novel methodological approach in environmental history, termed 'collective and from below,' offers a pathway for territorial redefinition and community autonomy in the Gulf of California (GoC). This method leverages multiactoral and intercultural collaboration to construct historical knowledge that reflects diverse voices, enriching understanding of biocultural diversity and socio-ecological challenges. The approach also highlights the efforts of communities and organizations in addressing power asymmetries that have historically exploited the region's resources. By contextualizing the GoC's history of exploitation alongside its ecological significance—including its status as a UNESCO World Heritage Site and key contributor to Mexico's fisheries and tourism—the study provides tools for legitimizing struggles in defense of this vital marine ecosystem.
Participación social en la gobernanza del Área de Protección de Flora y Fauna Islas Golfo de California
A study on the Islands and Protected Areas of the Gulf of California reveals that the Comisión Nacional de Áreas Naturales Protegidas (CONANP) lacks credibility among local communities due to its top-down governance approach, which fails to incorporate meaningful participation from affected stakeholders. Researchers analyzed perceptions through 29 semi-structured interviews with public officials, specialists, and users, highlighting a significant barrier: mistrust in public entities prevented many users from participating. The findings underscore the need for more inclusive, community-driven strategies to strengthen environmental governance in this UNESCO World Heritage Site.
Reduced fish diversity despite increased fish biomass in a Gulf of California Marine Protected Area
A study of the Islands and Protected Areas of the Gulf of California reveals that while fish biomass has increased in a Marine Protected Area (MPA), fish diversity has declined. This counterintuitive finding suggests that moderate fishing pressure, despite being less intensive than commercial fishing, still hampers biodiversity conservation. Researchers used traditional and functional metrics to analyze fish assemblages from 2005 to 2017 at Espíritu Santo Island, Mexico, comparing sustainable fishing, traditional fishing, and no-take zones. They found declines in species and functional richness, indicating potential risks of local extinction and loss of ecosystem processes. The increase in biomass was linked to larger average fish sizes rather than commercial species, highlighting the need for stricter enforcement of fishing regulations and expansion of no-take areas to preserve functional diversity.
Dynamic connectivity patterns from an insular marine protected area in the Gulf of California
Dynamic connectivity patterns from San Pedro Mártir Island, a small and isolated marine protected area in the Gulf of California, reveal significant spatial variability over time. Using particle-tracking models based on hydrodynamic data, researchers found that larvae dispersal spans up to 600 km along the coast, with potential ecological and genetic connectivity to distant fishing sites and neighboring Marine Protected Areas (MPAs), though not simultaneously. The study highlights the temporal changes in connectivity, influenced by lunar phases and reproductive cycles of commercial species, suggesting that retention within the island declines from May to June and with longer planktonic durations. These findings underscore the need for adaptive MPA networks that account for dynamic ocean features and match species' reproductive patterns and fisheries behavior.
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