Ecoregions of Mexico

Ecoregions of Mexico
Name	Ecoregions of Mexico
Biome	Multiple
Countries	Mexico

Ecoregions of Mexico are the distinct ecological areas defined by climate, geography, flora, and fauna across the territory of Mexico. The country contains a mosaic of Sierra Madre del Sur, Sierra Madre Occidental, Trans-Mexican Volcanic Belt, Baja California Peninsula and Yucatán Peninsula landscapes, creating high diversity from Sonoran Desert to Petén–Veracruz moist forests and from Gulf of California islands to the Caribbean Sea. This diversity links to larger units such as the Nearctic realm and Neotropical realm, shaping distributions with ties to regions including Arizona, Texas, Belize, Guatemala, and Honduras.

Overview and Classification

Mexico’s ecoregions are classified by frameworks such as the World Wildlife Fund (WWF) ecoregion system and the Freshwater ecoregions of the world map, integrating biomes like tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, temperate coniferous forests, montane grasslands and shrublands, deserts and xeric shrublands, and mangroves. National inventories produced by the Comisión Nacional para el Conocimiento y Uso de la Biodiversidad and mapping by the Instituto Nacional de Ecología y Cambio Climático align with international categorizations used by Convention on Biological Diversity reports and assessments by the Intergovernmental Panel on Climate Change. Cross-border ecoregions show continuity with the Sonoran Desert, Chihuahuan Desert, and Central American corridors described in publications by the Smithsonian Tropical Research Institute and the American Museum of Natural History.

Major Terrestrial Ecoregions

Mexico’s terrestrial ecoregions include the Sierra Madre Occidental pine–oak forests and Sierra Madre Oriental pine–oak forests where genera such as Pinus and Quercus dominate, intergrading with the Trans-Mexican Volcanic Belt pine–oak forests and the high-elevation Mexican montane forests. Lowland areas include Tropical dry forests of the Balsas Basin and Jalapa region linked to the Tehuantepec Isthmus and Chiapas Highlands, and humid regions such as the Veracruz moist forests and Chiapas montane forests that harbor species shared with Central American Atlantic moist forests and Petén. Arid ecoregions include the Chihuahuan Desert, Sonoran Desert, and islands of the Gulf of California xeric scrub with endemics seen on Isla Espíritu Santo and in the Cape Region of Baja California Sur. Coastal and lowland mosaics include Tamaulipan mezquital and Mexican Gulf coastal mangroves adjacent to the Lacandon Jungle and river systems like the Grijalva River and Usumacinta River basins.

Marine and Freshwater Ecoregions

Marine ecoregions span the Gulf of Mexico, Caribbean Sea, and the Eastern Pacific including the Gulf of California—areas studied by institutions like the Scripps Institution of Oceanography and the Monterey Bay Aquarium Research Institute. Key marine habitats include coral reefs on the Mesoamerican Barrier Reef System near Cozumel, upwelling zones off the Baja California coast that support anchoveta and tuna fisheries, and estuarine mangrove systems along the Pánuco River and Río Bravo del Norte delta. Freshwater ecoregions comprise endorheic basins of the Mexicali Valley, the Rio Grande/Río Bravo watershed shared with United States states, the lacustrine systems of Lago de Chapala and Lagos de Montebello, and the headwaters of the Usumacinta and Grijalva systems that sustain migratory fishes and endemic freshwater turtles described by researchers at Instituto de Biología UNAM.

Biogeographic Provinces and Endemism

Mexico contains biogeographic provinces such as the Mexican Plateau, the Sierra Madre del Sur, the Oaxacan Highlands, and the Yucatán Peninsula, reflecting admixtures of Nearctic and Neotropical lineages. Endemism hotspots include cloud forests on the Sierra Madre de Chiapas with endemic frogs and orchids cataloged by the Royal Botanic Gardens, Kew and the Institute of Biology, UNAM, xeric island faunas in the Gulf of California as described by Edward O. Wilson-era biogeographic syntheses, and endemic cacti and agaves in the Tehuacán-Cuicatlán Valley. Iconic endemic taxa include the Axolotl (Ambystoma mexicanum) of Xochimilco, the Vaquita of the Gulf of California, and diverse endemics in genera such as Salvia, Agave, Heliconia, and Euphorbia recorded in regional floras and monographs.

Conservation Status and Threats

Major threats to Mexican ecoregions include deforestation for agriculture and cattle ranching in regions like Veracruz and Chiapas, fragmentation from infrastructure projects such as the Maya Train corridor debates, overfishing in the Gulf of California and Pacific fisheries, invasive species like Prosopis juliflora and African tilapia, and climate change impacts projected by the Intergovernmental Panel on Climate Change including altered precipitation in the Balsas Basin and shifts in cloud forest elevational ranges. Conservation assessments by the IUCN and national evaluations indicate many ecoregions are threatened, with pressures from mining concessions in areas like Sonora and urban expansion around Mexico City and Guadalajara stressing water resources and biotic integrity.

Protected Areas and Management Strategies

Mexico’s protected area network includes Biosphere Reserves like Sian Ka'an, national parks such as Laguna de los Petenes and Cumbres de Monterrey, and community-managed areas recognized under programs by the Comisión Nacional de Áreas Naturales Protegidas (CONANP). Management strategies blend government designation, indigenous communal stewardship by groups such as the Zapotec and Maya, payment for ecosystem services schemes modeled on initiatives by the World Bank and CONABIO, and conservation partnerships with NGOs including Conservation International, World Wildlife Fund, and the Natural Conservancy. Restoration projects target mangrove reforestation in Campeche, rewilding corridors across the Sierra Madre for jaguar connectivity with initiatives supported by the Wildlife Conservation Society and transboundary efforts with the United States and Belize to secure migratory routes.

Category:Ecoregions