Freshwater fishes and water status in Mexico: A country-wide appraisal.

Contreras Balderas, Salvador y Ruiz Campos, Gorgonio y Schmitter Soto, J.J. y Zambrano González, L. y Varela Romero, A. y Mendoza Alfaro, Roberto Eduardo y Ramírez Martínez, C. y Leija Tristán, M. A. y Almada Villela, P. y Hendrickson, D.A. y Lyons, J. (2008) Freshwater fishes and water status in Mexico: A country-wide appraisal. Aquatic ecosystem health & management, 11 (3). pp. 246-256. ISSN 1539-4077

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Resumen

Mexico is the southernmost country in North America, and extends into Central America, south of the Isthmus of Tehuantepec. The northern half of M´exico is located on the Temperate belt and is arid in character (Nearctic), while the rest is within the Tropical belt (Neotropical). Climate varies from extremely temperate desert in the north, to tropical humid in the south.M´exico has more than 500 freshwater fish species, about 271 of them country endemics, and approximately 48 endemics from binational basins. There are still some 30–40 fish species not yet described. There are 563 fish species colonizing coastal flood plain species. In addition to the numbers of colonizing fishes, the burden of introduced exotics has also been growing. In 1904, only 4 species were recognized as exotics; by 1997 the number had increased to 94, and by 2008 to 115

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