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The state of Colima in western Mexico is part of the transition zone between the two biogeographic regions of America, the Nearctic and the Neotropical. The state has particularly high mammalian diversity (128 species) and is in the area with the greatest concentration of endemic species in Mexico (25%). As a result, there is intrinsic scientific interest in the study of mammals of Colima. However, the mammalian fauna has received only limited attention to date. There is no published comprehensive inventory of mammals of Colima and only a few detailed reports of the species that occur at any given location within the state have been published. As a contribution to the knowledge of mammals present in Colima, data were compiled on the mammals of Ejido Ranchitos, municipality of Minatitlan, and the species were characterized. We recorded 35 species, 9 monotypic and 26 polytypic, gathering information on natural history and reproductive condition for each. These represent 27.3% of species of mammals known from Colima and 7.4% of the total for Mexico. Eleven species were endemic, comprising 31.4% of species captured for Ejido Ranchitos and 6.5% of the endemic species for Mexico. Nonvolant mammals exhibited three reproductive patterns: continual polyestrous (10 species, 28.6%), seasonal polyestrous (4, 11.4%), and seasonal monoestrous (3, 8.6%). Reproductive patterns for bats were seasonal monoestrous (7 species, 20.0%), asynchronic continual polyestrous (7, 20.0%), bimodal polyestrous (2, 5.7%), continual polyestrous (1, 2.9%), and asynchronic monoestrous (1, 2.9%). Three of the species we examined (Heteromys spectabilis, Neotoma mexicana tenuicauda ,a ndPeromyscus hylocetes) have not been reported previously for Colima. Overall, Ejido Ranchitos supports a diverse fauna of small-sized and medium-sized mammals. RESUMEN—El estado de Colima se localiza en el oeste de Mexico y forma parte de la zona de transicion entre las dos grandes regiones biogeograficas del continente americano, la Neartica y la Neotropical. Este estado tiene una alta biodiversidad de mamo ´feros (128 especies) y se encuentra dentro del area con mayor concentracion de especies endemicas (25%) de Mexico. Como resultado, existe un interes ciento ´fico en el estudio de los mamo ´feros de Colima. Sin embargo, esta fauna ha recibido poca atencion a la fecha y no existe un inventario completo. Solo unos pocos reportes detallados de las especies en ciertas localidades en el estado han sido publicados. Por esto, deseamos contribuir al conocimiento de los mamo ´feros del estado de Colima y para tal fin realizamos un inventario del ejido Ranchitos, municipio de Minatitlan. Registramos 35 especies, 9 monoto ´picas y 26 polito ´picas, y reunimos informacion de su historia natural y condicion reproductiva. Estas especies representan 27.3% de las especies conocidas de mamo ´feros para Colima y 7.4% del total para Mexico. Once especies fueron endemicas y representan 31.4% del total capturado y 6.5% de las especies endemicas de Mexico. Los mamo ´feros no voladores exhibieron tres patrones reproductivos: poliestro continuo (10 especies, 28.6%), poliestro estacional (4, 11.4%) y monoestro estacional (3, 8.6%), mientras que los murcielagos presentaron cinco patrones reproductivos: monoestro estacional (7 especies, 20.0%), poliestro continuo asincronico (7, 20.0%), poliestro bimodal (2, 5.7%), poliestro continuo (1, 2.9%) y monoestro asincronico (1, 2.9%). Capturamos tres nuevas especies (Heteromys spectabilis, Neotoma mexicana tenuicauda ,y Peromyscus hylocetes) para el estado de Colima. En conclusion, el ejido Ranchitos alberga una gran diversidad de mamo ´feros de tamano pequeno y |
