Gerardo Ceballos, Ph.D.1, Andrés García, Ph.D.2, and Paul R. Ehrlich, Ph.D.3, 1Instituto de Ecología, Tercer Circuito Exterior S/N, Ciudad Universitaria, Universidad Nacional Autónoma de México, México D. F. 04510, MEXICO. 2Estación de Biología Chamela, Instituto de Biología, Universidad Nacional Autónoma de México. Apartado Postal 21, San Patricio, La Huerta, Jalisco, 48980, MEXICO. 3 Center for Conservation Biology, Department of Biological Sciences, Stanford University, Stanford CA. 94301, USA. Abstract Today the number of species is...
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