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J. Sobero'n (jsoberon@ku.edu), R. Jimenez and P. Koleff Comisio'n Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO), Insurgentes-Periferico 4903, Tlalpan, Mexico, D.F. 14010 Mexico. (Present address off. S.: Natural History Museum and Biodiversity Research Center, Dyche Hall, Univ. of Kansas, Lawrence, KS, 66047, USA.) J. Golubov, Univ. Autonoma Metropolitana-Xochimilco, Div. de Ciencias Biologicas y de la Salud, Dept El Hombre y Su Ambiente, Lab. Sistemas de Informacio'n Geografica, Calzada del Hueso 1100, Col. Villa Quietud, Mexico.
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Soberón et al. (2007) studied this question.
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