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Altitudinal Distribution of Birds in the Sierra Madre Del Sur, Guerrero, Mexico

Adolfo G. Navarro S.
The Condor
Vol. 94, No. 1 (Feb., 1992), pp. 29-39
DOI: 10.2307/1368793
Stable URL: http://www.jstor.org/stable/1368793
Page Count: 11
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Altitudinal Distribution of Birds in the Sierra Madre Del Sur, Guerrero, Mexico
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Abstract

Altitudinal patterns of distribution, diversity, and species turnover in the avifauna of the Sierra de Atoyac, Sierra Madre del Sur, Guerrero, México, were studied along a transect from the tropical coastal plain to high-altitude coniferous forests. Species richness is highest at low elevations and declines with increasing altitude. Richness is relatively uniform within habitat types, but high levels of species turnover are found at habitat ecotones. Altitudinal ranges of congener species pairs overlap more frequently than predicted by null models, suggesting that competition may not have played a dominant role in structuring the community. Patterns of diversity, endemism, and habitat destruction are discussed in terms of conservation priorities. /// Se estudiaron los patrones de distribución altitudinal, diversidad y recambio de especies de la avifauna residente en la Sierra de Atoyac, Guerrero, México, a lo largo de un transecto altitudinal que abarca todos los tipos de vegetación presentes, desde la vegetación costera hasta los bosques altos de coníferas. La riqueza de especies es mayor en las partes bajas, decreciendo conforme aumenta la altitud. La riqueza es notablemente constante dentro de los hábitats, pero altos niveles de recambio de especies se encuentran en los ecotonos. Los intervalos altitudinales que ocupan pares y tríos de especies congenéricas muestran un mayor solapamiento que el predicho por modelos estadísticos nulos, sugiriendo que la competencia no ha jugado un papel dominante en la estructuración de las comunidades. Los patrones de diversidad, endemismo y los efectos de la destrucción de los hábitats son discutidos en términos de prioridades de conservación.

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