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Genetic Variation and Differentiation in Mexican Populations of Common Bush-Tanagers and Chestnut-Capped Brush-Finches

A. Townsend Peterson, Patricia Escalante P. and Adolfo Navarro S.
The Condor
Vol. 94, No. 1 (Feb., 1992), pp. 244-253
DOI: 10.2307/1368813
Stable URL: http://www.jstor.org/stable/1368813
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Genetic Variation and Differentiation in Mexican Populations of Common Bush-Tanagers and Chestnut-Capped Brush-Finches
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Abstract

Genetic differentiation among four Mexican populations each of Common Bush-tanagers (Chlorospingus ophthalmicus) and Chestnut-capped Brush-finches (Atlapetes brunneinucha) was evaluated using allozyme electrophoresis. In both species, although levels of within-population variation are moderate, among-population variation is extreme, including fixed differences among populations. Genetic variation is significantly reduced in some populations on the smallest habitat islands. Differentiation is apparently unrelated to geographic distance among populations, and effects of habitat island size and isolation on genetic differentiation are not clear. Populations of the Sierra de los Tuxtlas in Veracruz, however, are strongly differentiated in both species./// La diferenciación genética entre cuatro poblaciones mexicanas del Saltón Chayotero (Atlapetes brunneinucha) y del Cerquero Verde (Chlorospingus ophthalmicus) fue estudiada usando electroforésis de alozimas. Los niveles de variabilidad intrapoblacional fueron moderados, pero la variabilidad entre poblaciones fue extrema, incluyendo diferencias fijas entre poblaciones, en ambas especies. La variación genética fue reducida significativamente en algunas poblaciones de las islas-habitat más pequeñas. Aparentemente, la diferenciación no está relacionada a la distancia geográfica entre poblaciones, y los efectos de tamaño de la isla-habitat y de aislamiento sobre la diferenciación genética son inciertos. Las poblaciones de la Sierra de Los Tuxtlas, Veracruz, sin embargo, están diferenciadas marcadamente en ambas especies.

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