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Geographic Variation in the Yellow-Billed Cacique, Amblycercus holosericeus, a Partial Bamboo Specialist

Andrew W. Kratter
The Condor
Vol. 95, No. 3 (Aug., 1993), pp. 641-651
DOI: 10.2307/1369607
Stable URL: http://www.jstor.org/stable/1369607
Page Count: 11
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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.
Geographic Variation in the Yellow-Billed Cacique, Amblycercus holosericeus, a Partial Bamboo Specialist
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Abstract

Geographic variation in the Yellow-billed Cacique (Amblycercus holosericeus) was examined to determine whether bamboo-specialized populations in highland Costa Rica and the Andes are more phenetically similar to one another than to lowland populations not specialized on bamboo. Significant geographic variation was found for all mensural characters; in general, characters varied in accordance with Bergmann's rule. Specimens largely separated into two groups: (1) the Andes and (2) Middle America and the Chocó forests of northwestern South America. The bamboo-specialized population of highland Costa Rica grouped with the non-specialized lowland samples of group 2, not with specialists in the Andes. This suggests that bamboo specialization arose independently in these two populations. There is no convergence in morphology evident between the two populations specialized on bamboo; thus specialization on bamboo as a foraging site or habitat may not be associated with morphological specialization in this species.

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