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Molecular Systematics of the Rhinocryptid Genus Pteroptochos

R. Terry Chesser
The Condor
Vol. 101, No. 2 (May, 1999), pp. 439-446
DOI: 10.2307/1370012
Stable URL: http://www.jstor.org/stable/1370012
Page Count: 8
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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.
Molecular Systematics of the Rhinocryptid Genus Pteroptochos
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Abstract

Relationships within the rhinocryptid genus Pteroptochos (huet-huets and turca) were investigated using complete sequences of the mitochondrial genes COII and ND3. Phylogenetic analysis of multiple individuals per taxon revealed that P. castaneus, P. tarnii, and P. megapodius constitute separate lineages, with P. castaneus and P. tarnii as sister taxa, and P. megapodius sister to these. Bootstrap support for these results was strong (79-100%). Sequence divergence between species was high, ranging from 6.1% between P. castaneus and P. tarnii to 7.6% between P. castaneus and P. megapodius. High genetic divergence between P. castaneus and P. tarnii is consistent with plumage and vocal differences between these taxa, and they appear to be separate species under both biological and phylogenetic species concepts. The Bío-Bío River, a proposed dispersal barrier to P. tarnii, may be ineffective in limiting gene flow in this species, east of its confluence with the Laja River. /// Las relaciones filogenéticas dentro del género rhinocrypto Pteroptochos (huet-huets y turca) fueron investigadas usando secuencias completas de los genes mitocondriales COII y ND3. Los análisis filogenéticos que incluyeron múltiples individuos por taxón revelaron que P. castaneus, P. tarnii, y P. megapodius constituyen taxones separados. Pteroptochos castaneus y P. tarnii son taxones hermanos, y P. megapodius es el taxón hermano a estos. El apoyo de "bootstrap" de estos resultados fue fuerte (79-100%). La divergencia entre las secuencias fue alta, de 6.1% entre P. castaneus y P. tarnii y de 7.6% entre P. castaneus y P. megapodius. Esta considerable divergencia genética entre P. castaneus y P. tarnii concuerda con las diferencias que hay entre estas especies en plumaje y vocalizaciones. Por estos resultados se recomienda que estos dos taxa sean considerados especies separadas en términos biologicos y filogenéticos. Es posible que el río Bío-Bío, propuesto como una barrera a la dispersión de P. tarnii, no sea efectivo al este de su confluencia con el río Laja en limitar el flujo genético de estas especies.

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