VICARIANT SPECIATION OF CURASSOWS (AVES, CRACIDAE): A HYPOTHESIS BASED ON MITOCHONDRIAL DNA PHYLOGENY
- 1 January 2004
- journal article
- Published by Oxford University Press (OUP) in The Auk
Abstract
The curassows comprise 14 species of sedentary Neotropical birds classified in four genera (Crax, Nothocrax, Mitu, and Pauxi) in the family Cracidae. Congeneric species have a striking pattern of allopatric distributions that might be attributable to vicariance, dispersal, or a combination of the two. To test those biogeographic hypotheses, a strongly supported phylogeny was needed, so that existing problems of taxonomic rank could be solved and a better understanding of the group's evolutionary history attained. We therefore estimated the phylogenetic relationships of all 14 species, on the basis of 6,929 sites of six different mitochondrial DNA regions, and reassessed the status of the four genera. Sequences from the ND4 gene favored a tree that was highly incongruent with the tree recovered using the other five gene regions. However, when the ND4 sequences were concatenated with the sequences of the other genes, the optimal phylogeny was unchanged from that derived for the other genes. That co... RESUMEN El grupo de los pavones o paujiles incluye 14 especies de aves neotropicales sedentarias clasificadas en cuatro géneros (Crax, Nothocrax, Mitu y Pauxi) en la familia Cracidae. Las especies cogenéricas presentan un llamativo patrón de distribuciones alopátricas, que podría ser atribuido a vicarianza, dispersión o a una combinación de los dos procesos. Para poner a prueba estas hipótesis biogeográficas, resultaba necesario contar con una filogenia fuertemente respaldada de modo que los problemas de rango taxonómico existentes pudieran resolverse y se alcanzara un mejor entendimiento de la historia evolutiva del grupo. Por lo tanto, estimamos las relaciones filogenéticas entre las 14 especies con base en 6,929 posiciones nucleotídicas de seis regiones mitocondriales diferentes, y revaluamos el estatus de los cuatro géneros. Las secuencias del gen ND4 sugirieron un árbol que fue sustancialmente incongruente con el árbol recobrado usando las otras cinco regiones. Sin embargo, cuando las secuencias de N...Keywords
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