Artículo de revista
Morphological divergence in a continental adaptive radiation: South American ovenbirds of the genus Cinclodes
Fecha
2015Registro en:
Auk Volume 132, 2015, pp. 180–190
0004-8038
DOI: 10.1642/AUK-14-49.1
Autor
Rader, Jonathan
Dillon, Michael
Terry Chesser, R.
Sabat Kirkwood, Alejandro Pablo
Martínez del Río, Carlos
Institución
Resumen
Cinclodes is an ecologically diverse genus of South American passerine birds and represents a case of continental
adaptive radiation along multiple axes. We investigated morphological diversification in Cinclodes using a
comprehensive set of morphometric measurements of study skins. Principal component analysis identified 2 primary
axes of morphological variation: one describing body size and a second capturing differences in wing-tip shape and
toe length. Phylogenetic analyses of the first principal component suggest an early divergence of Cinclodes into 2 main
clades characterized by large and small body sizes. We suggest that 2 morphological outliers within these main clades
(C. antarcticus and C. palliatus) may be cases of island gigantism and that a third (C. patagonicus) may reflect ecological
character displacement. Despite its ecological and physiological diversity, the genus Cinclodes does not appear to
show morphological diversity beyond what is typical of other avian genera