Morphological divergence in a continental adaptive radiation: South American ovenbirds of the genus Cinclodes

The Auk
By: , and 

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Abstract

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 ofCinclodes 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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Morphological divergence in a continental adaptive radiation: South American ovenbirds of the genus Cinclodes
Series title The Auk
DOI 10.1642/AUK-14-49.1
Volume 132
Issue 1
Year Published 2015
Language English
Publisher American Ornithological Society
Contributing office(s) Patuxent Wildlife Research Center
Description 11 p.
First page 180
Last page 190
Online Only (Y/N) N
Additional Online Files (Y/N) N