Small Clades at the Periphery of Passerine Morphological Space

@article{Ricklefs2005SmallCA,
  title={Small Clades at the Periphery of Passerine Morphological Space},
  author={Robert E. Ricklefs},
  journal={The American Naturalist},
  year={2005},
  volume={165},
  pages={651 - 659}
}
  • R. Ricklefs
  • Published 7 April 2005
  • Biology
  • The American Naturalist
Among passerine birds (order Passeriformes), tribe‐ to family‐level clades with five or fewer species are more frequent than one would expect from a homogeneous speciation and extinction process. Previous analyses also suggested that small clades tend to be marginal geographically and/or ecologically. In this study, I use principal component (PC) scores based on eight log‐transformed measurements of the wing, tail, leg, and beak to test the hypothesis that small clades (≤5 species) occupy… 
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