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How much variation in the molt duration of passerines can be explained by the growth rate of tail feathers?

Author:
  • Ivan de la Hera
  • Sonja V. Schaper
  • Jose A. Diaz
  • Javier Perez-Tris
  • Staffan Bensch
  • Jose Luis Telleria
Publishing year: 2011
Language: English
Pages: 321-329
Publication/Series: The Auk
Volume: 128
Issue: 2
Document type: Journal article
Publisher: BioOne

Abstract english

In birds, molt duration is an important trait that can affect plumage functionality and, consequently, the fitness of individuals. However, knowledge about the factors that affect variation in molt speed is sparse, mostly because of the methodological difficulties of studying avian molt. We used a ptilochronology-based approach to estimate the rate at which tail feathers were produced during molt to shed light on the relationship between molt duration and feather growth rate. For that purpose, we used three data sets. First, we tested whether the average molt durations of 22 passerine species were correlated with the mean growth rates of their feathers, using both conventional and phylogenetically corrected statistical procedures. Second, we explored this same association among captive Great Tits (Pants major). And third, we took advantage of the biannual complete molt of Willow Warblers (Phylloscopus trochilus) to examine whether the feathers synthesized during their short summer molt grew faster than those produced during their long winter molt. Feather growth rates were negatively correlated with molt duration in all analyses, revealing that molt duration can be estimated from the growth rate of a single feather. However, predictive power was limited by the fact that molt duration is modulated mainly by molt intensity, which seems to be correlated with ecological constraints in our interspecific approach. We also discuss the implications of our results for the evolution of molt duration, and the potential application of ptilochronology in its study. Received 2 August 2010, accepted 21 December 2010.

Keywords

  • Biological Sciences
  • comparative method
  • migration constraints
  • molt evolution
  • phenotypic
  • diversity analysis programs (PDAP)
  • phylogenetically independent
  • contrasts

Other

Published
  • Molecular Ecology and Evolution Lab
  • ISSN: 0004-8038
Staffan Bensch
E-mail: staffan [dot] bensch [at] biol [dot] lu [dot] se

Professor

MEMEG

+46 46 222 42 92

E-C213

Sölvegatan 37, Lund

50

Head of unit

MEMEG

+46 46 222 42 92

E-C213

Sölvegatan 37, Lund

50

Research group

Molecular Ecology and Evolution Lab

Projects

Doctoral students and postdocs

PhD students, main supervisor

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