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Bird song, ecology and speciation.

Hans Slabbekoorn1, Thomas B Smith

  • 1Center for Tropical Research and Department of Biology, San Francisco State University, San Francisco, CA 94132, USA. slabbekoorn@rulsfb.leidenuniv.nl

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 25, 2002
PubMed
Summary

Bird song dialects are key to understanding reproductive divergence. New research suggests ecology influences song and morphology, potentially driving speciation through habitat-dependent selection.

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Area of Science:

  • Avian biology
  • Evolutionary biology
  • Behavioral ecology

Background:

  • Bird song dialects were historically crucial for studying reproductive divergence and speciation.
  • Research slowed due to conflicting results, but recent findings highlight ecological influences on song and morphology.
  • A re-examination is needed to understand the interplay between ecology, song, and speciation.

Purpose of the Study:

  • To re-evaluate the role of bird song in reproductive divergence and speciation.
  • To explore how ecological factors drive divergence in song and morphology.
  • To propose new research directions for an integrative approach to speciation.

Main Methods:

  • Focus on species with learned song.
  • Review and analyze conflicting results in existing literature.

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  • Develop a conceptual framework examining post-dispersal plasticity in song learning.

    • Main Results:

    • Habitat-dependent selection can cause parallel divergence in song and morphology.
    • Song may serve as an acoustic cue for females to assess male fitness in specific habitats.
    • Song learning's role in speciation is context-dependent, potentially constraining or promoting divergence.

    Conclusions:

    • An integrative approach, considering ecological selection, is essential for understanding song's role in assortative mating and speciation.
    • Habitat-specific selection on song and fitness traits can lead to parallel evolutionary trajectories.
    • Song learning's influence on speciation evolves over time, initially constraining and later promoting divergence.