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A test of the mechanistic process behind the convergent agonistic character displacement hypothesis

Author

Listed:
  • Shannon Buckley Luepold
  • Sandro Carlotti
  • Gilberto Pasinelli

Abstract

In this era of rapid global change, understanding the mechanisms that enable or prevent species from co-occurring has assumed new urgency. The convergent agonistic character displacement (CACD) hypothesis posits that signal similarity enables the co-occurrence of ecological competitors by promoting aggressive interactions that reduce interspecific territory overlap and hence, exploitative competition. In northwestern Switzerland, ca. 10% of Phylloscopus sibilatrix produce songs containing syllables that are typical of their co-occurring sister species, Phylloscopus bonelli (“mixed singers”). To examine whether the consequences of P. sibilatrix mixed singing are consistent with CACD, we combined a playback experiment and an analysis of interspecific territory overlap. Although P. bonelli reacted more aggressively to playback of mixed P. sibilatrix song than to playback of typical P. sibilatrix song, interspecific territory overlap was not reduced for mixed singers. Thus, the CACD hypothesis was not supported, which stresses the importance of distinguishing between interspecific aggressive interactions and their presumed spatial consequences.

Suggested Citation

  • Shannon Buckley Luepold & Sandro Carlotti & Gilberto Pasinelli, 2024. "A test of the mechanistic process behind the convergent agonistic character displacement hypothesis," Behavioral Ecology, International Society for Behavioral Ecology, vol. 35(6), pages 141-152.
    • Handle: RePEc:oup:beheco:v:35:y:2024:i:6:p:141-152.
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    File URL: http://hdl.handle.net/10.1093/beheco/arae072
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    References listed on IDEAS

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    1. Jason T Weir & Trevor D Price, 2019. "Song playbacks demonstrate slower evolution of song discrimination in birds from Amazonia than from temperate North America," PLOS Biology, Public Library of Science, vol. 17(10), pages 1-19, October.
    2. Andy J Boyce & Thomas E Martin, 2019. "Interspecific aggression among parapatric and sympatric songbirds on a tropical elevational gradient," Behavioral Ecology, International Society for Behavioral Ecology, vol. 30(2), pages 541-547.
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