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Evolution of vocal performance and song complexity in island birds

Authors :
Aloïs Robert
Thierry Lengagne
Martim Melo
Doris Gomez
Claire Doutrelant
Source :
Journal of Avian Biology, Vol 2022, Iss 1, Pp n/a-n/a (2022)
Publication Year :
2022
Publisher :
Wiley, 2022.

Abstract

Oceanic islands share distinctive characteristics thought to underlie a set of parallel evolutionary trends across islands and taxonomic groups – including life‐history traits, morphology and visual signals. To which extent acoustic signals also change in parallel on islands is less clear. Some important processes associated with insularity, such as founder effects and reduced sexual selection, could lead to a decrease in vocal performance and song complexity on islands. In a field‐based study, we recorded 11 insular species and their closest mainland relatives. Out of the 11 species pairs, 6 live in the tropics (São Tomé/Mount Cameroon) and 5 in the temperate region (Madeira/southern France). For each species, we measured two proxies of vocal performance (song duration and syllable rate) and one proxy of song complexity (syllable diversity). This study did not recover a clear relationship between the island environment and song traits. If as expected, syllable rate was lower in island species than in their mainland counterparts, the two other proxies showed no clear island–mainland pattern of divergence. Several factors may explain the absence of reduction for song duration and syllable diversity. Among those, relaxation of interspecific competition on islands may have led to an increase in syllable diversity, or correlations between song variables may have constrained song evolution. More studies on island species are needed to draw a better picture of divergence patterns and go beyond the confounding ecological factors that could explain peculiar song characteristics in islands.

Details

Language :
English
ISSN :
1600048X and 09088857
Volume :
2022
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Journal of Avian Biology
Publication Type :
Academic Journal
Accession number :
edsdoj.98500ec446ce43f99e006b890c6666cd
Document Type :
article
Full Text :
https://doi.org/10.1111/jav.02726