Document Detail

Evolutionary dead end in the Galápagos: divergence of sexual signals in the rarest of Darwin's finches.
MedLine Citation:
PMID:  20585648     Owner:  NLM     Status:  MEDLINE    
Understanding the mechanisms underlying speciation remains a challenge in evolutionary biology. The adaptive radiation of Darwin's finches is a prime example of species formation, and their study has revealed many important insights into evolutionary processes. Here, we report striking differences in mating signals (songs), morphology and genetics between the two remnant populations of Darwin's mangrove finch Camarhynchus heliobates, one of the rarest species in the world. We also show that territorial males exhibited strong discrimination of sexual signals by locality: in response to foreign songs, males responded weaker than to songs from their own population. Female responses were infrequent and weak but gave approximately similar results. Our findings not only suggest speciation in the mangrove finch, thereby providing strong support for the central role of sexual signals during speciation, but they have also implications for the conservation of this iconic bird. If speciation is complete, the eastern species will face imminent extinction, because it has a population size of only 5-10 individuals.
Henrik Brumm; Heather Farrington; Kenneth Petren; Birgit Fessl
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-06-23
Journal Detail:
Title:  PloS one     Volume:  5     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2010  
Date Detail:
Created Date:  2010-06-29     Completed Date:  2011-01-13     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e11191     Citation Subset:  IM    
Communication and Social Behaviour Group, Max Planck Institute for Ornithology, Seewiesen, Germany.
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MeSH Terms
Biological Evolution*
Sex Factors*
Sexual Behavior, Animal
Songbirds / genetics*,  physiology

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