Evolutionary Dead End in the Galapagos: Divergence of Sexual Signals in the Rarest of Darwin's Finches

被引:8
|
作者
Brumm, Henrik [1 ]
Farrington, Heather [2 ]
Petren, Kenneth [2 ]
Fessl, Birgit [3 ,4 ]
机构
[1] Max Planck Inst Ornithol, Commun & Social Behav Grp, Seewiesen, Germany
[2] Univ Cincinnati, Dept Biol Sci, Cincinnati, OH 45221 USA
[3] Charles Darwin Res Stn, Santa Cruz, Galapagos, Ecuador
[4] Durrell Wildlife Conservat Trust, Jersey, Channel Islands, England
来源
PLOS ONE | 2010年 / 5卷 / 06期
关键词
CHARACTER DISPLACEMENT; ALLOPATRIC SPECIATION; PREMATING ISOLATION; ADAPTIVE RADIATION; SECONDARY CONTACT; SYMPATRIC MORPHS; MANGROVE FINCH; BIRD SONG; SELECTION; DISCRIMINATION;
D O I
10.1371/journal.pone.0011191
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
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页数:7
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