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Divergence with gene flow as facilitated by ecological differences : within-island variation in Darwin's finches

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de León, Luis Fernando

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Divergencia con flujo genético como facilitado por diferencias ecologías : variación intra-isla en los pinzones de Darwin

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598.883 23

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En: Philosophical Transactions of the Royal Society B 2010 vol. 365, no. 1543, p. 1041-1052Resumen: Divergence and speciation can sometimes proceed in the face of, and even be enhanced by, ongoing gene flow. We here study divergence with gene flow in Darwin's finches, focusing on the role of ecological/adaptive differences in maintaining/promoting divergence and reproductive isolation. To this end, we survey allelic variation at 10 microsatellite loci for 989 medium ground finches (Geospiza fortis) on Santa Cruz Island, Galápagos. We find only small genetic differences among G. fortis from different sites. We instead find noteworthy genetic differences associated with beak. Moreover, G. fortis at the site with the greatest divergence in beak size also showed the greatest divergence at neutral markers; i.e. the lowest gene flow. Finally, morphological and genetic differentiation between the G. fortis beak-size morphs was intermediate to that between G. fortis and its smaller (Geospiza fuliginosa) and larger (Geospiza magnirostris) congeners. We conclude that ecological differences associated with beak size (i.e. foraging) influence patterns of gene flow within G. fortis on a single island, providing additional support for ecological speciation in the face of gene flow. Patterns of genetic similarity within and between species also suggest that interspecific hybridization might contribute to the formation of beak-size morphs within G. fortis.

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	Artículo	Corley Smith Library Artículos		Galápagos		589.883 DEL 2010 (Navegar estantería(Abre debajo))					Disponible			2010-047
	Documento electrónico	Corley Smith Library Colección PDF		Galápagos		598.883 DEL 2010 (Navegar estantería(Abre debajo))					Disponible			2021-1987

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Previo	598.883 CIM 2016 Darwin’s finches treat their feathers with a natural repellent.	598.883 CUN 2013 A trial translocation of the critically endangered mangrove finch.	598.883 CUN 2015 Conserving the critically endangered mangrove finch :	598.883 DEL 2010 Divergence with gene flow as facilitated by ecological differences :	598.883 DEL 2011 Exploring possible human influences on the evolution of Darwin's finches /	598.883 DUD 2005 Blood and intestinal parasitism in Darwin´s finches :	598.883 DUD 2008 Genetic variation in the invasive avian parasite,philornis downsi (diptera,MUSCIDAE) ONTHE GALAPAGOS ARCHIPIELAGO	Siguiente

Divergence and speciation can sometimes proceed in the face of, and even be enhanced by, ongoing gene flow. We here study divergence with gene flow in Darwin's finches, focusing on the role of ecological/adaptive differences in maintaining/promoting divergence and reproductive isolation. To this end, we survey allelic variation at 10 microsatellite loci for 989 medium ground finches (Geospiza fortis) on Santa Cruz Island, Galápagos. We find only small genetic differences among G. fortis from different sites. We instead find noteworthy genetic differences associated with beak. Moreover, G. fortis at the site with the greatest divergence in beak size also showed the greatest divergence at neutral markers; i.e. the lowest gene flow. Finally, morphological and genetic differentiation between the G. fortis beak-size morphs was intermediate to that between G. fortis and its smaller (Geospiza fuliginosa) and larger (Geospiza magnirostris) congeners. We conclude that ecological differences associated with beak size (i.e. foraging) influence patterns of gene flow within G. fortis on a single island, providing additional support for ecological speciation in the face of gene flow. Patterns of genetic similarity within and between species also suggest that interspecific hybridization might contribute to the formation of beak-size morphs within G. fortis.

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