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The secondary contact phase of allopatric speciation in Darwin's finches

Author(s): Grant, Peter. R.; Grant, B. Rosemary

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dc.contributor.authorGrant, Peter. R.-
dc.contributor.authorGrant, B. Rosemary-
dc.date.accessioned2019-04-19T18:35:07Z-
dc.date.available2019-04-19T18:35:07Z-
dc.date.issued2009-12-01en_US
dc.identifier.citationGrant, P.R., Grant, B.R. (2009). The secondary contact phase of allopatric speciation in Darwin's finches. Proceedings of the National Academy of Sciences, 106 (48), 20141 - 20148. doi:10.1073/pnas.0911761106en_US
dc.identifier.issn0027-8424-
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1n99d-
dc.description.abstractSpeciation, the process by which two species form from one, involves the development of reproductive isolation of two divergent lineages. Here, we report the establishment and persistence of a reproductively isolated population of Darwin’s finches on the small Galapagos Island of Daphne Major in the secondary contact phase of speciation. In 1981, an immigrant medium ground finch (Geospiza fortis) arrived on the island. It was unusually large, especially in beak width, sang an unusual song, and carried some Geospiza scandens alleles. We followed the fate of this individual and its descendants for seven generations over a period of 28 years. In the fourth generation, after a severe drought, the lineage was reduced to a single brother and sister, who bred with each other. From then on this lineage, inheriting unusual song, morphology, and a uniquely homozygous marker allele, was reproductively isolated, because their own descendants bred with each other and with no other member of the resident G. fortis population. These observations agree with some expectations of an ecological theory of speciation in that a barrier to interbreeding arises as a correlated effect of adaptive divergence in morphology. However, the important, culturally transmitted, song component of the barrier appears to have arisen by chance through an initial imperfect copying of local song by the immigrant. The study reveals additional stochastic elements of speciation, in which divergence is initiated in allopatry; immigration to a new area of a single male hybrid and initial breeding with a rare hybrid female.en_US
dc.format.extent20141 - 20148en_US
dc.language.isoen_USen_US
dc.relation.ispartofProceedings of the National Academy of Sciencesen_US
dc.rightsFinal published version. Article is made available in OAR by the publisher's permission or policy.en_US
dc.titleThe secondary contact phase of allopatric speciation in Darwin's finchesen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1073/pnas.0911761106-
dc.date.eissued2009-11-16en_US
dc.identifier.eissn1091-6490-
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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