Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/97952
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Type: Journal article
Title: Species collapse via Hybridization in Darwin's tree finches
Author: Kleindorfer, S.
O'Connor, J.
Dudaniec, R.
Myers, S.
Robertson, J.
Sulloway, F.
Citation: American Naturalist, 2014; 183(3):325-341
Publisher: University of Chicago Press
Issue Date: 2014
ISSN: 0003-0147
1537-5323
Statement of
Responsibility: 
Sonia Kleindorfer, Jody A. O, Connor, Rachael Y. Dudaniec, Steven A. Myers, Jeremy Robertson, and Frank J. Sulloway
Abstract: Species hybridization can lead to fitness costs, species collapse, and novel evolutionary trajectories in changing environments. Hybridization is predicted to be more common when environmental conditions change rapidly. Here, we test patterns of hybridization in three sympatric tree finch species (small tree finch Camarhynchus parvulus, medium tree finch Camarhynchus pauper, and large tree finch: Camarhynchus psittacula) that are currently recognized on Floreana Island, Galápagos Archipelago. Genetic analysis of microsatellite data from contemporary samples showed two genetic populations and one hybrid cluster in both 2005 and 2010; hybrid individuals were derived from genetic population 1 (small morph) and genetic population 2 (large morph). Females of the large and rare species were more likely to pair with males of the small common species. Finch populations differed in morphology in 1852-1906 compared with 2005/2010. An unsupervised clustering method showed (a) support for three morphological clusters in the historical tree finch sample (1852-1906), which is consistent with current species recognition; (b) support for two or three morphological clusters in 2005 with some (19%) hybridization; and (c) support for just two morphological clusters in 2010 with frequent (41%) hybridization. We discuss these findings in relation to species demarcations of Camarhynchus tree finches on Floreana Island.
Keywords: Camarhynchus; Philornis downsi; parasite; mate choice; disassortative pairing; asymmetric reproductive isolation
Rights: © 2014 by The University of Chicago
RMID: 0030028710
DOI: 10.1086/674899
Appears in Collections:Ecology, Evolution and Landscape Science publications

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