Species collapse via hybridization in Darwin's tree finches

Sonia Kleindorfer*, Jody A. O'Connor, Rachael Y. Dudaniec, Steven A. Myers, Jeremy Robertson, Frank J. Sulloway

*Corresponding author for this work

Research output: Contribution to journalArticle

72 Citations (Scopus)
21 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)325-341
Number of pages17
JournalAmerican Naturalist
Volume183
Issue number3
DOIs
Publication statusPublished - Mar 2014
Externally publishedYes

Bibliographical note

Copyright 2014 by University of Chicago Press. Originally published in The American naturalist, 183(3), pp. 325 - 341, http://dx.doi.org/10.1086/674899. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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    Kleindorfer, S., O'Connor, J. A., Dudaniec, R. Y., Myers, S. A., Robertson, J., & Sulloway, F. J. (2014). Species collapse via hybridization in Darwin's tree finches. American Naturalist, 183(3), 325-341. https://doi.org/10.1086/674899