Lack of premating isolation at the base of a phylogenetic tree

The American Naturalist
B R Grant, P R Grant

Abstract

Darwin's finches in the Galápagos archipelago are an unusual example of adaptive radiation in that the basal split separates two lineages of warbler finches (Certhidea olivacea and Certhidea fusca) believed until recently to be only one species. The large genetic difference between them contrasts with their similarity in plumage, size, shape, and courtship behavior. They differ in song, which is a key factor in premating isolation of other sympatric Darwin's finches. We conducted playback experiments to see whether members of the population of C. olivacea on Santa Cruz Island would respond to songs of C. fusca from two islands, Genovesa and Pinta, and songs of C. olivacea from another island (Isabela). Another set of experiments was performed, using the same playback tapes, with C. fusca on Genovesa. Some members of both populations responded to all playbacks; therefore, the hypothesis of complete premating isolation on the basis of song is rejected. Discrimination between songs of the two lineages was inconsistent. We conclude that premating barriers to interbreeding among the tested populations have not arisen in the 1.5-2.0 m.yr. of their geographical isolation on different islands. This contrasts with strong premating barri...Continue Reading

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Citations

May 17, 2006·Trends in Ecology & Evolution·Ole Seehausen
Mar 3, 2010·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jeffrey Podos
Jul 31, 2004·Annual Review of Phytopathology·Andrew G PalmerDavid G Lynn
Oct 24, 2013·Proceedings of the National Academy of Sciences of the United States of America·Kathryn D KavanaghClifford J Tabin
Jun 7, 2005·The American Naturalist·Peter R GrantK Petren
Jan 28, 2014·The American Naturalist·David R WilsonDaniel J Mennill
Nov 21, 2007·Journal of Evolutionary Biology·D J FosterA P Hendry
Feb 20, 2009·Journal of Evolutionary Biology·K A YoungG F Turner
Sep 23, 2008·Evolution; International Journal of Organic Evolution·J Albert C UyChristopher E Filardi
Mar 22, 2008·Journal of Evolutionary Biology·M BrambillaA Sorace
Feb 27, 2008·Evolution; International Journal of Organic Evolution·Eric M JansonPatrick Abbot
Oct 26, 2011·Evolution; International Journal of Organic Evolution·Heather L Farrington, Kenneth Petren
Jan 14, 2004·The Journal of Experimental Biology·Jeffrey PodosMarcos R Rossi-Santos

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