MBE Advance Access published online on March 10, 2004
Molecular Biology and Evolution, doi:10.1093/molbev/msh101
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved
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1 Département de Biologie, Université Laval, Ste-Foy, Québec, Canada, G1K 7P4
* To whom correspondence should be addressed. E-mail: louis.bernatchez{at}bio.ulaval.ca.
Under the ecological theory of adaptive radiation, adaptation and reproductive isolation are thought to evolve as a result of divergent natural selection. Accordingly, elucidating the genetic basis of these processes is essential towards understanding the role of selection in shaping biological diversity. In this respect, the number of genes that evolved by selection remains contentious. To address this issue, the pattern of genetic differentiation obtained using 440 AFLP loci was compared with that expected under neutrality in four sympatric pairs of lake whitefish ecotypes that evolved adaptive phenotypic differences associated with the exploitation of distinct ecological niches. On average, 14 loci showed restricted gene flow relative to neutral expectation, suggesting a potential role of directional selection on their divergence. Among all loci that are most likely under directional selection, six exhibited parallel patterns of divergence, which provided further support for the role of selection in driving their divergence. Overall, these results suggests that only a small proportion of scored AFLP loci (between 1.4% and 3.2%) might be linked to genes implicated in the adaptive radiation of lake whitefish. Key Words:
Coregonus clupeaformis, directional selection, speciation, hybridization, reproductive isolation, adaptation
© 2004 Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved.
Original Articles
Multilocus Scan Using AFLP Markers as a Mean to Assess the Role of Directional Selection in the Divergence of Sympatric Whitefish Ecotypes
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