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Science 20 October 2000:
Vol. 290. no. 5491, pp. 516 - 518
DOI: 10.1126/science.290.5491.516
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Reports

Rapid Evolution of Reproductive Isolation in the Wild: Evidence from Introduced Salmon

Andrew P. Hendry,1* John K. Wenburg,2 Paul Bentzen,23 Eric C. Volk,4 Thomas P. Quinn3

Colonization of new environments should promote rapid speciation as a by-product of adaptation to divergent selective regimes. Although this process of ecological speciation is known to have occurred over millennia or centuries, nothing is known about how quickly reproductive isolation actually evolves when new environments are first colonized. Using DNA microsatellites, population-specific natural tags, and phenotypic variation, we tested for reproductive isolation between two adjacent salmon populations of a common ancestry that colonized divergent reproductive environments (a river and a lake beach). We found evidence for the evolution of reproductive isolation after fewer than 13 generations.

1 Organismic and Evolutionary Biology Program, University of Massachusetts, Amherst, MA 01003-5810, USA.
2 Marine Molecular Biotechnology Laboratory, University of Washington, 3707 Brooklyn Avenue Northeast, Seattle, WA 98105-6715, USA.
3 School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, WA 98195, USA.
4 Washington Department of Fish and Wildlife, 600 Capitol Way North, Olympia, WA 98501, USA.
*   To whom correspondence should be addressed. E-mail: ahendry{at}bio.umass.edu

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