Journal
SCIENCE
Volume 287, Issue 5451, Pages 306-308Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.287.5451.306
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Natural selection plays a fundamental role in most theories of speciation, but empirical evidence from the wild has been lacking. Here the post-Pleistocene radiation of threespine sticklebacks was used to infer natural selection in the origin of species. Populations of sticklebacks that evolved under different ecological conditions show strong reproductive isolation, whereas populations that evolved independently under similar ecological conditions lack isolation. Speciation has proceeded in this adaptive radiation in a repeatable fashion, ultimately as a consequence of adaptation to alternative environments.
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