Sympatric Speciation Based on Allelic Changes at Three Loci: Evidence from Natural Populations in Two Habitats

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Science  23 Sep 1977:
Vol. 197, Issue 4310, pp. 1298-1299
DOI: 10.1126/science.197.4310.1298


Allelic changes at three loci largely explain Chrysopa downesi's sympatric speciation from a Chrysopa carnea-like ancestor. Disruptive selection first produced a stable polymorphism based on a single pair of alleles that adapted individuals to two habitats, and second, it established seasonal asynchrony in reproduction through allelic substitutions at two loci.