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Heritable divergence of Rhagoletis pomonella host races by seasonal asynchrony


Possible mechanisms for animal speciation in the absence of geographic isolation remain controversial. Univoltine flies of the Rhagoletis pomonella sibling species group of larval fruit parasites have been cited1–5 as prime examples of sympatric speciation through divergence in host plant association. The recent emergence of several populations of R. pomonella associated with plants other than the fly's native hawthorn host has been attributed to the effects described by a model2–4 of sympatric host-race formation involving host recognition and survival genes; however, direct genetic evidence of biologically meaningful differentiation among putative host races has been lacking. In contrast, the potential importance of seasonal asynchrony (of flies adapted to host plants with different fruiting phenologies) in initial restriction of gene flow has been largely undervalued. Here I report heritable divergence in seasonal emergence of R. pomonella flies collected from sympatric populations on three host plant species in Illinois, in the United States.

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Smith, D. Heritable divergence of Rhagoletis pomonella host races by seasonal asynchrony. Nature 336, 66–67 (1988).

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