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Sympatric Host Race Formation and Speciation in Frugivorous Flies of the Genus Rhagoletis (Diptera, Tephritidae)

Guy L. Bush
Evolution
Vol. 23, No. 2 (Jun., 1969), pp. 237-251
DOI: 10.2307/2406788
Stable URL: http://www.jstor.org/stable/2406788
Page Count: 15
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Abstract

Courtship and mating in univoltine frugivorous Rhagoletis species occur on the larval host plant. Thus, there is a direct correlation between mate and host selection. This characteristic, coupled with other biological attributes of the genus and evidence provided from studies on recently established host races, suggests that some members of certain groups of sibling species may have evolved sympatrically as a result of minor alterations in genes associated with host plant selection. Other factors such as allochronic isolation on unrelated plants with different fruiting times, disruptive selection, conditioning, and semigeographic isolation, which might enhance the reproductive isolation between a recently established host race and its parent population, are discussed. It is concluded that such factors may considerably reduce gene flow between host races and lead to the rapid sympatric evolution of host races and sibling species.

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