How often does sympatry affect sexual isolation in Drosophila?

Article Abstract:

A new method of estimating a lower bound of how often sympatric species interactions elevate prezygotic isolation in Drosophila is presented. The conclusion of an earlier study that prezygotic reproductive isolation in sympatric Drosophila species pairs was greater than in allopatric pairs of similar genetic divergence was affirmed, as sympatry with closely related species was found to be associated with elevated sexual isolation among Drosophila species. Such elevations were also found to be not a rare occurrence, as sympatry was found to have increased sexual isolation of Drosophila species in >21% of the phylogenies which fit the model's criteria.

Isolating mechanisms

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The effects of selection and bottlenecks on male mating success in peripheral isolates

Article Abstract:

A sample of Drosophila melanogaster taken from a large, randomly mating stock of flies captured in Dahomey was examined to determine whether the probability of nonramdom mating between ancestral populations and small founder populations located at the edge of the flies' range is affected by affected by founder events and a novel environment. The study focused on two mating components that can affect gene flow, namely, male mating success and assortative mating. The findings are discussed.

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Forced matings in natural populations of Drosophila

Article Abstract:

Evidence is presented that many Drosophila females are not able to participate in mate selection when copulation takes place. Male flies often wait for females to emerge from the pupal state and then mate immediately with them, without waiting for a stereotypical acceptance signal.

United States, Statistical Data Included, Rape

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