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Behavioral Reproductive Isolation Among Populations of the Rotifer brachionus plicatilis

Terry W. Snell and Craig A. Hawkinson
Evolution
Vol. 37, No. 6 (Nov., 1983), pp. 1294-1305
DOI: 10.2307/2408849
Stable URL: http://www.jstor.org/stable/2408849
Page Count: 12
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Behavioral Reproductive Isolation Among Populations of the Rotifer brachionus plicatilis
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Abstract

Behavioral reproductive isolation among populations of the brackish-water rotifer Brachionus plicatilis is examined from a variety of perspectives. Male mating preferences differ between spatially separated populations from the same local area as well as geographically separated populations from different biogeographical regions. No mating preferences, however, could be detected among temporally separated populations from the same bay. An examination of male and female contributions to this behavioral reproductive isolation revealed that each sex makes an approximately equal contribution. As predicted by several authors, a comparison of sympatric and allopatric populations showed that sympatric populations were more strongly reproductively isolated than allopatric ones. Asymmetries in male mating preferences were recorded among several populations. These asymmetrical mating preferences are discussed with regard to current theory and an alternate explanation is proposed.

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