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Multiple Mating and Effective Population Size in Cepaea nemoralis

James Murray
Evolution
Vol. 18, No. 2 (Jun., 1964), pp. 283-291
DOI: 10.2307/2406402
Stable URL: http://www.jstor.org/stable/2406402
Page Count: 9
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Multiple Mating and Effective Population Size in Cepaea nemoralis
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Abstract

1. The land snail, Cepaea nemoralis (L.), is hermaphroditic with obligatory cross-fertilization. The breeding system of its populations includes both multiple mating and sperm storage. 2. The mean number of matings contributing to each brood is estimated to be not less than two. 3. There is some evidence of differential fertility between yellow and pink "male" parents. 4. Multiple mating and sperm storage serve to minimize the effects of population fluctuations and of increased variance of brood size which might otherwise reduce the effective size of populations.

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