Multiple Insemination and Male Sexual Selection in Natural Populations of Drosophila pseudoobscura

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Abstract
Data are presented which indicate a high frequency of concurrent multiple paternity in the progeny of females in a natural population of D. pseudoobscura. A probability model is presented and used to obtain maximum-likelihood estimates of parameters describing the pattern of sperm use and the amount of concurrent multiple paternity in several population samples. The probability that 2 randomly selected offspring from a single randomly selected female have the same father was .79. Estimates of effective mating frequency of male genotypes suggest that 1 of the samples came from a population in which there was nonrandom mating. Some evolutionary consequences of multiple matings in Drosophila are discussed.