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Mating pairs and nonmating individuals of the grasshopper Eyprepocnemis plorans were collected in a natural population during the 1992 season, in order to determine whether sexual preferences of males and females are correlated with various morphological and physiological characters. These included condition based on body size and somatic and gonadal weight. A comparison of frequency distributions for these characters between the two types of individuals showed that mating frequency (the probability of being sampled while mating) was independent of the characters measured in males but was highly significantly dependent on somatic condition in females. Mating females showed a better somatic condition (defined as the residuals of the regression of somatic weight on body size) than nonmating ones. The implications of this finding in shaping the polygynandrous mating system of this species are discussed.

Somatic condition determines female mating frequency in a field population of the grasshopper Eyprepocnemis plorans