Density‐dependent changes in sex ratio in Colias lesbia (Lepidoptera: Pieridae)

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Abstract
The changes in sex ratio of a population of Colias lesbia were studied for four consecutive years. A constant sex ratio was found in the samples taken in the 34 days following the last harvest of the alfalfa. For the samples taken 35 or more days after the harvest the sex ratio decreases as the total number of adults caught increases. The indirect evidence collected suggests that differences in emigration tendencies between sexes play a major role in determining the sex ratio in this species.