Adult Survival and Movement in Males of the Damselfly Hetaerina cruentata (Odonata: Calopterygidae)
Abstract
During a mark-recapture study of the territorial damselfly Hetaerina cruentata (Rambur), several changes in population size, survivorship and birth rates occurred, probably caused by physical conditions and a natural seasonal decline in population size. The average survival rate of males (expected value per day = 0.978) was the highest reported for the Calopterygidae and possibly all Odonata. This value could have been affected by factors that reduced energy expenditures at the end of the season. Analysis of male dispersion showed aggregated distributions, which are expected for territorial species. While most males dispersed, no age-class showed a tendency to move upstream or downstream. Adult females were rare; however, the sex ratio of nymphs was not significantly different from one.Downloads
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