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Life History Variations in An Association of Odonata
- Kormondy, Edward J., Gower, Jennett L.
- Ecology 1965 v.46 no.6 pp. 882-886
- Odonata, adults, habitat preferences, larvae, larval development, life history, population size, sex ratio, vegetation, Pennsylvania
- Seventeen species of Odonata occurring in east Twin Pond, Crawford Co., Pennsylvania, were studied over two adult seasons between June 1961 and September 1962. Emphasis was on larval growth patterns, emergence patterns, adult population size and sex ratio, and habitat selection. One— and two—year larval growth patterns with varying degrees of uniformity in age class distribution were observed. The species will overwintered as larvae with cessation of growth. Considerable annual variation existed in each species in: onset, peak and duration of emergence period; the degree of synchrony of emergence; population size; sex ratio. The variations showed no consistent pattern of alternation among the different species suggesting plasticity of response to differential influences. Distribution appears to be clumped and determined largely by the vegetation.