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Effects of Water Mite Parasitism on the Demographics of an Adult Population of Ischnura posita (Hagen) (Odonata: Coenagrionidae)

James V. Robinson
The American Midland Naturalist
Vol. 109, No. 1 (Jan., 1983), pp. 169-174
DOI: 10.2307/2425527
Stable URL: http://www.jstor.org/stable/2425527
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Water Mite Parasitism on the Demographics of an Adult Population of Ischnura posita (Hagen) (Odonata: Coenagrionidae)
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Abstract

The demographics of an adult population of Ischnura posita (Hagen) (Odonata: Coenagrionidae) at a N Texas pond were studied using mark-recapture techniques. Twenty-three percent of marked females were recaptured vs. 20 percent of the males; the highest recapture rate was for mature females not parasitized by water mites. The average daily probability of survivorship ranged from 0.73 for mite-free mature females to 0.61 for mite-parasitized mature females. Water mites were present on one-half the population and were more frequent on males than females. The number of individuals displayed a marked peak during the study This peak was coincident with the only observed cases of adult cannibalism.

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