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Population Dynamics of the Large Pond-Skater Gerris najas Degeer (Hemiptera-Heteroptera)

R. O. Brinkhurst
Journal of Animal Ecology
Vol. 35, No. 1 (Feb., 1966), pp. 13-25
DOI: 10.2307/2686
Stable URL: http://www.jstor.org/stable/2686
Page Count: 13
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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.
Population Dynamics of the Large Pond-Skater Gerris najas Degeer (Hemiptera-Heteroptera)
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Abstract

1. Population fluctuations of Gerris najas in boathouses on Windermere were followed for 9 years. The adults showed an overwintering mortality which averaged 80%. This mortality was not related to the population size. 2. Assuming a constant potential rate of increase, mortality during recruiting was positively density-dependent. The causative agent of this mortality is thought to be cannibalism among the nymphs, and evidence is presented to support this contention. 3. The simplest interpretation of the sample data is that the intraspecific density-dependent factor operated at all population levels; it was certainly not a rarely-used mechanism operating only at abnormally high population levels.

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