Population dynamics of gyrinid beetles |
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Authors: | R. H. van der Eijk |
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Affiliation: | (1) Biological Station Wijster, Kampsweg 27, 9418 PD Wijster, The Netherlands;(2) Present address: Roer 65, 9733 AH Groningen, The Netherlands |
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Abstract: | Summary Survival chances have been estimated for populations of the waterbeetle Gyrinus marinus Gyll. from capture-recapture sequences in 1974–1978. The average weekly survival chance is estimated as 0.9247 in spring, decreasing to 0.7701 in autumn; males survive longer than females. Survival shows little variation in time or space (variation coefficient V<0.1). Survival chance did not significantly decrease with age. Freshly emerged tenerals apparently have a lower survival chance than older beetles. The survival chance during hibernation (October–April) is about 0.33, with a greater variation between years (V=0.7) than between populations (V=0.4).Communication N0 301 of the Biological Station, Wijster |
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Keywords: | Diaspididae Water stress Scale Abscission Drought |
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