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).
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Communication N0 301 of the Biological Station, Wijster
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van der Eijk, R.H. Population dynamics of gyrinid beetles. Oecologia 69, 41–46 (1986). https://doi.org/10.1007/BF00399035
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DOI: https://doi.org/10.1007/BF00399035