van der Eijk R H
Biological Station Wijster, Kampsweg 27, 9418 PD, Wijster, The Netherlands.
Oecologia. 1986 Apr;69(1):41-46. doi: 10.1007/BF00399035.
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).
根据1974 - 1978年的标记重捕序列，估算了水甲虫黄斑龙虱种群的存活几率。春季平均每周存活几率估计为0.9247，秋季降至0.7701；雄性比雌性存活时间长。存活情况在时间或空间上变化不大（变异系数V<0.1）。存活几率不会随年龄显著降低。刚羽化的嫩虫显然比老甲虫的存活几率低。冬眠期间（10月至次年4月）的存活几率约为0.33，年份间的变异（V = 0.7）大于种群间的变异（V = 0.4）。
