A demographic study of the life cycle of Tisbe furcata (Baird, 1837) (Copepoda: Harpacticoida)
作者： Marc Bergmans
DOI: 10.1017/S0025315400048141
关键词: Zoology 、 Population 、 Harpacticoida 、 Tisbe furcata 、 Copepod 、 Generation time 、 Net reproductive rate 、 Biology 、 Rate of natural increase 、 Demographic study
摘要: The life-cycle of the harpacticoid copepod Tisbe furcata (Baird, 1837) at 18 C was studied quantitatively. Stage durations were determined by two different methods, using synchronous cohorts. Combined nauplius stages last for 80·4 h; successive copepodite take 23·0, 23·2, 28·0 (♀) to 23·2 (♂), 33·4 24·2 (♂) and 48·8 34·7 h, respectively. Females develop more slowly but synchronously than males. Age-specific survival fertility rates used calculate stable stage distribution in an exponentially growing population. From life-table data following demographic parameters computed: intrinsic rate natural increase rm = 0·233 day−1; net reproductive Ro 94; minimum generation time Tmin 14·9 days; related ‘generation time’: T 19·5 days, 16·4 Tc 25·4 days.
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