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Calculation of the Intrinsic Rate of Natural Increase, rm, With Rhabditis Marina Bastian 1865 (Nematoda)

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The life-cycle of Rhabditis marina Bastian 1865 was studied at 25°C and 20‰ salinity. The following demographic parameters were computed from life-table data: the intrinsic rate of natural increase (rm) = 0.914 day; net reproductivity (Ro) = 400; minimum generation time (Tmin) = 4.5 days; cohort generation time (Tc) = 7.2 days; mean generation time (T) = 6.6 days; and the age of an adult female when a median egg is deposited (T) = 6.1 days. Several approximate equations used to estimate rm were compared with these life-table calculations. Some give erroneous estimations and should be used with extreme caution. For iteroparous organisms (including most free-living nematodes), Tmin only gives an indication of the development time and is therefore unsuitable for describing 'mean generation time'.

Affiliations: 1: Instituut voor Dierkunde, Rijksuniversiteit Gent, Ledeganckstraat 35, B-9000 Gent, Belgium

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/content/journals/10.1163/187529283x00348
1983-01-01
2016-12-08

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