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Calculation of the intrinsic rate of natural increase, rm, with Rhabditis marina Bastian 1865 (Nematoda)
Vranken, G.; Heip, C.H.R. (1983). Calculation of the intrinsic rate of natural increase, rm, with Rhabditis marina Bastian 1865 (Nematoda). Nematologica 29: 468-477
In: Nematologica. Brill: Kobenhavn; Leiden; Köln; New York. ISSN 0028-2596, more
Peer reviewed article  

Also published as
  • Vranken, G.; Heip, C.H.R. (1983). Calculation of the intrinsic rate of natural increase, rm, with Rhabditis marina Bastian 1865 (Nematoda), in: Heip, C.H.R. et al. (Ed.) (1988). Collected papers on meiofauna dynamics and energy flow. : pp. 468-477, more
  • Vranken, G.; Heip, C.H.R. (1985). Calculation of the intrinsic rate of natural increase, rm, with Rhabditis marina Bastian 1865 (Nematoda), in: IZWO Coll. Rep. 15(1985). IZWO Collected Reprints, 15: pp. chapter 2, more

Available in Authors 
    VLIZ: Open Repository 129025 [ OMA ]

Keywords
    Population characteristics; Nematoda [WoRMS]; Rhabditis (Pellioditis) marina (Bastian, 1865) Andrassy, 1984 [WoRMS]; Marine

Authors  Top 
  • Vranken, G.
  • Heip, C.H.R., more

Abstract
    The life-cycle of Rhabditis marina Bastian 1865 was studied at 25°C and 20 promille salinity. The following demographic parameters were computed from life-table data: the intrinsic rate of natural increase (rm) = 0.914 day; net reproductivity (R0) = 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".

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