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Life cycles in marine meiobenthos. Experiments at various temperatures with Monhystera disjuncta and Theristus pertenuis (Nematoda)
Gerlach, S.A.; Schrage, M. (1971). Life cycles in marine meiobenthos. Experiments at various temperatures with Monhystera disjuncta and Theristus pertenuis (Nematoda). Mar. Biol. (Berl.) 9(3): 274-280
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Gerlach, S.A.
  • Schrage, M.

Abstract
    M. disjuncta and T. pertenuis were cultured on seawater agar in Boveri dishes at various temps. Generation time was measured as the period elapsing in 2 consecutive generations between the 1st egg deposit, the, 1st hatching, or the 1st appearance of sexual characters. M. disjuncta has a generation time of 13 days at 17° to 22° C. 15 days at 13° to 15° C, 17 days at 9° to 12° C, 22 days at 7° C, 77 days at 0° to 2° C, and 135 days at -1° to 1° C. Low temps result sometimes in vivipary. T. pertenuis has a generation time of 23 days at 17° to 22° C, 41 days at 13° to 15° C, 47 days at 9° to 12° C, and 71 days at 7° C. M. disjuncta females live for up to 61 days at 17° to 22° C, T. pertenuis females up to 208 days at 7° C. Under North Sea temp conditions 17 generations of M. disjuncta and 7 generations of T. pertenuis could occur during the course of 1 yr (calculation based upon experiments giving the shortest possible generation time). Females deposit eggs over a couple of days, therefore, the medium generation time is longer, and there will be fewer generations per year in the sea.

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