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Effects of constant and cyclic temperatures at different salinity levels on survival and reproduction in Dinophilus gyrociliatus (Polychaeta: Dinophilidae)

ISSN: 0007-4977 ;EISSN: 1553-6955

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  • Title:
    Effects of constant and cyclic temperatures at different salinity levels on survival and reproduction in Dinophilus gyrociliatus (Polychaeta: Dinophilidae)
  • Author: Aakesson, B ; Costlow, J D
  • Reish, DJ
  • Subjects: Dinophilus gyrociliatus ; Marine ; Polychaeta
  • Description: The effects of temperature and salinity on survival and fecundity of the polychaete Dinophilus gyrociliatus was investigated in 108 temperature/salinity combinations. Population parameters were obtained from a static life table. D. gyrociliatus had a life span of about 10 weeks. The time from zygote to reproduction was 11 days. Peak reproduction occurred in the fourth week. An intrinsic rate of increase, r = 1.2, was observed at 22 degree C and 35 ppt salinity that was close to optimum conditions observed in the temperature/salinity trials. Cyclic temperatures stimulated fecundity relative to comparable constant temperatures. The cycle that came closest to natural temperature fluctuations stimulated fecundity more than other temperature cycles. Cyclic temperatures had no similar effect on survival. At optimum salinities and a temperature range of 20-28 degree C, a trade-off ("cost of reproduction") was observed between survival and fecundity. At cyclic temperatures near the upper thermal limit an increase of the time spent at the high temperature of the cycle negatively affected both survival and fecundity.
  • Creation Date: 1991
  • Language: English
  • Identifier: ISSN: 0007-4977
    EISSN: 1553-6955
  • Source: IngentaConnect Open Access
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