Abstract
The temperature effect on the development of Calanoid copepod,Acartia tsuensis, was investigated in the laboratory.A. tsuensis could develop from eggs to adults within the water temperature range of 17.5–30.0°C. The relationship between the duration required to attain a developmental stagei (Di; days) and water temperature (T; °C) was expressed asDi=Ai(T−1)−2.05, whereAi is a coefficient obtained for the stagei. A. tsuensis developed isochronally at 20.0–27.5°C, while the instar duration of advanced nauplii and copepodids tended to be longer at 17.5°C and 30.0°C. Quadratic equations could be applied to express the relationship between stage-specific mortality coefficients and water temperature with the minimu mortality observed at 22.5°C from egg to nauplius stage 3 (N−3) and at 25.0°C from N−3 to copepodide stage 6. Fecundity at 22.5–30.0°C was larger (7.9–13.5 eggs/female/day) than that at 17.5–20.0°C (0–2.6 eggs/female/day). These observations indicate thatA. tsuensis adapts well physiologically in a warmwater environment with an optimal water temperature of about 25°C. The study includes morphological description ofA. tsuensis, because the species seems to have been often confused with otherAcartia species, such asA. omorii occurring in a similar locality, due largely to lack of the information on the morphological characters of the nauplii and early copepodids.
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Takahashi, T., Ohno, A. The temperature effect on the development of Calanoid copepod,Acartia tsuensis, with some comments to morphogenesis. J Oceanogr 52, 125–137 (1996). https://doi.org/10.1007/BF02236536
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DOI: https://doi.org/10.1007/BF02236536