Egg production rate of the copepod <Emphasis Type="Italic">Calanus sinicus</Emphasis> off the Korean coast of the Yellow Sea during spring |
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| Authors: | Hyung-Ku Kang Chang-Rae Lee Keun-Hyung Choi |
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| Institution: | (1) School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia;(2) Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 192-8577 Hachioji, Tokyo, Japan;(3) Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039-0628, USA; |
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| Abstract: | The egg production rate (EPR) of Calanus sinicus was measured from March 2007 to April 2010 at three stations along the Korean coast of the Yellow Sea (in coastal waters
off Saemangum, Yeongheungdo, and Asan Bay) to estimate in situ maximum egg production rate (MEPR) and to understand whether the females were limited in their growth or fecundity in the
field. The mean EPR of C. sinicus at each sampling date ranged from 10.3–34.9 eggs female−1 d−1 (mean 23.4 eggs female−1 d−1), and the EPR of individual copepods ranged from 0–81 eggs female−1 d−1. The mean EPR was positively correlated with the body weight of female copepods. The MEPR at each sampling date ranged from
40–81 eggs female−1 d−1 (mean 50.4 eggs female−1 d−1). Over 84% of eggs spawned hatched successfully. The weight-specific growth rate (WSGR) ranged from 0.038–0.111 d−1 (mean 0.082 d−1), indicating that 3.8–11.1% of the carbon in an adult female was produced daily as female growth. The WSGR was negatively
correlated with water temperature. The ratio of mean EPR to observed mean MEPR ranged from 20–70% (mean 46%), indicating that
∼54% of a female’s growth might be limited in the field. We suggest that the ratio of observed EPR to mean MEPR of copepod
can be applied to understand how the copepod responds to environmental changes, as well as EPR and hatching success. |
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