JPR Advance Access originally published online on June 1, 2004
Journal of Plankton Research 2004 26(9):1059-1068; doi:10.1093/plankt/fbh101
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Journal of Plankton Research Vol. 26 No. 9 © Oxford University Press 2004; all rights reserved
Life history strategies of Calanus sinicus in the southern Yellow Sea in summer
1 Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China and 2 Graduate School, Chinese Academy of Sciences, Beijing 100093, China
* Corresponding Author: sunsong{at}ms.qdio.ac.cn
Received January 15, 2004; accepted in principle April 7, 2004; accepted for publication May 26, 2004; published online June 1, 2004
Ecological and physiological features of the planktonic copepod Calanus sinicus in the southern Yellow Sea in summer were studied to reveal its life history strategy. From the coastal shallow waters to the central part of the southern Yellow Sea, a shift of the stage composition occurs from being dominated by the egg-nauplius stage to being dominated by the fifth copepodite (CV) stage. Most CVs reside in the Yellow Sea Cold Water Mass (YSCWM), where both temperature and food abundance are low. CVs in the YSCWM have longer body lengths, heavier body weights and higher carbon contents than those outside the YSCWM. Onboard incubations show that the development of CVs in the YSCWM is suspended. Energy conservation, development suspension and lack of diel vertical migration (DVM) behavior suggest a diapause status for the CVs in the YSCWM, although vertical distribution patterns indicate the CV individuals are not fully synchronous in physiology and development. This adaptive oversummering strategy would help C. sinicus to live through the warm and food-limited summer in the central part of the southern Yellow Sea; both low temperature and low food supply are necessary for CV to maintain the resting state in the YSCWM. Calanus sinicus exhibits different life history strategies in different regions of the southern Yellow Sea in summer.
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