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JPR Advance Access published online on June 1, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh101
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Received January 15, 2004
Accepted May 26, 2004

Article

Life history strategies of Calanus sinicus in the southern Yellow Sea in summer

Xin-Ming Pu 1, Song Sun 2*, Bo Yang 2, Guang-Tao Zhang 1, Fang Zhang 2

1 Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology, Chinese Academy of Sciences Qingdao 266071, China; Graduate School, Chinese Academy of Sciences Beijing 100093, China
2 Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology, Chinese Academy of Sciences Qingdao 266071, China

* To whom correspondence should be addressed. E-mail: sunsong{at}ms.qdio.ac.cn.


  Abstract

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 the southern Yellow Sea, a shift of the stage composition occurs from eggnauplius dominated to the fifth copepodite (CV) dominated. 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 are 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. siniucs to live through the warm and food-limited summer in the central part the southern Yellow Sea; both low temperature and low food supply are indispensable for CV to maintain the resting state in the YSCWM. C. sinicus exhibits different life history strategies in different regions in the southern Yellow Sea in summer.


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