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JPR Advance Access published online on December 22, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh164
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Journal of Plankton Research, © Oxford University Press 2004; all rights reserved
Received June 23, 2004
Accepted November 15, 2004

Article

Seasonal variation of reproduction rates and body size of Calanus sinicus in the Southern Yellow Sea, China

Guang-Tao Zhang 1, Song Sun 1*, and Fang Zhang 1

1 (Key Laboratory of Marine Ecology & Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China)

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


  Abstract

Annual variations of egg production rate (EPR) and clutch size of Calanus sinicus, as well as body size of females (prosome length and dry weight), were investigated at a series of stations in the Southern Yellow Sea by onboard incubation. C. sinicus was spawning in all the 11 cruises investigated, and the annual variation of EPR was bimodal. Monthly average EPR was highest from May to July, respectively 5.97, 5.36 and 6.30 eggs female-1 d-1, then decreased dramatically to only 1.37 eggs female-1 d-1 in August and attained the lowest 1.07 eggs female-1 d-1 in October. In November, average EPR increased again to 4.31 eggs female-1 d-1. Seasonal variation of clutch size was similar to EPR, except that it decreased gradually after August rather than dramatically as did EPR. Prosome length of females was maximum in May and minimum in October, but dry weight was highest in November. Monthly average EPR correlated better with prosome length than dry weight, while clutch size was rather determined by dry weight of females. It is suggested that egg production of Calanus sinicus was active during two discontinuous periods when both surface and bottom temperature fell into its favorite range (i.e. 10-23°C), and different reproductive strategies were adopted in these two reproductive peaks: other than the highest EPR, longer prosome length was also achieved by C. sinicus from May to July, while females in November developed shorter bodies but accumulated more energy for reproduction.


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