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JPR Advance Access originally published online on April 3, 2007
Journal of Plankton Research 2007 29(5):437-446; doi:10.1093/plankt/fbm028
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Seasonal reproductive biology of Centropages tenuiremis (copepoda) in Xiamen waters, People's Republic of China

Li-Sheng Wu, Gui-Zhong Wang*, Xiao-Dong Jiang{dagger} and Shao-Jing Li

Department of Oceanography, State key laboratory of Marine environmental science, Xiamen University, 422 Siming sOUTH rOad, xiamen 361005, People's Republic of China

* corresponding author: gzwang{at}xmu.edu.cn

Received on November 9, 2006; accepted on March 28, 2007


  Abstract

The egg production rate (EPR) and the effects of environmental variations on diapause induction in the copepod Centropages tenuiremis in Xiamen waters were studied in 2002 and 2003. The EPR ranged from 7.33 ± 8.14 (on 18 February 2003) to 91.08 ± 20.61 (on 6 June 2003) eggs female–1day–1 (mean ± 95% confidence limits), and displayed a significant seasonal pattern. Before the period of maximum egg production, EPR increased with seawater temperature and chlorophyll a concentration; but after the maximum, no significant relationship was found between EPR and chlorophyll a concentration, and there was a negative linear relationship between EPR and temperature. Seawater temperature and photoperiod, respectively, played a primary role in the switch to diapause egg production by the females as shown by single-factor probit analysis. However, the difference in effect between the two factors was demonstrated by binary logistic multivariate analysis. These results suggest that this copepod rapidly increases subitaneous EPR by taking full advantage of conditions in favorable seasons (winter and spring). Subitaneous EPR decreases and there is a switch to the production of diapause eggs that survive in the bottom sediments during unfavorable seasons (summer and autumn) in Xiamen waters.

{dagger} Present address: Polar Research Institute of China, 451 Jinqiao road, Shanghai 200136, People's Republic of China

Communicating editor: R.P. Harris


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