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Marine Ecology Progress Series

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MEPS 379:123-133 (2009)  -  DOI:

Spring and autumn reproduction of Calanus sinicus in the Yellow Sea

Shiwei Wang1,2, Chaolun Li1, Song Sun1,3,*, Xiuren Ning4, Wuchang Zhang1

1Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, PR China
2Graduate University, Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, PR China
3Jiaozhou Bay Marine Ecosystem Research Station, Chinese Ecosystem Research Network, 7 Nanhai Road, Qingdao 266071, PR China
4Key Laboratory of Marine Biology and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, 36 Baochu North Road, Hangzhou 310012, PR China
*Corresponding author. Email:

ABSTRACT: The fecundity, hatching success and naupliar survival of Calanus sinicus were studied in the Yellow Sea during research cruises in April and October 2006, with emphasis on the regulation of reproduction. During both cruises, the egg production rate (EPR) showed large spatial variations (0 to 25.4 eggs female–1 d–1), generally coinciding with the food availability. In April, the abundant phytoplankton and ciliates in the study area supported active reproduction, which would probably initiate the annual population development. In October, females remained immature in the Yellow Sea Cold Water Mass, likely due to the unfavorable environment (poor food and low temperature). However, reproduction and recruitment were high in the neritic region, which may explain the local population recovery in late autumn. Hatching success varied markedly among stations in April (4 to 85%), whereas it was high overall in the neritic region during October (>90%). Based on the potential recruitment rates, the spring recruitment would be more important for the annual population dynamics. Female gonad maturity, body size and lipid reserve were examined in relation to fecundity. Regression analyses suggested that the reproductive index (defined as the proportion of females with mature gonads) could be an indicator for the EPR of C. sinicus. Among the regulating factors, external food (ciliates and phytoplankton) seems essential for reproduction, whereas inner lipid reserve may mainly serve metabolic needs. Moreover, fecundity is positively related to body size but independent of temperature, which might exert indirect influences on reproduction.

KEY WORDS: Calanus sinicus · Reproduction · Gonad maturity · Food limitation · Yellow Sea

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Cite this article as: Wang S, Li C, Sun S, Ning X, Zhang W (2009) Spring and autumn reproduction of Calanus sinicus in the Yellow Sea. Mar Ecol Prog Ser 379:123-133.

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