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Acta Oceanologica Sinica

, Volume 38, Issue 8, pp 56–63 | Cite as

Changes in the population structure of Calanus sinicus during summer-autumn in the southern Yellow Sea

  • Yongqiang Shi
  • Song SunEmail author
  • Chaolun Li
  • Guangtao Zhang
  • Bo Yang
  • Peng Ji
Article

Abstract

Calanus sinicus is a calanoid copepod widely distributed in coastal waters of China and Japan, and oversummering strategies may have major impacts on their population dynamics which in turn affect local marine food web structure. The abundance, stage composition, and sex composition of the planktonic copepod C. sinicus were studied from August to October 2002 in the southern Yellow Sea to understand how its population recovers from the over-summering state. Results showed that C. sinicus had low reproduction in August due to high temperature, except in waters near the Cheju Island with rich food and moderate bottom temperature, but the reproduction rates here decreased in September-October as food availability declined. When temperature dropped in September-October, C. sinicus actively propagated in coastal shallow waters. However, reproduction rates of C. sinicus individuals inhabiting the Yellow Sea Cold Water Mass (YSCWM) remained low during the three months of the study. The percentage of C. sinicus females was high during the reproductive period, which suggests that the sex composition of adult C. sinicus may reflect whether or not the population is in the reproductive mode. Numerous fifth copepodite stage (CV) C. sinicus aggregated in the YSCWM in a suspended developmental stage during the three months of this study, and they potentially served as the parental individuals for population development when conditions became optimal for reproduction later in the year.

Key words

Calanus sinicus stage composition sex composition population structure Yellow Sea Cold Water Mass life history strategy 

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Notes

Acknowledgements

We thank Daji Huang for contributing CTD data and Ruihua Lü for providing chlorophyll a data. We are grateful to the captain and crew of the R/V Beidou for their efforts in the field and to colleagues who provided support during our sampling efforts. We also thank Jenkinson I. for his valuable advice on our manuscript.

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Copyright information

© Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yongqiang Shi
    • 1
    • 2
    • 4
  • Song Sun
    • 1
    • 3
    • 4
    • 5
    • 6
    Email author
  • Chaolun Li
    • 1
    • 4
    • 5
    • 6
  • Guangtao Zhang
    • 3
    • 4
    • 5
    • 6
  • Bo Yang
    • 1
  • Peng Ji
    • 1
  1. 1.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.Key Laboratory of Sustainable Development of Marine Fisheries of Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdaoChina
  3. 3.Jiaozhou Bay National Marine Ecosystem Research Station, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  4. 4.Laboratory for Marine Ecology and Environmental SciencePilot National Laboratory for Marine Science and Technology (Qingdao)QingdaoChina
  5. 5.University of Chinese Academy of SciencesBeijingChina
  6. 6.Center for Ocean Mega Science, Chinese Academy of SciencesQingdaoChina

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