Journal of Oceanology and Limnology

, Volume 36, Issue 1, pp 92–104 | Cite as

Spatial contrast in phytoplankton, bacteria and microzooplankton grazing between the eutrophic Yellow Sea and the oligotrophic South China Sea

  • Yafeng Zhang (张亚锋)
  • Xutao Wang (王旭涛)
  • Kedong Yin (殷克东)
Article

Abstract

Three cruises were conducted to investigate the distributions of nutrients, chlorophyll a (Chl-a), new and regenerated primary production, bacterial abundance and production, and microzooplankton grazing rates in the Yellow Sea (YS) and the South China Sea (SCS) during March and May. As the water column moved from low to high temperature, weak to strong stratification and high to low nutrients from the YS to the SCS, Chl-a, primary production and bacterial biomass decreased. In contrast, bacterial production, microzooplankton grazing and size preference increased from the YS to the SCS. The increasing grazing activity and decreasing f-ratio from the YS to the SCS suggest roles of regenerated nutrients in the supporting the community increased and more bacteria played important roles in the carbon flow in the oligotrophic SCS than in the eutrophic YS. These variabilities force the classical food chain dominated community in the eutrophic waters into the microbial loop, which is dominant in oligotrophic waters. As nutrients decrease, temperature and grazing activity increase from the YS to the SCS. The increasing ratio of integrated bacterial production to integrated primary production indicates that communities change from autotrophy to heterotrophy and waters change from a carbon sink to a carbon source.

Keywords

bacterial production primary production nutrient supply grazing activity Yellow Sea South China Sea 

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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yafeng Zhang (张亚锋)
    • 1
    • 2
  • Xutao Wang (王旭涛)
    • 3
  • Kedong Yin (殷克东)
    • 1
    • 2
  1. 1.School of Marine SciencesSun Yat-Sen UniversityGuangzhouChina
  2. 2.Key Laboratory of Marine Resources and Coastal Engineering in Guangdong ProvinceGuangzhouChina
  3. 3.Scientific Institute of Pearl River Water Resources ProtectionGuangzhouChina

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