Primary research paper

Hydrobiologia

, Volume 598, Issue 1, pp 35-45

First online:

The distributions of autumn picoplankton in relation to environmental factors in the reservoirs along the Wujiang River in Guizhou Province, SW China

  • Baoli WangAffiliated withState Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences Email author 
  • , Cong-Qiang LiuAffiliated withState Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
  • , Fushun WangAffiliated withInstitute of Applied Radiation, School of Environmental and Chemical Engineering, Shanghai University
  • , Yuanxiu YuAffiliated withState Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of SciencesGraduate School, Chinese Academy of Sciences
  • , Lihua ZhangAffiliated withState Key Laboratory of Estuarine and Coastal Research, East China Normal University

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Abstract

Autumn picoplankton (Synechococcus, picoeukaryotes and heterotrophic bacteria) and environmental factors have been investigated in a series of reservoirs along the Wujiang River in Guizhou Province, SW China. The average abundances of Synechococcus, picoeukaryotes and heterotrophic bacteria was 104, 102 and 106 cells ml−1, respectively. In autumn meso-eutrophic reservoirs, thermal stratification was clear and abundances of different picoplankton groups in release water was low; whereas these phenomena were not obvious in autumn hypereutrophic reservoir. Picoplankton numbers decreased with increasing water depth and showed a positive correlation with water temperature, which reflected the importance of light and temperature on the picoplankton growth. Contribution of Synechococcus to total phytoplankton production and contribution of picoeukaryotes to total phytoplankton production asynchronous changed with varying trophic states. Synechococcus preferred meso-eutrophic reservoirs over hypereutrophic reservoir and picoeukaryotes showed no preference for the investigated reservoirs in autumn.

Keywords

Synechococcus Picoeukaryotes Heterotrophic bacteria Temperature