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Responses of Zooplankton Community to Environmental Factors and Phytoplankton Biomass in Lake Nansihu, China

Responses of Zooplankton Community to Environmental Factors and Phytoplankton Biomass in Lake Nansihu, China

Wang Tian1, Huayong Zhang1,*, Jian Zhang2, Lei Zhao1, Mingsheng Miao3 and Hai Huang1

1Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, P.R. China
2School of Environmental Science and Engineering, Shandong University, Jinan 250100, P.R. China
3College of Life Science, Shandong Normal University, Jinan 250014, P.R. China

* Corresponding author: bjecology@gmail.com

ABSTRACT

Seasonal variations of zooplankton community structure and their relationships with both environmental factors and phytoplankton biomass are investigated in Lake Nansihu. A total of 76 zooplankton species were identified in the lake, including 17 protozoa, 36 rotifera, 12 cladocera and 11 copepods species, respectively. Zooplankton species richness changed slightly in the four seasons but varied a lot in different positions. Protozoa was absolutely dominated in zooplankton abundance and its mean value ranged from 2710.2 ind./L in winter to 4259.5 ind./L in spring. Annual average biomasses of protozoa, rotifera, cladocera and copepods were 0.13 mg/L, 0.11 mg/L, 0.63 mg/L and 0.34 mg/L, respectively. The lowest values of zooplankton species richness, abundance and biomass appeared at the site which provides the maximum concentrations of nutrients. Zooplankton communities were more correlated to phytoplankton community biomass than environmental factors. Results of canonical correspondence analysis (CCA) revealed that water temperature, Secchi disk depth (SD), total phosphorus and phytoplankton biomass were the most significant factors that influenced zooplankton. Strong correlations between SD and Brachionus leydigi, Chrysophyta and Diaphanosoma leuchtenbergianum, Cryptophyta and Theopilium, Ascomorpha ovalis, Hexarthra mira were observed during the CCA. These zooplankton species may be used as indicators of relevant variables. Results in this research are very useful in guaranteeing ecological security in Lake Nansihu.

 

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