Rotifer community structure and assessment of water quality in Yangcheng Lake |
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| Authors: | Lijing Chen Qiao Liu Ziran Peng Zhongjun Hu Junzeng Xue Wu Wang |
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| Institution: | 1. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (MOE-affiliated), Shanghai Ocean University, Shanghai, 201305, China
2. Ministry of Agriculture Key Laboratory of Aquatic Genetic Resources and Aquaculture Ecology, Shanghai Ocean University, Shanghai, 201306, China
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| Abstract: | Rotifer community structure was investigated in Yangcheng Lake in 2008. Dominant species and species diversity indices were
determined and Q
B/T was used to assess water quality. The annual average density and biomass of the rotifers in Yangcheng Lake was 2 894 ± 1
006 ind./L and 12.47 ± 10.28 mg/L, respectively. The highest densities were observed in the western portion of the lake in
March, but the highest biomass occurred in inflowing creeks in September. Within a year of monitoring in Yangcheng Lake, 93
species were identified and the dominant species were found to be Polyarthra trigla, Brachionus angularis, Keratella cochlearis, Keratella valga, Brachionus calyciflorus, and Filinia major. Of the species recorded, 75 were pollution indicator species. Density and biomass exhibited significant positive correlations
with water temperature (R = 0.209, P = 0.003; R = 0.446, P = 0.000), but the peak density showed two lags in response to chl a. According to the Jaccard similarity index (S
J), the greatest similarity among dominant species occurred between creeks and the eastern part of the lake. The annual average
Shannon-Wiener diversity index H′, Margalef richness index D and Pielou evenness index J were 1.96 ± 0.34, 1.61 ± 0.50 and 0.77 ± 0.10, respectively. In all four areas of Yangcheng Lake, β-mesosaprobic species
comprised the largest share of pollution indicator species. These data suggest that Yangcheng Lake is mesosaprobic. |
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| Keywords: | rotifer density biomass water quality |
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