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| Effects of environmental factors on the composition of phytoplankton community in Sankou of the Yangtze River and the Western Dongting Lake |
| YAN Guang-han1,2,3, YIN Xue-yan1,2, WANG Xing1,2,3, WANG Li-jing3,4, LI Ying-jie3,4, LI Hong3,4, CHEN Wei3 |
1. National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. State Environmental Protection Key Laboratory of Drinking Water Source Protection, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3. State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Chinese Research Academy of Environmental Sciences, Yueyang 414000, China;
4. Research Center of Ecological Environment for Yangtze River Economic Belt, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract To evaluate characteristics of phytoplankton community structure and main environmental impact factors in the "Sankou" of Yangtze River and the Western Dongting Lake, phytoplankton from 18 sampling sites which distributed in "Sankou" and Western Dongting Lake were investigated in November 2016, March and August 2017. 72 species of six phyla was detected, and the phytoplankton density was in a range from 1.32 to 275×104cells/L with the lowest in November and the highest in August, which the average density was 32.75×104cells/L. The average density in Sankou of Yangtze River and the West Dongting Lake were 35.39×104cells/L and 25.88×104cells/L, respectively. In terms of dominant groups, Synedra acus, Navicula pupula and Stauroneis smithii Grun dominated in "Sankou" of the Yangtze River, and the West Dongting Lake is dominated by the Phormidium tenue of Cyanophyta, Chlorella, vulgaris and Scenedesmus quadricauda of Chlorophyta. In terms of diversity, the Shannon-Wienner index and the Margalef index of the "Sankou" of the Yangtze River were 1.31 and 1.01, while that were 1.40 and 1.10 in the West Dongting Lake, respectively. The CCA analysis of phytoplankton and water environmental factors indicated that, water temperature (WT), total nitrogen (TN) and total phosphorus (TP) were the main factors affecting the distribution of phytoplankton in "Sankou" of Yangtze River, while WT and pH were main factors of distribution phytoplankton in the Western Dongting Lake.
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Received: 06 November 2018
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