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ZHANG Lei, LI Li, LIU Mengna, HU Yao, JIANG Jiahu. Temporal and spatial variations of bacterial community compositions in two estuaries of Chaohu Lake[J]. HaiyangYuHuZhao, 2020, 38(3): 745-758

Temporal and spatial variations of bacterial community compositions in two estuaries of Chaohu Lake

ZHANG Lei1,2, LI Li2, LIU Mengna2, HU Yao2, JIANG Jiahu1
1 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008;
2 School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China
The distinctive estuary hydrodynamics and nutrient input make the estuary ecosystem play a key role in lake ecosystems. The Nanfei River and Zhaohe River are two main inlets of Chaohu Lake, Anhui, East China. We selected estuaries of the two rivers as representative areas to study temporal and spatial changes of bacterial communities. In August (summer) and November (autumn) 2016 and February (winter) and May (spring) 2017, 16 water and sediment samples were collected from the estuaries. Physicochemical characteristics indicate significant differences in the nutritional status and eutrophication index of the estuaries due mainly to organic input. Examination of the number of operational taxonomic units, the diversity index, the community composition, and redundancy analysis revealed the following. First, the existence of varying degrees of seasonal differences in the distribution of almost all bacteria. In addition, the species diversity in the sediment samples was higher than that in the water samples, and the dominant species differed also among these samples. Second, a large number of unknown genera were detected, especially in the sediment samples, such as unclassified Xanthomonadales incertae sedis, unclassified Anaerolineaceae, and unclassified Alcaligenaceae. Last, TP, TN, and TOC were the main influential factors that affected the bacterial community structure.
Key words:    estuary|water and sediment|bacterial diversity|bacterial community structure   
Received: 2019-04-19   Revised: 2019-08-05
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