Characteristics and driving factors of spatiotemporal succession of macrozoobenthos in Poyang Lake
ZOU Liang-hua1,2, ZOU Wei2, ZHANG Qing-ji2,3, LI Ying2,4, GONG Zhi-jun2, ZHANG Yan-jie1, LU Shun-bao1, CAI Yong-jiu2
1. College of Life Sciences, Jiangxi Normal University, Nanchang 330027, China; 2. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 3. School of Geography & Ocean Science, Nanjing University, Nanjing 210023, China; 4. School of Geography science, Southwest University, Chongqing 400715, China
Abstract:Macrozoobenthos community and environmental variables were investigated at 133 sites in Poyang Lake in July 2019. The relationships between macrozoobenthic community structure and environmental factors were examined. A total of 48 species belonging to 7 classes, 16 orders, 22 families and 38 genera were recorded. The average density and biomass of macrozoobenthos were 158.38 ind/m2 and 173.76g/m2, respectively, mainly dominated by Corbicula fluminea,Parafossarulus eximius and Bellamya aeruginosa. In terms of spatial patterns, the whole lake was divided into five areas, including northern, northwest, central, eastern and southern lake areas. One-way ANOVA analysis detected significant differences of physicochemical variables among the five lake areas, while no significant differences in sediment parameters. The community structure of benthic animals among the five lake areas also varied significantly as indicated by one-way analysis of similarity (ANOSIM). Regarding to biodiversity indexes, significantly higher values in northern lake were found than those in other lake areas. Canonical correspondence analyses (CCA) showed that water depth, dissolved oxygen, turbidity, total phosphorus, chlorophyll a, loss on ignition, and sediment type were significantly related to the community structure of macrozoobenthos. In the long term, the biodiversity of macrozoobenthos in Poyang Lake has declined significantly compared with those in their historical condition, with the dominated species changed from large molluscs to small molluscs and insects. Sand mining, changes in hydrological conditions and decline of aquatic vegetation were the main environmental factors regulating the spatiotemporal succession of the macrozoobenthic community structure in Poyang Lake.
邹亮华, 邹伟, 张庆吉, 李颖, 龚志军, 张艳杰, 鲁顺保, 蔡永久. 鄱阳湖大型底栖动物时空演变特征及驱动因素[J]. 中国环境科学, 2021, 41(6): 2881-2892.
ZOU Liang-hua, ZOU Wei, ZHANG Qing-ji, LI Ying, GONG Zhi-jun, ZHANG Yan-jie, LU Shun-bao, CAI Yong-jiu. Characteristics and driving factors of spatiotemporal succession of macrozoobenthos in Poyang Lake. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2881-2892.
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