Current fish community structure and its relationship with environmental factors in Gucheng Lake, Nanjing China
LIU Pengfei, JING Li, REN Long, KUANG Zhen, ZHAN Zhengjun, HU Changsui, XU Dongpo*
1.Yangtze River Downstream Fisheries Resources and Environmental Science Observation Station, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China; 2.College of Wuxi Fisheries，Nanjing Agricultural University, Wuxi 214081, China
Abstract: In order to understand the current status of fish communities in Gucheng Lake (30°14′-31°18′N, 118°53′-118°57′E), fish community structure was surveyed in 8 sampling sites in Gucheng Lake, a land-sealed lake in the lower reaches of the Yangtze River in January (winter), July (summer), November (autumn) 2017 and April 2018 (spring) by multi-mesh sized gillnets and fixed series cage traps. Water quality was quantitatively determined in Gucheng Lake and relationship between the structure of fish communities and environmental factors was analyzed. A total of 29 species of fish were collected in the survey, belonging to 22 genera, 6 families and 5 orders, with the vast majority (25 species) in Cypriniformes, accounting for 86.21% of the number of fish species. There was only dominant species Toxabramisswinhonis, without significant temporal and spatial difference in fish diversity index (P>0.05), and with low level of the Shannon-Wiener diversity index (H). The RDA analysis revealed that total nitrogen content (TN), permanganate index (CODMn), and turbidity (TUR) led to significant effects on the temporal and spatial differences of fish community structure (P<0.05). From 2017 to 2018, the fish resources of Gucheng Lake were declined significantly compared with those in the 1980s,the number of species declined by 64.63%. It is suggested that the restoration of fishery resources be promoted by improving hydrological connectivity in the basin and by promoting ecological fishery in large water areas. To a certain extent, the finding has supplemented the gaps in the study of fish communities in Gucheng Lake in the new era, and has to some extent significance in the protection of fish resources in the waters.
刘鹏飞, 景丽, 任泷, 匡箴, 詹政军, 胡长岁, 徐东坡. 固城湖鱼类群落结构现状及其与环境因子的关系[J]. 大连海洋大学学报, 2022, 37(5): 841-849.
LIU Pengfei, JING Li, REN Long, KUANG Zhen, ZHAN Zhengjun, HU Changsui, XU Dongpo. Current fish community structure and its relationship with environmental factors in Gucheng Lake, Nanjing China. Journal of Dalian Ocean University, 2022, 37(5): 841-849.
2022, Vol. 37 
