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The diversity of fish communities and the effects of tidal intensity in the near-shore lower reaches of Yangtze River.

YAN Ming-jun1, HU Chun-ting1, LIN Dan-qing2, MA Feng-jiao3, XU Pao1,2, LIU Kai1,2*   

  1. (1Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, Jiangsu, China; 2Scientific Observing and Experimental Station of Fishery Resources and Environment in the Lower Reaches of the Yangtze River, Ministry of Agriculture, Freshwater Fisheries Research Center, CAFS, Wuxi 214081, Jiangsu, China; 3National Demonstration Center for Experimental Fisheries science Education (Shanghai Ocean University), Shanghai 201306, China).
  • Online:2020-06-10 Published:2020-06-10

Abstract: To understand the diversity of near-shore fish communities in the lower reaches of Yangtze River and the effects of tides on it, we collected fish samples and tide data during four consecutive seasons in the Jingjiang station from 2016 to 2017 and in the Changshu station from 2017 to 2018. The results showed that 61 species fishes were collected from the Jingjiang station, which belongs to 9 orders, 18 families and 47 genera. The dominant species were Hypophthalmichthys molitrix,Coilia nasus, Hemiculter bleekeri, Ctenopharyngodon idellus and Aristichthys nobilis. A total of 41 species were collected from the Changshu station, which belongs to 8 orders, 14 families, 34 genera. The dominant species were Hypophthalmichthys molitrix, Lateolabrax maculatus,Aristichthys nobilis, Parabramis pekinensisand Carassius auratus. Margalefindex, Shannon index, and Simpson index of fish communities in the Jingjiang station were higher than those in the Changshu station, whereas Pielou index was lower than that in the Changshu station. Results from SIMPER analysis showed that the average similarity of community composition among four seasons of the Jingjiang station and Changshu station were  64.5% and 64.7%, respectively. The average dissimilarity between two stations were 61.1%. Correlation analysis results of fish community diversity in each tidal cycle in different seasons showed that, at the 95% confidence interval, species richness, catch weight, Shannon index of the Jingjiang station were significantly positively correlated with the maximum tidal range on the sampling day (P<0.01); the Margalef index and Simpson index were significantly positively correlated with the maximum tidal range (P<0.05), while the number of catches was not significantly correlated with the maximum tidal range. Species richness in Changshu was significantly positively correlated with the maximum tidal range (P<0.05), whereas other indicators were not correlated with the maximum tidal range. Our results provide basic data for the study of fish community diversity, and thus would contribute to the conservation and sustainable utilization of fish resources in the lower reaches of Yangtze River.

Key words: eutrophication., catchment development, Xihu Lake, sediments, diatoms