Biodiv Sci

   

Fish diversity and resource status in the Yangxian Section of the Hanjiang River under the context of inter-basin water transfer

Yang Zhao1,2,Chengyi Niu2,Xuejian Li3,Haibo Liu2,Guang Sun4,Zunlan Luo4,Yahui Zhao2   

  1. 1. College of Life Sciences, Hebei University
    2. Institute of Zoology, Chinese Academy of Sciences
    3. College of Fisheries and Life Science, Shanghai Ocean University
    4. Chinese Research Academy of Environmental Sciences
  • Received:2020-04-20 Revised:2020-06-22 Online:2020-10-20 Published:2020-09-12
  • Contact: Yahui Zhao

Abstract: Abstract: The Yangxian section of the Hanjiang River is an important water source of Hanjiang to Weihe River inter-basin water transfer project. Aiming at this area, we surveyed the fish diversity of main stream and six tributaries from 2016 to 2017. With historical data, our survey showed that the investigation area has 76 native species belonging to 57 genera, 14 families, and 6 orders. Fishes from Cyprinidae and Bagridae are dominant, accounting for 57.89% and 11.84% of the total number of native species, respectively. There are five endangered species. And two of them are classified as second-class state-protected wild animals in China. Fish composition and diversity showed distinctive differences between the main streams and branches by indexes of Margalef, Shannon-Wiener, Pielou’s, and Jaccard. The analysis of the Abundance Biomass Comparison indicated that the fish community has been seriously disturbed. Water conservancy and hydropower projects are the main influences on decreasing of fish diversity and populations. The construction of large dams on the main stream will cause the habitat change from flowing water to still water, interception of the connection between upper and lower streams, and disappearance of spawning grounds. Small-sized hydropower stations on the branches will reduce the water of down streams, then influence the fish populations. Under the background of inter-basin water transfer, potential invasive-species from different river systems should draw attention to the conservation of native fish in the future. Therefore, the present work will provide information for dynamic monitoring on fish diversity and early warning of invasive species during the construction of Hanjiang to Weihe River Water Diversion Project.

Key words: Key words: Freshwater fishes, Dams, Hanjiang to Weihe River Water Diversion Project, Conservation, Yangtze River