RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (03): 394-401.doi: 10.11870/cjlyzyyhj201703009

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VARIATION CHARACTERRISTICS OF FISH BIODIVERSITY IN SUIJIANG SECTION BEFORE AND AFTER IMPOUNDMENT OF FIRST PHASE OF JINSHA RIVER HYDROPOWER PROJECT

WANG Jun1, SU Wei1, YANG Shao-rong2, JIANG Wei1   

  1. 1. Chinese Sturgeon Research Institute, China Three Gorges Corporation, Yichang 443100, China;
    2. China Three Gorges Projects Development Company Limited, Chengdu 610041, China
  • Received:2016-08-22 Revised:2016-11-29 Online:2017-03-20

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Abstract: In order to understand the ecological effects of drainage basin cascade hydropower development on fish communities biodiversity, fisheries resources survey were carried out in the Suijiang section, lower reaches of Jinsha River, during 2011 before impoundment of first phase of Jinsha hydropower project and 2015 after impoundment of hydropower project. Fish community biodiversity variation characteristics were analyzed. Results showed that there were 60 fish species in the Suijiang reaches according to our fourth investigation on fisheries resources, which belonged to 5 order, 12 family, and there were 12 upper Yangtze River endemic fish species in total species. Before the impoundment of Jinsha River first phase hydropower project, lotic fish species such as Pelteobagrus vachelli, Coreius guichenoti, Pelteobagrus nitidus were the dominant species while preferring to the reservoir environment species, such as Ctenopharyngodon idellus, Aristichthys nobilis, Hypophthalmichthys molitrix, were major species after the impoundment of Jinsha River hydropower project. Compared to the fish species biodiversity before the impoundment, Margalef richness index, Shannon-Weiner diversity index, and Pielou evenness index were sharply decreased, but there were no significant differences (P>0.05). According to the analyses on the fishes ecological groups, limnophilic fish species were increased from 54% to 71%, river-river migratory fish species were decreased, and river-lake migratory fish species had no change after the impoundment of Jinsha River hydropower project. Abundance/biomass comparison curves showed that fish communities were affected sharply after the impoundment. And the total fishing biomass were increased in the whole reservoir after the impoundment because of the increasement of water primary productivities while the dominant species have smaller body type and simplification trend. In order to scientifically protect the fisheries resources in the Jinsha River, establishing fish natural protected area, carrying out ecological operation, and strengthening the study of the early warning on environmental protection in river basin were suggested as the useful measures.

Key words: the first phase of Jinsha River, impoundment, fish communities, biodiversity

CLC Number: 

  • Q958.15
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