RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (06): 965-970.doi: 10.11870/cjlyzyyhj201506010

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CHANGES OF FUNCTIONAL DIVERSITY IN FISH COMMUNITY BEFORE AND AFTER A DAM CLOSURE IN THE GUANYINYAN HYDROPOWER STATION

SU Guo-huan1,2, SHA Yong-cui1,2, XIONG Ying3, ZHANG Pei-yu1,2, XU Jun1   

  1. 1. Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;
    2. University of Chinese Academy of Sciences, Beijing 108000, China;
    3. College of Fisheries, HuaZhong Agricultural University, Wuhan 430070, China
  • Received:2014-05-26 Revised:2014-09-18 Online:2015-06-20
  • Contact: 徐军 E-mail:xujun@ihb.ac.cn

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Abstract: Human activities have strong impacts on ecosystem functioning through their effect on abiotic factors and on biodiversity. Classically, biodiversity changes have been assessed using diversity indices that take into account the number of species present (species richness) and the evenness of abundance distribution among species. However, such indices based only on taxonomic identity provide an incomplete view of biodiversity. Indeed, they do not take into account the biological identity and differences among species. While a lot of theoretical and experimental studies have shown that species functional traits play an important role in connecting changes in community composition and shifts in ecosystem processes. Based on this, we used two different methods, the traditional biodiversity assessment and functional diversity index, to analyze the change of ecosystem function before and after the dam closure of the Guanyinyan Hydropower Station. The purpose of this study is twofold: one is evaluation of the effects of the Ganyinyan Hydropower Station construction in the Jinsha River on the ecological system function, providing certain reference basis for the construction of water conservancy projects in the future, also laying a certain foundation for the author's next phase study. The second is through comparison and analysis to find a more effective and reliable method of assessing ecosystem function. Due to differences in functional traits of species, after habitat change, species that can adapt to new the environments will dominate in community, while species that can't adapt to the new environment will reduce the number or even disappear, leading to the community structure change, and thus make the entire ecosystem process shift. In this paper, by monitoring the fish community composition before and after the Guanyinyan dam construction, combined with the difference of fish functional traits, analyzed the changes of fish community structure and functional diversity before and after the closure of the dam, then make an evaluation of the impact caused by dam construction. Our results show that dam closure has caused some damages on the existence and behavior of the species with larger size, hypostomatous and narrow recipes width; resulted in a decrease in the number of or even disappear of the fish and reduced the functional diversity of fish communities downstream, and then a certain effect on the entire ecosystem function of this area.

Key words: functional diversity, traits, richness, evenness, divergence, ecosystem

CLC Number: 

  • X826
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