Fish Assemblage Responses to a Low-head Dam Removal in the Lancang River

论文摘要

Dam removal is becoming an effective approach for aquatic biodiversity restoration in damming river in order to balance the aquatic ecosystem conservation with large-scale cascade damming. However, the effects of dam removal on fish communities in Asian mountainous rivers, which are dominated by Cypriniformes fishes, are still not well known. To determine whether dam removal on a mountainous river benefit restoration of fish diversity, we investigated the response of fish assemblage to dam removal using a before-after-control-impact design in two tributaries of the Lancang River（dam removal river: the Jidu River, and control river: the Fengdian River）. Fish surveys were conducted one year prior to dam removal（2012） and three years（2013–2015） following dam removal. We observed rapidly and notably spatio-temporal changes in fish biodiversity metrics and assemblage structure, occurring in the Jidu River within the first year after dam removal. Overall, fish species richness, density and Shannon-Wiener diversity all increased immediately in above-and below-dam sites, and maintained a stable level in subsequent years, compared to unchanged situation in the control river. All sites in the Jidu River experienced shifts in fish composition after dam removal, with the greatest temporal changes occurred in sites below-and above-the former dam, resulting in a temporal homogenization tendency in the dam removed river. These findings suggest that dam removal can benefit the recovery of habitat conditions and fish community in Asian mountainous rivers, but the results should be further evaluated when apply to other dammed rivers since the dam age, fluvial geomorphology and situation of source populations could all affect the responses of fish assemblages.

论文目录

• 1 Introduction
• 2 Materials and Methods
•   2.1 Site descriptions
•   2.2 Fish surveys
•   2.3 Habitat characterization
•   2.4 Statistical analysis
• 3 Results
•   3.1 Habitat
•   3.2 Changes in fish species composition
•   3.3 Changes in fish distributions
•   3.4 Changes in fish species richness, density, bio-mass and diversity
•   3.5 Changes in fish assemblage structure
•   3.6 Changes in feeding guilds
• 4 Discussion
• 5 Conclusions

文章来源

类型: 期刊论文

作者: DING Chengzhi,JIANG Xiaoming,WANG Lieen,FAN Hui,CHEN Liqiang,HU Jinming,WANG Hailong,CHEN Yifeng,SHI Xiaotao,CHEN Hao,PAN Bohui,DING Liuyong,ZHANG Chao,HE Daming

来源: Chinese Geographical Science 2019年01期

年度: 2019

分类: 基础科学,工程科技Ⅰ辑,工程科技Ⅱ辑,农业科技

专业: 环境科学与资源利用,水利水电工程,水产和渔业

单位: Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Yunnan University,State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology,Huaneng Lancang River Hydropower Co., Ltd,Laboratory of Biological Invasion and Adaptive Evolution, Institute of Hydrobiology, Chinese Academy of Sciences,Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University

基金: the National Natural Science Foundation of China(No.41501574),the National Key Research and Development Program of China(No.2016YFA0601601),the Yunnan Applied Basic Research Projects(No.2016FB079),the National Science and Technology Support Program of China(No.2013BAB06B03)

分类号: S931;X171.4;TV698

页码: 26-36

总页数: 11

文件大小: 573K

下载量: 66