中国地理科学 ›› 2019, Vol. 20 ›› Issue (1): 26-36.doi: 10.1007/s11769-018-0995-x

• 论文 • 上一篇    下一篇

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

DING Chengzhi1, JIANG Xiaoming2, WANG Lieen3, FAN Hui1, CHEN Liqiang1, HU Jinming1, WANG Hailong3, CHEN Yifeng4, SHI Xiaotao5, CHEN Hao3, PAN Bohui3, DING Liuyong1, ZHANG Chao1, HE Daming1   

  1. 1. Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Yunnan University, Kunming 650091, China;
    2. State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China;
    3. Huaneng Lancang River Hydropower Co., Ltd, Kunming 650214, China;
    4. Laboratory of Biological Invasion and Adaptive Evolution, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 410072, China;
    5. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China
  • 收稿日期:2018-01-15 修回日期:2018-03-26 出版日期:2019-02-27 发布日期:2019-01-05
  • 通讯作者: HE Daming.E-mail:dmhe@ynu.edu.cn E-mail:dmhe@ynu.edu.cn
  • 基金资助:

    Under the auspices of 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)

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

DING Chengzhi1, JIANG Xiaoming2, WANG Lieen3, FAN Hui1, CHEN Liqiang1, HU Jinming1, WANG Hailong3, CHEN Yifeng4, SHI Xiaotao5, CHEN Hao3, PAN Bohui3, DING Liuyong1, ZHANG Chao1, HE Daming1   

  1. 1. Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Yunnan University, Kunming 650091, China;
    2. State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China;
    3. Huaneng Lancang River Hydropower Co., Ltd, Kunming 650214, China;
    4. Laboratory of Biological Invasion and Adaptive Evolution, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 410072, China;
    5. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China
  • Received:2018-01-15 Revised:2018-03-26 Online:2019-02-27 Published:2019-01-05
  • Contact: HE Daming.E-mail:dmhe@ynu.edu.cn E-mail:dmhe@ynu.edu.cn
  • Supported by:

    Under the auspices of 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)

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.

关键词: fish diversity, dam demolition, habitat recovery, Cypriniformes, international rivers

Abstract:

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.

Key words: fish diversity, dam demolition, habitat recovery, Cypriniformes, international rivers