Effects of reservoir impoundment on fish assemblages in the Wujiang River of China

International Conference on Water Resource and Environment 2016

地球科学;生态环境科学

Zhu, D.^1 ; Yang, Z.^1

Key Laboratory of Ecological Impacts of Hydraulic Projects and Restoration of Aquatic Ecosystem, Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resource, Chinese Academic of Sciences, 578 Xiongchu Avenue, Wuhan, China^1

关键词: First year;    Fish abundance;    Fish assemblages;    Fish catch;    Habitat preferences;    Species composition;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/39/1/012022/pdf
DOI  :  10.1088/1755-1315/39/1/012022

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Fishery catches were investigated during the spring and autumn in the period 2006-2010. The fish assemblages' composition and dynamics were analysed and compared under the pressure of the Pengshui Reservoir impoundment. A total of 101 species were sampled in the lower Wujiang River. 78 species and 83 species were found in the upper and the lower reaches, respectively. After impoundment there were five species in the Yanhe branch and nine species in the Pengshui branch. The abundance of species was higher in the Pengshui than in the Yanhe. Fish abundance did not change in the first year of impoundment (2008) in the Lujiao- Gongtan reach, but it dramatically declined by 45.95% in 2009. The fish were subdivided into three groups and two ecotypes according to their time-series appearance in fish catches and their habitat preference. Species composition changed significantly with decreases in numbers of lotic species. Fish assemblages responded more rapidly and dramatically to impoundment in the reservoir section than the section below the Pengshui Dam.