Modeling trophic interactions and impacts of introduced icefish ( Neosalanx taihuensis Chen) in three large reservoirs i
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PRIMARY RESEARCH PAPER
Modeling trophic interactions and impacts of introduced icefish (Neosalanx taihuensis Chen) in three large reservoirs in the Yangtze River basin, China Geng Huang . Qidong Wang . Xue Du . Kai Feng . Shaowen Ye . Jing Yuan . Jiashou Liu . Zhongjie Li . Sena S. De Silva
Received: 19 April 2020 / Revised: 15 July 2020 / Accepted: 10 August 2020 / Published online: 25 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract Non-native fish introductions may damage aquatic ecosystems. To assess the ecological impacts of the introduced icefish (Neosalanx taihuensis Chen), three reservoirs in a cascade, including the Shuibuya Reservoir (SBYR), which is devoid of icefish, and the Geheyan Reservoir (GHYR) and the Gaobazhou Reservoir (GBZR), which have large and small icefish populations, respectively, were selected for this study. Three mass-balance trophic models were established using the Ecopath approach. The results indicated that Handling editor: Pauliina Louhi G. Huang Q. Wang (&) K. Feng S. Ye J. Yuan J. Liu Z. Li State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuhan 430072, Hubei, People’s Republic of China e-mail: [email protected]
(1) the three ecosystems tended to depend more on the grazing food chain, possibly because the dominant fish species in three reservoirs were mainly filter feeders or planktivores; (2) the large icefish population in the GHYR decreased the overall energy transfer efficiency; (3) the ecosystem indices suggested that the GHYR ecosystem appeared to be a moderately mature system with a simple and vulnerable food web structure, and the lack of complexity was largely attributed to the large population of introduced icefish; and (4) the ‘‘mixed trophic impacts (MTI)’’ and niche overlap analysis indicated that the ecological impacts of icefish mainly X. Du Heilongjiang River Fishery Research Institute, Chinese Academy of Fishery Sciences, Harbin 150010, People’s Republic of China S. S. De Silva School of Life & Environmental Sciences, Deakin University, Warrnambool, VIC 3280, Australia
G. Huang Key Laboratory of Ecological Impacts of Hydraulic Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resources & Chinese Academy of Sciences, Wuhan 430079, People’s Republic of China Q. Wang S. Ye J. Yuan J. Liu Z. Li National Research Centre for Freshwater Fisheries Engineering, 7 South Donghu Road, Wuhan 430072, Hubei, People’s Republic of China
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came from predation and interspecific competition. This study demonstrates the consequence of icefish introduction to aquatic ecosystems and suggests that appropriate control of exotic fish is worth considering. Keywords Non-native fish Introduction Aquatic ecosystem Cascading reservoirs Ecopath Massbalance model
Introduction China has become the leading producer in global aquaculture i
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