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Potential effects of dam cascade on fish: lessons from the Yangtze River
Cheng, Fei1; Li, Wei2; Castello, Leandro3; Murphy, Brian R.3; Xie, Songguang1,4
AbstractConstruction of hydroelectric dams affect river ecosystems, fish diversity, and fisheries yields. However, there are no studies assessing the combined effects on fish caused by several adjacent dams and their reservoirs, as in a 'dam cascade'. This study predicts the potential effects that a cascade of ten dams currently under construction in the upper Yangtze River in China will have on local fishes, and uses such predictions to assess the effectiveness of possible fish conservation measures. We found that the dam cascade will have serious combined effects on fishes mainly due to impoundment, habitat fragmentation and blocking, flow regime modification, and hypolimnetic discharges. The impoundments will cause loss of critical habitats for 46 endemic species. The dams will fragment the populations of 134 species and will block migration routes for 35 potamodromous fishes. Corieus guichenoti will have a high risk of extinction due to the combined effects of impoundment and blocking. Modification of the flow regime will adversely affect the recruitment of 26 species that produce drifting eggs. The start of annual spawning for 13 fishes will be postponed by more than 1 month, and fish spawning and growth opportunities will be reduced due to low water temperatures associated with hypolimnetic discharges. Combined dam effects will further reduce the likelihood of successful recruitment of some endangered species, such as Acipenser dabryanus and Psephurus gladius. Three countermeasures hold promise to mitigate the near-term effects of the dam cascade, including preservation and rehabilitation of critical habitat, restoration of a semi-natural flow regime, and stock enhancement that respects genetic integrity. These conclusions can guide the development of protection plans for fishes in the upper Yangtze River. The approach undertaken in this study-by which the known and likely effects of present and future dams were simultaneously considered in light of the biology of the species-highlights the usefulness of ichthyology for fish conservation.
KeywordCombined Effects China Conservation Flow Regime Extinction Biodiversity
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
WOS Research AreaFisheries ; Marine & Freshwater Biology
WOS SubjectFisheries ; Marine & Freshwater Biology
WOS IDWOS:000359162600009
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Aquat Biodivers & Conservat, Wuhan 430072, Hubei, Peoples R China
2.Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430072, Hubei, Peoples R China
3.Virginia Polytech Inst & State Univ, Dept Fish & Wildlife Conservat, Blacksburg, VA 24061 USA
4.Chinese Acad Sci, Inst Hydrobiol, Huaian Res Ctr, Key Lab Sustainable Fisheries & Environm Protect, Huaian 223002, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Cheng, Fei,Li, Wei,Castello, Leandro,et al. Potential effects of dam cascade on fish: lessons from the Yangtze River[J]. REVIEWS IN FISH BIOLOGY AND FISHERIES,2015,25(3):569-585.
APA Cheng, Fei,Li, Wei,Castello, Leandro,Murphy, Brian R.,&Xie, Songguang.(2015).Potential effects of dam cascade on fish: lessons from the Yangtze River.REVIEWS IN FISH BIOLOGY AND FISHERIES,25(3),569-585.
MLA Cheng, Fei,et al."Potential effects of dam cascade on fish: lessons from the Yangtze River".REVIEWS IN FISH BIOLOGY AND FISHERIES 25.3(2015):569-585.
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