Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, China
The ecological degradation of freshwater river and lake system has developed into a global crisis. From January 2020, a “ten-year fishing ban” has been conducted in the Yangtze River and its affiliated lakes in China, which is an unprecedented and one of the most stringent biodiversity conservation...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Ecological Indicators |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X22009074 |
| _version_ | 1811268085358788608 |
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| author | Ruilong Wang Yi Han Fei Fan Jorge García Molinos Jun Xu Kexiong Wang Ding Wang Zhigang Mei |
| author_facet | Ruilong Wang Yi Han Fei Fan Jorge García Molinos Jun Xu Kexiong Wang Ding Wang Zhigang Mei |
| author_sort | Ruilong Wang |
| collection | DOAJ |
| description | The ecological degradation of freshwater river and lake system has developed into a global crisis. From January 2020, a “ten-year fishing ban” has been conducted in the Yangtze River and its affiliated lakes in China, which is an unprecedented and one of the most stringent biodiversity conservation plans in the World. However, there are still uncertainties about its restorative effect, because the river-lake isolation has not been properly addressed. To provide more references for the management of widespread sluice-controlled lakes, we constructed Ecopath models for three oxbow lakes under different management modes, compared the outputs, and manipulated through Ecosim simulations. The model comparison showed that, the lakes with longer protection, which only connected to the river in flood phase, were more developed but not more complex in ecological structure. Whereas year-round connected lake had also been simplified after the fishing ban: a 10 cm mesh net allowed small fish flowing in but restricted large fish wintering out, thus caused its biomass accumulation. According to the trophodynamic simulations, the maturity and complexity could be improved simultaneously when large individuals of river-lake migratory fish were removed from the system. Our results indicated a possible widespread food web simplification in sluice-controlled lakes of the middle and lower Yangtze floodplain during the “ten-year fishing ban”, and we suggested that future seasonal connecting scheme should be aiming at driving large river-lake migratory species back to the river, including enlarging net mesh and increasing water discharge in autumn and winter. Our findings make new complements to seasonal connecting methods and may benefit the conservation of floodplain lakes worldwide. |
| first_indexed | 2024-04-12T21:15:26Z |
| format | Article |
| id | doaj.art-d169db7c45024c36809efb3f739ac121 |
| institution | Directory Open Access Journal |
| issn | 1470-160X |
| language | English |
| last_indexed | 2024-04-12T21:15:26Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecological Indicators |
| spelling | doaj.art-d169db7c45024c36809efb3f739ac1212022-12-22T03:16:28ZengElsevierEcological Indicators1470-160X2022-10-01143109434Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, ChinaRuilong Wang0Yi Han1Fei Fan2Jorge García Molinos3Jun Xu4Kexiong Wang5Ding Wang6Zhigang Mei7The Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuchang District, Wuhan 430072, PR China; University of Chinese Academy of Sciences, 19 Yuquan Road, Shijingshan District, Beijing 100049, PR ChinaThe Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuchang District, Wuhan 430072, PR ChinaThe Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuchang District, Wuhan 430072, PR ChinaArctic Research Centre, Hokkaido University, Sapporo, JapanThe Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuchang District, Wuhan 430072, PR China; Corresponding authors at: Institute of Hydrobiology, Chinese Academy of Sciences, No. 7 Donghu South Road, Wuchang District, Wuhan 430072, China.The Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuchang District, Wuhan 430072, PR China; National Aquatic Biological Resource Center, Wuhan 430072, PR ChinaThe Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuchang District, Wuhan 430072, PR China; National Aquatic Biological Resource Center, Wuhan 430072, PR ChinaThe Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, 7 South Donghu Road, Wuchang District, Wuhan 430072, PR China; National Aquatic Biological Resource Center, Wuhan 430072, PR China; Corresponding authors at: Institute of Hydrobiology, Chinese Academy of Sciences, No. 7 Donghu South Road, Wuchang District, Wuhan 430072, China.The ecological degradation of freshwater river and lake system has developed into a global crisis. From January 2020, a “ten-year fishing ban” has been conducted in the Yangtze River and its affiliated lakes in China, which is an unprecedented and one of the most stringent biodiversity conservation plans in the World. However, there are still uncertainties about its restorative effect, because the river-lake isolation has not been properly addressed. To provide more references for the management of widespread sluice-controlled lakes, we constructed Ecopath models for three oxbow lakes under different management modes, compared the outputs, and manipulated through Ecosim simulations. The model comparison showed that, the lakes with longer protection, which only connected to the river in flood phase, were more developed but not more complex in ecological structure. Whereas year-round connected lake had also been simplified after the fishing ban: a 10 cm mesh net allowed small fish flowing in but restricted large fish wintering out, thus caused its biomass accumulation. According to the trophodynamic simulations, the maturity and complexity could be improved simultaneously when large individuals of river-lake migratory fish were removed from the system. Our results indicated a possible widespread food web simplification in sluice-controlled lakes of the middle and lower Yangtze floodplain during the “ten-year fishing ban”, and we suggested that future seasonal connecting scheme should be aiming at driving large river-lake migratory species back to the river, including enlarging net mesh and increasing water discharge in autumn and winter. Our findings make new complements to seasonal connecting methods and may benefit the conservation of floodplain lakes worldwide.http://www.sciencedirect.com/science/article/pii/S1470160X22009074Biodiversity restorationEcosystem-based managementKempton indexKeystone speciesNetwork analysisRiver-floodplain system |
| spellingShingle | Ruilong Wang Yi Han Fei Fan Jorge García Molinos Jun Xu Kexiong Wang Ding Wang Zhigang Mei Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, China Ecological Indicators Biodiversity restoration Ecosystem-based management Kempton index Keystone species Network analysis River-floodplain system |
| title | Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, China |
| title_full | Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, China |
| title_fullStr | Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, China |
| title_full_unstemmed | Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, China |
| title_short | Need to shift in river-lake connection scheme under the “ten-year fishing ban” in the Yangtze River, China |
| title_sort | need to shift in river lake connection scheme under the ten year fishing ban in the yangtze river china |
| topic | Biodiversity restoration Ecosystem-based management Kempton index Keystone species Network analysis River-floodplain system |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X22009074 |
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