Spatial structure and bottom characteristics of the only remaining spawning area of Chinese sturgeon in the Yangtze River
Identifieur interne : 000631 ( Main/Exploration ); précédent : 000630; suivant : 000632Spatial structure and bottom characteristics of the only remaining spawning area of Chinese sturgeon in the Yangtze River
Auteurs : H. Zhang [République populaire de Chine] ; Q. W. Wei [République populaire de Chine] ; B. E. Kyanrd [États-Unis] ; H. Du [République populaire de Chine] ; D. G. Yang [République populaire de Chine] ; X. H. Chen [République populaire de Chine]Source :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 2011-04.
Abstract
This study was performed to determine the spatial structure and bottom characteristics of the only remaining spawning area of Chinese sturgeon (Acipenser sinensis) located just downstream of the Gezhouba Dam. During the period 1996–2003, three methods were employed, including (i) the examination of the stomachs of opportunistic predatory fishes that feed on sturgeon eggs, (ii) tracking the mature sturgeons by ultrasonic tags and (iii) capturing eggs and yolk‐sac larvae (ELS) at and near the river bottom by D‐shaped bottom drift nets to monitor the spawning activities of A. sinensis. It was found that A. sinensis selected permanent locations to mate. There were two mating locations: an upstream mating area (UMA), in the tailrace of the Dajiang Hydroelectric Station and about 870 m far from the Gezhouba Dam (area, 0.1 km2), and a downstream mating area (DMA), about 2500 m from Gezhouba Dam (area, 0.3 km2). The DMA was the chief mating area and was used every year. The incubation area (for dispersal of fertilized eggs to incubate) was range from 870 m to 7 km from the dam. Generally, the total length of the spawning area was 5–7 km length (area 2.0–2.7 km2) with the range slightly varied in different spawning activities. A relief map of the riverbed and a bottom hydroacoustic survey of the DMA found a deep depression and rocky substrate. These may be important characteristics of geomorphology for the spawning area of A. sinensis.
Url:
DOI: 10.1111/j.1439-0426.2011.01708.x
Affiliations:
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Zhang</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou, Hubei</wicri:regionArea><wicri:noRegion>Hubei</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi, Jiangsu</wicri:regionArea><wicri:noRegion>Jiangsu</wicri:noRegion></affiliation></author><author><name sortKey="Wei, Q W" sort="Wei, Q W" uniqKey="Wei Q" first="Q. W." last="Wei">Q. W. Wei</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou, Hubei</wicri:regionArea><wicri:noRegion>Hubei</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi, Jiangsu</wicri:regionArea><wicri:noRegion>Jiangsu</wicri:noRegion></affiliation></author><author><name sortKey="Kyanrd, B E" sort="Kyanrd, B E" uniqKey="Kyanrd B" first="B. E." last="Kyanrd">B. E. Kyanrd</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>BK‐Riverfish, LLC, Amherst, MA</wicri:regionArea><placeName><region type="state">Massachusetts</region></placeName></affiliation></author><author><name sortKey="Du, H" sort="Du, H" uniqKey="Du H" first="H." last="Du">H. Du</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou, Hubei</wicri:regionArea><wicri:noRegion>Hubei</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi, Jiangsu</wicri:regionArea><wicri:noRegion>Jiangsu</wicri:noRegion></affiliation></author><author><name sortKey="Yang, D G" sort="Yang, D G" uniqKey="Yang D" first="D. G." last="Yang">D. G. Yang</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fisheries Science, Jingzhou, Hubei</wicri:regionArea><wicri:noRegion>Hubei</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Freshwater Fisheries Research Center, Chinese Academy of Fisheries Science, Wuxi, Jiangsu</wicri:regionArea><wicri:noRegion>Jiangsu</wicri:noRegion></affiliation></author><author><name sortKey="Chen, X H" sort="Chen, X H" uniqKey="Chen X" first="X. H." last="Chen">X. H. 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During the period 1996–2003, three methods were employed, including (i) the examination of the stomachs of opportunistic predatory fishes that feed on sturgeon eggs, (ii) tracking the mature sturgeons by ultrasonic tags and (iii) capturing eggs and yolk‐sac larvae (ELS) at and near the river bottom by D‐shaped bottom drift nets to monitor the spawning activities of A. sinensis. It was found that A. sinensis selected permanent locations to mate. There were two mating locations: an upstream mating area (UMA), in the tailrace of the Dajiang Hydroelectric Station and about 870 m far from the Gezhouba Dam (area, 0.1 km2), and a downstream mating area (DMA), about 2500 m from Gezhouba Dam (area, 0.3 km2). The DMA was the chief mating area and was used every year. The incubation area (for dispersal of fertilized eggs to incubate) was range from 870 m to 7 km from the dam. Generally, the total length of the spawning area was 5–7 km length (area 2.0–2.7 km2) with the range slightly varied in different spawning activities. A relief map of the riverbed and a bottom hydroacoustic survey of the DMA found a deep depression and rocky substrate. These may be important characteristics of geomorphology for the spawning area of A. sinensis.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li><li>États-Unis</li></country><region><li>Massachusetts</li></region></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Zhang, H" sort="Zhang, H" uniqKey="Zhang H" first="H." last="Zhang">H. Zhang</name></noRegion><name sortKey="Chen, X H" sort="Chen, X H" uniqKey="Chen X" first="X. H." last="Chen">X. H. Chen</name><name sortKey="Chen, X H" sort="Chen, X H" uniqKey="Chen X" first="X. H." last="Chen">X. H. Chen</name><name sortKey="Du, H" sort="Du, H" uniqKey="Du H" first="H." last="Du">H. Du</name><name sortKey="Du, H" sort="Du, H" uniqKey="Du H" first="H." last="Du">H. Du</name><name sortKey="Wei, Q W" sort="Wei, Q W" uniqKey="Wei Q" first="Q. W." last="Wei">Q. W. Wei</name><name sortKey="Wei, Q W" sort="Wei, Q W" uniqKey="Wei Q" first="Q. W." last="Wei">Q. W. Wei</name><name sortKey="Yang, D G" sort="Yang, D G" uniqKey="Yang D" first="D. G." last="Yang">D. G. Yang</name><name sortKey="Yang, D G" sort="Yang, D G" uniqKey="Yang D" first="D. G." last="Yang">D. G. Yang</name><name sortKey="Zhang, H" sort="Zhang, H" uniqKey="Zhang H" first="H." last="Zhang">H. Zhang</name></country><country name="États-Unis"><region name="Massachusetts"><name sortKey="Kyanrd, B E" sort="Kyanrd, B E" uniqKey="Kyanrd B" first="B. E." last="Kyanrd">B. E. Kyanrd</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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