Habitat suitability index model for Chinese Sturgeon in the Yangtze River
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摘要: 对与水生生物生存栖息相关的河流底质、水深、水温、流速、水质等生态因子进行研究。提出水生生物的栖息地适合度模型,从生物生存栖息地影响角度对河流治理工程进行科学的评价。以长江珍稀动物中华鲟为研究对象,通过对影响中华鲟的各种生态因子的统计研究,分析整理出适宜其生存繁殖的河流水温、水深、底质、流速、含沙量及食卵鱼10个因子的临界指标,得出了这些因素的适合度曲线。发展了适合评价长江中华鲟栖息地的适合度方程,并用12组实测数据对模型进行了修改验证,提出了适合评价长江中华鲟栖息地适合度模型。Abstract: Human activities,including the construction of the Three Gorges Dam,Gezhouba Dam and other river training projects,are changing the river environment and stream habitat in the Yangtze River in China.As a result,the aquatic organisms,especially,the rare species and fishery fishes with economic value are affected.This paper studies the changing characteristics of the river that affect the aquatic community habitat,such as substrate,water depth,water temperature,water velocity,water quality,etc.Chinese Sturgeons,an anadromous species mainly live in the Yangtze River,are endangered by the construction of dams and other hydraulic projects.Habitat suitability indices for the chinese Sturgeon are proposed and calculated.Based on the research on the main eco-factors influencing growth and reproduction of the species,ten aquatic eco-factors are analyzed for the habitat suitability indices,including water temperature,water depth,substrate,water velocity,sediment concentration,and egg-predatory fishes.The stream habitat for the Chinese Sturgeon is assessed with the model,which integrates these eco-factors.The model is validated by its application to 12 groups of data,and a habitat saitabllity index model for Chinese Sturgeon is presented.
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Key words:
- Yangtze River /
- Chinese Sturgeon /
- habitat suitability index model
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