Navigation disturbance and its impact on fish assemblage in the East Tiaoxi River, China
Navigation disturbance and its impact on fish assemblage in the East Tiaoxi River, China
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DOI：
10.1007/s11355-011-0181-0
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发表时间：
2013-07
影响因子：
2
通讯作者：
Y. Kano;Tatsuro Sato;Liangliang Huang;C. Wood;K. Bessho;Tomotaka Matsumoto;Y. Shimatani;Jun Nakajima
中科院分区：
文献类型：
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作者：
Y. Kano;Tatsuro Sato;Liangliang Huang;C. Wood;K. Bessho;Tomotaka Matsumoto;Y. Shimatani;Jun Nakajima
首次提供了航行对中国居留河鱼影响的证据。这项调查是在上海附近流入太湖的东调溪河进行的，在最近的经济发展时期，该河上的货船流量大幅增加。对这条河上29个站点的水浊度、船舶交通等环境因素进行了评估。在逐步回归模型中，浊度与船舶交通量显著相关(R2=0.53)。另一项调查在同一河流地区的46个地点进行，其中评估了环境因素，并对鱼类个体进行了电捕鱼。基于环境因子，应用广义线性模型和逐步回归方法对鱼类种群生态指标(物种丰富度、个体密度和Shannon‘s多样性指数)进行预测。结果表明，这些指标与浑浊度和人工岸堤结构的存在呈负相关。另一项分析进一步表明，浑浊的水对体型较小的鱼的负面影响尤其显著。总之，货船交通对东跳溪河的鱼类聚集，特别是对较小的个体产生了负面影响。对于这条和其他类似的东亚水道，应更加重视保护行动和考虑这类交通对环境的影响。
We provide the first evidence for navigation impact on resident river fish in China. The survey was conducted in the East Tiaoxi River that discharges into Lake Taihu near Shanghai, on which cargo ship traffic has dramatically increased in the recent economic development period. Water turbidity, ship traffic and other environmental factors were evaluated at 29 sites on the river. In a multiple regression model with the stepwise method, turbidity was significantly correlated with ship traffic (R2= 0.53). Another survey was conducted at 46 sites in the same area of the river, in which environmental factors were evaluated and fish individuals were electrofished. A generalised linear model with the stepwise method was applied to predict ecological indicators of the fish assemblage (species richness, individual density and Shannon’s diversity index) based on environmental factors. The results showed that the indicators were negatively correlated with turbidity and presence of artificial shore embankment structures. Another analysis further showed that the negative effect of turbid water was especially considerable for fish of smaller size. In conclusion, cargo ship traffic has a negative impact on fish assemblage, especially on smaller individuals, in the East Tiaoxi River. A higher profile for conservation actions and consideration of environmental impacts of such traffic should be given increasing focus for this and other similar East Asian water courses.