Impact of changing water levels and weather on Oncomelania hupensis hupensis populations, the snail host of Schistosoma japonicum, downstream of the Three Gorges Dam
Impact of changing water levels and weather on Oncomelania hupensis hupensis populations, the snail host of Schistosoma japonicum, downstream of the Three Gorges Dam
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DOI：
10.1007/s10393-008-0169-x
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发表时间：
2008-06-01
期刊：
影响因子：
2.5
通讯作者：
Davis, George M.
中科院分区：
文献类型：
--
作者：
Seto, Edmund Y. W.;Wu, Weiping;Davis, George M.
越来越多的证据表明，大坝会影响河流生态系统和人类疾病。浦阳湖是中国最大的血吸虫病流行环境之一，由于长江三峡大坝的建设，这里将发生变化。我们评估了1998-2002年间，日本血吸虫的钉螺宿主湖北钉螺随水位和天气变化的变化。1998年鄱阳湖大洪水后的5年间，季节性水位逐渐下降，秋季钉螺密度的均值和方差也随之下降。非线性关系表明，最高的泉水密度与18度、9.1度和5.8摄氏度的当前、2个月和3个月前期气温有关，而最高的跌落密度与2个月和3个月前期水位分别为17和18米有关。这表明，大坝下游较低、更稳定的水位可能会导致平均瀑布密度及其变化量的减少。然而，需要更多的数据来确定通常被季节性洪水摧毁的蜗牛种群是否会在大坝创造的更稳定的环境中活得更长。
Increasing evidence indicates that dams impact riverine ecosystems and human diseases. Poyang Lake, one of the largest schistosomiasis endemic environments in China, will change due to the construction of the Yangtze River Three Gorges Dam. We assess changes in Oncomelania hupensis hupensis, the snail host for Schistosoma japonicum, in response to changing water levels and weather from 1998 to 2002. In the 5 years following the major flooding of Poyang Lake in 1998, seasonal water levels have gradually decreased, concomitant with decreases in mean and variance of fall snail densities. Nonlinear relationships suggest that the highest spring density is associated with current, 2-, and 3-month prior temperatures of 18 degrees, 9.1 degrees, and 5.8 degrees C, while the highest fall density is associated with 2- and 3-month prior water levels of 17 and 18 m, respectively. This suggests that lower, more stable water levels downstream of the dam may result in a reduction in mean fall densities and their variance. However, additional data are needed to determine whether snail populations that are typically destroyed by seasonal floods may live longer in more stable environments created by the dam.