Impact of Changing Water Levels and Weather on Oncomelania hupensis hupensis Populations, the Snail Host of Schistosoma japonicum, Downstream of the Three Gorges Dam
- 6 May 2008
- journal article
- Published by Springer Science and Business Media LLC in Ecohealth
- Vol. 5 (2), 149-158
- https://doi.org/10.1007/s10393-008-0169-x
Abstract
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°, 9.1°, and 5.8°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.Keywords
This publication has 18 references indexed in Scilit:
- Homogenization of regional river dynamics by dams and global biodiversity implicationsProceedings of the National Academy of Sciences of the United States of America, 2007
- Effect of temperature on the development of Schistosoma japonicum within Oncomelania hupensis, and hibernation of O. hupensisZeitschrift für Parasitenkunde, 2006
- Freshwater biodiversity: importance, threats, status and conservation challengesBiological Reviews, 2006
- SCHISTOSOMIASIS JAPONICA INTERVENTION STUDY ON POYANG LAKE, CHINA: THE SNAIL'S TALEMalacologia, 2006
- The public health significance and control of schistosomiasis in China—then and nowActa Tropica, 2005
- Fragmentation and Flow Regulation of the World's Large River SystemsScience, 2005
- The prevalence and control of schistosomiasis in Poyang Lake region, ChinaParasitology International, 2004
- Landscape Changes and Increasing Flood Frequency in China's Poyang Lake RegionThe Professional Geographer, 2003
- Schistosomiasis in the People's Republic of China: Prospects and Challenges for the 21st CenturyClinical Microbiology Reviews, 2001
- Using SAS PROC MIXED to Fit Multilevel Models, Hierarchical Models, and Individual Growth ModelsJournal of Educational and Behavioral Statistics, 1998