title: [Impact of simulation operation high water level on Oncomelania hupensis natural growth in water diversion rivers of east route of South-to-North water Diversion Project].
abstract: OBJECTIVE
  To verify the impact of operation high water level on Oncomelania hupensis natural growth in the water diversion rivers of the east route of South-to-North Water Diversion Project.
  
  
  METHODS
  The data of the daily mean water level were investigated in the stilling pool of Jiangdu Pumping Station during the water diversion under the emergency anti-drought, and the water level data of the previous year served as the control. The dynamic of natural growth of O. hupensis snails was observed before and after the high water level in the beach wetlands of the stilling pool of Jiangdu Pumping Station. The water level of emergency anti-drought was as simulation operation water level of the east route of South-to-North Water Diversion Project in the stilling pool, and then the effects of operation water level on O. hupensis natural growth in the water diversion rivers of the east route of South-to-North Water Diversion Project were studied.
  
  
  RESULTS
  The altitude of the beach wetlands was 6.4 to 7.2 meters in the stilling pool of Jiangdu Pumping Station. The water diversion was 255 days continuously and the pumped water was 6.235 billion cubic meters in the Jiangdu Pumping Station from November 2010 to July 2011. There were 216, 136 days and 39 days when daily mean water level were more than or equal to 7.2, 7.6 and 8.0 meters during the water diversion, respectively. The snail densities were 0.856 snails/0.1m2 and 0.0153 snails/0.1m2, respectively, before and after the No.3 beach wetlands flooded in the stilling pool of Jiangdu Pumping Station. The densities of living snails decreased by 98.21%, and there was no any progeny of snail. The snails were not detected in other environment of the stilling pool.
  
  
  CONCLUSIONS
  The operation high water level can effectively restrain snail breeding in the water diversion rivers of the east route of South-to-North Water Diversion Project.
authors.affiliation: Jiangsu Institute of Schistosomiasis, Wuxi 214064, China.
authors.forename: De-Rong
authors.initials: DR
authors.lastname: Hang
authors.forename: Hong-Ping
authors.initials: HP
authors.lastname: Tang
authors.forename: Yi-Xin
authors.initials: YX
authors.lastname: Huang
authors.forename: Guang-Song
authors.initials: GS
authors.lastname: She
authors.forename: Jian-Feng
authors.initials: JF
authors.lastname: Zhang
authors.forename: Yong-Jun
authors.initials: YJ
authors.lastname: Huang
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Xi-Guang
authors.initials: XG
authors.lastname: Zhu
authors.forename: Kun
authors.initials: K
authors.lastname: Yang
mesh_terms: D000818:Animals; D002681:China; D055864:Droughts; D045483:Rivers / Q000469:parasitology*; D012621:Seasons; D012908:Snails / Q000254:growth & development*; D053833:Wetlands