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11 May 2006, Volume 18 Issue 4

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Study on morphologic quantitative characteristics of Oncomelania  hupensis Ⅲ. Morphologic variations and their spatial correlation among snail populations

ZHOU Yi-Biao, ZHAO Gen-Ming, PENG Wen-Xiang, WEI Jian-Guo, JIANG Qing-Wu

2006, 18(4):  241. 

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Objective To explore morphologic variations and their spatial correlation among On comelania hupensis populations from the mainland of China. Methods Twenty-seven snail popula tions from ten provinces were collected, The morphologic indices of shells and geographic distances between the snail spots were measured respectively, and the morphologic variations among snail populations and the correlations between morphologic variations and geographical distances were an alyzed. Results The median of Euclidean distances was 3. 24 (95% CI,2.88-3. 8l) among 20 snail populations of O. h. hupensis including a snail population from Guangxi Province, and was 3, 15 (95% CI: 2. 86- 3. 76) excluding the Guangxi snail population; the median was l. 69 (95% CI: 1. 33 - 2. 27) among 6 populations of O. h. robertsoni. Whether including a snail population from Guangxi Province or not, the median among O. h. robertsoni was le.ss than that among O. h. hupensrs (PO. 05). The correiation coefficient was 0. 265 5 for O. h.hupensis including a snail population from (Juangxi Province, 0. 256 7 not including it; and was 0. 312 1 for ribbcd-shell population. Conclusions Morphologic variation among O, h. hupensis is bigger than that among O. h. robertsoni, and morphologic variation among ribbed-shell populations is bigger than that among smooth-shell popuLations, There is significant spatial structure among ribbed-shell snail populations of Oncomelania hupensis distributed in the mainland of China.

Observation on Oncomelania hupen,sis spread in Jiangdu pumping station in the east route of SouthNorth Water Diversion Project

HUANG Yi-Xin, GAO Yang, HONG Qing-Biao, SUN Le-Bing, YANG Kun, LI Wei, ZHANG Jian-Feng, ZHU Xia-Zhang, ZHU Xi-An, LIANG You-Sheng

2006, 18(4):  247. 

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Objective To understand the probability of Oncomelania hupensis spread in the wa ter-transporting channel in the east route of South-North Water Diversion Project. Methods The investigation of snail distribution was carried out in the waterhead riverway, the fence of pumping station, the water-transporting line, and the Gaoshui River. The flotage was refloated to detect the snails. At the same time, the data were collected and analyzed about the pumping station project, water diversion amount and the tide height, Results There were snails in the water-transporting channel in the east route. There were also snails in the flotage. However, there were no snails in the fence of pumping station, the water-transporting line and the Gaoshui River. Conclusions The “oodgate, fence , water pump of pumping station and the water-transporting river have the effect of countercheck and sedimentation to snails. The water level of the water-transporting river is maintained at higher level when the river was running. Therefore t the water-transporting channel in the east route is not suited to snait growth and propagation.