关键词: 钉螺, 再生, 研究

Abstract:

Objective To explore the reproductive capacity of Oncomelania snails in the environment in Qingpu district. Methods Soils that were taken by environmental Methods from 10 sampling sites in all the ten towns of Qingpu district served as the test group, with soil samples taken in the same way from Songjiang district and Jinshan district where O. snails appeared in recent years used as the control group. All these samples were randomized as the experimental fields. O.snails marked by different colors were divided into 12 groups, 25 males and 25 females for each group. The O. snails were also randomized to the fields to see whether the second birth of snails would appear and their survival status over the winter. Results It was on May 22nd, 2008 that the O. snails were stocked and the second generation was first found 147 days later, with the second generation of O. snails appearing in every field of the experimental base before May 17th, 2009. The average monthly temperature for snails to reproduce or incubate was between 27.1 ℃ to 34.3 ℃, with the value being between 3.2 ℃ to 9.8 ℃ for the nails to do the same things in Spring. Statistical analysis by the paired t-test showed that there was no significant difference (t＝0.17, P＝0.87) in the average pH values of the soils before and after the experiment, which were 5.5±0.7 versus 5.4±1.0. Conclusion O. snails are able reproduce in Qingpu district with the ability to survive over winters, relatively low temperature needed in spring for them to reproduce.

Key words: Oncomelania snails, Reproducibility, Research