Abstract:

Objective To research the cold acclimation ability of snails and the effect of different cooling rates on snails. Methods Snails named Oncomelania hupensi.s hupensis were collected from the marshland in Guichi, Anhui Province in November,2005. Groups including long-period and short-period acclimations were set and compared with the non-acclimation group. The mortality with two different cooling rates was compared. Results After a period of 3 weeks long cold adapta tion, snails raised cold hardiness ability. Different cooling rates did not cause statistical significant differences in mortality. When snails kept in different temperature environments were exposed to the same low-temperature, the differences among the mortalities were also not statistically signifi cant. Conclusion The long-period acclimation exists in snails, but the rapid cold-hardening process is not detected in this experiment.

Key words: Oncomelania hupensis, Schistosomiasis, Cold acclimation, Cooling rate

摘要：

目的 实验室内研究钉螺的冷驯化现象，比较不同降温速度对钉螺死亡率的影响。方法 采集安徽贵池湖滩钉螺，比较经长期、快速冷驯化处理的钉螺与未经冷驯化处理的钉螺死亡率差异。比较不同的降温速度下钉螺死亡率差异。结果 经3周的冷适应后，钉螺的耐寒能力提高。不同降温速率组钉螺死亡率差异无显著性。从不同温度下直接暴露于同一低温的钉螺死亡率差异无显著性。结论 钉螺存在长时间冷驯化现象，但未发现钉螺的快速冷驯化现象。

关键词: 钉螺；血吸虫病；冷驯化；变温速率