关键词: 钉螺；血吸虫病；冷驯化；变温速率

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