Effect of short-term high temperature on survival and fecundity of Agasicles hygrophila
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Key Words：Agasicles hygrophila， high temperature, survival, reproduce
Abstract：The effects of short\|term high temperature on adult survival (40-47℃) and fecundity (40-44℃) of Agasicles hygrophila Selma &Vogt were investigated. The results showed that the survival rate of adults after treated 1 h decreased with increasing temperature. The female survival rate was significantly higher than that of males at 44℃ for 1 h. The survival rate of both females and males decreased with increasing treatment time at 40℃. After treated 7 h at 40℃, the female survival rate was significantly lower than that of males. The 90% lethal temperature and time of females were 1.31℃ and 1.29 h higher than those of males, respectively, which indicated that the heat tolerance of females was higher than males, however significantly only when the stress strength was higher. Treatment of 40, 42, and 44℃ for 1 h had no significant effect on longevity and fecundity of newly emerged females, but led to increasing pre\|oviposition duration and ceasing the oviposition behavior of 10-day old females, in which the ceasing period was 2.62 d in average at 44℃. The egg hatching rate decreased from 88.67% at 40℃ to 79.84% at 44℃, which was significantly lower than the control.