短时高温对莲草直胸跳甲成虫存活及繁殖的影响

采用短时高温处理研究了40～47℃高温对莲草直胸跳甲Agasicles hygrophila Selma & Vogt成虫存活以及40～44℃对雌成虫繁殖的影响。结果表明:(1)处理1h后,随着温度的上升,莲草直胸跳甲雌雄成虫的存活率均随着温度的上升而下降,44℃时,雌成虫的存活率开始显著高于雄成虫;处理温度为40℃时,雌雄成虫存活率也随着处理时间的延长而下降,7h时,雌成虫的存活率开始显著高于雄成虫。此外,雌成虫致死90%的温度和时间分别高于雄成虫1.31℃和1.29h,均表明雌成虫的耐热能力比雄成虫强,但差异仅在胁迫强度偏大时表现为显著;(2)40～44℃短时高温影响莲草直胸跳甲成虫的繁殖。与对照处理相比,40、42和44℃高温处理1h后,雌成虫的寿命和产卵量变化不显著,但均引起了其产卵前期的延长和10日龄成虫产卵停滞,44℃时,平均停滞时间达2.62d,子代卵的孵化率则从40℃的88.67%下降到44℃的79.84%,44℃时显著低于对照。

Effect of short-term high temperature on survival and fecundity of Agasicles hygrophila

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.