短时高温暴露对莲草直胸跳甲生殖特性的影响

以莲草直胸跳甲Agasicles hygrophila Selman & Vogt为对象, 测定了在不同高温（37, 39, 41, 43, 45±0.5℃）下暴露1 h后, 莲草直胸跳甲成虫寿命、产卵前期、产卵量及后代存活力等生殖适应性指标的差异。结果表明: （1）莲草直胸跳甲成虫寿命随暴露温度的升高而降低, 25℃恒温条件下, 雌成虫寿命平均为37.4 d, 而45℃高温暴露1 h后, 雌虫寿命仅为20.0 d; （2）莲草直胸跳甲雌虫的产卵前期随暴露温度升高而显著延长, 25℃恒温条件下雌虫产卵前期平均为4.1 d; 39℃高温暴露1 h后产卵前期延长至4.8 d, 45℃高温暴露1 h后延长至7.3 d; （3）短时高温暴露显著降低莲草直胸跳甲的单雌产卵量, 25℃恒温条件下单雌产卵量平均为965.1粒, 39℃暴露1 h后, 其产卵量为638.7粒, 45℃暴露1 h后低于260粒; （4）短时高温暴露对莲草直胸跳甲后代存活能力有显著的影响, 随着温度的升高, F1代卵的孵化率从95.4%降低至89.2%, F1代成虫的羽化率从87.0%下降到71.3%。以上结果表明, 短时高温暴露导致莲草直胸跳甲生殖适应性下降。

Effects of brief high temperature exposure on reproductive characteristics of Agasicles hygrophila(Coleoptera:Chrysomelidae)

In this study, the longevity, reproduction and survival rate of Agasicles hygrophila adults under different high temperatures (37, 39, 41, 43 and 45±0.5℃) for 1 h were studied. The results showed that: (1) Adult longevity of A. hygrophila species was decreased with the temperature increasing. It was 37.4 d on average at 25℃(control). However, it dropped to 20.0 d after exposure at 45℃ for 1 h. (2) Pre-oviposition period of female A. hygrophila prolonged significantly after exposure to high temperatures over 39℃ for 1 h. It was 4.1 d on average at 25℃ ( control). It prolonged to 4. 8 and 7.3 d after exposure to 39 and 45℃ for 1 h, respectively. (3) Number of eggs laid by individual A. hygrophila female decreased significantly with the heat-shock temperature increasing. It was 965.1 eggs on average at 25℃, but decreased to 638.7 eggs at 39℃ and less than 260 eggs at 45℃. (4) Egg viability and offspring emergence rate of A.hygrophila was also impacted significantly by heat-shock. With the temperature increasing, the egg hatching rate dropped from 95.4% to 89.2% , and the adult emergence rate of F_1 generation decreased from 87.0% to 71.3% . These results indicate that brief high temperature exposure has adverse impacts on fecundity of A.hygrophila.