The timing of heatwave and drought impact on reproductive success and offspring fitness in oriental armyworm, Mythimna separata

文献类型： 外文期刊

第一作者： Lv, Weixiang

作者： Lv, Weixiang;Zhang, Huan;Jiang, Chen;Zhang, Lei;Stanley, David

作者机构：

关键词： global warming; abiotic stress; reproduction; two-sex life table; climate change

期刊名称：ENTOMOLOGIA GENERALIS （ 影响因子：4.6； 五年影响因子：4.4 ）

ISSN： 0171-8177

年卷期： 2025 年 45 卷 2 期

页码：

收录情况： SCI

摘要： Heatwaves and droughts are increasing in frequency and magnitude, which diminishes insect reproduction and offspring fitness. However, the underlying response mechanisms are still poorly understood, especially for the timing of heatwaves, and compound effects of drought and heatwave. Here, we investigate whether heat-related reproductive impairments are timing- or drought-dependent by exploring the effect of the timing of heatwaves and droughts within a short time frame on reproductive success and offspring fitness in Mythimna separata, a notorious agricultural pest. We found that heatwave exposure during mating led to greater damage to reproductive success and offspring fitness relative to heatwave exposure before or after mating. Heatwave exposure before mating damaged reproductive success, but not offspring fitness. In contrast, exposure to a heatwave event after mating had no effect on reproductive performances, but negatively influenced offspring fitness. Compared to a heatwave or drought alone, individuals exposed to heatwaves and droughts (32 degrees C for 3 days and 35% RH) suffered a significant reduction in reproductive success and water content, and a significant increase in glycogen and triglyceride content accumulation. We emphasize the point that variations in the timing of a heatwave or the combination (heatwave and drought) can lead to different consequences for insect reproduction, and suggest the accumulation of energy substances may contribute to buffering drought and heatwave stress in insects. Our findings can improve predictions on the ecological consequences of heatwaves and droughts on agricultural pests under climate change.

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