Increase in heat tolerance following a period of heat stress in a naturally occurring insect species
Increase in heat tolerance following a period of heat stress in a naturally occurring insect species
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自然发生的昆虫在经历一段热应激期后耐热性增强
DOI：
10.1111/1365-2656.13995
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发表时间：
2023
影响因子：
4.8
通讯作者：
Amarasekare, Priyanga
中科院分区：
文献类型：
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作者：
Ardelan, Andre;Tsai, Anne;Will, Sophia;McGuire, Rosa;Amarasekare, Priyanga
气候变暖是21世纪决定性的环境危机。因此，阐明生物体是否能够适应快速变化的热环境是一个至关重要的研究重点。我们研究了一种以加利福尼亚海岸鼠尾草灌丛的一种特有植物（Isomeris arborea）为食的本地半翅目昆虫（Murgantia histrionica）的变暖效应。2009年进行的实验量化了温度对幼鱼成熟率、阶段特异性和累积存活率的响应。在这中间的十年里，出现了有记录以来最热的几年，平均气温不断上升，极端高温的频率也在增加。2021年重复的实验显示，细菌对温度的反应发生了惊人的变化。2009年，在33°C下，没有卵在第二若虫期后发育。2021年，卵子在33°C下发育成具有生殖能力的成虫。成熟和存活的温度上限随着年龄和温度的增加而增加，死亡风险降低，死亡率的温度敏感性随着年龄的增加而降低。虽然我们不能排除其他环境因素同时发生影响我们研究结果的可能性，但所有观察到的性状变化都朝着更强的耐热性方向发展，这一事实表明，持续暴露在极端热应激下可能至少是这些变化的部分原因。丑角蝽属异翅目，是一种具有重要经济意义的害虫、生物防治剂和疾病载体。与传粉昆虫等有益的全变性昆虫相比，它们在抵御变暖方面的成功程度有所不同，这可能会加剧其他原因（如污染和杀虫剂）导致的有益昆虫的减少，对生物多样性和生态系统功能造成潜在的严重后果。
Climate warming is the defining environmental crisis of the 21st century. Elucidating whether organisms can adapt to rapidly changing thermal environments is therefore a crucial research priority.We investigated warming effects on a native Hemipteran insect (Murgantia histrionica) that feeds on an endemic plant species (Isomeris arborea) of the California coastal sage scrub. Experiments conducted in 2009 quantified the temperature responses of juvenile maturation rates and stage‐specific and cumulative survivorship. The intervening decade has seen some of the hottest years ever recorded, with increasing mean temperatures accompanied by an increase in the frequency of hot extremes.Experiments repeated in 2021 show a striking change in the bugs' temperature responses. In 2009, no eggs developed past the second nymphal stage at 33°C. In 2021, eggs developed into reproductive adults at 33°C. Upper thermal limits for maturation and survivorship have increased, along with a decrease in mortality risk with increasing age and temperature, and a decrease in the temperature sensitivity of mortality with increasing age.While we cannot exclude the possibility that other environmental factors occurring in concert could have affected our findings, the fact that all observed trait changes are in the direction of greater heat tolerance suggests that consistent exposure to extreme heat stress may at least be partially responsible for these changes.Harlequin bugs belong to the suborder Heteroptera, which contains a number of economically important pests, biological control agents and disease carriers. Their differential success in withstanding warming compared to beneficial holometabolous insects such as pollinators may exacerbate the decline of beneficial insects due to other causes (e.g. pollution and pesticides) with potentially serious consequences on both biodiversity and ecosystem functioning.