Dealing with host and food searching in a diurnal parasitoid: consequences of light at night at intra- and trans-generational levels
Dealing with host and food searching in a diurnal parasitoid: consequences of light at night at intra- and trans-generational levels
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DOI：
10.1111/icad.12477
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发表时间：
2021-03-01
影响因子：
3.5
通讯作者：
Desouhant, Emmanuel
中科院分区：
文献类型：
--
作者：
Gomes, Elisa;Rey, Benjamin;Desouhant, Emmanuel
光污染是一种普遍的现象，对从个体到群体的夜间生物产生重大影响。然而，它对昼行性生物的影响仍然很少研究。我们将昼行性寄生蜂（黑星菌）连续两到八个晚上暴露在低（0.7勒克斯）或高（20勒克斯）的人造光下，并与对照组（0勒克斯）相比，量化了其对它们生理和日间行为的影响。接下来，我们考虑了暴露于光污染的母亲对后代的潜在跨代影响。虽然在黑暗的夜晚，黄蜂没有表现出活动，但暴露于人造光引发了夜间活动，并改变了与觅食相关的日间行为。与对照组相比，夜间暴露在光线下的黄蜂更倾向于选择宿主而不是食物。当晚上暴露在0.7勒克斯的光线下时，它们也会花更多的时间进食。然而，这些行为的变化与个体能量储备的变化无关。光污染的影响在跨代水平上持续存在：当母亲在夜间暴露于0.7勒克斯的光时，后代的发育时间和喂养前的潜伏期增加。即使在低强度下，光污染也会改变昼行性昆虫的觅食行为。光污染对昆虫种群有长期的影响，光污染引起的行为改变可能在短期内对V.canescens有益。然而，需要进行更长期的研究（例如终生繁殖成功率），以充分了解其对昆虫的影响。
Light pollution is a widespread phenomenon with major consequences on nocturnal organisms from individual to community. However, its effects on diurnal organisms are still scarcely studied.We exposed diurnal parasitoid wasps (Venturia canescens) to low (0.7 lux) or high (20 lux) artificial light for two to eight consecutive nights, and quantified its consequences on their physiology and daytime behaviour compared to a control group (0 lux). We next considered potential trans-generational effects on offspring whose mothers were exposed to light pollution.While in the dark night the wasps showed no activity, exposure to artificial light triggered nocturnal activity and altered diurnal behaviours related to foraging. Wasps exposed to light at night had a greater propensity to choose hosts rather than food compared to controls. They also spent more time feeding when exposed to 0.7 lux of light at night. However, these behavioural modifications were not related to changes in individual energy reserves.Light pollution effects persisted at trans-generational level: offspring development time and latency before feeding increased when mothers were exposed to 0.7 lux light at night.Even at low intensity, light pollution alters foraging behaviour of a diurnal insect. Searching for hosts or food being essential for fitness, light pollution is likely to have long-term repercussions on insect populations.Light pollution caused behavioural modifications potentially beneficial for V. canescens in the short term. However, longer term studies (e.g. on lifetime reproductive success) are needed to fully understand its consequences on insects.