Simulated climate warming scenarios lead to earlier emergence and increased weight loss but have no effect on overwintering survival in solitary bees

IF 2.3 2区 农林科学 Q1 ENTOMOLOGY
Jannik S. Möllmann, Liv Lörchner, Dean Hodapp, Ina Knuf, Hongfei Xu, Thomas J. Colgan
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Abstract

Insect pollination is critical for both wildflower stability and agricultural yields, with solitary bees being a group of pollinators of fundamental importance. However, documented declines in populations, exacerbated by environmental pressures, including climate change, pose significant threats to the provision of ecosystem services. Exposure to elevated temperatures during periods of dormancy, such as overwintering, is predicted to lead to phenological shifts, changes in condition, and impacts on survival. However, we currently lack studies that inform how such aspects are affected in future climate change scenarios. Using simulated temperature regimes informed by predictions of the Intergovernmental Panel on Climate Change, we exposed overwintering mason bees (Osmia species) to three field-relevant temperature profiles based on either present-day overwintering temperatures or future temperatures predicted under two major climate warming scenarios (SSP2-4.5 and SSP5-8.5) and measured how temperature exposure affected emergence timing, weight loss, and survival. We found that exposure to temperatures under intermediate and worst-case climate warming scenarios led to earlier emergence by approximately three and six weeks, respectively, with increasing divergences in timing of emergence between the sexes of Osmia bicornis, which may lead to intraspecific phenological mismatches. While we found no effect of temperature on overwintering survival rates, we observed increased weight loss prior to emergence but found that in contrast to other studies, it only mildly mediated shifts in emergence timing brought about by temperature exposure, suggesting that weight loss is unlikely to play a major role as a trigger of emergence timing in mason bees. Our study contributes to the growing literature highlighting the impact that temperatures under climate change models will have on the timing of key life events for essential pollinators, which may have consequences at the population and community levels.

Abstract Image

模拟的气候变暖情景导致蜜蜂更早出现,体重减轻,但对独居蜜蜂的越冬生存没有影响
昆虫授粉对野花的稳定性和农业产量都至关重要,而独居蜜蜂是一群至关重要的传粉者。然而,有记录的人口下降,加上包括气候变化在内的环境压力加剧,对生态系统服务的提供构成重大威胁。在冬眠期间(如越冬)暴露在高温下,预计会导致物候变化、环境变化和对生存的影响。然而,我们目前缺乏关于这些方面在未来气候变化情景中如何受到影响的研究。利用政府间气候变化专门委员会(ipcc)预测的模拟温度机制,我们将越冬mason蜜蜂(Osmia种)暴露在三个与现场相关的温度曲线中,这些温度曲线基于当前越冬温度或两种主要气候变暖情景(SSP2-4.5和SSP5-8.5)预测的未来温度,并测量温度暴露对出现时间、体重减轻和生存的影响。我们发现,在中等和最坏的气候变暖情景下,暴露在温度下的双角蚁的羽化时间分别提前了大约3周和6周,两性之间羽化时间的差异越来越大,这可能导致种内物候不匹配。虽然我们没有发现温度对越冬存活率的影响,但我们观察到在羽化前体重减轻的增加,但与其他研究相比,它只轻度调节了温度暴露带来的羽化时间的变化,这表明体重减轻不太可能在触发梅森蜂羽化时间方面发挥主要作用。我们的研究为越来越多的文献做出了贡献,这些文献强调了气候变化模型下的温度将对重要传粉媒介的关键生命事件的时间产生影响,这可能对种群和社区水平产生影响。
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来源期刊
Journal of insect physiology
Journal of insect physiology 生物-昆虫学
CiteScore
4.50
自引率
4.50%
发文量
77
审稿时长
57 days
期刊介绍: All aspects of insect physiology are published in this journal which will also accept papers on the physiology of other arthropods, if the referees consider the work to be of general interest. The coverage includes endocrinology (in relation to moulting, reproduction and metabolism), pheromones, neurobiology (cellular, integrative and developmental), physiological pharmacology, nutrition (food selection, digestion and absorption), homeostasis, excretion, reproduction and behaviour. Papers covering functional genomics and molecular approaches to physiological problems will also be included. Communications on structure and applied entomology can be published if the subject matter has an explicit bearing on the physiology of arthropods. Review articles and novel method papers are also welcomed.
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