PDF(Pubmed)
Abstract：
Climate change is currently considered one of the major threats to biodiversity and is associated with an increase in the frequency and intensity of extreme weather events, such as heatwaves. Heatwaves create acutely stressful conditions that may lead to disruption in the performance and survival of ecologically and economically important organisms, such as insect pollinators. In this study, we investigated the impact of simulated heatwaves on the performance of queenless microcolonies of Bombus terrestris audax under laboratory conditions. Our results indicate that heatwaves can have significant impacts on bumblebee performance. However, contrary to our expectations, exposure to heatwaves did not affect survival. Exposure to a mild 5-day heatwave (30-32 °C) resulted in increased offspring production compared to those exposed to an extreme heatwave (34-36 °C) and to the control group (24 °C). We also found that brood-care behaviours were impacted by the magnitude of the heatwave. Wing fanning occurred occasionally at temperatures of 30-32 °C, whereas at 34-36 °C the proportion of workers engaged in this thermoregulatory behaviour increased significantly. Our results provide insights into the effects of heatwaves on bumblebee colony performance and underscore the use of microcolonies as a valuable tool for studying the effects of extreme weather events. Future research, especially field-based studies replicating natural foraging conditions, is crucial to complement laboratory-based studies to comprehend how heatwaves compromise the performance of pollinators. Such studies may potentially help to identify those species more resilient to climate change, as well as those that are most vulnerable.
摘要：
气候变化目前被认为是对生物多样性的主要威胁之一，并与极端天气事件的频率和强度增加有关，比如热浪。热浪造成剧烈的压力条件，可能导致生态和经济上重要的生物的性能和生存中断，如昆虫传粉者。在这项研究中,在实验室条件下，我们研究了模拟热浪对Bombusterrestrisaudax无皇后微菌落性能的影响。我们的结果表明，热浪会对大黄蜂的性能产生重大影响。然而,与我们的期望相反,暴露于热浪并不影响生存。与暴露于极端热浪（34-36°C）和对照组（24°C）的人相比，暴露于温和的5天热浪（30-32°C）会导致后代产量增加。我们还发现，育龄护理行为受到热浪的影响。机翼扇动偶尔发生在30-32°C的温度下，而在34-36°C时，从事这种体温调节行为的工人比例显着增加。我们的结果提供了有关热浪对大黄蜂菌落性能影响的见解，并强调了将微菌落用作研究极端天气事件影响的有价值工具。未来的研究，尤其是野外研究复制自然觅食条件，对于补充基于实验室的研究以了解热浪如何损害传粉者的性能至关重要。这样的研究可能有助于确定那些对气候变化更有弹性的物种，以及那些最脆弱的人。
