Wehrli Micha, Ge Jian, Slotsbo Stine, Holmstrup Martin
Department of Ecoscience, Aarhus University, Aarhus, Denmark.
Department of Environmental Chemistry, Swiss Federal Institute of Aquatic Science and Technology - Eawag, Dübendorf, Switzerland.
Glob Chang Biol. 2025 Jul;31(7):e70374. doi: 10.1111/gcb.70374.
Global climate change is increasing the frequency and intensity of heat waves, posing a significant threat to ectothermic organisms. Concurrently, chemical pollution, including heavy metals and pesticides, remains a pervasive environmental stressor. This study investigates the effects of sub-lethal copper and fluazinam exposure on the thermal tolerance of the soil-dwelling springtail, Folsomia candida. Using a thermal death time (TDT) framework, we assessed how pre-exposure to these toxicants at two acclimation temperatures (20°C and 24°C) influenced survival under heat stress. Our findings indicate that toxicant exposure reduced heat tolerance at moderately high temperatures (32.5°C) but had negligible effects at extreme temperatures (37°C). Acclimation at 24°C mitigated the negative effects of both toxicants, suggesting an enhanced capacity for cellular homeostasis under warm conditions. Additionally, soil type influenced thermal tolerance, highlighting the importance of environmental context in multiple stressor interactions. These findings highlight the need to integrate realistic thermal exposure scenarios in ecotoxicological assessments to improve predictions of organismal vulnerability under climate change.
全球气候变化正在增加热浪的频率和强度，对变温生物构成重大威胁。与此同时，包括重金属和农药在内的化学污染仍然是一种普遍存在的环境压力源。本研究调查了亚致死剂量的铜和氟唑菌酰胺暴露对土壤栖息弹尾虫——白色符氏跳虫热耐受性的影响。我们使用热死亡时间（TDT）框架，评估了在两种驯化温度（20°C和24°C）下预先接触这些有毒物质如何影响热应激下的存活率。我们的研究结果表明，有毒物质暴露在中等高温（32.5°C）下会降低耐热性，但在极端温度（37°C）下影响可忽略不计。在24°C下驯化减轻了两种有毒物质的负面影响，表明在温暖条件下细胞内稳态能力增强。此外，土壤类型影响热耐受性，突出了环境背景在多重压力源相互作用中的重要性。这些研究结果强调了在生态毒理学评估中纳入实际热暴露情景的必要性，以改进对气候变化下生物脆弱性的预测。
