Studies of ectotherm responses to heat extremes often rely on assessing absolute critical limits for heat coma or death (CTmax), however, such single parameter metrics ignore the importance of stress exposure duration. Furthermore, population persistence may be affected at temperatures considerably below CTmax through decreased reproductive output. Here we investigate the relationship between tolerance duration and severity of heat stress across three ecologically relevant life‐history traits (productivity, coma and mortality) using the global agricultural pest Drosophila suzukii. For the first time, we show that for sublethal reproductive traits, tolerance duration decreases exponentially with increasing temperature (R2 > 0.97), thereby extending the Thermal Death Time framework recently developed for mortality and coma. Using field micro‐environmental temperatures, we show how thermal stress can lead to considerable reproductive loss at temperatures with limited heat mortality highlighting the importance of including limits to reproductive performance in ecological studies of heat stress vulnerability.

中文翻译：

---

生存和繁殖的热极限取决于应激持续时间：铃木果蝇的案例研究

变温动物对极端高温反应的研究通常依赖于评估热昏迷或死亡的绝对临界极限（CT最大限度），然而，这种单一参数指标忽略了压力暴露持续时间的重要性。此外，在远低于 CT 的温度下，种群的持久性可能会受到影响最大限度通过减少生殖产出。在这里，我们利用全球农业害虫研究了三个生态相关生活史特征（生产力、昏迷和死亡率）的耐受持续时间和热应激严重程度之间的关系铃木果蝇。我们首次表明，对于亚致死生殖性状，耐受持续时间随着温度的升高呈指数下降（右2> 0.97），从而延长了最近针对死亡率和昏迷开发的热死亡时间框架。利用现场微环境温度，我们展示了热应激如何在热死亡率有限的温度下导致相当大的繁殖损失，强调了在热应激脆弱性生态研究中包括对繁殖性能的限制的重要性。