Andreassen Anna H, Clements Jeff C, Morgan Rachael, Spatafora Davide, Metz Moa, Åsheim Eirik R, Pélabon Christophe, Jutfelt Fredrik
Department of Biology, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
DTU Aqua: National Institute of Aquatic Resources, Technical University of Denmark, Kongens Lyngby, Denmark.
Nat Clim Chang. 2025;15(6):665-672. doi: 10.1038/s41558-025-02332-y. Epub 2025 May 14.
Evolution of warming tolerance may help species resist the impacts of climate change but can also lead to negative fitness outcomes. Identifying correlated responses to warming tolerance evolution could identify such negative consequences and help uncover the underlying mechanisms. By assessing the correlated responses of life history and physiological traits to seven generations of artificial selection to increase or decrease the acute upper thermal tolerance limit (CT) in zebrafish (), we show that warming-adapted lines have improved cooling tolerance. Furthermore, the absence of difference between selected lines in aerobic metabolic scope, brain heat shock protein levels, fecundity, growth or swimming speed contradicts several hypotheses concerning the mechanisms controlling acute warming tolerance. These results suggest that selection due to acute heating events does not target variation in metabolic rates but can benefit tolerance to cold, making individuals more resilient to extreme temperature events.
对变暖耐受性的进化可能有助于物种抵御气候变化的影响，但也可能导致负面的适应性结果。识别与变暖耐受性进化相关的反应可以确定这些负面后果，并有助于揭示潜在机制。通过评估斑马鱼七代人工选择（以提高或降低急性热耐受性上限（CT））对生活史和生理特征的相关反应，我们发现适应变暖的品系具有更好的耐寒性。此外，在有氧代谢范围、脑热休克蛋白水平、繁殖力、生长或游泳速度方面，选择品系之间没有差异，这与几个关于控制急性变暖耐受性机制的假设相矛盾。这些结果表明，急性加热事件导致的选择并非针对代谢率的变化，而是可以提高耐寒性，使个体对极端温度事件更具恢复力。
