Vindenes Yngvild, Broch Catharina, Andersen Tom, Hessen Dag O, Ergon Torbjørn
Centre for Ecological and Evolutionary Synthesis, University of Oslo, Oslo, Norway.
Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, Oslo, Norway.
Proc Biol Sci. 2025 Jul;292(2051):20250430. doi: 10.1098/rspb.2025.0430. Epub 2025 Jul 23.
The current climate warming has raised concerns that increased rates of ageing will lead to reduced fitness and population viability in ectotherms. However, it is currently not known whether temperature effects on the rate of ageing mainly reflect a change in pace of life or changes in the strength of ageing in the life history. Evaluating this question requires that ageing in different temperatures is compared on the same intrinsic pace-standardized time scale. We present results from a laboratory experiment with , recording complete life histories of 240 individuals from four clonal lines at six temperatures (5°C to 30°C). For each clone and temperature, we calculated measures of pace and shape of ageing in survival and reproduction. Fitness (long-term population growth rate) and mean lifetime reproduction were calculated using matrix population models. Our results highlight three main points: (i) lifespan is not a good predictor of temperature effects on ageing; (ii) there is no strong consistent effect of temperature on shape of ageing; and (iii) within temperature, the shape of ageing was positively correlated with fitness. Hence, lower fitness and population viability of ectotherms in warmer environments may be driven by factors other than increased ageing rates.
当前的气候变暖引发了人们的担忧，即衰老速度加快会导致变温动物的适应性和种群生存能力下降。然而，目前尚不清楚温度对衰老速度的影响主要反映的是生活节奏的变化还是生命历程中衰老强度的变化。要评估这个问题，需要在相同的内在节奏标准化时间尺度上比较不同温度下的衰老情况。我们展示了一项实验室实验的结果，记录了来自四个克隆系的240个个体在六个温度（5°C至30°C）下的完整生命历程。对于每个克隆和温度，我们计算了生存和繁殖中衰老的节奏和形状的指标。使用矩阵种群模型计算适应性（长期种群增长率）和平均寿命繁殖率。我们的结果突出了三个要点：（i）寿命不是温度对衰老影响的良好预测指标；（ii）温度对衰老形状没有强烈的一致影响；（iii）在温度范围内，衰老形状与适应性呈正相关。因此，变温动物在温暖环境中较低的适应性和种群生存能力可能是由衰老率增加以外的因素驱动的。
