Comparing thermal performance curves across traits: how consistent are they?

Thermal performance curves (TPCs) are intended to approximate the relationship between temperature and fitness, and are commonly integrated into species distributional models for understanding climate change responses. However, TPCs may vary across traits because selection and environmental sensitivity (plasticity) differ across traits or because the timing and duration of the temperature exposure, here termed time-scale, may alter trait variation. Yet the extent to which TPCs vary temporally and across traits is rarely considered in assessments of climate change responses. Using a common garden approach, we estimate TPCs for standard metabolic rate (SMR), and activity in Drosophila melanogaster at three test temperatures (16, 25 and 30 ˚C), using flies from each of six developmental temperatures (16, 18, 20, 25, 28 and 30 ˚C). We examined the effects of time-scale of temperature exposure (mins/hours vs days/weeks) in altering the TPC shape, position and commonly used descriptors of the...

热性能曲线（Thermal performance curves, TPCs）旨在拟合温度与适合度之间的关系，常被整合进物种分布模型以解析生物对气候变化的响应。然而，不同性状间的热性能曲线可能存在差异：其原因可能在于不同性状所受的选择作用与环境敏感性（表型可塑性）存在差异，或是温度暴露的时机与时长（本文将其定义为时间尺度）会改变性状变异。但在气候变化响应评估研究中，热性能曲线随时间及性状的变异程度极少被纳入考量范畴。本研究采用同质园实验设计，以取自6个发育温度（16、18、20、25、28和30℃）的黑腹果蝇（Drosophila melanogaster）为实验材料，在3个测定温度（16、25和30℃）下，分别估算其标准代谢率（standard metabolic rate, SMR）与活动水平的热性能曲线。我们考察了温度暴露的时间尺度（分钟/小时级与天/周级）对热性能曲线的形状、位置以及常用描述参数的影响……