Sasaki Matthew C, Dam Hans G
Department of Marine Sciences University of Connecticut Groton CT USA.
Ecol Evol. 2020 Oct 5;10(21):12200-12210. doi: 10.1002/ece3.6851. eCollection 2020 Nov.
Organisms experience variation in the thermal environment on several different temporal scales, with seasonality being particularly prominent in temperate regions. For organisms with short generation times, seasonal variation is experienced across, rather than within, generations. How this affects the seasonal evolution of thermal tolerance and phenotypic plasticity is understudied, but has direct implications for the thermal ecology of these organisms. Here we document intra-annual patterns of thermal tolerance in two species of copepods (Crustacea) from a highly seasonal estuary, showing strong variation across the annual temperature cycle. Common garden, split-brood experiments indicate that this seasonal variation in thermal tolerance, along with seasonal variation in body size and phenotypic plasticity, is likely affected by genetic polymorphism. Our results show that adaptation to seasonal variation is important to consider when predicting how populations may respond to ongoing climate change.
生物在几个不同的时间尺度上经历热环境的变化，季节性在温带地区尤为突出。对于世代时间短的生物来说，季节性变化是在不同世代之间而非同一世代内经历的。这种变化如何影响耐热性和表型可塑性的季节性进化尚未得到充分研究，但对这些生物的热生态学有直接影响。在这里，我们记录了来自一个季节性很强的河口的两种桡足类（甲壳纲）生物的年度内热耐受性模式，显示出在年度温度周期中存在强烈变化。共同培养、分窝实验表明，这种热耐受性的季节性变化，以及体型和表型可塑性的季节性变化，可能受到遗传多态性的影响。我们的结果表明，在预测种群如何应对当前气候变化时，考虑对季节性变化的适应很重要。
