Adaptation potential of the copepod Eurytemora affinis to a future warmer Baltic Sea

To predict effects of global change on zooplankton populations, it is important to understand how present species adapt to temperature and how they respond to stressors interacting with temperature. Here we ask if the calanoid copepod Eurytemora affinis from the Baltic Sea can adapt to future climate warming. Populations were sampled at sites with different temperatures. Full sibling families were reared in the lab and used in two common garden experiments (1) populations crossed over 3 temperature treatments 12, 17 and 22.5°C and (2) populations crossed over temperature in interaction with salinity and algae of different food quality.
Genetic correlations of the full siblings’ development time were not different from zero between 12°C and the two higher temperatures 17 °C and 22.5°C, but positively correlated between 17 °C and 22.5°C. Hence, a population at 12 °C is unlikely to adapt to warmer temperature, while a population at ≥ 17 °C can adapt to an even higher temperature, i.e. 22....

为预测全球变化对浮游动物种群的影响，阐明现有物种如何适应温度变化，以及它们如何响应与温度交互作用的胁迫因子，具有重要的科学意义。本研究旨在探究源自波罗的海的哲水蚤目（Calanoida）桡足类Eurytemora affinis能否适应未来气候变暖。研究人员在温度梯度各异的采样点采集种群样本，将全同胞家系置于实验室饲养，并开展两项同质园实验（common garden experiment）：其一，种群分别接受12℃、17℃与22.5℃三种温度处理；其二，探究温度与盐度、不同食物品质藻类的交互作用对种群的影响。
全同胞个体发育时长的遗传相关性在12℃与另外两个较高温度（17℃、22.5℃）间与零无显著差异，但在17℃与22.5℃间呈显著正相关。据此推测，处于12℃环境中的种群不太可能适应更高温度，而处于≥17℃环境中的种群则可适应更高温度，例如22……