Gradual plasticity alters population dynamics in variable environments: thermal acclimation in the green alga Chlamydomonas reinhartdii
Gradual plasticity alters population dynamics in variable environments: thermal acclimation in the green alga Chlamydomonas reinhartdii
复制标题
DOI：
10.1098/rspb.2017.1942
复制
发表时间：
2018-01-10
影响因子：
4.7
通讯作者：
Vasseur, David A.
中科院分区：
文献类型：
--
作者：
Kremer, Colin T.;Fey, Samuel B.;Vasseur, David A.
环境的变异性是普遍存在的，但其对人口的影响并不完全了解或预测。最近的注意力集中在快速进化如何通过适应性性状变化影响生态动态。然而，由可塑性反应引起的性状变化的影响受到的关注较少，并且通常被认为可以优化性能并在一个单独的，比生态动态更快的时间尺度上展开。基于这些假设，我们提出，逐渐可塑性是重要的生态动力学，并提出了一个研究的淡水绿色藻类莱茵衣藻的塑性反应，因为它适应温度的变化。首先，我们证明了C.莱茵衣藻的逐渐驯化反应可以在扰动后增强和抑制其性能，这取决于其先前的热历史。其次，我们证明了传统的方法无法预测的人口动态C。reinhardtii暴露于温度波动，一个新的模式，逐步驯化成功。最后，使用高分辨率的数据，我们表明，湖泊生态系统中的浮游植物可以经历足够的热变化，使驯化相关。这些结果挑战了关于可塑性与生态动力学相互作用的流行假设。在当前对快速进化的强调中，我们还必须开发出解释可塑性的预测方法。
Environmental variability is ubiquitous, but its effects on populations are not fully understood or predictable. Recent attention has focused on how rapid evolution can impact ecological dynamics via adaptive trait change. However, the impact of trait change arising from plastic responses has received less attention, and is often assumed to optimize performance and unfold on a separate, faster timescale than ecological dynamics. Challenging these assumptions, we propose that gradual plasticity is important for ecological dynamics, and present a study of the plastic responses of the freshwater green algae Chlamydomonas reinhardtii as it acclimates to temperature changes. First, we show that C. reinhardtii's gradual acclimation responses can both enhance and suppress its performance after a perturbation, depending on its prior thermal history. Second, we demonstrate that where conventional approaches fail to predict the population dynamics of C. reinhardtii exposed to temperature fluctuations, a new model of gradual acclimation succeeds. Finally, using high-resolution data, we show that phytoplankton in lake ecosystems can experience thermal variation sufficient to make acclimation relevant. These results challenge prevailing assumptions about plasticity's interactions with ecological dynamics. Amidst the current emphasis on rapid evolution, it is critical that we also develop predictive methods accounting for plasticity.