Evolutionary consequences of multidriver environmental change in an aquatic primary producer
Evolutionary consequences of multidriver environmental change in an aquatic primary producer
复制标题
DOI：
10.1073/pnas.1703375114
复制
发表时间：
2017-09-12
影响因子：
11.1
通讯作者：
Collins, Sinead
中科院分区：
文献类型：
--
作者：
Brennan, Georgina L.;Colegrave, Nick;Collins, Sinead
气候变化正在以复杂的方式改变水生环境，许多特性的同时变化将推动淡水和海洋生态系统基础初级生产者的进化反应。到目前为止，进化研究已经表明环境驱动因素的变化，无论是单独的还是成对的，如何影响初级生产者的生长和其他性状的进化。在这里，我们在 96 个独特的环境中进化出一个初级生产者，其中包含一到八个环境驱动因素的不同组合，以了解对环境变化的进化反应如何取决于驱动因素的身份和数量。即使在多驱动因素环境中，也只有少数主要驱动因素可以解释人口增长率的大部分进化变化。到进化实验结束时，大多数种群都趋于相同的增长率。然而，当这些主要驱动因素在其他驱动因素存在的情况下出现时，人群会更加适应。这是由于在具有更多驱动因素的环境中选择强度增加，其中更有可能包括主导驱动因素。同时，在对单驱动因素和多驱动因素环境变化的最初短期反应期间发生的许多性状变化在大约 450 代进化后恢复。在未来的水生环境中，种群将遇到不同的驱动因素和选择强度组合，这将改变初级生产者的适应潜力。准确衡量主要初级生产者的选择强度将有助于预测水生食物网基础上的种群规模和性状进化。
Climate change is altering aquatic environments in a complex way, and simultaneous shifts in many properties will drive evolutionary responses in primary producers at the base of both freshwater and marine ecosystems. So far, evolutionary studies have shown how changes in environmental drivers, either alone or in pairs, affect the evolution of growth and other traits in primary producers. Here, we evolve a primary producer in 96 unique environments with different combinations of between one and eight environmental drivers to understand how evolutionary responses to environmental change depend on the identity and number of drivers. Even in multidriver environments, only a few dominant drivers explain most of the evolutionary changes in population growth rates. Most populations converge on the same growth rate by the end of the evolution experiment. However, populations adapt more when these dominant drivers occur in the presence of other drivers. This is due to an increase in the intensity of selection in environments with more drivers, which are more likely to include dominant drivers. Concurrently, many of the trait changes that occur during the initial short-term response to both single and multidriver environmental change revert after about 450 generations of evolution. In future aquatic environments, populations will encounter differing combinations of drivers and intensities of selection, which will alter the adaptive potential of primary producers. Accurately gauging the intensity of selection on key primary producers will help in predicting population size and trait evolution at the base of aquatic food webs.