Department of Ocean, Earth & Atmospheric Sciences, Old Dominion University, Norfolk, VA, 23429, USA.
Environmental Molecular Sciences Division, Pacific Northwest National Laboratory, 3335 Innovation Boulevard, Richland, WA, 99352, USA.
Sci Rep. 2020 Mar 13;10(1):4693. doi: 10.1038/s41598-020-61684-x.
As CO levels in Earth's atmosphere and oceans steadily rise, varying organismal responses may produce ecological losers and winners. Increased ocean CO can enhance seagrass productivity and thermal tolerance, providing some compensation for climate warming. However, the metabolic shifts driving the positive response to elevated CO by these important ecosystem engineers remain unknown. We analyzed whole-plant performance and metabolic profiles of two geographically distinct eelgrass (Zostera marina L.) populations in response to CO enrichment. In addition to enhancing overall plant size, growth and survival, CO enrichment increased the abundance of Calvin Cycle and nitrogen assimilation metabolites while suppressing the abundance of stress-related metabolites. Overall metabolome differences between populations suggest that some eelgrass phenotypes may be better suited than others to cope with an increasingly hot and sour sea. Our results suggest that seagrass populations will respond variably, but overall positively, to increasing CO concentrations, generating negative feedbacks to climate change.
随着大气和海洋中 CO 含量的稳定上升，不同生物的反应可能会导致生态系统的输家和赢家。海洋 CO 的增加可以提高海草的生产力和耐热性，为气候变暖提供一定程度的补偿。然而，这些重要的生态系统工程师对升高的 CO 做出积极响应的代谢变化仍不清楚。我们分析了两个地理位置不同的鳗草（Zostera marina L.）种群对 CO 富集的整体植物性能和代谢特征。除了增加植物整体大小、生长和存活率外，CO 富集还增加了卡尔文循环和氮同化代谢物的丰度，同时抑制了与应激相关的代谢物的丰度。种群之间的整体代谢组差异表明，一些鳗草表型可能比其他表型更适合应对越来越热和酸化的海洋。我们的结果表明，海草种群对不断增加的 CO 浓度会有不同的反应，但总体上是积极的，从而对气候变化产生负反馈。
