It is well established that the release of anthropogenic‐derived CO₂ into the atmosphere will be mainly absorbed by the oceans, with a concomitant drop in pH, a process termed ocean acidification. As such, there is considerable interest in how changes in increased CO₂ and lower pH will affect marine biota, such as bacteria, which play central roles in oceanic biogeochemical processes. Set within an ecological framework, we investigated the direct effects of elevated CO₂, contrasted with ambient conditions on the resistance and resilience of marine bacterial communities in a replicated temporal seawater mesocosm experiment. The results of the study strongly indicate that marine bacterial communities are highly resistant to the elevated CO₂ and lower pH conditions imposed, as demonstrated from measures of turnover using taxa–time relationships and distance–decay relationships. In addition, no significant differences in community abundance, structure or composition were observed. Our results suggest that there are no direct effects on marine bacterial communities and that the bacterial fraction of microbial plankton holds enough flexibility and evolutionary capacity to withstand predicted future changes from elevated CO₂ and subsequent ocean acidification.

中文翻译：

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海洋细菌群落对升高的二氧化碳水平有抵抗力。

众所周知，人为源的CO ₂释放到大气中将主要被海洋吸收，同时pH下降，这一过程称为海洋酸化。因此，对于增加的CO ₂和较低的pH值的变化将如何影响海洋生物区系（例如细菌）产生了相当大的兴趣，而海洋生物区系在海洋生物地球化学过程中起着重要作用。在一个生态学框架内，我们研究了CO ₂浓度升高的直接影响，并与环境条件进行了对比，在一个复制的暂时性海水中膜试验中对海洋细菌群落的抗性和复原力进行了研究。研究结果强烈表明，海洋细菌群落对升高的CO ₂具有高度抵抗力并使用较低的pH条件，如使用分类-时间关系和距离-衰减关系的周转率测量结果所示。另外，在群落丰度，结构或组成上没有观察到显着差异。我们的研究结果表明，对海洋细菌群落没有直接影响，微生物浮游生物的细菌级分具有足够的灵活性和进化能力，可以承受因CO ₂浓度升高和随后的海洋酸化而产生的预期未来变化。