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Effects of acidified seawater on early life stages of scleractinian corals (Genus Acropora)

机译：酸化海水对巩膜珊瑚（Acropora属）早期生命的影响

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摘要

Ocean acidification, caused by increased atmospheric carbon dioxide (CO2) concentrations, is currently an important environmental problem. It is therefore necessary to investigate the effects of ocean acidification on all life stages of a wide range of marine organisms. However, few studies have examined the effects of increased CO2 on early life stages of organisms, including corals. Using a range of pH values (pH 7.3, 7.6, and 8.0) in manipulative duplicate aquarium experiments, we have evaluated the effects of increased CO2 on early life stages (larval and polyp stages) of Acropora spp. with the aim of estimating CO2 tolerance thresholds at these stages. Larval survival rates did not differ significantly between the reduced pH and control conditions. In contrast, polyp growth and algal infection rates were significantly decreased at reduced pH levels compared to control conditions. These results suggest that future ocean acidification may lead to reduced primary polyp growth and delayed establishment of symbiosis. Stress exposure experiments using longer experimental time scales and lower levels of CO2 concentrations than those used in this study are needed to establish the threshold of CO2 emissions required to sustain coral reef ecosystems. Keywords Carbon dioxide - Coral - Early life stages - Ocean acidification R. Suwa and M. Nakamura contributed equally to this work.
机译：大气中二氧化碳（CO 2 ）浓度升高引起的海洋酸化目前是一个重要的环境问题。因此，有必要研究海洋酸化对各种海洋生物所有生命阶段的影响。然而，很少有研究检查CO 2 增加对包括珊瑚在内的生物早期阶段的影响。使用操纵性重复水族箱实验中的一系列pH值（pH 7.3、7.6和8.0），我们评估了CO 2 的增加对棘爪鱼生命早期阶段（幼虫和息肉阶段）的影响。 。目的是估算这些阶段的CO 2 耐受阈值。在降低的pH值和对照条件之间，幼虫存活率没有显着差异。相反，与对照条件相比，在降低的pH值下息肉的生长和藻类感染率显着降低。这些结果表明，未来的海洋酸化可能导致原发性息肉的生长减少和共生的建立延迟。需要使用比本研究更长的实验时间尺度和更低水平的CO 2 浓度进行暴露实验，以建立维持珊瑚礁所需的CO 2 排放阈值生态系统。关键词二氧化碳-珊瑚-生命的早期阶段-海洋酸化R. Suwa和M. Nakamura对这项工作做出了同样的贡献。

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