Research press release





以前の研究では、海洋酸性化はサンゴ礁魚類の行動能力と感覚能力に影響を及ぼすことが示唆されているが、対象種と研究方法が類似した研究の間でも結果がばらついている。今回、Timothy Clark、Josefin Sundinたちの研究グループは、野生状態と水槽内の魚類種(6種、900個体以上)を対象とした3年間にわたる研究で、過去の研究報告の再現性を検証した。この研究では、捕食者の回避、活動レベル、行動的側性化(活動時に脳のいずれかの半球が優位に用いられていること)が検討され、このようなサンゴ礁魚類の重要な行動が酸性化の増大の影響を受けないことが判明した。


Ocean acidification due to rising CO2 levels may have a negligible impact on critical behaviours of coral reef fishes, reports a paper published in Nature. The findings, which challenge previous research, are the results of a multi-year, multi-species project aimed at assessing the impact of ocean acidification on coral reef fishes.

By the end of the century, the acidification of the oceans is expected to exceed what the planet has experienced in the past 30 million years, which has sparked concerns for the stability of marine ecosystems.

Previous research has suggested that ocean acidification will affect the behavioural and sensory capacity of coral reef fishes; however, there are disparities in results between studies, even when species and methods are similar. Timothy Clark, Josefin Sundin and colleagues tested the reproducibility of previous reports in a three-year study of over 900 individuals of six different fish species in both wild and tank settings. They examined predator avoidance, activity levels and behavioural lateralization (favouring one side of the brain during activities) and found that increased acidification does not impact these critical behaviours of coral reef fishes.

The scale and scope of this study, compared with previous reports, may explain the differing conclusions. The authors encourage future replication of investigations into the effects of rising CO2 levels on fish behaviours. They also stress that the increasing atmospheric CO2 is linked to ocean warming, which is having a profound effect on marine fishes.

doi: 10.1038/s41586-019-1903-y

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