海洋酸化对原位珊瑚礁代谢的影响。,Scientific Reports

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海洋酸化对原位珊瑚礁代谢的影响。
Scientific Reports ( IF 3.8 ) Pub Date : 2019-08-19 , DOI: 10.1038/s41598-019-48407-7
Steve S Doo ₁ , Peter J Edmunds ₁ , Robert C Carpenter ₁

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人类世的气候在很大程度上是由大气中二氧化碳的快速增加所引起的，从而导致全球气候变化（变暖）和海洋酸化（OA，海洋pH降低）。OA对于珊瑚礁特别重要，因为碳酸盐离子可利用性的相关降低会削弱生物钙化并促进碳酸盐基质的溶解。尽管这些趋势最终影响到生态系统的钙化，但是对生物对OA的反应进行规模化实验分析以考虑生态系统对OA的反应已证明是困难的。通过自由海洋CO2富集（FOCE）提供了生态系统级实验以研究OA的影响的基准，我们在本次分析中将其用于法属波利尼西亚Mo'orea背礁的21天实验。在原地孵化了两个天然珊瑚礁群落，其中一种暴露于环境pCO2（393 µatm），另一种暴露于高pCO2（949 µatm）。我们的结果显示，在高pCO2下，24小时净群落钙化（NCC）减少，而夜间NCC减少，在21天后衰减并最终逆转。在白天的NCC中未观察到这种影响，并且在高pCO2对净社区生产（NCP）没有任何影响的情况下发生。这些结果有助于先前对珊瑚礁对本世纪末预计的OA条件的生态系统级反应的研究，并且突出了高pCO2对夜间净群落钙化的潜在影响。夜间NCC的减少会减弱并最终在21天之内逆转。在白天的NCC中未观察到这种影响，并且在高pCO2对净社区生产（NCP）没有任何影响的情况下发生。这些结果有助于先前关于珊瑚礁对本世纪末预计的OA条件的生态系统级反应的研究，并且强调了高pCO2对夜间净群落钙化的潜在抑制作用。夜间NCC的减少会减弱并最终在21天之内逆转。在白天的NCC中未观察到这种影响，并且在高pCO2对净社区生产（NCP）没有任何影响的情况下发生。这些结果有助于先前对珊瑚礁对本世纪末预计的OA条件的生态系统级反应的研究，并且突出了高pCO2对夜间净群落钙化的潜在影响。

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Ocean acidification effects on in situ coral reef metabolism.

The Anthropocene climate has largely been defined by a rapid increase in atmospheric CO2, causing global climate change (warming) and ocean acidification (OA, a reduction in oceanic pH). OA is of particular concern for coral reefs, as the associated reduction in carbonate ion availability impairs biogenic calcification and promotes dissolution of carbonate substrata. While these trends ultimately affect ecosystem calcification, scaling experimental analyses of the response of organisms to OA to consider the response of ecosystems to OA has proved difficult. The benchmark of ecosystem-level experiments to study the effects of OA is provided through Free Ocean CO2 Enrichment (FOCE), which we use in the present analyses for a 21-d experiment on the back reef of Mo'orea, French Polynesia. Two natural coral reef communities were incubated in situ, with one exposed to ambient pCO2 (393 µatm), and one to high pCO2 (949 µatm). Our results show a decrease in 24-h net community calcification (NCC) under high pCO2, and a reduction in nighttime NCC that attenuated and eventually reversed over 21-d. This effect was not observed in daytime NCC, and it occurred without any effect of high pCO2 on net community production (NCP). These results contribute to previous studies on ecosystem-level responses of coral reefs to the OA conditions projected for the end of the century, and they highlight potential attenuation of high pCO2 effects on nighttime net community calcification.

更新日期：2019-08-19

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