Ocean acidification, the change in seawater carbonate chemistry due to the uptake of anthropogenic CO2, affects the physiology of marine organisms in multiple ways1. Diverse competitive and trophic interactions transform the metabolic responses to changes in community composition, seasonal succession and potentially geographical distribution of species. The health of ocean ecosystems depends on whether basic biotic functions are maintained, ecosystem engineers and keystone species are retained, and the spread of nuisance species is avoided2. Here, we show in a field experiment that the toxic microalga Vicicitus globosus has a selective advantage under ocean acidification, increasing its abundance in natural plankton communities at CO2 levels higher than 600 µatm and developing blooms above 800 µatm CO2. The mass development of V. globosus has had a dramatic impact on the plankton community, preventing the development of the micro- and mesozooplankton communities, thereby disrupting trophic transfer of primary produced organic matter. This has prolonged the residence of particulate matter in the water column and caused a strong decline in export flux. Considering its wide geographical distribution and confirmed role in fish kills3, the proliferation of V. globosus under the IPCC4 CO2 emission representative concentration pathway (RCP4.5 to RCP8.5) scenarios may pose an emergent threat to coastal communities, aquaculture and fisheries.
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The data of this mesocosm study are archived in the World Data Centre MARE/PANGAEA and can be downloaded using the following link: https://www.pangaea.de/?q=campaign%3A%22KOSMOS_2014%22.
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We thank the Oceanic Platform of the Canary Islands (Plataforma Oceánica de Canarias) for their hospitality and outstanding support and the Marine Science and Technology Park (Parque Científico Tecnológico Marino) for providing access to their facilities. We are grateful to the captains and crews of ESPS RV Hesperides for deploying and recovering the mesocosms (cruise 29HE20140924), and of RV Poseidon for transporting the mesocosms and for their support in testing the deep water collector during cruise POS463. The manuscript greatly benefited from the comments of two anonymous reviewers. This project was funded by the German Federal Ministry of Education and Research (BMBF) in the framework of the coordinated project BIOACID—Biological Impacts of Ocean Acidification, phase 2 (FKZ 03F06550). U.R. received additional funding from the Leibniz Prize 2012 by the German Research Foundation (DFG).