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. Compared to the rest of the globe, the Arctic Ocean is affecteddisproportionately by climate change. Despite these fast environmentalchanges, we currently know little about the effects of ocean acidification(OA) on marine key species in this area. Moreover, the existing studiestypically test the effects of OA under constant, hence artificial, lightfields. In this study, the abundant Arctic picoeukaryote Micromonas pusilla was acclimated tocurrent (400  µ atm) and future (1000  µ atm) pCO2 levels under aconstant as well as a dynamic light, simulating more realistic light fields asexperienced in the upper mixed layer. To describe and understand theresponses to these drivers, growth, particulate organic carbon (POC)production, elemental composition, photophysiology and reactive oxygenspecies (ROS) production were analysed. M. pusilla was able to benefit from OA onvarious scales, ranging from an increase in growth rates to enhancedphotosynthetic capacity, irrespective of the light regime. These beneficialeffects were, however, not reflected in the POC production rates, which canbe explained by energy partitioning towards cell division rather thanbiomass build-up. In the dynamic light regime, M. pusilla was able to optimize itsphotophysiology for effective light usage during both low- and high-lightperiods. This photoacclimative response, which was achieved by modificationsto photosystem II (PSII), imposed high metabolic costs leading to areduction in growth and POC production rates when compared to constantlight. There were no significant interactions observed between dynamic lightand OA, indicating that M. pusilla is able to maintain effective photoacclimationwithout increased photoinactivation under high pCO2 . Based on thesefindings, M. pusilla is likely to cope well with future conditions in the ArcticOcean.

The Arctic picoeukaryote &lt;i&gt;Micromonas pusilla&lt;/i&gt; benefits from ocean acidification under constant and dynamic light

The Arctic picoeukaryote <i>Micromonas pusilla</i> benefits from ocean acidification under constant and dynamic light