| Summary: | Global change is associated to the increase in temperature (T), nutrient inputs (Nut) and solar radiation in the water column. To address their joint impact on the net community production [NCP], respiration [CR] and PSII performance (Φ PSII) of coastal phytoplankton communities from the South Atlantic Ocean over a seasonal succession, we performed a factorial design. For this, we used a 2 x 2 x 2 matrix set-up, with and without UVR, ambient and enriched nutrients, and in situ T and in situ T + 3ºC. The future scenario of global change exerted a dual impact, from an enhancement of NCP and F PSII during the pre-bloom to an inhibition of both processes towards the bloom period, when the in situ T and irradiances were lower and the community was dominated by diatoms. The increased inhibition of NCP and Φ PSII during the most productive stage of the annual succession could produce signi fi cant alterations of the CO2-sink capacity of coastal areas in the future. Fil: Cabrerizo, Marco J. Fundación Playa Unión. Estación de Fotobiología Playa Unión; Argentina. Universidad de Granada; España Fil: Carrillo, Presentación. Universidad de Granada; España Fil: Villafañe, Virginia E. Fundación Playa Unión. Estación de Fotobiología Playa Unión; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Helbling, Eduardo Walter. Fundación Playa Unión. Estación de Fotobiología Playa Unión; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
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