title: Differential impacts of global change variables on coastal South Atlantic phytoplankton: Role of seasonal variations.
abstract: 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 (ΦPSII) of coastal phytoplankton communities from the South Atlantic Ocean over a seasonal succession, we performed a factorial design. For this, we used a 2 × 2 × 2 matrix set-up, with and without UVR, ambient and enriched nutrients, and in situ T and in situ T + 3 °C. The future scenario of global change exerted a dual impact, from an enhancement of NCP and ΦPSIIduring 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 ΦPSIIduring the most productive stage of the annual succession could produce significant alterations of the CO2-sink capacity of coastal areas in the future.
authors.affiliation: Estación de Fotobiología Playa Unión, Casilla de Correos 15, 9103, Rawson, Chubut, Argentina; Departamento de Ecología, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva s/n, 18071, Granada, Spain. Electronic address: mjc@ugr.es.
authors.forename: Marco J
authors.initials: MJ
authors.lastname: Cabrerizo
authors.affiliation: Instituto Universitario de Investigación del Agua, Universidad de Granada, C/ Ramón y Cajal, 4, 18071, Granada, Spain. Electronic address: pcl@ugr.es.
authors.forename: Presentación
authors.initials: P
authors.lastname: Carrillo
authors.affiliation: Estación de Fotobiología Playa Unión, Casilla de Correos 15, 9103, Rawson, Chubut, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Electronic address: virginia@efpu.org.ar.
authors.forename: Virginia E
authors.initials: VE
authors.lastname: Villafañe
authors.affiliation: Estación de Fotobiología Playa Unión, Casilla de Correos 15, 9103, Rawson, Chubut, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Electronic address: whelbling@efpu.org.ar.
authors.forename: E Walter
authors.initials: EW
authors.lastname: Helbling
mesh_terms: D001267:Atlantic Ocean; D017377:Diatoms / Q000502:physiology; D004784:Environmental Monitoring / Q000379:methods*; D010839:Phytoplankton / Q000502:physiology*; D012621:Seasons; D013696:Temperature; D014466:Ultraviolet Rays; D014873:Water Pollutants / Q000032:analysis
chemical_list: D014873:Water Pollutants
keywords: Community respiration; Global change; Net community production; Nutrient inputs; PSII photochemistry; Ultraviolet radiation; Warming