TY - JOUR T1 - Influence of nitrogen enrichment on size-fractionated in vitro carboxylase activities of phytoplankton from Thau Lagoon (Coastal Mediterranean Lagoon, France) A1 - Fouilland,Eric A1 - Descolas Gros,Chantal A1 - Collos,Yves A1 - Vaquer a,André A1 - Souchu,Philippe A1 - Gasc,Anne A1 - Bibent,Bertrand A1 - Pons,Virginie AD - Univ Montpellier 2, Lab Hydrobiol Marine & Continentale, UMR 5556, F-34095 Montpellier 05, France. AD - Stn IFREMER, Lab Ecol, F-34200 Sete, France. UR - https://archimer.ifremer.fr/doc/00000/451/ DO - 10.1016/S0022-0981(02)00235-6 KW - Heterotrophy KW - Autotrophy KW - Nitrogen enrichments KW - Size fractionated phytoplankton KW - Carboxylase activities N2 - The influence of dissolved inorganic and organic nitrogen (DIN and DON) enrichments on pools of enzymes responsible for CO2 fixation by the Calvin-Benson (Rubisco) and beta-carboxylation pathways (beta-carboxylases) were studied in a natural plankton assemblage. The plankton community from a coastal Mediterranean lagoon were incubated in situ for 24 h with initially ammonium, nitrate and DON (taurine) enrichments and compared to a control without any enrichment. An increase of small picophytoplankton and diatom biomass was observed in the enriched inorganic nitrogen treatments 7 - 10 h after the initial enrichment. Phytoplankton biomass decreased in the control and under taurine enrichment suggesting an inorganic nitrogen limitation of phytoplankton growth. Y1 - 2002/08 PB - Elsevier JF - Journal of Experimental Marine Biology and Ecology SN - 0022-0981 VL - 275 IS - 2 SP - 147 EP - 171 ID - 451 ER -