TY - CPAPER T1 - Prise simultanee de quatre sources d'azote par le microphytobenthos du chenal de Lauzieres (Charente Maritime-France) en ete A1 - Collos,Y UR - https://archimer.ifremer.fr/doc/00000/1532/ KW - Pond culture KW - Interactions KW - Nitrogen compounds KW - Phytobenthos KW - Food conversion KW - Urea KW - Ammonium compounds KW - Nitrites KW - Nitrates N2 - Simultaneous uptake of nitrate, nitrite, ammonium and urea by microphytobenthos incubated in batch mode immediately after sampling do not show any kind of interactions. A linear relationship is found between nitrate uptake and ammonium uptake, the latter values being about 2 to 3 times higher than former. Ammonium uptake was not saturated by a substrate level of 10 mu M, possibly indicating diffusion limited uptake. For all nitrogen sources, the uptake rate was related to the substrate concentration rather than the oxidation state of the nitrogen compounds. Y1 - 1984/11 CY - Production et relations trophiques dans les ecosystemes marins. Yalta 27 Octobre-2 Novembre 1984 SO - Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1984 ID - 1532 ER -