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- W2017258191 abstract "Release of amino acids was examined in the laboratory in the form of dissolved primary amine (DPA) by two marine planktonic protozoa (the oligotrichous ciliate, Strombidium sulcatum and the aplastidic flagellate Pseudobodo sp.) grazing on bacteria. DPA release rates were high (19–25 × 10−6 and 1.8–2.3 × 10−6 μmol DPA cell−1 h−1 for flagellates and ciliates, respectively) during the exponential phase, when the ingestion rates were maximum. Release rates were lower during the other growth phases. The release of DPA accounted for 10 % (flagellates) and 16 % (ciliates) of the total nitrogen ingested. Our data suggest that the release of DPA by protozoa could play an important role in supporting bacterial and consequently autotrophic pico- and nanoplankton growth, especially in oligotrophic waters, where the release of phytoplanktonic dissolved organic matter is low. Les taux d'excrétion d'acides aminés par deux protozoaires planktoniques marins (un cilié oligotriche, Strombidium sulcatum, et un flagellé hétérotrophe, Pseudobodo sp.), nourris avec des bactéries inactivées (par choc de température) ont été quantifiés expérimentalement. Les valeurs maximales sont mesurées en début de phase exponentielle et sont comprises entre 19 et 25 × 10−6 μmol·cellule−1·h−1 pour les flagellés, entre 1,8 et 2,3 × 10−6 μmol·cellule−1·h−1 pour les ciliés. Elles correspondent aux valeurs maximales des taux d'ingestion. Les flagellés et ciliés excrètent au maximum 10 et 16 % de l'azote ingéré sous forme d'acides aminés. Les acides aminés provenant des protozoaires pourraient jouer un rôle important dans la croissance des bactéries et du pico- et nanoplancton autotrophe, notamment dans les milieux oligotrophes où l'excrétion phytoplanctonique de matière organique dissoute est faible." @default.
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- W2017258191 title "Release of dissolved amino acids by flagellates and ciliates grazing on bacteria" @default.
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