||Purvina S1, Béchemin Christian2, Balode M1, Verite Celine2, Arnaud Christophe2, Maestrini Serge Y2
||1 : Latvian Institute of Aquatic Ecology, Daugavgrivas Str. 8, LV-1048 Riga, Latvia
2 : Centre de Recherche en Ecologie Marine et Aquaculture de L.Houmeau (CNRS-IFREMER), B.P. 5, F-17137 L.Houmeau, France
||Estonian Journal of Ecology (1736-602X) (Estonian Academy Publishers), 2010 , Vol. 59 , N. 3 , P. 184-196
||Microcystis aeruginosa, Heterotrophic bacteria, DOM, DON, Nitrates, Ammonia
||The use of riverine dissolved organic matter by the heterotrophic bacteria associated with a culture of the cyanobacterium Microcystis aeruginosa and release of simple nitrogen compounds were studied in an experimental series. Bacteria reduced the bulk of dissolved organic nitrogen (DON) by half, but when associated with M. aeruginosa, DON was excreted and its concentration rose by 13%. During the stationary growth phase bacteria released ammonium, doubling the concentration of ammonia as well as of nitrates. Bacteria associated with M. aeruginosa consumed riverine DON and joined the ammonification and nitrification process, supplying cyanobacteria with simple nitrogen compounds.
|Publisher's official version