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Dynamique des communautes bacteriennes d'une eau lagunaire enrichie en azote

By Fvan Wambeke, Mag Bianchi and Ajm Bianchi

Abstract

In Arcachon lagoon water, bacterial populations were defined by direct counts, plate counts, structure and diversity of communities, and AMP. ADP and ATP were also measured in two opposite ecological situations: autumn (temperature still high), and winter (low temperature). We used batches of 6 and 50-l in which the sea water was enriched with ammonium chlorid or amino-acids to about 500 mu Atg N.1 super(-1). The experiment lasted 24 hrs. with a sampling interval of 3 hrs, during the first 12 hrs., and a final sample at 24 hrs. The fall commmunities reacted quickly (6 hrs) and responses to organic nitrogen were more pronounced. The community structure showed immature states (zymogenous bacteria responding easily to stress. On the contrary, no response was observed during winter which may mean that the lag phase lasted longer than 24 hrs. Community structure indicated a mature state (autochtonous bacteria)

Publisher: Gauthier-Villars
Year: 1982
OAI identifier: oai:archimer.ifremer.fr:35742
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