Abstract
The fluctuations of the bacterial number and the qualitative composition of heterotrophic bacteria were investigated using an experimental marine ecosystem (AME) of 7001, attempting to produce Euterpina acutifrons (Dana) from a monoxenic culture of Phaeodactylum tricorntum Bohlin. During the complete cycle of the system, installation phase, algae growth phase, algae decomposition phase, the bacterial communities homeostasis was tested using aliquots of the AME, severely disturbed via amino acids enrichment. In three identical batches, the bacterial populations showed similar quantitative and qualitative evolutions which all depended on the nature (phytoplanktonic exudates or dead cells) of the carbonaceous compounds from photosynthetic origin. If bacterial communities stayed in a diversified state of organization, considering the physiological and nutritional diversity, quick evolutions were demonstrated.
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