Structural Diversity of Bacterial Communities Associated with Bloom-Forming Freshwater Cyanobacteria Differs According to the Cyanobacterial Genus

Abstract : The factors and processes driving cyanobacterial blooms in eutrophic freshwater ecosystems have been extensively studied in the past decade. A growing number of these studies concern the direct or indirect interactions between cyanobacteria and heterotrophic bacteria. The presence of bacteria that are directly attached or immediately adjacent to cyano-bacterial cells suggests that intense nutrient exchanges occur between these microorganisms. In order to determine if there is a specific association between cyanobac-teria and bacteria, we compared the bacterial community composition during two cyanobac-teria blooms of Anabaena (filamentous and N 2-fixing) and Microcystis (colonial and non-N 2 fixing) that occurred successively within the same lake. Using high-throughput sequencing, we revealed a clear distinction between associated and free-living communities and between cyanobacterial genera. The interactions between cyanobacteria and bacteria appeared to be based on dissolved organic matter degradation and on N recycling, both for N 2-fixing and non N 2-fixing cyanobacteria. Thus, the genus and potentially the species of cyanobacteria and its metabolic capacities appeared to select for the bacterial community in the phycosphere.
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Imen Louati, Noémie Pascault, Didier Debroas, Cécile Bernard, Jean-François Humbert, et al.. Structural Diversity of Bacterial Communities Associated with Bloom-Forming Freshwater Cyanobacteria Differs According to the Cyanobacterial Genus. PLoS ONE, Public Library of Science, 2015, 10 (11), pp.e0140614. ⟨10.1371/journal.pone.0140614⟩. ⟨hal-01272957⟩

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