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Marine agar 2216 and Marine broth 2216 composition;. Composition of the cultivable bacterial community. (A) Proportion of phyla represented (92 bacterial strains). (B) Proportion of phyla as a function of different habitats (sea ice bottom: 28 strains; water column2 m: 38 strains; water column 40–60 m: 26 strains). For a better representation, the phylum of Proteobacteria was divided into two classes: γ-Proteobacteria and α-Proteobacteria. ;Bacterial growth in the (A) Chaetoceros neogracilis and (B) Fragilariopsis cylindrus cultures. Values stand for means of triplicate cultures and error bars show ±SD. ;Venn diagram showing the number of bacterial strains growing with the different microalgae exudates (C. neogracilis, F. cylindrus) and diluted Marine Broth (MB). (A) Bacterial strains isolated from sea ice. (B) Bacterial strains isolated at 2–3m depth. (C) Bacterial strains isolated at 40–60m depth.;Bacterial growth of (A) Strain BBCC770, Polaribacter filamentus and (B) Strain BBCC808, Maribacter arcticus with different dilutions of Marine broth (MB) with or without stirring. The different dilutions of MB contained the following dissolved organic carbon (DOC) concentrations: 1/25 = 8400 µM ; 1/50 = 4200 µM ; 1/100 = 2100 µM ; 1/250 = 840 µM ; 1/500 = 420 µM ; 1/1000 = 210 µM.