Specialized Bacteroidetes dominate the Arctic Ocean during marine spring blooms.

Minority phyla (Actinobacteria, Planctomycetes, and Verrucomicrobia), showed a decreasing trend from around 3% in early spring to about 1.5% in late summer. 3.2.

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Thus, the change in Bacteroidetes species shows a clear trend toward species specialized in diatom polysaccharide degradation.

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