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Richness and abundance of the rare biosphere. The 2535 rare biosphere OTUs (relative abundance < 0.01%) were subdivided into those that occurred either in ice brine (IB) or in the immediate sub-ice seawater (SW) or in both habitats (IB+SW). a Venn diagram showing OTU richness. b The % richness (% of the total number of unique rare biosphere OTUs) and % abundance (% of the total number of sequences of rare biosphere OTUs) at the family level
