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Indices of microbial community richness (left panels) and diversity (right panels) for the three main sample types: massive ice, cryopeg brine and sea-ice brine. Massive ice samples (n = 4) differ significantly from cryopeg brines (n = 10) by every measure (** indicates P < 0.01 and *** indicates P < 0.001). Indices for sea-ice brines (n = 8) tend to be higher than cryopeg brines, also by every measure, but not significantly (e.g. P = 0.0796 for Shannon diversity index).
