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Microorganisms self-organize in very large communities exhibiting complexfluctuations. Despite recent advances, still the mechanism by which thesesystems are able to exhibit large variability at the one hand and dynamicalrobustness on the other, is not fully explained. With that motivation, here weanalyze three aspects of the dynamics of the microbiota and plankton: thedensity fluctuations, the correlation structure and the avalanching dynamics.In all communities under study we find that the results exhibits scale-freedensity fluctuations, anomalous variance' scaling, scale-free abundancecorrelations and stationary scale-free avalanching dynamics. These behaviors,typical in systems exhibiting critical dynamics, suggest criticality as apotential mechanism to explain both the robustness and (paradoxical) highirregularity of processes observed in very large microbial communities.

Scale free density and correlations fluctuations in the dynamics of large microbial ecosystems