Host Immunity Alters Community Ecology and Stability of the Microbiome in a Caenorhabditis elegans Model.

When the reporter strain is colonized on a metacommunity of seven bacterial species from the native worm microbiome (MYb27, -45, -53, -71, -120, -181, and -238), there is a nonsignificant trend in increased activity over the first few days of colonization in liquid culture (median log-transformed GFP day 1 = 1.49, day 3 = 1.39; Wilcoxon P value = 0.088, Holm corrected).

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N2 wild-type worms showed a negative trend in the relationship between diversity (measured as Shannon H) and total microbiome size (CFU per worm in individual worms) ( Fig. 3A ), although the considerable compositional and structural variation in these communities ( Fig. 1 ) results in a poor overall fit for the simple linear model ( Table S1 ).

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