Environmental bacteria increase population growth of hydra at low temperature.

Statistical comparison of treatment groups with PERMANOVA and pairwise Adonis showed significant differences between polyps cultured in lake water, autoclaved lake water and hydra medium in the two indices that focus on rare taxa (Jaccard presence-absence and unweighted UniFrac), a marginally significant Bray-Curtis and a nonsignificant weighted UniFrac ( Table 1 ).

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