Core symbionts, age at inoculation and diet affect colonization of the bumblebee gut by a common bacterial pathogen.

Serratia significantly reduced bee survival ( χ 2 = 10.84, p < 0.001), and there was a nonsignificant trend for such effects to be stronger in the absence of the core gut microbiome ( χ 2 = 3.53, p = 0.060; Figure 5a ), although there was no detectable main effect of core microbiome treatment ( χ 2 = 0.41, p = 0.503; Figure 5a ).

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