Fig. 4
Rickettsia abundance covaries with community composition. Principal Coordinate Analysis of Bray-Curtis dissimilarities overlaid with envfit vectors for tick symbionts. Of these abundance vectors, only Rickettsia and Rickettsiella correlated significantly to the principal components (p = 0.001 for both). Nagelkerke’s pseudo-R 2 for different ordinal logistic regression models fitting scaled Rickettsia and Rickettsiella abundances is provided in Additional file 4: Table S6