Figure 4: The Sable Island horse faecal microbiome β-diversity (Euclidean distance centred log-transformed counts) visualized in (A) a PCA coloured by sandwort availability in 150-m radius buffers surrounding the point of sample collection (absent, dark green: ●, present, gold: ●) and (B) a scatterplot of Euclidean distance and the longitudinal distance separating horses, points coloured depending on whether 150-m spatial buffer contained sandwort for neither horse (dark green: ●), only one horse (green: ●), or both horses (gold: ●). For ease of plot visualization, a single point was omitted from panel ‘(B)’ corresponding to two horses of the same social band sampled at the same location (longitudinal separation = 0, Euclidean distance = 69).