Figure 3: A scatter plot of Sable Island horse microbiome ASV richness versus standardized longitude coloured by parental status and shaped by sandwort presence in a 150-m radius buffer surrounding the point of sample collection. Points are shaped by whether sandwort is present (circle: ●) or absent (square: ■) and coloured by whether mares were with a foal (brown: ◙) or without a foal (light blue: ◙). Lines are parameterized by estimates from multi-model inference model averaging, typed by sandwort presence (present, dashed: —; absent, solid: ) and coloured by parental status (with a foal, brown: ; without a foal, light blue: ).