Canonical correspondence analysis (CCA) of the relationship between the relative abundance of bacteria (phylum level) and the percentage of muscle fatty acid (FA, environmental variables).

Microbial phyla are shown as yellow triangles, and muscle FAs are shown as blue arrows. Microbial phyla can be vertically projected along the ray elongated from the blue arrows. The abundance was measured as the relative distance from the projection to the arrow, and the distance along the direction of the arrow was considered an increase (and vice versa). Acute and obtuse angles between the environmental variables and phyla were considered positive and negative correlations, respectively.