Changes in log-abundance of core microbial OTUs associated with the intake of wild, natural, and artificial diets. Columns are arranged chronologically within each captive diet category, and each column represents an individual sample. Darker shades indicate higher abundances and lighter shades represent lower abundances. Core OTUs are shown to the lower taxonomic unit. FDR: *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001