Table 2. Five unique classes were significantly differentially abundant between groups of interest. ANCOM was conducted at the class level within four subsets of data: Santa Cruz Island (SCZ) samples only, Santa Rosa Island (SRI) samples only, island spotted skunks only, and island foxes only. Across species comparisons returned four unique classes, with Deltaproteobacteria and Gammaproteobacteria consistently more abundant in foxes across both islands. Within species comparisons returned one differentially abundant class between skunk populations, with no significant results between island fox populations. The table includes the Phylum and Class of each significant result alongside the ANCOM test statistic (W, which indicates the number of times the null hypothesis was rejected for a given class), the dataset used for the analysis, and the direction of change (i.e. , which group exhibited higher abundance).