Table S1 Sample ID (Sample Site and Body Number) Cad1 (Mouth 006) Cad2 (Sm. Intestine 006) Cad3 (Transverse Colon 006) Cad4 (Body Cavity 006) Cad5 (Body Cavity 006) Cad6 (Mouth 016) Cad7 (Body Cavity 016) Cad8 (Transverse Colon 016) Cad9 (Mouth 006) Cad10 (Fecal 006) Cad11 (Mouth 006) Cad12 (Sigmoidal Colon 006) Cad13 (Mouth 016) Cad14 (Fecal 016) Cad15 (Fecal 016) Cad16 (Stomach 016) Cad17 (Mouth 016) Cad18 (Sm. Intestine 016) Number of Sequences Post-Trimming 7814 4503 11046 0 8019 10146 0 10163 8266 6565 5567 10634 7392 8126 7483 3199 3957 1770 Number of Sequences After Singleton Removal 7762 4492 10897 0 7960 10060 0 9997 8258 6550 5505 10433 7308 7732 7205 3184 3933 1747 STAFS 2011- 006 Mouth pre-bloat swab Mouth pre-bloat scrape Genus Abundance Genus Abundance Staphylococcus (Firmicutes) 57.0% Pseudomonas (Proteobacteria) 90.6% Peptoniphilus (Firmicutes) 18.8% Clostridium (Firmicutes) 8.83% Lactobacillus (Firmicutes) Ignatzschineria (Proteobacteria) Unclassified, Family Staphylococcaceae Unclassified, Class Bacilli 5.40% 1.37% 1.06% Streptococcus (Firmicutes) 0.618% 1.04% Unclassified, Family 0.570% Peptostreptococcaceae Unclassified, Family 0.490% Carnobacteriaceae Mouth end bloat scrape Peptoniphilus (Firmicutes) 41.9% Clostridium (Firmicutes) 22.5% Unclassified, Family 12.1% Clostridiaceae Lactobacillus (Firmicutes) 4.70% Staphylococcus (Firmicutes) 4.58% Unclassified, Family Clostridiaceae Unclassified, Family Carnobacteriaceae Peptostreptococcus (Firmicutes) 4.32% Unclassified, Family Peptostreptococcaceae Sphingomonas (Proteobacteria) Transverse colon swab Lactobacillus (Firmicutes) Clostridium (Firmicutes) Unclassified, Family Peptostreptococcaceae Escherichia (Proteobacteria) 0.944% 1.74% 1.18% 0.727% 25.3% 20.1% 11.8% 11.7% Eggerthella (Firmicutes) Bacteroides (Bacteroidetes) 7.75% 4.26% Akkermansia (Verrucomicrobia) Unclassified, Family Enterobacteriaceae 3.62% 2.61% Unclassified, Family Pseudomonadaceae Unclassified Genus, Class Gammaproteobacteria Lactobacillus (Firmicutes) Atopobium (Firmicutes) Streptococcus (Firmicutes) 6.36% 1.62% 0.560% 0.411% 0.230% Propionibacterium (Actinobacteria) Unclassified, Family Clostridiaceae Sphingomonas (Proteobacteria) 0.048% Unclassified, Family Bacillaceae 0.024% 0.048% 0.048% Small intestine end bloat swab Clostridium (Firmicutes) 59.8% Lactobacillus (Firmicutes) 28.9% Sphingomonas (Proteobacteria) 1.49% Unclassified Unclassified, Family Comamonadaceae Unclassified, Family Peptostreptococcaceae Unclassified Bacteria 1.27% 1.18% Unclassified, Family Clostridiaceae Eggerthella (Firmicutes) 0.801% Unclassified, Order Rickettsiales Sigmoidal colon swab Bacteroides (Bacteroidetes) Clostridium (Firmicutes) Lactobacillus (Firmicutes) Unclassified, Family Rikenellaceae Escherichia (Proteobacteria) Unclassified, Family Ruminococcaceae Eggerthella (Firmicutes) Eubacterium (Firmicutes) 1.16% 1.14% 0.712% 0.490% 42.0% 17.3% 5.12% 4.51% 3.98% 3.43% 2.96% 2.16% Unclassified, Family Lachnospiraceae Eubacterium (Firmicutes) Fecal scrape Pseudomonas (Proteobacteria) Unclassified, Family Pseudomonadaceae Psychrobacter (Proteobacteria) Unclassified, Class Gammaproteobacteria Unclassified, Family Moraxellaceae Dorea (Firmicutes) Peptoniphilus (Firmicutes) Bacteroides (Bacteroidetes) Streptococcus (Firmicutes) Unclassified Bacteria 1.87% 1.10% 85.0% 7.98% Unclassified, Family Peptostreptococcaceae Unclassified, Family Lachnospiraceae Body cavity end bloat swab Escherichia (Proteobacteria) Eubacterium (Firmicutes) 1.85% 1.29% 24.6% 13.2% 3.11% 2.0% Erwinia (Proteobacteria) Clostridium (Firmicutes) 13.1% 10.9% 0.687% Lactobacillus (Firmicutes) 6.11% 0.153% 0.137% 0.122% Collinsella (Firmicutes) Ruminococcus (Firmicutes) Unclassified Genus, Family Enterobacteriaceae Bacteroides (Bacteroidetes) Eggerthella (Firmicutes) 5.98% 5.87% 4.75% 0.122% 0.076% 2.90% 1.68% Supplementary Table 2: Relative abundances of the top ten genera present in each sample from body 006. STAFS 2011- 016 Mouth pre-bloat swab Genus Abundance Streptococcus (Firmicutes) 32.5% Prevotella (Bacteroidetes) 11.2% Veillonella (Firmicutes) 9.74% Unclassified, Family Gemellaceae 5.83% Atopobium (Firmicutes) 4.50% Unclassified, Family 3.96% Clostridiaceae Unclassified, Family 2.78% Carnobacteriaceae Megasphaera (Firmicutes) 2.71% Dialister (Firmicutes) 1.88% Actinomyces (Actinobacteria) 1.60% Mouth end bloat scrape Unclassified, Family Planococcaceae Ignatzschineria (Proteobacteria) Unclassified, Family Clostridiaceae Unclassified, Order Bacillales Unclassified, Family Clostridiaceae Unclassified, Family Carnobacteriaceae Erysipelothrix (Firmicutes) Unclassified, Phylum Firmicutes 31.8% Fecal scrape Unclassified, Family Ruminococcaceae Megasphaera (Firmicutes) Fusobacterium (Fusobacteria) Unclassified, Family Clostridiaceae Stomach end bloat scrape Morganella (Proteobacteria) 1.79% 1.63% 1.46% 85.8% 26.0% 11.1% Unclassified Unclassified Bacteria 6.98% 2.30% 8.64% 4.86% Eggerthella (Firmicutes) Unclassified, Family Carnobacteriaceae Sphingomonas (Proteobacteria) 1.32% 0.911% 4.32% 2.92% 2.39% Vagococcus (Firmicutes) 1.93% Unclassified, Order Bacilli 1.30% Small intestine end bloat scrape Unclassified 37.1% Unclassified, Family Clostridiaceae Unclassified Bacteria Unclassified, Family Peptostreptococcaceae Faecalibacterium (Firmicutes) Klebsiella (Proteobacteria) Collinsella (Firmicutes) Unclassified, Family Ruminococcaceae Clostridium (Firmicutes) Streptococcus (Firmicutes) Mouth pre-bloat scrape Genus Abundance Microbacterium (Actinobacteria) 35.1% Streptococcus (Firmicutes) 13.8% Prevotella (Bacteroidetes) 9.34% Unclassified 9.21% Veillonella (Firmicutes) 5.61% Unclassified, Order 3.71% Actinomycetales Unclassified Bacteria 2.94% 26.3% 0.597 Unclassified, Family 0.440% Coprobacillaceae Propionibacterium 0.314% (Actinobacteria) Vagococcus (Firmicutes) 0.251% Unclassified, Order Rickettsiales 0.220% Transverse colon end bloat swab Unclassified, Family 24.5% Coprobacillaceae Unclassified 22.8% 13.1% 6.30% Eggerthella (Firmicutes) Eubacterium (Firmicutes) 20.2% 3.27% 4.30% 2.29% 1.15% 0.973% Escherichia (Proteobacteria) Parabacteroides (Bacteroidetes) Ruminococcus (Firmicutes) Bifidobacterium (Actinobacteria) 3.03% 2.07% 1.87% 1.71% 0.801% 0.744% Enterococcus (Firmicutes) Unclassified, Family Ruminococcaceae Fecal Scrape Unclassified, Family Peptostreptococcaceae 1.59% 1.47% 23.9% 22.4% Faecalibacterium (Firmicutes) 12.6% Unclassified, Ruminococcaceae 12.3% 10.0% Eubacterium (Firmicutes) Collinsella (Firmicutes) Ruminococcus (Firmicutes) Ruminococcus (Firmicutes) Unclassified, Family Peptostreptococcaceae Unclassified, Family Lachnospiraceae Unclassified, Class Clostridia 6.74% 4.44% 3.74% 2.99% 2.83% 2.73% Unclassified, Family Ruminococcaceae Collinsella (Firmicutes) Klebsiella (Proteobacteria) 9.81% Faecalibacterium (Firmicutes) Turicibacter (Firmicutes) Megasphaera (Firmicutes) Unclassified, Family Ruminococcaceae Eubacterium (Firmicutes) 4.57% 4.47% 4.22% 4.09% Unclassified, Family Clostridiaceae 2.96% 7.18% 6.51% 3.18% Supplementary Table 3: Relative abundances of the top ten genera present in each sample from body 016.