Taxonomic representation of key genes in fermentative pathways found in all four metagenomes.

aincludes butyryl and 3-hydroxybutyryl-CoA hydrogenases, enoyl-CoA hydratase, and acetyl-CoA acetyltransferase. bincludes (in decreasing order) Chloroflexi, Euryarchaeota, Verrucomicrobia, Cyanobacteria, Deinococcus, Planctomycetes and Spirochaetes. ctests the null hypothesis that the percentages are the same across the three columns. Legend: Similarities to these genes (as annotated in SEED) were combined by the genus in which they were found and the 50 most abundant genera for each gene were aggregated into phyla (or classes for the Proteobacteria).