Table 2.

Frequency of operational taxonomic units (OTUs) identified by 16S rDNA-analysis of the metagenomic samples.

Metagenomic sample	Kingdom	OTUs with highest similarity to phylum (e.g., most predominant families)	Number of sequences (frequency)
Hot springs (water/sediments)	Archaea	Crenarchaeota (Sulfolobaceae, Stygiolobus azoricus DSM 6296 only)	5 (100.0%)
	Bacteria	Proteobacteria (Enterobacteriaceae, Methylobacteriaceae, Acetobacteraceae, Sphingomonadaceae, Burkholderiaceae, Acidithiobacillaceae)	19 (82.6%)
		Bacteriodetes (Flavobacteriaceae)	2 (8.7%)
		Others (Cyanobacteria)	2 (8.7%)
Compost (lumber waste)	Bacteria	Firmicutes (Bacillaceae, Thermoanaerobacteriaceae, Alicyclobacillaceae, Paenibacillaceae, Clostridiaceae)	208 (88.1%)
		Actinobacteria (Streptosporangiaceae)	17 (7.2%)
		Proteobacteria (Enterobacteriaceae, Rhodobacteraceae Pseudomonadaceae, Myxococcaceae)	8 (3.4%)
		Others (Chloroflexi, Actinobacteria)	3 (1.3%)