Table 4.

Predicted percent activity based on 16S rRNA gene data.

	Epsilonproteobacteria			Gammaproteobacteria
Site	Total OTUsa	Active OTUsb	% Active	Total OTUsa	Active OTUsb	% Active
Gollum	94	0	0	25	18	72
Marker 33	79	0	0	39	35	89.7
Marker 113	41	17	41.5	13	13	100
Pompeii	47	0	0	14	10	71.4
Escargot	61	2	3.3	18	11	61.1
9m	37	3	8.1	19	9	47.4

^aNumber of OTUs that occur >0.1% of all sequences in either RNA or DNA fraction.

^bNumber of OTUs that were scored as active if the RNA relative recovery was greater than its recovery from DNA.