Table 1.

Oligonucleotide probes used for FISH in this study.

Target Microorganism	Probe	Sequence (5′–3′)	FA (%)	Reference
Alphaproteobacteria	ALF1b	CGTTCGYTCTGAGCCAG	20	Manz et al.38
	ALF968	GGTAAGGTTCTGCGCGTT	20	Neef39
Betaproteobacteria	Bet42a	GCCTTCCCACTTCGTTT	35	Manz et al.38
	Bet42a competitor	GCCTTCCCACATCGTTT
Gammaproteobacteria	Gam42a	GCCTTCCCACATCGTTT	35	Manz et al.38
	Gam42a competitor	GGTAAGGTTCTGCGCGTT
Thauera spp.	THAU832	TGCATTGCTGCTCCGAAC	30	Loy et al.35, Ricardo et al.36