Table 1. Oligonucleotide probes used in Card-FISH for this study.

Probe	Sequence (5′ to 3′) of probe	Specificity	Source
NON-Eub338	ACA TCC TAC GGG AGG C	Negative Control	(Wallner et al., 1993)
Eub338	GCT GCC TCC CGT AGG AGT	Domain Bacteria	(Amann et al., 1990)
Alk	CG ACG CGA GCT CAT CCA TCA	Alcanivorax genus	(Karner and Fuhrman, 1997)