Table 1.

Comparison among the abundances of viruses extracted from sediments by means of the WB and PC procedures (before the step for concentrating viruses using vacuum filtration or TFF treatment) and the procedure developed for viral counting²¹. All data are expressed as 10⁸ virus g⁻¹. n.a = not available.

	PC procedure	WB procedure	Procedure for viral counting
NE Atlantic 1	4.95 ± 0.643	0.0239 ± 0.012	6.86 ± 0.685
NE Atlantic 2	6.86 ± 1.14	n.a.	9.59 ± 0.923
Mediterranean	3.65 ± 0.305	0.0374 ± 0.0137	4.75 ± 0.397

All data are expressed as 10⁸ virus g⁻¹. n.a = not available.