Table 1. Details of the sampling sites where the viral metagenomes have been collected in the Atlantic Ocean and the Mediterranean Sea.

Parameter	Atlantic Ocean	Mediterranean Sea
Sampling date	5 May 2008	4 October 2003
Sample volume	130 L	500 L
Latitude	1.19° N	37.18° N
Longitude	12.96° W	14.98° E
Depth	5200 m	2400 m
Salinity	34.844	38.400
Temperature	2.04°C	13.10°C
Prokaryotic abundance	1.9×104 mL−1	3.6×104 mL−1
Viral abundance	4.6×105 mL−1	9.1×105 mL−1