Table 1.

Coordinates, locality, sampling type (seawater and/or sediment) and number of samples for the operational observatories sampling sites.

Observatory	Coordinates	Ocean/Sea	Region	Location	Marine Ecoregion of the World (MEOW)	Seawater sampling	Sediment sampling	Total Number of samples in this batch	Number of successfully sequenced samples
AAOT	45.31417N; 12.508333E	Mediterranean Sea - Eastern Basin	Adriatic Sea	Gulf of Venice	Adriatic Sea	Yes		8	8
BPNS	51.43333N; 2.808331E	North Atlantic Ocean	North Sea	Belgian part of the North Sea	North Sea	Yes	Yes	12	12
EMT21	42.20194N; -8.798500W	Atlantic Ocean	North Atlantic Ocean	Vigo Seamount	South European Atlantic Shelf	Yes		8	8
ESC68N	68.92589N; 17.125619E	Arctic Ocean	Norwegian Sea	Norwegian part of the Norwegian Sea	Northern Norway and Finnmark	Yes		8	2
IUIEilat	29.50000N; 34.916667E	Indian Ocean	Gulf of Eilat	Gulf of Eilat	Northern and Central Red Sea	Yes		8	8
NRMCB	40.80014N; 14.250000E	Mediterranean Sea - Western Basin	Tyrrhenian Sea	Naples Gulf	Western Mediterranean	Yes	Yes	8	12
OOB	42.489N; 3.143E	Mediterranean Sea - Western Basin	Gulf of Lion	Bay of Banyuls-sur-Mer	Western Mediterranean		Yes	4	2
OSD74	41.14653N; -8.666639W	Atlantic Ocean	North Atlantic Ocean	Porto Valley	South European Atlantic Shelf	Yes		8	8
PiEGetxo	43.33858N; -3.014639W	North Atlantic Ocean	Bay of Biscay	Abra de Bilbao	South European Atlantic Shelf	Yes		8	8
RFormosa	37.00564N; -7.969250W	Atlantic Ocean	North Atlantic Ocean	Ria Formosa	South European Atlantic Shelf	Yes	Yes	12	12
ROSKOGO	48.70833N; -3.866000W	North Atlantic Ocean	English Channel	French part of the English Channel	Celtic Seas		Yes	4	4
ROSKOGO	48.77167N; -3.968333W	North Atlantic Ocean	English Channel	French part of the English Channel	Celtic Seas	Yes		8	8
VB	43.68300N; 7.317000E	Mediterranean Sea - Western Basin	Villefranche Bay	Villefranche Bay - Point B	Western Mediterranean	Yes		8	8
MBAL4	50.25N; -4.217W	North Atlantic Ocean	English Channel	Western Channel	Celtic Seas	Yes		8	8