Table 1.

Coordinates, depth and sampling dates of the sampling localities

Country	Sampling Site	Latitude	Longitude	Minimum depth (in meters)	Maximum depth (in meters)	Sampling period
Greece	Alykes	35.41461	24.98816	0	0.5	09/2007 and 06/2008
Greece	Elounda	35.26125	25.75178	0	0.5	09/2007 and 05/2009
Greece	Evripos channel (St. 1a)	38.46432	23.5917	0	0.2	09/1997-10/1997
Greece	Evripos channel (St. 1b)	38.46342	23.59038	0	0.2	09/1997-10/1997
Greece	Evripos channel (St. 1c)	38.46302	23.58922	0	0.2	09/1997-10/1997
Greece	Thermaikos Gulf (St.2a)	40.46238	22.85345	0	0.2	09/1997-10/1997
Greece	Thermaikos Gulf (St.2b)	40.50664	22.9078	0	0.2	09/1997-10/1997
Greece	Thermaikos Gulf (St.2c)	40.59685	22.94731	0	0.2	09/1997-10/1997
Greece	Nea Roda	40.38238	23.93882	0	1.5	09/1997-10/1997
Greece	Porto Karas	40.07488	23.79555	0	0.3	09/1997-10/1997
Greece	Porto Lagos	41.00581	25.11961	0	0.2	09/1997-10/1997
Italy	Balestrate	38.05072	12.99988	0	0.3	1989 (spring, summer, autumn, winter)
Italy	Zingaro	38.09721	12.8027	0	0.3	1984 (spring)
Italy	Capo Gallo	38.21174	13.28836	0	0.3	1986 (spring, autumn, winter)