[1] Univ So Denmark, Inst Biol, DK-5230 Odense M, Denmark
[2] Minist Agr Nat Resources & Environm, Dept Fisheries & Marine Res, Marine Environm Div, CY-1416 Nicosia, Cyprus
[3] Aarhus Univ, Natl Environm Res Inst, Dept Marine Ecol, DK-8600 Silkeborg, Denmark
[4] Polytech Univ Marche, Dept Marine Sci, I-60131 Ancona, Italy
[5] IMEDEA CSIC UIB, Esporles 07190, Illes Balears, Spain
[6] Conselleria Agr & Pesca, Direccio Gen Pesca, Palma de Mallorca 07006, Illes Balears, Spain
[7] Univ Crete, Dept Biol, Marine Ecol Lab, Iraklion 71409, Crete, Greece
[8] CNR, Inst Marine Coastal Environm, I-98122 Messina, Italy
[9] Univ Barcelona, Dept Ecol, E-08028 Barcelona, Spain
[10] Hellen Ctr Marine Res, Inst Oceanog, Iraklion 71003, Crete, Greece