Fig. 3

Box and Whisker plots indicating the range of occurrence of the most common macro-Crustacea (in terms of number of sites where the species was encountered) observed along the Belgian coastal harbours based on the chemical water parameters salinity, ammonium, nitrite, total phosphorous, dissolved oxygen and nitrate. Alien species are underlined (Gt Gammarus tigrinus, Gl Gammarus locusta, Gd Gammarus duebeni, Dv Dikerogammarus villosus, Gc Gammarus crinicornis, Ca Corophium acherusicum, Mp Melita palmata, Jm Jassa marmorata, Mg Microdeutopus gryllotalpa, Cm Caprella mutica, Cl Caprella linearis, Cma Carcinus maenas, Hp Hemigrapsus penicillatus, Rh Rhitropanopeus harrisii, Ps Palaemon serratus, Pl Palaemon longirostris, Pv Palaemonetes varians, Cc Crangon crangon, Ni Neomysis integer, Aa Asellus aquaticus, Lh Lekanesphaera hookeri)