Environmental impactOur data make possible the chemometric evaluation of the accumulative abilities ofSaduria entomonas a candidate for biomonitoring of heavy metals in the southern Baltic Sea. The isopod is one of the sentinel organisms recommended by HELCOM for evaluating the state of the marine environment. Chemometric analysis indicates that several external environmental conditions, among others, the granulometric composition of the sediment, make an important contribution to the discrimination of isopod populations inhabiting two regions, namely open Baltic waters and the Gulf of Gdansk which is more exposed to anthropogenic factors. It appears that this is the first study concerning multivariate assessment of bioaccumulation of heavy metals inSaduria entomonwith respect to the concentration of their labile forms in the associated sediments as substrata.