Ants(Formicinae.Hymenoptera)are considered efficient accumulators of Zn and Cd.In this study the relationship between Cd concentrations in soil and in Lasius niger workers was assessed for 20 colonies located along a gradient of Cd pollution.As soil Cd concentration increased from 1 to 8 mg/kg.ant body Cd concentration increased rapidly to about 40mg/kg,andremained stable atthislevel,through a progressive increase of soil Cd concentration from 8 to 21 mg/kg.The phase of rapid increase confirms the high ability of L niger for Cd accumulation.while the stabilization of Cd body concentration indicates either increasing elimination rate or decreasing rate of uptake.Therefore it Can be concluded that Lasius niger has a high ability to accumulate Cd,but simultaneously an ability for Cd regulation was detected.
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