Abstract
Fe, Mn, Ni, Cu, Zn, Cd and Pb concentrations were determined in the gills of Anodonta piscinalis (Nilss.). The collected animals had wide size (body weight) range, and about half of them carried glochidia. The influences of size and glochidia bearing on metal concentration were examined. It was suspected that a similar mechanism (e.g. ‘growth dilution’) must control Fe, Mn and Zn concentrations in gills, but the mechanisms for the other metals is more complex. Although a simultaneous elimination procedure for the effects of glochidia presence and the body weight dependence was outlined, a general mechanistic normalization procedure has not been found. Therefore, in some cases removing the clams bearing glochidia is the only way to eliminate the effect of glochidia bearing from monitoring surveys, when mussel gill is used as a ‘monitor organ’.
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