Abstract
ecosystems. In a previous paper (BALUJA and HERNANDEZ, in press) results were reported on levels of organochorine residues in muscle, liver, kidney, brain, and gonad in species of purple heron (Ardea purpurea) and spoon duck (Anas clypeata) collected in the Biological Reserve of Doflana (South-West of Spa�8 The purpose of this paper �8 to give new data on the levels of organochlorine pesticides and PCB residues in eggs of birds from the South-West of Spain, mainly the natural Reserve of Dofiana, with the aire of finding if there exists some class of incidence of the organo- chlorine residues on the lire of wildbirds living in that area whose populations appear to be declining lately,
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