PCB AND SIGMA-DDT CONTAMINATION IN EGGS OF THE SELECTED BIRD SPECIES IN THE PODUNAJSKA-NIZINA LOWLAND (SLOVAKIA)

The level of PCBs and SIGMADDT in the eggs of five free living species of birds from the Podunajska nizina lowland was analysed by gas chrom atography. Each analysed sample of eggs of Pica pica (34 eggs), Corvus frugilegus (49 eggs), Turdus merula (17 eggs) Turdus philomelos (16 e ggs) and Fulica atra (31 eggs) contained residua of PCB and SIGMADDT. Except for Fulica atra, the average level of SIGMADDT was higher than that of PCBs. In Turdus merula, the PCB level was higher in the earlie r clutches than in the later ones. In Pica pica this relation was also observed in the SIGMADDT level. In Turdus philomelos this relation wa s observed also in the SIGMADDT level. In Turdus philomelos this relat ion was observed also in the SIGMADDT level. In Turdus philomelos this relation was not confirmed.