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Eighty cormorants from the area of Ostroda and Mrągowo were used for this study. The analyses were carried out between 1993-1996. Each year 10 two-year-old birds were shot (5 females and 5 males) in two nesting grounds. On average, the amount of concentrated DDT in cormorant liver fat was 4.914 mg/kg and y-HCH was 0.039 mg/kg of wet mass. The average amount of DDT in subsequent years varied and ranged...
Badania przeprowadzono na 48 kaczkach krzyżówkach (Anas platyrhynchos) w wieki 4-5 miesięcy w latach 1993-1995. Ptaki pochodziły z dwóch różnych środowisk: z uprzemysłowionego obszaru (teren miejski w pobliżu Bydgoszczy) i intensywnie uprawianego obszaru rolniczego (okolica w pobliżu Żnina, gdzie prowadzono uprawę pól). W czasie trzyletniego okresu badań obserwowano u kaczek krzyżówek pochodźących...
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