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Tests were carried out on the levels of cadmium, copper, iron and zinc in selected organs (liver, kidneys and spleen) of bank voles (Clethrionomys glareolus, Schreber, 1780) caught in autumn 1998 and 1999 in a number of forests situated at varying distances east and south of Kraków. All the results were compared with the levels of these metals present in voles caught from a control area of Borecka Forest. Cadmium content was determined with a graphite tray, using a Perkin Elmer AAnalyst 800 atomic absorption spectrophotometer, after wet digestion of samples in a mixture of inorganic acids (HNO3 : HClO4). The concentrations of physiological elements (Cu, Fe, and Zn) were analyzed using the flame method of an IL-251 atomic absorption spectrophotometer. The levels of heavy metals present depended on the organ being tested and the area in which the rodents were caught. The relationships between the content of these elements and the age and sex of the animals were also observed.
Pb and Cd concentrations in the livers in the relation to the development and mortality of Passer domesticus and P. montanus nestlings in urban parks of Warsaw and suburban villages were studied. Pb concentrations in the livers of both species were higher in sick and dead nestlings than in healthy ones. The proportion of sick and dead nestlings was increased in the classes of Pb concentration higher than 2 µg·g⁻¹ of dry weight. The mean deviations of the body weights of healthy and sick nestlings from the model weight were lowest at Pb concentrations in the liver less than 2 µg·g⁻¹ of dry weight. No significant differences were found in Cd concentrations in the livers of healthy, sick and dead nestlings. Proportions of these categories of nestlings in different classes of Cd concentrations were similar.
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