Antioxidant defence barrier of great tit Parus major nestlings in response to trace elements.

It is quite significant that invertebrates, which are one of the major sources of the birds’ food, are particularly exposed to heavy metals (Carpene et al. 2006 ; Roodbergen et al. 2008 ), and thus, birds are very sensitive to changes occurring in the structure of the environment (Savard et al. 2000 ).

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