Within-winter movements: a common phenomenon in the Common Pochard Aythya ferina

Abstract

Waterbirds are often observed to move between different wintering sites within the same winter—for example, in response to food availability or weather conditions. Within-winter movements may contribute to the spreading of diseases, such as avian influenza, outside the actual migration period. The Common Pochard Aythya ferina seems to be particularly… (More)
DOI: 10.1007/s10336-008-0367-x

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