Data on the sex and age composition of Bramblings Fringilla montifringilla during autumn migration and winter in Europe

Abstract

Bramblings Fringilla montifringilla are known to vary in winter distribution according to sex and age (differential migration). This pattern is complicated by the large yearly fluctuation in their preferred winter food, beech seeds. In beechmast areas, large concentrations of Bramblings occur, and their sex and age composition differs from that of winters without a beechmast. Here we present data on the sex and age composition of Bramblings during autumn migration and winters with and without beechmast, mainly from Switzerland, supplemented with data from northern and southern Europe.

Literature cited in the Excel-file

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