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1 Polish Journal of Ecology

1 2012

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Timing of autumn migration and biometric characteristics of migrating populations of european Robin (Erithacus rubicola L. 1958) in north-eastern Poland

Polakowski M., Jankowiak Ł.

Polish Journal of Ecology

2012

Vol. 60, nr 4

797--804

We studied the autumn migration of the European robin (Erithacus rubecula) through north-eastern Poland. During the study period 2002–2004 we analysed a total of 2375 individuals: 1991 first-year birds and 349 adults. First-year birds had shorter wings than adults. Body condition was influenced by age, year of migration fat content and arrival time. Our results show that first-year birds arrived earlier, had low-fat levels and were in a comparatively poorer body condition to that of the adults and were less effective foragers. Stopover length decreased during the migration season for both age groups as a result of rush to their wintering areas because of winter approach. We found that adult females arrived later than adult males.