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Timing of autumn migration and biometric characteristics of migrating populations of European Robin (Erithacus rubecula L., 1958) in North-Eastern Poland

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Polakowski M., Jankowiak L.

Polish Journal of Ecology

2012

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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.

Relation between stopover length and time and body parameters of European Robin Erithacus rubecula [L., 1758] during autumn migration [Central Poland]

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Polak M., Szewczyk P.

Polish Journal of Ecology

2007

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The relation between age, body parameters and the stopover behaviour of a small, short-distance, migratory bird during the season of autumn (August–October) was studied. Capture-recapture data of 1018 first-year and 89 adult European Robins migrating through central Poland (“Kaliszany” ringing station, 21°48’E, 51°05’N) in autumn between 1997 and 2005 were analysed. Body mass, length of wing and tail of young Robins caught and stayed at the stopover site showed significant seasonal variation. Immature Robins made longer stopovers (median = 4 days, 1–41) in the area than older ones (median = 3 days, 1–32). The stopover duration decreased continuously during the season. However, body mass changes at the staging site was not related to the age of birds. The birds migrating in the second half of autumn (late September–October) period accumulated fat faster than birds migrating in the early season. Our analyses confirmed that late migrants stayed for shorter stopovers and gained more body mass than early migrating birds due to a shift in migration strategy as an adaptation to time stress.

Ograniczanie wyników

2 Polish Journal of Ecology

1 Jankowiak L.

1 Polak M.

1 Polakowski M.

1 Szewczyk P.

1 2012

1 2007

Wyniki wyszukiwania

Timing of autumn migration and biometric characteristics of migrating populations of European Robin (Erithacus rubecula L., 1958) in North-Eastern Poland

Relation between stopover length and time and body parameters of European Robin Erithacus rubecula [L., 1758] during autumn migration [Central Poland]