Small birds fly at high altitudes towards Africa – University of Copenhagen

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04 October 2018

Small birds fly at high altitudes towards Africa

High flying

A new study from Center for Macroecology, Evolution and Climate, University of Copenhagen and Lund University, shows that small birds migrating from Scandinavia to Africa in the autumn occasionally fly as high as 4 000 metres above sea level - probably adjusting their flight to take advantage of favourable winds and different wind layers.

(By Lund University)

This is the first time that researchers have tracked how high small birds fly all the way from Sweden to Africa. Previous studies have successfully logged the flight height of larger migratory birds., Postdoc Sissel Sjöberg, Lund University and Center for Macroecology, Evolution and Climate, University of Copenhagen, says ,

“We only followed two individuals and two species. But the fact that both of them flew so high does surprise me. It’s fascinating and it raises new questions about the physiology of birds. How do they cope with the air pressure, thin air and low temperatures at these heights?


The aim of the study was to investigate whether the measuring method itself works on small birds, that is, to measure acceleration, barometric pressure (air pressure) and temperature throughout the flight using a small data logger attached to the bird.

The red-backed shrike (Photo: Thomas Alerstam)

The data logger was attached to two individuals of different species: the great reed warbler and the red-backed shrike. Among other things, the results show how long it takes for each bird to fly to their destination. The measured barometric pressure showed that the great reed warbler occasionally flies at 3 950 metres, and the red-backed shrike flies at 3 650 metres.

Both individuals flew the highest above ground across the Mediterranean Sea and the Sahara, but the shrike reached higher flight altitudes closer to its winter grounds in southern Africa.

Sissel Sjöberg thinks it is likely that other small birds fly as high, maybe even higher. But there is no evidence of that yet.

“In this study, we only worked with data collected during the autumn, when the small birds migrate to Africa. There are other studies that indicate that the birds fly even higher when they migrate back in the spring, but we cannot say for sure

The small transmitter was developed by technicians at the Centre for Animal Movement Research, CanMove, at Lund University. The study published in the Journal of Avian Biology is a collaboration between Lund University, the University of Copenhagen and the Nature Research Centre in Vilnius.

Publication:
Barometer logging reveals new dimensions of individual songbird migration

Contact:
Postdoc Sissel Sjöberg
(+46) 70 781 14 68
ssjoberg@snm.ku.dk