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Magnetic compass orientation research with migratory songbirds at Stensoffa Ecological Field Station in southern Sweden : why is it so difficult to obtain seasonally appropriate orientation?

Author:
  • Rachel Muheim
  • Susanne Åkesson
  • Johan Bäckman
  • Sissel Sjöberg
Publishing year: 2017-01-01
Language: English
Pages: 6-18
Publication/Series: Journal of Avian Biology
Volume: 48
Issue: 1
Document type: Journal article review
Publisher: Federation of European Neuroscience Societies and Blackwell Publishing Ltd

Abstract english

More than three decades ago, Thomas Alerstam initiated the study of orientation and navigation of migratory songbirds in southern Sweden. Stensoffa Ecological Field Station, located approx. 20 km east of Lund, has since been a primary location for orientation experiments. However, it has often been difficult to record well-oriented behaviour in the seasonal appropriate migratory directions, in particular in magnetic orientation experiments under simulated overcast or indoors. Here, we summarise all available experiments testing magnetic compass orientation in migratory songbirds in southern Sweden, and review possible explanations for the poor magnetic compass orientation found in many studies. Most of the factors proposed can be essentially excluded, such as difficulties to extract magnetic compass information at high latitudes, methodological or experimenter biases, holding duration and repeated testing of individual birds, effects of magnetic anomalies and temporal variations of the ambient magnetic field, as well as anthropogenic electromagnetic disturbances. Possibly, the geographic location of southern Sweden where many birds captured and/or tested at coastal sites are confronted with the sea, might explain some of the variation that we see in the orientation behaviour of birds. Still, further investigations are needed to conclusively identify the factors responsible for why birds are not better oriented in the seasonal appropriate migratory direction at Stensoffa.

Keywords

  • Ecology

Other

Published
  • Lund Vision Group
  • ISSN: 0908-8857
Rachel Muheim
E-mail: rachel.muheim [at] biol.lu.se

Researcher

Functional zoology

+46 46 222 31 93

B-B314

4

Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden