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Journal of Comparative Physiology A

, Volume 202, Issue 12, pp 869–877 | Cite as

Mathematical analysis of the homing flights of pigeons based on GPS tracks

  • Ingo SchiffnerEmail author
  • Susanne Denzau
  • Dennis Gehring
  • Roswitha Wiltschko
Original Paper

Abstract

To analyse the effect of magnetic and olfactory deprivation on the homing flight of pigeons, we released birds from a familiar site with either their upper beak or their nostrils anaesthetized. The tracks were analysed by time lag embedding to calculate the short-term correlation dimension, a variable that reflects the degrees of freedom and thus the number of factors involved in a system. We found that higher natural fluctuations in the earth’s magnetic field characterized by A P-indices of 8 and above caused a reduction of the correlation dimension of the control birds. We thus separated the data into two groups according to whether they were recorded on magnetically quiet days or on days with higher magnetic fluctuations. Anaesthetizing the upper beak had no significant effect. Making pigeons anosmic reduced the correlation dimension on magnetically quiet days, but did not cause any reduction on days with higher fluctuations. Altogether, our data suggest an involvement of magnetic cues and olfactory factors during the homing flight and point to a robust, multi-factorial map.

Keywords

Homing pigeons Magnetic navigation Olfactory input Correlation dimension GPS tracks 

Notes

Acknowledgments

The Ap-indices were provided by the National Oceanic and Atmospheric Administration (Boulder, Colorado). The experiments were performed in accordance with the rules and regulations of animal welfare in Germany.

Compliance with ethical standards

Conflict of interest

The authors declare no competing financial interests.

Funding

Our work was supported by the Deutsche Forschungsgemeinschaft (WI 988/7-2, grant to R.W).

Supplementary material

359_2016_1127_MOESM1_ESM.doc (32 kb)
Supplementary material 1 (DOC 31 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Ingo Schiffner
    • 1
    • 2
    Email author
  • Susanne Denzau
    • 2
  • Dennis Gehring
    • 2
  • Roswitha Wiltschko
    • 2
  1. 1.Queensland Brain InstituteUniversity of QueenslandSt. LuciaAustralia
  2. 2.Fachbereich BiowissenschaftenGoethe-Universität FrankfurtFrankfurt am MainGermany

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