Behavioral Ecology and Sociobiology

, Volume 58, Issue 4, pp 361–365 | Cite as

Magnetic compass mediates nocturnal homing by the alpine newt, Triturus alpestris

  • Francisco J. Diego-Rasilla
  • Rosa M. Luengo
  • John B. Phillips
Original Article

Abstract

Experiments were carried out to investigate the use of magnetic compass cues in the nocturnal homing orientation of the alpine newt Triturus alpestris. Tests were carried out at a site 9 km to the east–northeast of the breeding pond. Newts were tested at night in an outdoor circular arena that provided an unimpeded view of celestial cues, in one of four symmetrical alignments of an earth-strength magnetic field. In tests carried out under partly cloudy skies newts exhibited homeward magnetic compass orientation. Because the moon was visible in some trials, but obscured by clouds in others, we investigated whether the presence of the moon contributed to the scatter in the distribution of magnetic bearings. When the moon was visible, the distribution of magnetic bearings was more scattered than when the moon was obscured by clouds, although in neither case was the distribution significant due, in part, to the small sample sizes. Moreover, when the moon was visible, newts oriented along a bimodal axis perpendicular to the moon azimuth, suggesting that the presence of the moon may have affected the newts behavior. To provide a more rigorous test of the role of magnetic compass cues when celestial cues were unavailable, nocturnal tests were carried out during the following migratory season under total overcast. In the absence of celestial compass cues, the distribution of magnetic bearings exhibited highly significant orientation in the homeward direction. These findings indicate that newts are able to orient in the homeward direction at night using the magnetic compass as the sole source of directional information. Moon light altered the newts’ behavior. However, this apparently resulted from the asymmetrical distribution of moon light in the testing arena, rather than the use of an alternative compass.

Keywords

Celestial cues Homing Magnetoreception Newt Orientation Triturus 

Notes

Acknowledgements

We sincerely thank Marcos Diego-Gutiérrez for invaluable assistance during this study. The Cantabria autonomous government kindly granted the necessary permits for the study. We are particularly indebted to F. J. Manrique, director of the Natural Park of Saja-Besaya, for permitting the study to be carried out at the Natural Park. The experiments reported herein comply with the current laws of Spain

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Francisco J. Diego-Rasilla
    • 1
  • Rosa M. Luengo
    • 2
  • John B. Phillips
    • 3
  1. 1.Departamento de Biología AnimalUniversidad de SalamancaSalamancaSpain
  2. 2.Departamento de Prevención y MedioambienteSalamancaSpain
  3. 3.Biology DepartmentVirginia TechBlacksburgUSA

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