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Orientation Responses of Ring-Billed Gull Chicks: A Re-Evaluation

  • William E. Southern
Part of the Proceedings in Life Sciences book series (LIFE SCIENCES)

Abstract

The mean bearing for Ring-Billed Gull chicks tested in orientation cages correlates favorably with the direction in which they will head to reach the winter range. Previous studies indicated that geomagnetic cues alone were of importance in this process. Reanalysis of data from 3 500 trials has shown that under some conditions (1) directional shifts rather than disorientation may occur, and that (2) solar cues may be used as a supplemental source of information. Severe magnetic disturbance usually results in disorientation, regardless of sky conditions. Changes in apparatus design may significantly influence results, and this problem must be entertained during data interpretation.

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References

  1. Southern, W.E.: Orientation behavior of Ring-Billed Gull chicks and fledglings. Condor 71, 418–425 (1969)CrossRefGoogle Scholar
  2. Southern, W.E.: Gull orientation by magnetic cues: a hypothesis revisited. Ann. N.Y. Acad. Sci. 188, 295–311 (1971)PubMedCrossRefGoogle Scholar
  3. Southern, W.E.: Influence of disturbances in the Earth’s magnetic field on Ring-Billed Gull orientation. Condor 74, 102–105 (1972)CrossRefGoogle Scholar
  4. Southern, W.E.: Seasonal distribution of Great Lakes Region Ring-Billed Gulls. Jack-Pine Warbler 52, 154–179 (1974a)Google Scholar
  5. Southern, W.E.: The effects of superimposed magnetic fields on gull orientation. Wilson Bull. 86, 256–271 (1974b)Google Scholar
  6. Southern, W.E.: Migrational orientation in Ring-Billed Gull chicks. Auk 93, 78–85 (1976)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1978

Authors and Affiliations

  • William E. Southern
    • 1
    • 2
  1. 1.Department of Biological SciencesNorthern Illinois UniversityDeKalbUSA
  2. 2.The University of MichiganBiological StationPellstonUSA

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