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  • 1
    Electronic Resource
    Electronic Resource
    A magnetic pulse leads to a temporary deflection in the orientation of migratory birds (1994)
    Springer
    Cellular and molecular life sciences 50 (1994), S. 697-700 
    Details
    ISSN: 1420-9071
    Keywords: Bird migration ; orientation ; magnetic field ; magnetite ; magnetoreception ; Silvereye ; Zosterops l. lateralis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Migratory Australian Silvereyes were treated with a strong magnetic pulse designed to alter the magnetization of the small magnetite particles that are found in birds' heads. Prior to the treatment, the birds preferred the northeasterly migratory direction. The pulse initially resulted in a 90° clockwise shift of orientation; however, within about a week, the birds seemed to return to their original headings. These findings, which seem to suggest an involvement of magnetite in migratory orientation, are in contrast with previous findings which indicated that it is a light-dependent process. They are discussed in view of the current concepts on magnetoreception and on the role of magnetic information in avian orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952877
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic inclination compass: A basis for the migratory orientation of birds in the Northern and Southern Hemisphere (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 167-170 
    Details
    ISSN: 1420-9071
    Keywords: Bird migration ; southern hemisphere migrants ; migratory orientation ; geomagnetic field ; magnetic compass ; inclination compass ; Zosterops
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We conducted orientation experiments with Silvereyes,Zosterops lateralis, Australian passerine migrants, to see whether birds living in the Southern Hemisphere in a magnetic field with an upward inclination orient in the same way as birds in the Northern Hemisphere that experience a downward inclination of the magnetic field. Tested indoors in the local geomagnetic field, the birds preferred southerly directions corresponding to their migratory direction in spring. In a magnetic field with a reversed vertical component, they reversed their directional tendencies. This shows that the magnetic compass of Silvereyes also functions as an inclination compass based on the inclination of the field lines instead of the polarity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01989423
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    Paper (German National Licenses)
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