PIGEON HOMING: EFFECTS OF MAGNETIC PULSES ON INITIAL ORIENTATION

After treatment with a 0.5-T magnetic pulse, homing pigeons (Columbia livia) showed headings that deviated from the mean direction of untreated controls. These de- flections ranged up to 60 o and were most pronounced at distances beyond 100 km from the home loft. When birds treated with a pulse south-anterior and birds treated with south-left were released together, they deviated to opposite sides of the untreated controls, indicating that the direction of the pulse determined its specific effects. On the day of treatment, a south-left pulse caused a significantly larger deflection than a south-anterior pulse. The du- ration of the effects was not entirely clear; the number of releases with significant deflections seemed to decrease as time passed and birds had made additional homing flights. Our find- ings agree with the hypothesis that magnetite-based receptors provide the pigeons with or- ientational information. The manifestations of the effect indicate that the magnetic "map" rather than the magnetic compass is involved. Apparently, the pulse specifically alters map information. Received 24 September 1996, accepted 30 January 1997.

[1]  R. Wiltschko,et al.  Evidence for a Magnetite-Based Navigational “Map” in Birds , 1997, Naturwissenschaften.

[2]  Beason,et al.  Does the avian ophthalmic nerve carry magnetic navigational information? , 1996, The Journal of experimental biology.

[3]  Wolfgang Wiltschko,et al.  Red light disrupts magnetic orientation of migratory birds , 1993, Nature.

[4]  R. Beason,et al.  Responses to small magnetic variations by the trigeminal system of the bobolink , 1990, Brain Research Bulletin.

[5]  P. Ioalé,et al.  Pigeon homing: effects of magnetic disturbances before release on initial orientation , 1989 .

[6]  W. Wiltschko,et al.  The orientation behaviour of anosmic pigeons in Frankfurt a.M., Germany , 1987, Animal Behaviour.

[7]  R. Beason,et al.  Magnetic responses of the trigeminal nerve system of the bobolink (Dolichonyx oryzivorus) , 1987, Neuroscience Letters.

[8]  R. Beason,et al.  Natural and Induced Magnetization in the Bobolink, Dolichonyx Oryzivorus (Aves: Icteridae) , 1986 .

[9]  P. Ioalé,et al.  Methods for Producing Disturbances in Pigeon Homing Behaviour by Oscillating Magnetic Fields , 1985 .

[10]  R. Beason,et al.  Magnetic orientation and magnetically sensitive material in a transequatorial migratory bird , 1984, Nature.

[11]  M. Kusunoki,et al.  Magnetic Remanences in Migratory Birds , 1982 .

[12]  Klaus Schulten,et al.  Magnetic Field Effects in Chemistry and Biology , 1982 .

[13]  W. Wiltschko,et al.  Disorientation of inexperienced young pigeons after transportation in total darkness , 1981, Nature.

[14]  E. Yorke.  Sensitivity of pigeons to small magnetic field variations. , 1981, Journal of theoretical biology.

[15]  J. L. Gould,et al.  Pigeons have magnets. , 1979, Science.

[16]  E. Visalberghi,et al.  MAGNETIC INFLUENCES ON PIGEON HOMING , 1979 .

[17]  E D Yorke,et al.  A possible magnetic transducer in birds. , 1979, Journal of theoretical biology.

[18]  J. L. Gould,et al.  Bees Have Magnetic Remanence , 1978, Science.

[19]  C. Walcott.  MAGNETIC FIELDS AND THE ORIENTATION OF HOMING PIGEONS UNDER SUN , 1977 .

[20]  M. Leask,et al.  A physicochemical mechanism for magnetic field detection by migratory birds and homing pigeons , 1977, Nature.

[21]  A. Perdeck,et al.  Two Types of Orientation in Migrating Starlings, Sturnus yulgaris L., and Chaffinches, Fringilla coelebs L., as Revealed by Displacement Experiments , 1958 .

[22]  Frank C. Whitmore,et al.  A Preliminary Study of a Physical Basis of Bird Navigation , 1947 .

[23]  Beason,et al.  Behavioural evidence for the use of magnetic material in magnetoreception by a migratory bird , 1995, The Journal of experimental biology.

[24]  Dr. Roswitha Wiltschko,et al.  Magnetic Orientation in Animals , 1995, Zoophysiology.

[25]  R. Wiltschko,et al.  Avian Orientation: Multiple Sensory Cues and the Advantage of Redundancy , 1994 .

[26]  H. H. Edwards,et al.  Natural and Induced Remanent Magnetism in Birds , 1992 .

[27]  J. L. Gould,et al.  Homing of magnetized and demagnetized pigeons. , 1988, The Journal of experimental biology.

[28]  Wolfgang Wiltschko,et al.  Cognitive Maps and Navigation in Homing Pigeons , 1987 .

[29]  G. Maret,et al.  The Effect of Ultrahigh Magnetic Fields on the Initial Orientation of Homing Pigeons , 1986 .

[30]  N. E. Baldaccini,et al.  Homing behaviour of pigeons released after having been placed in an alternating magnetic field , 1983 .

[31]  Joseph L. Kirschvink,et al.  Biogenic Ferrimagnetism: A New Biomagnetism , 1983 .

[32]  Charles Walcott,et al.  A Search for Magnetic Field Receptors in Animals , 1982 .

[33]  E. Batschelet.  Circular statistics in biology , 1981 .

[34]  J. L. Gould,et al.  Biogenic magnetite as a basis for magnetic field detection in animals. , 1981, Bio Systems.

[35]  H. G. Wallraff.  Das Navigationssystem der Vögel: Ein theoretischer Beitrag zur Analyse ungeklärter Orientierungsleistungen , 1974 .