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Journal of Experimental Biology, Vol 188, Issue 1 275-291, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
J Phillips and S Borland
Laboratory experiments were carried out to investigate the effects of varying the wavelength of light on the use of an earth-strength magnetic field for shoreward orientation and for the compass component of homing. In the earlier shoreward orientation experiments, newts tested under full-spectrum and short-wavelength (i.e. 400 and 450 nm) light exhibited shoreward magnetic compass orientation. Under long-wavelength (i.e. 550 and 600 nm) light, newts exhibited magnetic compass orientation that was rotated 90 ° counterclockwise to the shoreward direction. This wavelength-dependent shift in magnetic compass orientation was shown to be due to a direct effect of light on the underlying magnetoreception mechanism. In homing experiments, newts tested under full-spectrum and short-wavelength light exhibited homeward magnetic compass orientation. Under long-wavelength light, newts were randomly distributed with respect to the magnetic field. The different effects of long-wavelength light on shoreward orientation and homing confirmed earlier evidence that different magnetoreception systems mediate these two forms of orientation behaviour. The properties of the newt's homing response are consistent with the use of a hybrid magnetoreception system receiving inputs from the light-dependent magnetic compass and from a non-light-dependent intensity (or inclination) detector which, unlike the compass, is sensitive to the polarity of the magnetic field.
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  R. C. Beason Mechanisms of Magnetic Orientation in Birds Integr. Comp. Biol., June 1, 2005; 45(3): 565 - 573. [Abstract] [Full Text] [PDF]
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 J. B. Phillips, S. C. Borland, M. J. Freake, J. Brassart, and J. L. Kirschvink `Fixed-axis' magnetic orientation by an amphibian: non-shoreward-directed compass orientation, misdirected homing or positioning a magnetite-based map detector in a consistent alignment relative to the magnetic field? J. Exp. Biol., December 15, 2002; 205(24): 3903 - 3914. [Abstract] [Full Text] [PDF]
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J. B. Phillips, M. E. Deutschlander, M. J. Freake, and S. C. Borland The role of extraocular photoreceptors in newt magnetic compass orientation: parallels between light-dependent magnetoreception and polarized light detection in vertebrates J. Exp. Biol., March 9, 2002; 204(14): 2543 - 2552. [Abstract] [Full Text] [PDF]
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W. Wiltschko and R. Wiltschko Light-dependent magnetoreception in birds: the behaviour of European robins, Erithacus rubecula, under monochromatic light of various wavelengths and intensities J. Exp. Biol., January 10, 2001; 204(19): 3295 - 3302. [Abstract] [Full Text] [PDF]
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J Brassart, J. Kirschvink, J. Phillips, and S. Borland Ferromagnetic material in the eastern red-spotted newt notophthalmus viridescens J. Exp. Biol., January 11, 1999; 202(22): 3155 - 3160. [Abstract] [PDF]
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M. Deutschlander, J. Phillips, and S. Borland The case for light-dependent magnetic orientation in animals J. Exp. Biol., January 4, 1999; 202(8): 891 - 908. [Abstract] [PDF]
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