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A behavioral perspective on the biophysics of the light-dependent magnetic compass: a link between directional and spatial perception?

Författare:
Publiceringsår: 2010
Språk: Engelska
Sidor: 3247-3255
Publikation/Tidskrift/Serie: Journal of Experimental Biology
Volym: 213
Nummer: 19
Dokumenttyp: Artikel
Förlag: Company of Biologists Ltd

Sammanfattning

In terrestrial organisms, sensitivity to the Earth's magnetic field is mediated by at least two different magnetoreception mechanisms, one involving biogenic ferromagnetic crystals (magnetite/maghemite) and the second involving a photo-induced biochemical reaction that forms long-lasting, spin-coordinated, radical pair intermediates. In some vertebrate groups (amphibians and birds), both mechanisms are present; a light-dependent mechanism provides a directional sense or 'compass', and a non-light-dependent mechanism underlies a geographical-position sense or 'map'. Evidence that both magnetite-and radical pair-based mechanisms are present in the same organisms raises a number of interesting questions. Why has natural selection produced magnetic sensors utilizing two distinct biophysical mechanisms? And, in particular, why has natural selection produced a compass mechanism based on a light-dependent radical pair mechanism (RPM) when a magnetite-based receptor is well suited to perform this function? Answers to these questions depend, to a large degree, on how the properties of the RPM, viewed from a neuroethological rather than a biophysical perspective, differ from those of a magnetite-based magnetic compass. The RPM is expected to produce a light-dependent, 3-D pattern of response that is axially symmetrical and, in some groups of animals, may be perceived as a pattern of light intensity and/or color superimposed on the visual surroundings. We suggest that the light-dependent magnetic compass may serve not only as a source of directional information but also provide a spherical coordinate system that helps to interface metrics of distance, direction and spatial position.

Disputation

Nyckelord

  • Biology and Life Sciences
  • place cells
  • subicular
  • spatial cognition
  • magnetic compass
  • radical pair mechanism

Övriga

Published
Yes
  • ISSN: 0022-0949

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