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Magnetite-based magnetoreception.

J L Kirschvink1, M M Walker, C E Diebel

  • 1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA. Kirschvink@Caltech.edu

Current Opinion in Neurobiology
|August 15, 2001
PubMed
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Organisms use magnetoreception for orientation and navigation, relying on specialized sensory systems. The authors propose that tiny magnetite crystals form the basis of this magnetic sense across diverse species.

Area of Science:

  • Biology
  • Biophysics
  • Sensory Ecology

Background:

  • Orientation, navigation, and homing are vital survival traits in organisms.
  • Sensory systems supporting these behaviors are highly evolved over billions of years.
  • Magnetoreception, the ability to sense magnetic fields, is a key example of such an evolved sense.

Purpose of the Study:

  • To review the evidence for magnetite-based magnetoreception across diverse organisms.
  • To propose a unified hypothesis for the physical basis of magnetic field sensitivity in life.
  • To emphasize the role of single-domain magnetite crystals in biological magnetic senses.

Main Methods:

  • Literature review of studies on magnetoreception.
  • Analysis of evidence implicating magnetite (Fe3O4) in magnetic sense.

Related Experiment Videos

  • Synthesis of findings across different taxa, from bacteria to vertebrates.

    • Main Results:

    • Compelling evidence suggests single-domain magnetite crystals are the physical basis for magnetoreception in many species.
    • Magnetite's ferromagnetic properties are consistent with a biological magnetic sensor.
    • This mechanism is proposed to be conserved and finely tuned across a wide range of organisms.

    Conclusions:

    • All magnetic field sensitivity in organisms is likely based on highly evolved sensory systems.
    • These systems utilize single-domain, ferromagnetic magnetite crystals.
    • This provides a unified explanation for magnetoreception across the animal kingdom.