Radiofrequency magnetic fields disrupt magnetoreception in American cockroach.
| Authors | |
|---|---|
| Year of publication | 2009 |
| Type | Article in Periodical |
| Magazine / Source | Journal of Experimental Biology |
| MU Faculty or unit | |
| Citation | |
| Field | Physiology |
| Keywords | Magnetoreception Insects Radical-Pair Radio frequency Cryptochrome |
| Description | The sense that allows the birds to orient themselves by the Earth's magnetic field can be disabled by an oscillating magnetic field whose intensity is just a fraction of the geomagnetic field intensity and whose oscillations fall into the medium or high frequency radio wave bands. This remarkable phenomenon points very clearly at one of two existing alternative magnetoreception mechanisms in terrestrial animals, i.e. the mechanism based on the radical pair reactions of specific photosensitive molecules. As the first such study in invertebrates, our work offers evidence that geomagnetic field reception in American cockroach is sensitive to a weak radiofrequency field. Furthermore, we show that the deafening effect at Larmor frequency 1.2 MHz is stronger than at different frequencies. The parameter studied was the rise in locomotor activity of cockroaches induced by periodic changes in the geomagnetic North positions by 60. The onset of the disruptive effect of 1.2 MHz field was found between 12 nT and 18 nT while the threshold of doubled frequency field 2.4 MHz fell between 18 and 44 nT. 7 MHz field showed no impact even in maximal 44 nT magnetic flux density. The results indicate resonance effects rather than non-specific bias of procedure itself and suggest that insects may be equipped with the same magnetoreception system as the birds. |
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