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Resonance effects indicate a radical-pair mechanism for avian magnetic compass

机译：共振效应表明禽类磁罗盘具有自由基对机制

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Migratory birds are known to use the geomagnetic field as a source of compass information(1,2). There are two competing hypotheses for the primary process underlying the avian magnetic compass, one involving magnetite(3-5), the other a magnetically sensitive chemical reaction(6-8). Here we show that oscillating magnetic fields disrupt the magnetic orientation behaviour of migratory birds. Robins were disoriented when exposed to a vertically aligned broadband (0.1 - 10 MHz) or a single-frequency (7-MHz) field in addition to the geomagnetic field. Moreover, in the 7-MHz oscillating field, this effect depended on the angle between the oscillating and the geomagnetic fields. The birds exhibited seasonally appropriate migratory orientation when the oscillating field was parallel to the geomagnetic field, but were disoriented when it was presented at a 24degrees or 48degrees angle. These results are consistent with a resonance effect on singlet - triplet transitions and suggest a magnetic compass based on a radical-pair mechanism(7,8).
机译：已知候鸟使用地磁场作为指南针信息的来源（1,2）。鸟类磁罗盘的主要过程有两个相互竞争的假设，一个涉及磁铁矿（3-5），另一个涉及磁敏感的化学反应（6-8）。在这里，我们证明了振荡磁场会破坏候鸟的磁取向行为。罗宾斯在暴露于垂直磁场的宽带（0.1-10 MHz）或除地磁场之外的单频（7 MHz）磁场中时会迷失方向。此外，在7 MHz的振荡场中，这种效应取决于振荡场与地磁场之间的夹角。当振荡场与地磁场平行时，这些禽类表现出季节性的适度迁徙方向，但是当其以24度或48度角出现时，它们会迷失方向。这些结果与对单重态-三重态跃迁的共振效应相一致，并提出了基于自由基对机制的磁罗盘（7,8）。

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