Vácha Martin, Půzová Tereza, Drstková Dana
Department of Animal Physiology and Immunology, Faculty of Science, Masaryk University, Kotlárská 2, 611 37, Brno, Czech Republic.
J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2008 Oct;194(10):853-9. doi: 10.1007/s00359-008-0356-9. Epub 2008 Aug 12.
In many animal species, geomagnetic compass sensitivity has been demonstrated to depend on spectral composition of light to which moving animals are exposed. Besides a loss of magnetic orientation, cases of a shift in the compass direction by 90 degrees following a change in the colour of light have also been described. This hitherto unclear phenomenon can be explained either as a change in motivation or as a side effect of a light-dependent reception mechanism. Among the invertebrates, the 90 degrees shift has only been described in Drosophila. In this paper, another evidence of the phenomenon is reported. Learned compass orientation in the Tenebrio molitor was tested. If animals were trained to remember the magnetic position of a source of shortwave UV light and then tested in a circular arena in diffuse light of the same wavelength, they oriented according to the learned magnetic direction. If, however, they were tested in blue-green light after UV light training, their magnetic orientation shifted by 90 degrees CW. This result is being discussed as one of a few cases of 90 degrees shift reported to date, and as an argument corroborating the hypothesis of a close connection between photoreception and magnetoreception in insects.
在许多动物物种中，已证明地磁罗盘敏感性取决于活动动物所接触的光的光谱组成。除了磁定向丧失外，还描述了在光的颜色变化后罗盘方向发生90度偏移的情况。这种迄今尚不清楚的现象既可以解释为动机的变化，也可以解释为光依赖接收机制的副作用。在无脊椎动物中，90度偏移仅在果蝇中被描述过。本文报道了该现象的另一个证据。对黄粉虫的习得罗盘定向进行了测试。如果动物被训练记住短波紫外光源的磁位置，并随后在相同波长的漫射光下的圆形竞技场中进行测试，它们会根据习得的磁方向进行定向。然而，如果在紫外光训练后在蓝绿光下对它们进行测试，它们的磁定向会顺时针偏移90度。这一结果被作为迄今为止报道的少数90度偏移案例之一进行讨论，并作为支持昆虫光感受与磁感受之间存在紧密联系这一假设的论据。
