Abstract
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° 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° 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° CW. This result is being discussed as one of a few cases of 90° shift reported to date, and as an argument corroborating the hypothesis of a close connection between photoreception and magnetoreception in insects.
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Acknowledgments
This research was supported by a grant from the Czech Science Foundation (GACR 206/07/J041, 206/05/0911) and from the Ministry of Education, Youth and Sports (MSM 0021622416). The research was conducted according to all applicable laws of animal welfare.
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Vácha, M., Půžová, T. & Drštková, D. Effect of light wavelength spectrum on magnetic compass orientation in Tenebrio molitor . J Comp Physiol A 194, 853–859 (2008). https://doi.org/10.1007/s00359-008-0356-9
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DOI: https://doi.org/10.1007/s00359-008-0356-9