Lars Dehe's research while affiliated with Goethe-Universität Frankfurt am Main and other places
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Publications (3)
When magnetic compass orientation of migratory robins was tested, the birds proved well oriented under low intensity monochromatic light of shorter wavelengths up to 565nm green; from 583nm yellow onward, they were disoriented. In the present study, we tested robins under bichromatic lights composed (1) of 424nm blue and 565nm green and (2) of 565n...
Under 502 nm turquoise light combined with 590 nm yellow light and in total darkness, European robins, Erithacus rubecula, no longer prefer their migratory direction, but exhibit so-called fixed direction responses that do not show the seasonal change between spring and autumn. We tested robins under these light conditions in the local geomagnetic...
Citations
... The GMF is a natural component of the biosphere. During evolution, all organisms experienced the presence of the GMF, and some organisms evolved the ability to use magnetic fields (MF) during migration [39] or for orientation [40]. In plants, the mechanism of magnetoreception has been inferred for both the radical pair mechanism (RPM) of chemical magnetosensing and the MagR/Cry biocompass [15,41]. ...
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... Zebra finches trained and tested under the high-intensity RF field at the Larmor frequency with only minor harmonics (RF 1.4 high ; Fig. 3, Table S4) were significantly oriented, but in a direction shifted by 128° relative to the magnetic compass direction in which they received the food reward during training (Fig. 3A) The oriented response of birds exposed to RF 1.4 high (with harmonic intensities less than 1/1000 th of the intensity at the Larmor frequency) during both training and testing suggests that the magnetic modulation pattern may have been qualitatively altered, but still provided the birds with directional magnetic compass information relative to which they can orient. Since the distribution of bearings relative to mN (i.e., any untrained magnetic component of the responses) of the group of birds trained and tested under RF 1.4 high is not significant (P = 0.577; Table S4), it is unlikely that the unimodal orientation is comparable to the 'fixed' magnetic responses reported in migratory birds 56 . ...
