caa a22 4500 463175328 CHVBK 20180406164824.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10336-007-0233-2 doi (NATIONALLICENCE)springer-10.1007/s10336-007-0233-2 Magnetoreception in birds: two receptors for two different tasks [Elektronische Daten] [Wolfgang Wiltschko, Roswitha Wiltschko] Birds can use the geomagnetic field as a source of navigational information in different ways: the magnetic vector provides a compass; magnetic intensity and/or inclination play a role as a component of the navigational ‘map', and magnetic conditions of certain regions act as ‘sign posts' or triggers, eliciting specific responses. Two hypotheses on magnetoreception are currently under discussion. One proposes a chemical compass based on a radical pair mechanism involving direction-dependent reactions in specialized photopigments; the other postulates processes involving iron-rich particles, such as magnetite. Behavioral evidence suggests that birds use both mechanisms, with radical pair processes in the right eye providing directional information and an iron-based mechanism in the upper beak providing information on position as a component of the navigational ‘map'. Electrophysiological data support this view. The interactions of the two mechanisms, however, are still poorly understood. Dt. Ornithologen-Gesellschaft e.V., 2007 Avian navigation nationallicence Magnetic compass nationallicence Magnetite nationallicence Magnetoreception nationallicence Radical pair model nationallicence Wiltschko Wolfgang FB Biowissenschaften, J.W.Goethe-Universität Frankfurt, Siesmayerstr. 70, 60054, Frankfurt am Main, Germany aut Wiltschko Roswitha FB Biowissenschaften, J.W.Goethe-Universität Frankfurt, Siesmayerstr. 70, 60054, Frankfurt am Main, Germany aut Journal of Ornithology Springer-Verlag 148(2007-12-01), 61-76 0021-8375 148<61 2007 148 10336 https://doi.org/10.1007/s10336-007-0233-2 text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10336-007-0233-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wiltschko Wolfgang FB Biowissenschaften, J.W.Goethe-Universität Frankfurt, Siesmayerstr. 70, 60054, Frankfurt am Main, Germany aut NATIONALLICENCE 700 1- Wiltschko Roswitha FB Biowissenschaften, J.W.Goethe-Universität Frankfurt, Siesmayerstr. 70, 60054, Frankfurt am Main, Germany aut NATIONALLICENCE 773 0- Journal of Ornithology Springer-Verlag 148(2007-12-01), 61-76 0021-8375 148<61 2007 148 10336 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer