Magnetite-based magnetoreception in birds: the effect of a biasing field and a pulse on migratory behaviour

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dc.contributor.author Wiltschko, Wolfgang en_US
dc.contributor.author Munro, Ursula en_US
dc.contributor.author Wiltschko, Roswitha en_US
dc.contributor.author Kirschvink, Joseph en_US
dc.date.accessioned 2009-12-21T03:52:04Z
dc.date.available 2009-12-21T03:52:04Z
dc.date.issued 2002 en_US
dc.identifier 2004003055 en_US
dc.identifier.citation Wiltschko Wolfgang et al. 2002, 'Magnetite-based magnetoreception in birds: the effect of a biasing field and a pulse on migratory behaviour', Company of Biologists Ltd, vol. 205, no. N/A, pp. 3031-3037. en_US
dc.identifier.issn 0022-0949 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/5733
dc.description.abstract To test the hypothesis that single domain magnetite is involved in magnetoreception, we treated Australian silvereyes Zosterops l. lateralis with a strong, brief pulse designed to alter the magnetization of single domain particles. This pulse was administered in the presence of a 1 mT biasing field, either parallel to the direction of the biasing field (PAR group) or antiparallel (ANTI group). In the case of magnetoreceptors based on freely moving single domain particles, the PAR treatment should have little effect, whereas the ANTI treatment should cause remagnetization of the magnetite particles involved in a receptor and could produce a maximum change in that receptor's output for some receptor configurations. Migratory orientation was used as a criterion to assess the effect on the receptor. Before treatment, both groups preferred their normal northerly migratory direction. Exposure to the biasing field alone did not affect their behavior. Treatment with the pulse in the presence of the biasing field caused both the PAR and the ANTI birds to show an axial preference for the east west axis, with no difference between the two groups. Although these results are in accordance with magnetite-based magnetoreceptors playing a role in migratory orientation, they do not support the hypothesis that single domains in polarity-sensitive receptors are free to move through all solid angles. Possible interpretations, including other arrangements of single domains and superparamagnetic crystals, are discussed. en_US
dc.publisher Company of Biologists Ltd en_US
dc.relation.isbasedon http://jeb.biologists.org/cgi/content/abstract/205/19/3031 en_US
dc.title Magnetite-based magnetoreception in birds: the effect of a biasing field and a pulse on migratory behaviour en_US
dc.parent Journal of Experimental Biology en_US
dc.journal.volume 205 en_US
dc.journal.number en_US
dc.journal.number N/A en_US
dc.publocation Cambridge, United Kingdom en_US
dc.identifier.startpage 3031 en_US
dc.identifier.endpage 3037 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 060201 en_US
dc.personcode 0000017852 en_US
dc.personcode 960091 en_US
dc.personcode 0000020258 en_US
dc.personcode 0000023508 en_US
dc.percentage 40 en_US
dc.classification.name Behavioural Ecology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords magnetoreception, single domain magnetite, superparamagnetic particles, pulse, biasing field, migratory orientation, Zosterops l. lateralis, Australian silvereye en_US


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