| Light-dependent magnetic compass in Iberian green frog tadpoles. | |
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MedLine Citation:
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PMID: 20978882 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Here, we provide evidence for a wavelength-dependent effect of light on magnetic compass orientation in Pelophylax perezi (order Anura), similar to that observed in Rana catesbeiana (order Anura) and Notophthalmus viridescens (order Urodela), and confirm for the first time in an anuran amphibian that a 90° shift in the direction of magnetic compass orientation under long-wavelength light (≥ 500 nm) is due to a direct effect of light on the underlying magnetoreception mechanism. Although magnetic compass orientation in other animals (e.g., birds and some insects) has been shown to be influenced by the wavelength and/or intensity of light, these two amphibian orders are the only taxa for which there is direct evidence that the magnetic compass is light-dependent. The remarkable similarities in the light-dependent magnetic compasses of anurans and urodeles, which have evolved as separate clades for at least 250 million years, suggest that the light-dependent magnetoreception mechanism is likely to have evolved in the common ancestor of the Lissamphibia (Early Permian, ~294 million years) and, possibly, much earlier. Also, we discuss a number of similarities between the functional properties of the light-dependent magnetic compass in amphibians and blue light-dependent responses to magnetic stimuli in Drosophila melanogaster, which suggest that the wavelength-dependent 90° shift in amphibians may be due to light activation of different redox forms of a cryptochrome photopigment. Finally, we relate these findings to earlier studies showing that the pineal organ of newts is the site of the light-dependent magnetic compass and recent neurophysiological evidence showing magnetic field sensitivity in the frog frontal organ (an outgrowth of the pineal). |
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Authors:
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Francisco Javier Diego-Rasilla; Rosa Milagros Luengo; John B Phillips |
Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-10-27 |
Journal Detail:
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Title: Die Naturwissenschaften Volume: 97 ISSN: 1432-1904 ISO Abbreviation: Naturwissenschaften Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-11-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0400767 Medline TA: Naturwissenschaften Country: Germany |
Other Details:
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Languages: eng Pagination: 1077-88 Citation Subset: IM |
Affiliation:
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Departamento de Biología Animal, Universidad de Salamanca, Campus Miguel de Unamuno, Edificio de Farmacia 5ª planta, 37007, Salamanca, Spain. fjdiego@herpetologica.org |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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