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Glass eels (Anguilla anguilla) imprint the magnetic direction of tidal currents from their juvenile estuaries

Cresci, Alessandro; Durif, Caroline; Paris, Claire B.; Shema, Steven D.; Skiftesvik, Anne Berit; Browman, Howard
Journal article, Peer reviewed
Published version
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URI
http://hdl.handle.net/11250/2644788
Date
2019
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Original version
Communications Biology. 2019, 2 (1), 1-8.   10.1038/s42003-019-0619-8
Abstract
The European eel (Anguilla anguilla) hatches in the Sargasso Sea and migrates to European and North African freshwater. As glass eels, they reach estuaries where they become pigmented. Glass eels use a tidal phase-dependent magnetic compass for orientation, but whether their magnetic direction is innate or imprinted during migration is unknown. We tested the hypothesis that glass eels imprint their tidal-dependent magnetic compass direction at the estuaries where they recruit. We collected 222 glass eels from estuaries flowing in different cardinal directions in Austevoll, Norway. We observed the orientation of the glass eels in a magnetic laboratory where the magnetic North was rotated. Glass eels oriented towards the magnetic direction of the prevailing tidal current occurring at their recruitment estuary. Glass eels use their magnetic compass to memorize the magnetic direction of tidal flows. This mechanism could help them to maintain their position in an estuary and to migrate upstream.
Journal
Communications Biology

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