Tidal and circadian patterns of European eel during their spawning migration in the North Sea and the English Channel

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Fältnamn	Indikatorer	Metadata
000		02985naa a2200289 4500
001		oai:slubar.slu.se:128649
003		SwePub
008		240410s2023 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://res.slu.se/id/publ/1286492 URI
024	7	a https://doi.org/10.1016/j.scitotenv.2023.1673412 DOI
040		a (SwePub)slu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Westerberg, Håkanu Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources4 aut0 (Swepub:slu)47394
245	1 0	a Tidal and circadian patterns of European eel during their spawning migration in the North Sea and the English Channel
264	1	c 2023
264	1	b Elsevier,c 2024
520		a Technological advances in tracking methods enable the mapping of anguillid eel migration routes from continental habitats to their spawning sites in the ocean. However, the behaviour and orientation abilities of anguillids are still poorly understood, and have only rarely been studied on the continental shelf. Here we present the results of a study into the vertical and horizontal movement behaviour of 42 European eels (Anguilla anguilla L.) tagged with electronic tags that migrated through the North Sea and English Channel towards and into the Atlantic Ocean during their spawning migration. We used actograms, periodograms and linear mixed effects models to determine the periodicity and significance of the timing and pattern of vertical movement and activity. Overall, eels had a complex behavioural repertoire that included classical diel vertical migration (DVM), reverse DVM and vertical movement behaviours that synchronized with tidal patterns. All of the eels that were tracked showed one or more of these behaviours during their time at liberty, and many exhibited all of them. We also observed that the eels had a higher horizontal migration speed when the current in the favourable direction was stronger. This, together with the vertical movement synchronized with the tides, suggests the eels adopt selective tidal stream transport. Finally, tracked eels had a higher vertical movement range at night compared to daytime. We hypothesize that these behaviours are driven by bio-energetic efficient movement, navigation and predator avoidance.
650	7	a LANTBRUKSVETENSKAPERx Lantbruksvetenskap, skogsbruk och fiskex Fisk- och akvakulturforskning0 (SwePub)401072 hsv//swe
650	7	a AGRICULTURAL SCIENCESx Agriculture, Forestry and Fisheriesx Fish and Aquacultural Science0 (SwePub)401072 hsv//eng
710	2	a Sveriges lantbruksuniversitetb Institutionen för akvatiska resurser4 org
710	2	a Sveriges lantbruksuniversitet
773	0	t Science of the Total Environmentg 905q 905x 0048-9697x 1879-1026
856	4 8	u https://res.slu.se/id/publ/128649
856	4 8	u https://doi.org/10.1016/j.scitotenv.2023.167341

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