Show simple item record

dc.contributor.authorGjelland, Karl Øystein
dc.contributor.authorBøhn, Thomas
dc.contributor.authorHorne, John K.
dc.contributor.authorJensvoll, Ingrid
dc.contributor.authorKnudsen, Frank Reier
dc.contributor.authorAmundsen, Per-Arne
dc.date.accessioned2020-08-25T22:01:32Z
dc.date.available2020-08-25T22:01:32Z
dc.date.issued2009-03-20
dc.description.abstractVisually foraging planktivorous fish are prey of visual predators, and their foraging behaviour may be affected by light levels both in terms of gain and risk. The large seasonal change in day length throughout a subarctic summer at 69°N was used to show the influence of light on diel vertical migration (DVM) and shoaling patterns in a planktivorous fish assemblage consisting of two species (<i>Coregonus lavaretus</i> and <i>Coregonus albula</i>). Under the midnight sun in June, night and daytime behaviour was similar, with extensive shoaling and limited DVM. With increasingly darker nights towards autumn, the fish dispersed during the dark hours and showed more extensive DVM. Throughout the changing light regime of both the day and the season, the planktivores consistently chose depths with light levels compatible with visual foraging and reduced predation risk as revealed from reactive distance modelling of coregonids and their salmonid predators. The findings support the hypothesis that behavioural decisions are based on a trade-off between foraging rate and predation risk, and increased predator avoidance behaviour towards autumn suggests that this trade-off is state-dependent.en_US
dc.identifier.citationGjelland, K.O., Bøhn, T., Horne, J., Jensvoll, I., Knudsen, F.R. & Amundsen, P.-A. (2009). Planktivore vertical migration and shoaling under a subarctic light regime. <i>Canadian Journal of Fisheries and Aquatic Sciences., 66</i>(4), 525-539.en_US
dc.identifier.cristinIDFRIDAID 352488
dc.identifier.doi10.1139/F09-014
dc.identifier.issn0706-652X
dc.identifier.issn1205-7533
dc.identifier.urihttps://hdl.handle.net/10037/19155
dc.language.isoengen_US
dc.publisherCanadian Science Publishingen_US
dc.relation.journalCanadian Journal of Fisheries and Aquatic Sciences
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2009 Canadian Science Publishingen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.titlePlanktivore vertical migration and shoaling under a subarctic light regimeen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record