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dc.contributor.authorSzetey, Aylah
dc.contributor.authorWright, Daniel William
dc.contributor.authorOppedal, Frode
dc.contributor.authorDempster, Timothy David
dc.date.accessioned2022-03-07T14:24:28Z
dc.date.available2022-03-07T14:24:28Z
dc.date.created2022-02-11T14:24:55Z
dc.date.issued2021
dc.identifier.issn1869-215X
dc.identifier.urihttps://hdl.handle.net/11250/2983526
dc.description.abstractLight is a fundamental environmental cue which influences the migration of many marine organisms. For the salmon louse Lepeophtheirus salmonis, light is believed to drive the diel vertical migration behaviour of their planktonic larvae. Salmon lice are of critical importance to the salmonid industry due to the damage they cause to wild and farmed hosts. Salmon lice larvae have an eyespot and are positively phototactic, yet how light intensity alters their vertical distribution remains unclear. Here, we tested how light intensity (0, 0.5, 10 and 80 µmol m-2 s-1), dispersal duration (1, 4 and 12 h) and release point (surface or bottom) influenced the vertical migration of salmon lice nauplii and copepodids under controlled conditions in experimental columns. Overall, higher light intensity increased the proportion of nauplii that aggregated at the surface. Copepodid behaviour differed from that of nauplii, as they swam upwards in both light and fully dark conditions, and surface aggregations increased with dispersal duration. Results from the experiments did not support the existing view that light strongly influences the vertical position of copepodids in the water column. Combined with previous work, our results reveal that salmon lice larval stages display different vertical responses to light, temperature and salinity, which may be explained by the different strategies of nauplii (maximise survival and dispersal) and copepodids (maximise host-finding success). Our results have implications for salmon lice dispersal models, where responses of copepodids and nauplii to light are currently parametrised by the same equations. Implementing stage-specific behaviours towards light may improve the outputs of dispersal models.en_US
dc.language.isoengen_US
dc.titleSalmon lice nauplii and copepodids display different vertical migration patterns in response to lighten_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.journalAquaculture Environment Interactionsen_US
dc.identifier.doi10.3354/aei00396
dc.identifier.cristin2000578
dc.relation.projectFiskeri- og havbruksnæringens forskningsfinansiering: 901283en_US
dc.relation.projectHavforskningsinstituttet: 14880en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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