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dc.contributor.authorNordøy, Erling Sverre
dc.contributor.authorLager, Anne Regine
dc.contributor.authorSchots, Pauke C.
dc.date.accessioned2018-11-08T16:20:04Z
dc.date.available2018-11-08T16:20:04Z
dc.date.issued2017-11-29
dc.description.abstractThe aim of this study was to monitor seasonal changes in stable isotopes of pool freshwater and harp seal (Phoca groenlandica) body water, and to study whether these potential seasonal changes might bias results obtained using the doubly labelled water (DLW) method when measuring energy expenditure in animals with access to freshwater. Seasonal changes in the background levels of deuterium and oxygen-18 in the body water of four captive harp seals and in the freshwater pool in which they were kept were measured over a time period of 1 year. The seals were offered daily amounts of capelin and kept under a seasonal photoperiod of 69°N. Large seasonal variations of deuterium and oxygen-18 in the pool water were measured, and the isotope abundance in the body water showed similar seasonal changes to the pool water. This shows that the seals were continuously equilibrating with the surrounding water as a result of significant daily water drinking. Variations in background levels of deuterium and oxygen-18 in freshwater sources may be due to seasonal changes in physical processes such as precipitation and evaporation that cause fractionation of isotopes. Rapid and abrupt changes in the background levels of deuterium and oxygen-18 may complicate calculation of energy expenditure by use of the DLW method. It is therefore strongly recommended that analysis of seasonal changes in background levels of isotopes is performed before the DLW method is applied on (free-ranging) animals, and to use a control group in order to correct for changes in background levels.en_US
dc.description.sponsorshipPubliseringsforndet UiT Norges arktiske universitet: ?en_US
dc.descriptionSource at <a href=https://doi.org/10.1242/jeb.161943> https://doi.org/10.1242/jeb.161943 </a>en_US
dc.identifier.citationNordøy, E. S., Lager, A. R. & Schots, P. C. (2017). Seasonal changes in background levels of deuterium and oxygen- 18 prove water drinking by harp seals, which affects the use of the doubly labelled water method. <i>Journal of Experimental Biology</i>, 220, 4450-4455. https://doi.org/10.1242/jeb.161943en_US
dc.identifier.cristinIDFRIDAID 1531794
dc.identifier.doi10.1242/jeb.161943
dc.identifier.issn0022-0949
dc.identifier.issn1477-9145
dc.identifier.urihttps://hdl.handle.net/10037/14143
dc.language.isoengen_US
dc.publisherThe Company of Biologists Ltden_US
dc.relation.journalJournal of Experimental Biology
dc.relation.projectIDNorges forskningsråd: ?en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Medisinske Fag: 700::Basale medisinske, odontologiske og veterinærmedisinske fag: 710::Medisinsk biokjemi: 726en_US
dc.subjectVDP::Medical disciplines: 700::Basic medical, dental and veterinary science disciplines: 710::Medical biochemistry: 726en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.titleSeasonal changes in background levels of deuterium and oxygen- 18 prove water drinking by harp seals, which affects the use of the doubly labelled water methoden_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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