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dc.contributor.authorBories, Pierre
dc.contributor.authorRikardsen, Audun H.
dc.contributor.authorLeonards, Pim
dc.contributor.authorFisk, Aaron T.
dc.contributor.authorTartu, Sabrina
dc.contributor.authorVogel, Emma
dc.contributor.authorBytingsvik, Jenny
dc.contributor.authorBlévin, Pierre
dc.date.accessioned2021-08-23T11:29:00Z
dc.date.available2021-08-23T11:29:00Z
dc.date.issued2021-05-01
dc.description.abstractIn cetaceans, blubber is the primary and largest lipid body reservoir. Our current understanding about lipid stores and uses in cetaceans is still limited, and most studies only focused on a single narrow snapshot of the lipidome. We documented an extended lipidomic fingerprint in two cetacean species present in northern Norway during wintertime. We were able to detect 817 molecular lipid species in blubber of killer whales (Orcinus orca) and humpback whales (Megaptera novaeangliae). The profiles were largely dominated by triradylglycerols in both species and, to a lesser extent, by other constituents including glycerophosphocholines, phosphosphingolipids, glycerophosphoethanolamines, and diradylglycerols. Through a unique combination of traditional statistical approaches, together with a novel bioinformatic tool (LION/web), we showed contrasting fingerprint composition between species. The higher content of triradylglycerols in humpback whales is necessary to fuel their upcoming half a year fasting and energy-demanding migration between feeding and breeding grounds. In adipocytes, we assume that the intense feeding rate of humpback whales prior to migration translates into an important accumulation of triacylglycerol content in lipid droplets. Upstream, the endoplasmic reticulum is operating at full capacity to supply acute lipid storage, consistent with the reported enrichment of glycerophosphocholines in humpback whales, major components of the endoplasmic reticulum. There was also an enrichment of membrane components, which translates into higher sphingolipid content in the lipidome of killer whales, potentially as a structural adaptation for their higher hydrodynamic performance. Finally, the presence of both lipid-enriched and lipid-depleted individuals within the killer whale population in Norway suggests dietary specialization, consistent with significant differences in δ15N and δ13C isotopic ratios in skin between the two groups, with higher values and a wider niche for the lipid-enriched individuals. Results suggest the lipid-depleted killer whales were herring specialists, while the lipid-enriched individuals might feed on both herrings and seals.en_US
dc.identifier.citationBories, Rikardsen, Leonards, Fisk, Tartu, Vogel E, Bytingsvik, Blévin. A deep dive into fat: Investigating blubber lipidomic fingerprint of killer whales and humpback whales in northern Norway. Ecology and Evolution. 2021;11(11):6716-6729en_US
dc.identifier.cristinIDFRIDAID 1926910
dc.identifier.doi10.1002/ece3.7523
dc.identifier.issn2045-7758
dc.identifier.urihttps://hdl.handle.net/10037/22212
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalEcology and Evolution
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.titleA deep dive into fat: Investigating blubber lipidomic fingerprint of killer whales and humpback whales in northern Norwayen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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