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dc.contributor.authorBengtsson, Oskar
dc.contributor.authorLydersen, Christian
dc.contributor.authorChristensen, Guttorm
dc.contributor.authorWęsławski, Jan Marcin
dc.contributor.authorKovacs, Kit M.
dc.date.accessioned2023-10-13T11:58:50Z
dc.date.available2023-10-13T11:58:50Z
dc.date.issued2023-09-22
dc.description.abstractDuring summer, native anadromous Arctic char (Salvelinus alpinus) and the alien species pink salmon (Oncorhynchus gorbuscha) now coexist in marine environments in Svalbard, following the introduction of the latter in the Barents Region. To investigate potential dietary competition between these two salmonid species, stomach contents from Arctic char (n=301) and pink salmon (n=28) were sampled from diferent areas within the archipelago. The most important prey in terms of biomass for both salmonid species were amphipods; Themisto libellula (B=26.0%) for Arctic char and Onisimus litoralis (B=35.0%) for pink salmon. Pianka’s niche overlap revealed that dietary overlap between the two species was moderately high (O<sub>obs</sub>=0.59); both species had strong associations with intertidal invertebrates in areas where direct comparisons were possible (Kongs orden/Kross orden). However, both salmonid species did also eat some fish, with Arctic char consuming more ofshore pelagic fish, while the small number of fish eaten by pink salmon were primarily coastal demersal fish species. Arctic char was a more generalist feeder, while pink salmon was more of a dietary specialist. Furthermore, the diet composition of the Arctic char consisted of 32.9% Atlantic prey while the pink salmon, surprisingly, ate only Arctic species, likely due to their tightly coastal feeding habits. Even though the sample size for pink salmon was low, this study contributes new insights into salmonid diets in Svalbard and the potential for introduced species to compete with native Arctic endemics, particularly in the expected warmer Arctic of the future.en_US
dc.identifier.citationBengtsson, Lydersen, Christensen, Węsławski, Kovacs. Marine diets of anadromous Arctic char (Salvelinus alpinus) and pink salmon (Oncorhynchus gorbuscha) in Svalbard, Norway. Polar Biology. 2023en_US
dc.identifier.cristinIDFRIDAID 2182095
dc.identifier.doi10.1007/s00300-023-03196-8
dc.identifier.issn0722-4060
dc.identifier.issn1432-2056
dc.identifier.urihttps://hdl.handle.net/10037/31548
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.relation.journalPolar Biology
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleMarine diets of anadromous Arctic char (Salvelinus alpinus) and pink salmon (Oncorhynchus gorbuscha) in Svalbard, Norwayen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution 4.0 International (CC BY 4.0)