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dc.contributor.authorSørlie, Maria
dc.contributor.authorNilssen, Kjell Tormod
dc.contributor.authorBjørge, Arne Jostein
dc.contributor.authorBrandt, Carla Freitas
dc.date.accessioned2020-10-14T11:42:32Z
dc.date.available2020-10-14T11:42:32Z
dc.date.created2020-08-02T13:14:04Z
dc.date.issued2020
dc.identifier.citationMarine Biology Research. 2020, 16 (4), 1-13.en_US
dc.identifier.issn1745-1000
dc.identifier.urihttps://hdl.handle.net/11250/2682796
dc.description.abstractTo explore ecosystem dynamics and functions it is vital to obtain knowledge on predator–prey relations. Harbour seals are piscivorous predators that can come into conflict with fisheries. Recently, as the Skagerrak and Kattegat population of harbour seals has increased, claims have emerged that seals are depleting coastal cod populations. The diet of harbour seals in Norwegian Skagerrak was investigated based on otolith identification from scats. The overall seal diet included 20 different fish species/groups. The most important prey (combined index Q i ) were haddock/pollack/saithe (32.7%), genus Trisopterus (Norway pout/poor cod/bib, 12.5%), plaice (12.4%) and herring (10.0%). Plaice also had the largest biomass (24.1%). Gadoids and pleuronectids comprised 88.6% of the diet (combined index Q i ) and 87.1% in terms of biomass. Cod constituted 0.7% (combined index Q i ) of the overall diet and 2.3% in terms of biomass. Fish length estimates showed that seals generally prefer small fish below minimum allowed landing size. Estimated total amount of fish consumed was 315 tons per year and was dominated by non-commercial species. Annual cod consumption was an estimated 7.1 tons, representing 5% of annual cod landings, suggesting that competition between local fisheries and harbour seals is limited.en_US
dc.language.isoengen_US
dc.titleDiet composition and biomass consumption of harbour seals in Telemark and Aust-Agder, Norwegian Skagerraken_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber1-13en_US
dc.source.volume16en_US
dc.source.journalMarine Biology Researchen_US
dc.source.issue4en_US
dc.identifier.doi10.1080/17451000.2020.1751205
dc.identifier.cristin1821209
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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