Blar i forfatter "Mikkelsen, Bjarni"

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    • Horizontal and Vertical Migration of Anglerfish Lophius piscatorius in Relation to Hydrography in Faroese Waters 

      Ofstad, Lise Helen; Hátún, Hjálmar; Pedersen, Torstein; Steingrund, Petur; Mikkelsen, Bjarni (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-04)
      Adult anglerfish conduct annual migrations between spawning areas and feeding areas; for Faroese waters this migration has so far not been described. Therefore, anglerfish migration and distribution in Faroese waters was investigated by mark-recapture studies, including data storage tags, as well as data from scientific trawl surveys, commercial trawlers and gillnetters. The fish distribution was ...

    • Marine mammal consumption and fisheries removals in the Nordic and Barents Seas 

      Skern-Mauritzen, Mette; Lindstrøm, Ulf Ove; Biuw, Martin; Elvarsson, Bjarki; Gunnlaugsson, Thorvaldur; Haug, Tore; Kovacs, Kit M.; Lydersen, Christian; McBride, Margaret; Mikkelsen, Bjarni; Øien, Nils Inge; Víkingsson, Gísli (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-28)
      In this study, we assess prey consumption by the marine mammal community in the northeast Atlantic [including 21 taxa, across three regions: (I) the Icelandic shelf, Denmark Strait, and Iceland Sea (ICE); (II) the Greenland and Norwegian Seas (GN); and (III) the Barents Sea (BS)], and compare mammal requirements with removals by fisheries. To determine prey needs, estimates of energetic requirements ...

    • Transcriptome analysis reveals a high aerobic capacity in the whale brain 

      Kruger, Alena; Fabrizius, Andrej; Mikkelsen, Bjarni; Siebert, Ursula; Folkow, Lars; Burmester, Thorsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-30)
      The brain of diving mammals is repeatedly exposed to low oxygen conditions (hypoxia) that would have caused severe damage to most terrestrial mammals. Some whales may dive for > 2 h with their brain remaining active. Many of the physiological adaptations of whales to diving have been investigated, but little is known about the molecular mechanisms that enable their brain to survive sometimes ...

    • Transcriptomes Suggest That Pinniped and Cetacean Brains Have a High Capacity for Aerobic Metabolism While Reducing Energy-Intensive Processes Such as Synaptic Transmission 

      Geßner, Cornelia; Krüger, Alena; Folkow, Lars; Fehrle, Wilfrid; Mikkelsen, Bjarni; Burmester, Thorsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-09)
      The mammalian brain is characterized by high energy expenditure and small energy reserves, making it dependent on continuous vascular oxygen and nutritional supply. The brain is therefore extremely vulnerable to hypoxia. While neurons of most terrestrial mammals suffer from irreversible damage after only short periods of hypoxia, neurons of the deep-diving hooded seal (Cystophora cristata) show ...