Blar i forfatter "Michelsen, Helena Kling"

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    • Finding the needle in the haystack: Comparison of methods for salmon louse enumeration in plankton samples 

      Bui, Samantha; Dalvin, Sussie; Vågseth, Tone; Oppedal, Frode; Fossøy, Frode; Brandsegg, Hege; Jacobsen, Ása; Nordi, Gunnvør á; Fordyce, Mark; Michelsen, Helena Kling; Finstad, Bengt; Skern-Mauritzen, Rasmus (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-07)
      The economic and social implications of salmon louse (Lepeophtheirus salmonis) epidemics in salmon aquaculture drive focus of the dispersal dynamics of the planktonic larval stages. The vast spatial scale and high connectivity of the marine environment creates difficult conditions to monitor the infective planktonic louse stage, whereby the number of samples required for a representative description ...

    • Prey selection of the Red King Crab (Paralithodes camtschaticus) preying on lumpfish eggs (Cyclopterus lumpus), sea urchins (Strongylocentrotus droebachiensis) and scallops (Chlamys islandica) 

      Michelsen, Helena Kling (Master thesis; Mastergradsoppgave, 2011-05-16)
      The red king crab, Paralithodes camtchaticus, is a new generalist predator in the Barents Sea and may have negative effects upon the commercially fished lumpfish eggs (Cyclopterus lumpus), sea urchins (Strongylocentrotus droebachiensis) and scallops (Chlamys islandica). Generalist predators consume an array of prey types, but have been shown to select certain prey over others. To obtain knowledge ...

    • Seasonal and spatial dynamics of meroplankton in a sub-Arctic fjord With additional focus on larvae of the invasive red king crab 

      Michelsen, Helena Kling (Doctoral thesis; Doktorgradsavhandling, 2017-12-07)
      Many benthic marine organisms produce pelagic larvae, meroplankton, which spend from hours to months in the pelagic. During this time, they form an important part of the pelagic community. Few studies have focused on the year round dynamics of meroplankton, thus many aspects of meroplankton dynamics remains unknown at high-latitudes. In the 1960s the red king crab was intentionally introduced into ...

    • Seasonal dynamics of meroplankton in a high-latitude fjord 

      Michelsen, Helena Kling; Svensen, Camilla; Reigstad, Marit; Nilssen, Einar Magnus; Pedersen, Torstein (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-09)
      Knowledge on the seasonal timing and composition of pelagic larvae of many benthic invertebrates, referred to as meroplankton, is limited for high-latitude fjords and coastal areas. We investigated the seasonal dynamics of meroplankton in the sub-Arctic Porsangerfjord (70°N), Norway, by examining their seasonal changes in relation to temperature, chlorophyll a and salinity. Samples were collected ...

    • Spatial patterns of spring meroplankton along environmental gradients in a sub-Arctic fjord 

      Michelsen, Helena Kling; Nilssen, Einar Magnus; Pedersen, Torstein; Reigstad, Marit; Svensen, Camilla (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-02)
      The spatial patterns in abundance and composition of benthic invertebrate larvae (meroplankton), the correlation between these patterns and environmental variables (temperature, salinity and chl a) and the relative abundance of meroplankton in the mesozooplankton community were investigated in the sub-Arctic Porsangerfjord, Norway (70° N). Zooplankton samples and CTD-profiles were collected at ...

    • Temporal and spatial dynamics of the invasive red king crab and native brachyuran and anomuran larvae in Norwegian waters 

      Michelsen, Helena Kling; Nilssen, Einar Magnus; Pedersen, Torstein; Svensen, Camilla (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-16)
      This study investigates the temporal and spatial patterns of larval stages of the invasive red king crab <i>Paralithodes camtschaticus</i> (RKC) and co-existing native brachyurans and anomurans in a Norwegian fjord. It is one of few field studies describing the larval stage of native and invasive brachyurans and anomurans in the southern Barents Sea. Larvae were collected at 6 to 18 stations at ...