Blar i Articles på forfatter "Knutsen, Jan Atle"

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    • Activity patterns of wild European lobster Homarus gammarus in coastal marine reserves: implications for future reserve design 

      Moland, Even; Olsen, Esben Moland; Knutsen, Halvor; Knutsen, Jan Atle; Enersen, Svein Erik; André, Carl; Stenseth, Nils Christian (Journal article; Peer reviewed, 2011-05-16)
      European lobster Homarus gammarus in Norway has been in decline over the last 30 to 40 yr, and the species is currently red listed according to International Union for Conservation of Nature criteria. In 2006, experimental ...

    • Egg distribution, bottom topography and small-scale cod population structure in a coastal marine system 

      Knutsen, Halvor; Olsen, Esben Moland; Ciannelli, Lorenzo; Espeland, Sigurd Heiberg; Knutsen, Jan Atle; Simonsen, Jan Henrik; Skreslet, Stig; Stenseth, Nils Christian (Journal article; Peer reviewed, 2007-03-12)
      Coastal marine species with pelagic egg and larval stages, such as the Atlantic cod Gadus morhua, can be structured into genetically distinct local populations on a surprisingly small geographic scale considering their ...

    • Infection of wild fishes by the parasitic copepod Caligus elongatus on the south east coast of Norway 

      Heuch, P. A.; Øines, Ø.; Knutsen, Jan Atle; Schram, Thomas A. (Journal article; Peer reviewed, 2007-09-14)
      Natural Caligus elongatus Nordmann infections of wild coastal fishes on the Norwegian south east coast were monitored at various times of the year from 2002 to 2004. The prevalence for all coastal fish (n = 4427) pooled ...

    • Lobster reserves as a management tool in coastal waters: Two decades of experience in Norway 

      Knutsen, Jan Atle; Kleiven, Alf Ring; Olsen, Esben Moland; Knutsen, Halvor; Espeland, Sigurd Heiberg; Sørdalen, Tonje Knutsen; Thorbjørnsen, Susanna Huneide; Hutchings, Jeffrey; Chacon, Albert Fernandez; Huserbråten, Mats Brockstedt Olsen; Villegas-Ríos, David; Halvorsen, Kim Aleksander Tallaksen; Kleiven, Portia Joy Nillos; Langeland, Thomas Kiland; Moland, Even (Peer reviewed; Journal article, 2022)
      The positive effects of reduced fishing pressure in marine protected areas (MPAs) are now well documented globally. Yet, evidence of MPA benefits from long-term replicated before-after control-impact (BACI) studies and ...

    • Mapping Biological Resources in the Coastal Zone: An Evaluation of Methods in a Pioneering Study from Norway 

      Knutsen, Jan Atle; Knutsen, Halvor; Rinde, Eli; Christie, Hartvig; Bodvin, Torjan (Journal article; Peer reviewed, 2010)
      For many years, the planning and management 8 of terrestrial areas has been supported by a detailed 9 knowledge of the distribution of habitats and their associ- 10 ated species. However, the detailed mapping of biological ...

    • Replicated marine protected areas (MPAs) support movement of larger, but not more, European lobsters to neighbouring fished areas 

      Thorbjørnsen, Susanna Huneide; Moland, Even; Huserbråten, Mats Brockstedt Olsen; Knutsen, Jan Atle; Knutsen, Halvor; Olsen, Esben Moland (Journal article; Peer reviewed, 2018)
      The European lobster Homarus gammarus is heavily exploited in the Norwegian fishery, and several management actions have been implemented to protect the species. Three marine protected areas (MPAs) excluding all but hook ...

    • Restoration of Abundance and Dynamics of Coastal Fish and Lobster Within Northern Marine Protected Areas Across Two Decades 

      Moland, Even; Fernández-Chacón, Albert; Sørdalen, Tonje Knutsen; Villegas-Rios, David; Thorbjørnsen, Susanna Huneide; Halvorsen, Kim Aleksander Tallaksen; Huserbråten, Mats Brockstedt Olsen; Olsen, Esben Moland; Kleiven, Portia Joy Nillos; Kleiven, Alf Ring; Knutsen, Halvor; Espeland, Sigurd Heiberg; Freitas, Carla; Knutsen, Jan Atle (Peer reviewed; Journal article, 2021)
      This article reviews a suite of studies conducted in a network of coastal Marine Protected Areas (MPAs) in Skagerrak, Southeast Norway. In 2006, Norway’s first lobster reserves were implemented, with the aim of protecting ...

    • Small-scale genetic structure in a marine population in relation to water circulation and egg characteristics 

      Ciannelli, Lorenzo; Knutsen, Halvor; Olsen, Esben Moland; Espeland, Sigurd Heiberg; Asplin, Lars; Jelmert, Anders; Knutsen, Jan Atle; Stenseth, Nils Christian (Journal article; Peer reviewed, 2010-10)
      Until the last decade it was assumed that most marine species have pronounced gene flow over vast areas, largely because of their potential for dispersal during early life stages. However, recent genetic, modeling, and ...