Blar i forfatter "Steffensen, John Fleng"

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    • Advancing research for the management of long-lived species: A case study on the Greenland Shark 

      Edwards, Jena E.; Hiltz, Elizabeth; Broell, Franziska; Bushnell, Peter G.; Campana, Steven E.; Christiansen, Jørgen Schou; Devine, Brynn M.; Gallant, Jeffrey J.; Hedges, Kevin J.; MacNeil, M. Aaron; McMeans, Bailey C.; Nielsen, Julius; Præbel, Kim; Skomal, Gregory B.; Steffensen, John Fleng; Walter, Ryan P.; Watanabe, Yuuki Y.; VanderZwaag, David L.; Hussey, Nigel E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-02)
      Long-lived species share life history traits such as slow growth, late maturity, and low fecundity, which lead to slow recovery rates and increase a population’s vulnerability to disturbance. The Greenland shark (Somniosus microcephalus) has recently been recognized as the world’s longest-lived vertebrate, but many questions regarding its biology, physiology, and ecology remain unanswered. Here we ...

    • Assessing the reproductive biology of the Greenland shark (Somniosus microcephalus) 

      Nielsen, Julius; Hedeholm, Rasmus B.; Lynghammar, Arve; McClusky, Leon Mendel; Berland, Bjørn; Steffensen, John Fleng; Christiansen, Jørgen Schou (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-07)
      The Greenland shark (<i>Somniosus microcephalus</i>, Squaliformes: Somniosidae) is a long-lived Arctic top predator, which in combination with the high historical and modern fishing pressures, has made it subject to increased scientific focus in recent years. Key aspects of reproduction are not well known as exemplified by sparse and contradictory information e.g. on birth size and number of pups ...

    • Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift 

      Nielsen, Julius; Christiansen, Jørgen Schou; Grønkjær, Peter; Bushnell, Peter G.; Steffensen, John Fleng; Kiilerich, Helene O.; Præbel, Kim; Hedeholm, Rasmus (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-04)
      Current knowledge on the feeding ecology of the Greenland shark (<i>Somniosus microcephalus</i>), a potential top predator in arctic marine ecosystems, is based on small sample sizes as well as narrow size ranges of sharks. Therefore, potential size-related feeding patterns remain poorly documented. Using stomach content data (<i>N</i> = 88) and stable isotope values of white muscle tissue (<i>N</i> ...