Blar i forfatter "Unander, Sigmund"

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    • Experimental harvest reveals the importance of territoriality in limiting the breeding population of Svalbard rock ptarmigan 

      Pedersen, Åshild Ønvik; Soininen, Eeva M; Unander, Sigmund; Willebrand, Maria Hörnell; Fuglei, E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      The Svalbard rock ptarmigan (Lagopus muta hyperborea) is an endemic subspecies of rock ptarmigan inhabiting the high Arctic archipelagos of Svalbard and Franz Josefs Land. This ptarmigan species exists at low population densities, with little interannual variations in population numbers, and limited habitat for breeding with less than 5 % of the land area in Svalbard constituting medium to high ...

    • Hidden in the darkness of the Polar night: A first glimpse into winter migration of the Svalbard rock ptarmigan 

      Fuglei, Eva; Blanchet, Marie-Anne; Unander, Sigmund; Ims, Rolf Anker; Pedersen, Åshild Ønvik (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-06-05)
      Among many unknown aspects of the Svalbard rock ptarmigan’s biology is whether the birds migrate seasonally within the Svalbard archipelago. Visual observations in spring and fall have indicated that they could perform long-range migration, a behaviour that would allow them to track seasonal shifts in suitable feeding areas. However, the movement patterns and habitat use of the Svalbard rock ...