Browsing NINA Brage by Author "Jerstad, Kurt"

Now showing items 1-7 of 7

    • Fossekall (Cinclus cinclus), småkraft og avbøtende tiltak. 

      Walseng, Bjørn; Jerstad, Kurt (NINA Rapport;1103, Research report, 2014)
      Denne undersøkelsen er en oppfølging av Walseng & Jerstad (2011) som ga utbyggerne av småkraft råd om avbøtende tiltak for at fossekallen skal kunne hekke også etter utbygging. Ek-semplene det ble vist til i denne rapporten ...

    • Fossekallen i Lyngdalsvassdraget 1978-2011. Har kalking resultert i en bedre hekkesuksess? 

      Jerstad, Kurt; Walseng, Bjørn; Nilsson, Anna; Røstad, Ole Wiggo (NINA rapport;808, Research report, 2012)
      Jerstad, K., Walseng, B., Nilsson, A.L.K. & Røstad, O.W. 2012. Fossekallen i Lyngdalsvassdraget 1978-2011. Har kalking resultert i en bedre hekkesuksess? – NINA Rapport 808. 46 s. Fossekallbestanden har variert fra 20 ...

    • Interactions between demography and environmental effects are important determinants of population dynamics 

      Gamelon, Marlène; Grøtan, Vidar; Nilsson, Anna L. K.; Engen, Steinar; Hurrell, James W.; Jerstad, Kurt; Phillips, Adam S.; Røstad, Ole Wiggo; Slagsvold, Tore; Walseng, Bjørn; Stenseth, Nils Christian; Sæther, Bernt-Erik (Journal article; Peer reviewed, 2017)
      Climate change will affect the population dynamics of many species, yet the consequences for the long-term persistence of populations are poorly understood. A major reason for this is that density-dependent feedback effects ...

    • Long-term annual and spatial variation of polygyny in the white-throated dipper (Cinclus cinclus) 

      Walseng, Bjørn; Durant, Joël; Hessen, Dag Olav; Jerstad, Kurt; Nilsson, Anna; Røstad, Ole Wiggo; Slagsvold, Tore (Peer reviewed; Journal article, 2022)
      Mating strategies are key components in the fitness of organisms, and notably in birds the occurrence of monogamy versus polygyny has attracted wide interest. We address this by a very comprehensive dataset (2899 breeding ...

    • Territory location and quality, together with climate, affect the timing of breeding in the whitethroated dipper 

      Nilsson, Anna; Slagsvold, Tore; Røstad, Ole Wiggo; Knudsen, E.; Jerstad, Kurt; Cadahia, Luis; Reitan, Trond; Helberg, Morten; Walseng, Bjørn; Stenseth, Nils Christian (Journal article; Peer reviewed, 2019)
      Recent climate change has led to advanced spring phenology in many temperate regions. The phenological response to variation in the local environment, such as the habitat characteristics of the territories birds occupy, ...

    • The potential influence of Atlantic salmon Salmo salar and brown trout Salmo trutta on density and breeding of the white-throated dipper Cinclus cinclus 

      Nilsson, Anna; L'Abee-Lund, Jan Henning; Vøllestad, Leif Asbjørn; Jerstad, Kurt; Larsen, Bjørn Mejdell; Røstad, Ole Wiggo; Saltveit, Svein Jakob; Skaugen, Thomas; Stenseth, Nils Christian; Walseng, Bjørn (Journal article; Peer reviewed, 2018)
      Interactions between birds and fish are often overlooked in aquatic ecosystems. We studied the influence of Atlantic salmon and brown trout on the breeding population size and reproductive output of the white-throated ...

    • Vannføring og hekking hos fossekall 

      Walseng, Bjørn; Jerstad, Kurt (NINA Rapport;453, Research report, 2009)
      Utgangspunktet for rapporten var å undersøke om det er mulig å benytte vannføringsdata sammen med data på forekomst og hekkesuksess for å kunne prediktere en ”minstevannfø-ring” for at fossekallen (Cinclus cinclus) skal ...