Blar i forfatter Norges arktiske universitetsmuseum "Strøm, Hallvard"

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    • Later at higher latitudes: large-scale variability in seabird breeding timing and synchronicity 

      Burr, Zofia M.; Varpe, Øystein; Anker-Nilssen, Tycho; Erikstad, Kjell E; Descamps, Sébastien; Barrett, Robert T.; Bech, Claus; Christensen-Dalsgaard, Signe; Lorentsen, Svein-Håkon; Moe, Børge; Reiertsen, Tone Kristin; Strøm, Hallvard (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-28)
      In seasonal environments, organisms are expected to optimally schedule reproduction within an annual range of environmental conditions. Latitudinal gradients generate a range of seasonality to which we can expect adaptations to have evolved, and can be used to explore drivers of timing strategies across species’ distribution ranges. This study compares the timing of egg hatching in four seabird ...

    • Metapopulation regulation acts at multiple spatial scales: Insights from a century of seabird colony census data 

      Jeglinski, Jana W.E.; Wanless, Sarah; Murray, Stuart; Barrett, Robert; Gardarsson, Arnthor; Harris, Mike P.; Dierschke, Jochen; Strøm, Hallvard; Lorentsen, Svein-Håkon; Matthiopoulos, Jason (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-27)
      Density-dependent feedback is recognized as important regulatory mechanisms of population size. Considering the spatial scales over which such feedback operates has advanced our theoretical understanding of metapopulation dynamics. Yet, metapopulation models are rarely fit to time-series data and tend to omit details of the natural history and behavior of long-lived, highly mobile species such as ...

    • SEAPOP studies in the Lofoten and Barents Sea area in 2005 

      Anker-Nilssen, Tycho; Barrett, Robert T.; Bustnes, Jan Ove; Erikstad, Kjell E; Fauchald, Per; Lorentsen, Svein Håkon; Steen, Harald; Strøm, Hallvard; Systad, Geir Helge Rødli; Tveraa, Torkild (Research report; Forskningsrapport, 2006)
      This is the first annual report from SEAPOP, a long-term seabird programme aiming to provide and maintain base-line knowledge needed for an improved management of marine areas. For several reasons, the activities in the initial year were restricted to the Lofoten and Barents Sea area, but the programme is designed for implementation on the full national scale within a few years. The report ...

    • SEAPOP studies in the Lofoten and Barents Sea area in 2006 

      Anker-Nilssen, Tycho; Barrett, Robert T.; Bustnes, Jan Ove; Erikstad, Kjell Einar; Fauchald, Per; Lorentsen, Svein-Håkon; Steen, Harald; Strøm, Hallvard; Systad, Geir Helge; Tveraa, T (Research report; Forskningsrapport, 2007-04)
      This is the second annual report of the SEAPOP programme, which was initiated in 2005. In 2006, the programme was extended to the near full scale in the Lofoten-Barents Sea area, but it is aimed for implementation at the national level within few years. The report is divided into three sections. The first is an executive summary, the second presents five selected highlights from the studies in ...

    • The status and trends of seabirds breeding in Norway and Svalbard 

      Fauchald, Per; Anker-Nilssen, Tycho; Barrett, Robert T.; Bustnes, Jan Ove; Bårdsen, Bård-Jørgen; Christensen-Dalsgaard, Signe; Descamps, Sebastien; Engen, Sigrid; Erikstad, Kjell E; Hanssen, Sveinn Are; Lorentsen, Svein-Håkon; Moe, Børge; Reiertsen, Tone; Strøm, Hallvard; Systad, Geir Helge (Research report; Forskningsrapport, 2015-03)
      This report presents the updated sizes, trends and spatial distributions of the breeding populations of 17 seabird species breeding in Norway and Svalbard. The analyses are based on available census and monitoring data from SEAPOP; the Norwegian monitoring and mapping program for seabirds. In addition, the report presents results from a species-specific literature review of the most important ...