Blar i NINA Brage på forfatter "Varpe, Øystein"

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    • Aggregations of foraging black guillemots (Cepphus grylle) at a sea-ice edge in front of a tidewater glacier 

      Varpe, Øystein; Gabrielsen, Geir W. (Peer reviewed; Journal article, 2022)
      Seabirds in cold biomes sometimes aggregate near glacier fronts and at sea-ice edges to forage. In this note, we report on large aggregations of black guillemots (Cepphus grylle) at the edge of sea ice in front of the ...

    • Blue mussels in western Norway have vanished where in reach of crawling predators 

      Meister, Nadja; Langbehn, Tom; Varpe, Øystein; Jørgensen, Christian (Peer reviewed; Journal article, 2023)
      Blue mussels (Mytilus spp.) are declining around the world. In western Norway, they have widely disappeared from rocky shores but still thrive on floating structures. Other refugia are cracks in rocks, exposed sites, and ...

    • Diverging phenological responses of Arctic seabirds to an earlier spring 

      Descamps, Sébastien; Ramírez, Francisco; Benjaminsen, Sigurd; Anker-Nilssen, Tycho; Barrett, Robert; Burr, Zofia; Christensen-Dalsgaard, Signe; Erikstad, Kjell-Einar; Irons, David B.; Lorentsen, Svein-Håkon; Mallory, Mark L.; Robertson, Gregory J.; Reiertsen, Tone Kristin; Strøm, Hallvard; Varpe, Øystein; Lavergne, Sébastien (Peer reviewed; Journal article, 2019)
      The timing of annual events such as reproduction is a critical component of how free‐living organisms respond to ongoing climate change. This may be especially true in the Arctic, which is disproportionally impacted by ...

    • Foraging tactics in dynamic sea-ice habitats affect individual state in a long-ranging seabird 

      Tarroux, Arnaud; Cherel, Yves; Fauchald, Per; Kato, Akiko; Love, Oliver P.; Ropert-Coudert, Yan; Spreen, Gunnar; Varpe, Øystein; Weimerskirch, Henri; Yoccoz, Nigel; Zahn, Sandrine; Descamps, Sebastien (Peer reviewed; Journal article, 2020)
      1. Individual heterogeneity in diet and foraging behaviour is common in wild animal populations, and can be a strong determinant of how populations respond to environmental changes. Within populations, variation in ...

    • Klimaeffektar på svalbardreinens kalvingstidspunkt 

      Veiberg, Vebjørn; Danielsen, Preben; Loe, Leif Egil; Stien, Audun; Peeters, Bart; Hansen, Brage Bremset; Irvine, R. Justine; Ropstad, Erik; Albon, Steve D.; Tveraa, Torkild; Varpe, Øystein (NINA Rapport;1311, Research report, 2017)
      Veiberg, V., Danielsen, P., Loe, L. E., Stien, A., Peeters, B., Hansen, B. B., Irvine, R. J., Ropstad, E., Albon, S. D., Tveraa, T. & Varpe, Ø. (2017) Klimaeffektar på svalbardreinens kalvingstidspunkt – NINA Rapport 1311. ...

    • 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 (Peer reviewed; Journal article, 2016)
      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 ...

    • Seasonal environmental transitions and metabolic plasticity in a sea-ice alga from an individual cell perspective 

      Duncan, Rebecca J.; Søreide, Janne; Nielsen, Daniel A.; Varpe, Øystein; Wiktor, Józef; Tobin, Mark J.; Pitusi, Vanessa; Petrou, Katherina (Peer reviewed; Journal article, 2024)
      Sea-ice microalgae are a key source of energy and nutrient supply to polar marine food webs, particularly during spring, prior to open-water phytoplankton blooms. The nutritional quality of microalgae as a food source ...

    • Spatio-temporal dynamics in microalgal communities in Arctic land-fast sea ice 

      Duncan, Rebecca J.; Søreide, Janne; Varpe, Øystein; Wiktor, Józef; Pitusi, Vanessa; Runge, Elaine; Petrou, Katherina (Peer reviewed; Journal article, 2024)
      Sea ice microalgae are an important source of energy for the polar marine food web, representing the primary carbon source prior to pelagic phytoplankton blooms. Here we investigate community dynamics of sea ice microalgal ...

    • Spring phenology shapes the spatial foraging behavior of Antarctic petrels 

      Fauchald, Per; Tarroux, Arnaud; Tveraa, Torkild; Cherel, Yves; Ropert-Coudert, Yan; Kato, Akiko; Love, Oliver P.; Varpe, Øystein; Descamps, Sébastien (Journal article; Peer reviewed, 2017)
      In polar seas, the seasonal melting of ice triggers the development of an open-water ecosystem characterized by short-lived algal blooms, the grazing and development of zooplankton, and the influx of avian and mammalian ...

    • Variation and correlation in the timing of breeding of North Atlantic seabirds across multiple scales 

      Keogan, Katharine; Daunt, Francis; Wanless, Sarah; Phillips, Richard A.; Alvarez, David; Anker-Nilssen, Tycho; Barrett, Robert; Bech, Claus; Becker, Peter H.; Berglund, Per-Arvid; Bouwhuis, Sandra; Burr, Zofia M.; Chastel, Olivier; Christensen-Dalsgaard, S*; Christensen-Dalsgaard, Signe; Descamps, Sebastien; Diamond, Tony; Elliott, Kyle; Erikstad, Kjell E.; Harris, Mike; Hentati-Sundberg, Jonas; Heubeck, Martin; Kress, Stephen W.; Langset, Magdalene; Lorentsen, Svein-Håkon; Major, Heather L.; Mallory, Mark; Mellor, Mick; Miles, Will T.S.; Moe, Børge; Mostello, Carolyn; Newell, Mark; Nisbet, Ian; Reiertsen, Tone Kristin; Rock, Jennifer; Shannon, Paula; Varpe, Øystein; Lewis, Sue; Phillimore, Albert B. (Peer reviewed; Journal article, 2022)
      1. Timing of breeding, an important driver of fitness in many populations, is widely studied in the context of global change, yet despite considerable efforts to identify environmental drivers of seabird nesting phenology, ...