Magnus Andersen

Denning Phenology Mediates Sea‐Ice Loss Impacts on Early Reproductive Success in Polar Bears

Marwan Naciri, Jon Aars, Marlène Gamelon, Magnus Andersen et autres

Climate change is disrupting myriad biological processes, including the ability of species to synchronize life-history events with optimal environmental conditions, with potential fitness impacts. Changes in migratory and breeding phenology and their consequences on fitness have been well studied in birds and …

fr, no, ca (code pays fourni par la source)

Pulse of the Arctic: feasibility of long-term physiological monitoring of polar bears using implantable heart rate and temperature loggers

Marie‐Anne Blanchet, Magnus Andersen, Rolf-Arne Ølberg, Ásgeir Bjarnason et autres

Abstract Background Energy expenditure shapes key biological functions in animals, including reproduction, growth, foraging, and survival. Yet quantifying energy expenditure over long periods in wildlife, especially in remote Arctic environments, remains difficult. Traditional approaches of estimating metabolic rate using heart rate (HR) …

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Pulse of the Arctic: feasibility of long-term physiological monitoring of polar bears using implantable heart rate and temperature loggers

Marie‐Anne Blanchet, Magnus Andersen, Rolf-Arne Ølberg, Ásgeir Bjarnason et autres

Abstract Background Energy expenditure shapes key biological functions in animals, including reproduction, growth, foraging, and survival. Yet quantifying energy expenditure over long periods in wildlife, especially in remote Arctic environments, remains difficult. Traditional approaches of estimating metabolic rate using heart rate (HR) …

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Additional file 1 of Pulse of the Arctic: feasibility of long-term physiological monitoring of polar bears using implantable heart rate and temperature loggers

Marie‐Anne Blanchet, Magnus Andersen, Rolf-Arne Ølberg, Ásgeir Bjarnason et autres

Supplementary Material 1.

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Additional file 1 of Pulse of the Arctic: feasibility of long-term physiological monitoring of polar bears using implantable heart rate and temperature loggers

Marie‐Anne Blanchet, Magnus Andersen, Rolf-Arne Ølberg, Ásgeir Bjarnason et autres

Supplementary Material 1.

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Offspring number, size, and survival: State‐dependent optimization of litter size in a long‐lived capital breeder

Marwan Naciri, Jon Aars, Magnus Andersen, Marie‐Anne Blanchet et autres

Abstract Seventy‐five years ago, Lack proposed that there should be an optimal clutch size shared by all individuals in a population and favored by natural selection, which maximizes the number of recruited offspring. While some studies support this “common optimum” hypothesis, others …

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Anti-icing properties of polar bear fur

Julian Carolan, Martin Jakubec, Neubi Francisco Xavier, Adam Pestana Motala et autres

) is the only Arctic land mammal that dives into water to hunt. Despite thermal insulation provided by blubber and fur layers and low Arctic temperatures, their fur is typically observed to be free of ice. This study investigates the anti-icing properties …

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Harvest sustainability assessments need rethinking under climate change: A ringed seal case study from Svalbard, Norway

Chloé R. Nater, Christian Lydersen, Magnus Andersen, Kit M. Kovacs

Abstract Throughout the Arctic, ice‐affiliated marine mammals constitute local subsistence resources but detrimental effects of declines in their sea ice habitats create a need for harvest sustainability assessments in light of climate change. At the same time, empirical data required for thorough …

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A risk assessment review of mercury exposure in Arctic marine and terrestrial mammals

Runé Dietz, Robert J. Letcher, Jon Aars, Magnus Andersen et autres

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Spatial variation in mercury concentrations in polar bear (Ursus maritimus) hair from the Norwegian and Russian Arctic

Anna Lippold, Andrei Boltunov, Jon Aars, Magnus Andersen et autres

We examined spatial variation in total mercury (THg) concentrations in 100 hair samples collected between 2008 and 2016 from 87 polar bears (Ursus maritimus) from the Norwegian (Svalbard Archipelago, western Barents Sea) and Russian Arctic (Kara Sea, Laptev Sea, and Chukchi Sea). …

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Sea ice reduction drives genetic differentiation among Barents Sea polar bears

Simo N. Maduna, Jon Aars, Ida Fløystad, Cornelya F. C. Klütsch et autres

Loss of Arctic sea ice owing to climate change is predicted to reduce both genetic diversity and gene flow in ice-dependent species, with potentially negative consequences for their long-term viability. Here, we tested for the population-genetic impacts of reduced sea ice cover …

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Emerging Role of gait analysis in the Diagnosis of post-stroke hemiparesis

Anders Johansson, Magnus Andersen, Freya Andersen

Background: Hemiparesis after stroke disrupts nearly every measurable feature of walking, and visual bedside description of "hemiplegic gait" is too coarse to reliably guide targeted rehabilitation or to track recovery over time. Objective: This review synthesizes the published evidence on gait analysis …

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