Blar i forfatter "Arnold, Walter"

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    • Determinants of heart rate in Svalbard reindeer reveal mechanisms of seasonal energy management 

      Trondrud, Liv Monica; Pigeon, Gabriel; Albon, Steve; Arnold, Walter; Evans, Alina; Irvine, R. Justin; Król, Elżbieta; Ropstad, Erik; Stien, Audun; Veiberg, Vebjørn; Speakman, John R.; Loe, Leif Egil (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-28)
      Seasonal energetic challenges may constrain an animal's ability to respond to changing individual and environmental conditions. Here, we investigated variation in heart rate, a well-established proxy for metabolic rate, in Svalbard reindeer (Rangifer tarandus platyrhynchus), a species with strong seasonal changes in foraging and metabolic activity. In 19 adult females, we recorded heart rate, ...

    • Disrupted seasonal biology impacts health, food security and ecosystems 

      Stevenson, Tyler J.; Visser, Marcel E.; Arnold, Walter; Barrett, Perry; Biello, Stephany M.; Dawson, Alistair G.; Denlinger, David L.; Dominoni, Davide M.; Ebling, Francis J.P.; Elton, Sarah; Evans, Neil; Ferguson, Heather M.; Foster, Russell G.; Hau, Michaela; Haydon, Daniel Thomas; Hazlerigg, David; Heideman, Paul D.; Hopcraft, John Grant C.; Jonsson, Nicholas N.; Kronfeld-Schor, Noga; Kumar, Vinod Anil; Lincoln, Gerald A.; Macleod, Ross; Martin, Samuel A.M.; Martinez-Bakker, Michaela E.; Nelson, Randy J.; Reed, Thomas E.; Robinson, Jane E.; Rock, Daniel Joseph E.; Schwartz, William J.; Steffan-Dewenter, Ingolf; Tauber, Eran; Thackeray, Stephen J.; Umstätter, Christina; Yoshimura, Takashi; Helm, Barbara (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-22)
      The rhythm of life on earth is shaped by seasonal changes in the environment. Plants and animals show profound annual cycles in physiology, health, morphology, behaviour and demography in response to environmental cues. Seasonal biology impacts ecosystems and agriculture, with consequences for humans and biodiversity. Human populations show robust annual rhythms in health and well-being, and the ...

    • Fat storage influences fasting endurance more than body size in an ungulate 

      Trondrud, Liv Monica; Pigeon, Gabriel; Król, Elżbieta; Albon, Steve; Evans, Alina; Arnold, Walter; Hambly, Catherine; Irvine, R. Justin; Ropstad, Erik; Stien, Audun; Veiberg, Vebjørn; Speakman, John R.; Loe, Leif Egil (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-26)
      <ol> <li>The fasting endurance hypothesis (FEH) predicts strong selection for large body size in mammals living in environments where food supply is interrupted over prolonged periods of time. The Arctic is a highly seasonal and food restricted environment, but contrary to predictions from the FEH, empirical evidence shows that Arctic mammals are often smaller than their temperate conspecifics. ...