Gabriela Wagner
Research Scientist
Abstract
The introduction of unmanned aerial vehicles (UAV), or drones, to traditional reindeer herding has – literally – given indigenous Sámi herders a new perspective: the aerial one.
Authors
Galina Gusarova Hedvig Elisabeth Mjøen Magali Corti Frédéric Mahé Pernille Meyer Lilja Steinthorsdottir Marie Kristine Føreid Merkel Stefaniya Kamenova Kamenova Gabriela Wagner Monica Alterskjær Sundset Lars Folkow Tove Hilde Ågnes Utsi Tommi Nyman Cornelya Klutsch Torkild Tveraa Anne Krag Brysting Sylvain Monteux Youri Lammers Eric Coissac Pierre Robert Michel Taberlet Roberto Cazzolla Gatti Inger Greve AlsosAbstract
No abstract has been registered
Authors
Sara A Meier Melanie Furrer Nora Nowak Renato Zenobi Monica Alterskjær Sundset Reto Huber Steven A. Brown Gabriela WagnerAbstract
Reindeer in the Arctic seasonally suppress daily circadian patterns of behavior present in most animals. In humans and mice, even when all daily behavioral and environmental influences are artificially suppressed, robust endogenous rhythms of metabolism governed by the circadian clock persist and are essential to health. Disrupted rhythms foster metabolic disorders and weight gain. To understand circadian metabolic organization in reindeer, we performed behavioral measurements and untargeted metabolomics from blood plasma samples taken from Eurasian tundra reindeer (Rangifer tarandus tarandus) across 24 h at 2-h intervals in four seasons. Our study confirmed the absence of circadian rhythms of behavior under constant darkness in the Arctic winter and constant daylight in the Arctic summer, as reported by others.1 We detected and measured the intensity of 893 metabolic features in all plasma samples using untargeted ultra-high-performance liquid chromatography-mass spectrometry (UPLC-MS). A core group of metabolites (66/893 metabolic features) consistently displayed 24-h rhythmicity. Most metabolites displayed a robust 24-h rhythm in winter and spring but were arrhythmic in summer and fall. Half of all measured metabolites displayed ultradian sleep-wake dependence in summer. Irrespective of the arrhythmic behavior, metabolism is rhythmic (24 h) in seasons of low food availability, potentially favoring energy efficiency. In seasons of food abundance, 24-h rhythmicity in metabolism is drastically reduced, again irrespective of behavioral rhythms, potentially fostering weight gain.