Homage to Hersteinsson and Macdonald: climate warming and resource subsidies cause red fox range expansion and Arctic fox decline

  • Bodil Elmhagen Department of Zoology, Stockholm University, Stockholm
  • Dominique Berteaux Canada Research Chair on Northern Biodiversity and Centre for Northern Studies, Université du Québec à Rimouski, Rimouski
  • Robert M. Burgess ABR, Inc. – Environmental Research and Services, Fairbanks, AK
  • Dorothee Ehrich Canada Research Chair on Northern Biodiversity and Centre for Northern Studies, Université du Québec à Rimouski, Rimouski
  • Daniel Gallant Canada Research Chair on Northern Biodiversity and Centre for Northern Studies, Université du Québec à Rimouski, Rimouski; Canada Research Chair in Polar and Boreal Ecology, Université de Moncton, Moncton, and Kouchibouguac National Park of Canada, Kouchibouguac, Canada
  • Heikki Henttonen Forest and Animal Ecology, Natural Resources Institute Finland, Helsinki
  • Rolf A. Ims Department of Arctic and Marine Biology, University of Tromsø, Tromsø
  • Siw T. Killengreend Department of Arctic and Marine Biology, University of Tromsø, Tromsø
  • Jukka Niemimaa Forest and Animal Ecology, Natural Resources Institute Finland, Helsinki
  • Karin Norén Department of Zoology, Stockholm University, Stockholm
  • Tuomo Ollila Parks and Wildlife, Metsähallitus, Rovaniemi
  • Anna Rodnikova Faculty of Biology, Lomonosov Moscow State University, Moscow
  • Aleksandr A. Sokolov Science Center for Arctic Studies (State Organization of Yamal-Nenets Autonomous District) and Arctic Research Station of Institute of Plant and Animal Ecology, Ural Branch of Russian Academy of Sciences, Labytnangi
  • Natasha A. Sokolova Science Center for Arctic Studies (State Organization of Yamal-Nenets Autonomous District) and Arctic Research Station of Institute of Plant and Animal Ecology, Ural Branch of Russian Academy of Sciences, Labytnangi, Russia
  • Alice A. Stickney Ester, AK
  • Anders Angerbjörn Department of Zoology, Stockholm University, Stockholm
Keywords: Climate change; range shift; resource subsidy; mesopredator release; Vulpes lagopus; Vulpes vulpes

Abstract

Climate change can have a marked effect on the distribution and abundance of some species, as well as their interspecific interactions. In 1992, before ecological effects of anthropogenic climate change had developed into a topical research field, Hersteinsson and Macdonald published a seminal paper hypothesizing that the northern distribution limit of the red fox (Vulpes vulpes) is determined by food availability and ultimately climate, while the southern distribution limit of the Arctic fox (Vulpes lagopus) is determined by interspecific competition with the larger red fox. This hypothesis has inspired extensive research in several parts of the circumpolar distribution range of the Arctic fox. Over the past 25 years, it was shown that red foxes can exclude Arctic foxes from dens, space and food resources, and that red foxes kill and sometimes consume Arctic foxes. When the red fox increases to ecologically effective densities, it can cause Arctic fox decline, extirpation and range contraction, while conservation actions involving red fox culling can lead to Arctic fox recovery. Red fox advance in productive tundra, concurrent with Arctic fox retreat from this habitat, support the original hypothesis that climate warming will alter the geographical ranges of the species. However, recent studies show that anthropogenic subsidies also drive red fox advance, allowing red fox establishment north of its climate-imposed distribution limit. We conclude that synergies between anthropogenic subsidies and climate warming will speed up Arctic ecosystem change, allowing mobile species to establish and thrive in human-provided refugia, with potential spill-over effects in surrounding ecosystems.

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Published
2018-11-23