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Arctic and red fox population responses to climate and cryosphere changes at the Arctic’s edge

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Abstract

Responses of one species to climate change may influence the population dynamics of others, particularly in the Arctic where food webs are strongly linked. Specifically, changes to the cryosphere may limit prey availability for predators. We examined Arctic (Vulpes lagopus) and red fox (V. vulpes) population dynamics near the southern edge of the Arctic fox distribution using fur harvest records from Churchill, Manitoba, Canada between 1955 and 2012. Arctic foxes showed a declining population trend over time (inferred from harvest records corrected for trapping effort), whereas the red fox population trend was relatively stable. The positive relationship between the annual Arctic and red fox harvests suggested interspecific competition did not promote the Arctic fox decline. To investigate alternative mechanisms, we evaluated the relative influence of sea-ice phenology, snow depth, snow duration, winter thaws, and summer temperature on the harvest dynamics of both species in the most recent 32 years (1980–2012; n = 29) of our data. Arctic fox harvests were negatively related to the length of time Hudson Bay was free of sea ice. Shorter sea ice duration may reduce access to seal carrion as an alternative winter food source when lemming densities decline. Contrary to our prediction, red fox harvest was not related to summer temperature but was positively related to snow depth, suggesting winter prey availability may limit red fox population growth. Predators have an important ecological role, so understanding the influence of changes in the cryosphere on predator–prey interactions may better illuminate the broader influence of climate change on food-web dynamics.

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The data are available from the authors upon reasonable request.

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Acknowledgements

We thank Dean Berezanski and Manitoba’s Wildlife Branch for providing fox harvest information, including the number of permits issued and pelt prices. We also thank John Markham and LeeAnn Fishback for their suggestions on previous drafts of the manuscript, and Alex Roth for creating the conceptual diagram.

Funding

Funding was provided by the Natural Sciences and Engineering Research Council of Canada (Discovery grant 386704).

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JV conceived the study and led the writing, SJB led the statistical analysis, and JR provided supervisory input at all stages. All authors contributed to data interpretations and final revisions of the manuscript.

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Correspondence to James D. Roth.

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Additional information

Communicated by Anders Angerbjörn.

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Supplementary file1 (DOCX 125 KB)

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Verstege, J.S., Johnson-Bice, S.M. & Roth, J.D. Arctic and red fox population responses to climate and cryosphere changes at the Arctic’s edge. Oecologia 202, 589–599 (2023). https://doi.org/10.1007/s00442-023-05418-6

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  • DOI: https://doi.org/10.1007/s00442-023-05418-6

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