Abstract
Declining use and abandonment of traditional ranges by migratory caribou (Rangifer tarandus) have often been related to density-dependent depletion of summer forage. The Pen Islands caribou herd (R. t. caribou), Ontario and Manitoba, Canada, numbered in the thousands on its traditional summer tundra range during the 1980s, but then declined in that region. We postulated that increased caribou abundance over three decades negatively affected phytomass, given that under the exploitation ecosystem hypothesis (EEH), grazers limit the amount of primary production if few predators are present. We tested this prediction using the Normalized Difference Vegetation Index (NDVI), as a proxy for phytomass available to caribou. We lagged caribou abundance in the explanatory model by the number of years (4–7) between peak caribou abundance and minimum NDVI. NDVI was negatively related to caribou abundance lagged by 6 years, and growing degree days explained much of the annual variation in NDVI. Precipitation was not an important predictor in the model. Our study is the first to apply NDVI to support the EEH for caribou. We propose that this method could be used over broad scales to shed light on limiting factors for migratory caribou across the circumpolar North.
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Acknowledgments
Financial support was provided by the Ontario Ministry of Natural Resources (Wildlife Research and Monitoring Section and Far North Branch), a Natural Sciences and Engineering Research Council of Canada (NSERC) grant to JS, and a NSERC Scholarship, Ontario Graduate Scholarship, Northern Scientific Training Program grant, Canadian National Sportsmen’s Shows grant, and David and Joyce Woods Graduate Scholarship to EJN. This work was made possible through data collection carried out by OMNR personnel, pilots, engineers, and volunteers. We thank also those who aided with mapping, statistics, remote sensing and other guidance: Guillaume Bastille-Rousseau, Dennis Duro, Shinichi Nakagawa, Mort Canty, Todd Schroeder, Steven Franklin, Erica Nol, Megan Hornseth, Mike Kyffin, Tracy Armstrong, Jane Devlin, Max DeBues, Kaiti Nixon, and Brad Vandermeulen.
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Newton, E.J., Pond, B.A., Brown, G.S. et al. Remote sensing reveals long-term effects of caribou on tundra vegetation. Polar Biol 37, 715–725 (2014). https://doi.org/10.1007/s00300-014-1472-3
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DOI: https://doi.org/10.1007/s00300-014-1472-3