Supplementary material from "Competition between apex predators? Brown bears decrease wolf kill rate on two continents"
Posted on 2017-01-30 - 09:50
Trophic interactions are a fundamental topic in ecology, but we know little about how competition between apex predators affects predation, the mechanism driving top-down forcing in ecosystems. We used long-term datasets from Scandinavia, Europe, and Yellowstone National Park, North America, to evaluate how grey wolf (Canis lupus) kill rate was affected by a sympatric apex predator, the brown bear (Ursus arctos). We used kill interval, i.e. the number of days between consecutive ungulate kills, as a proxy of kill rate. Although brown bears can monopolize wolf kills, we found no support in either study system for the common assumption that they cause wolves to kill more often. By contrast, our results showed the opposite effect. In Scandinavia, wolf packs sympatric with brown bears killed less often than allopatric packs, during both spring, after bear den emergence and summer. Similarly, the presence of bears at wolf-killed ungulates was associated with wolves killing less often during summer in Yellowstone. The consistency in results between the two systems suggests that brown bear presence actually reduces wolf kill rate. Our results suggest that the influence of predation on lower trophic levels may depend on the composition of predator communities.
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Tallian, Aimee; Ordiz, Andrés; C. Metz, Matthew; Milleret, Cyril; Wikenros, Camilla; W. Smith, Douglas; et al. (2017). Supplementary material from "Competition between apex predators? Brown bears decrease wolf kill rate on two continents". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.3677062.v1
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AUTHORS (12)
AT
Aimee Tallian
AO
Andrés Ordiz
MC
Matthew C. Metz
CM
Cyril Milleret
CW
Camilla Wikenros
DW
Douglas W. Smith
DR
Daniel R. Stahler
JK
Jonas Kindberg
DR
Daniel R. MacNulty
PW
Petter Wabakken
JE
Jon E. Swenson
HS
Håkan Sand