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Herbivory dominates the spring diet of American black bears (Ursus americanus) in a wood bison (Bison bison athabascae) neonatal range, suggesting minimal bison consumption

Sharp, Molly1; Nielsen, Scott1; Edwards, Mark12

Published Mar 16, 2026 on Dryad. https://doi.org/10.5061/dryad.cc2fqz6hh

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Abstract

Studying an organism's foraging behavior, especially for predator species, provides insight into their ecology, habitat needs, and interspecific relationships. American black bears (Ursus americanus) are generalist omnivores, with a diet primarily composed of vegetation and are known predators for a number of ungulate species, particularly their neonates. In this study, we analyzed the spring diet of black bears occupying the neonatal range of a small, threatened wood bison (Bison bison athabascae) herd in the Ronald Lake area of northeast Alberta to determine the predation risk of neonate bison. To estimate black bear consumption rates of bison we used scat analysis and DNA metabarcoding to describe the spring diet of bears occupying the RLBH’s neonatal range. If black bears occupying the RLBH’s neonatal range are consuming bison, either through predation or scavenging, then we would expect bison DNA to be present in black bear scats. We predicted that the increased availability of neonate bison in the spring would provide bears with greater predation and scavenging opportunities. Conversely, if black bear predation risk is low within the RLBH’s neonatal range, then we would predict that herbaceous plants would dominate black bear diet early in the spring and berries later in the spring and summer. The spring diet of black bears was dominated by herbaceous and fruiting plants. Bison DNA, without visual evidence of animal remains, was found in only 1 of 79 scat samples (1.3%). Our results suggest that consumption rates of bison are low and that predation risk to neonate wood bison, during the RLBH’s occupancy of their neonatal range, from black bears is likely minimal despite the two species’ overlap in space and time.