Wolves trigger a trophic cascade to berries as alternative food for grizzly bears. Ripple WJ, Beschta RL, Fortin JK, Robbins CT. Journal of Animal Ecology. 2015 May
Trophic cascades from wolves to grizzly bears in Yellowstone. Ripple WJ, Beschta RL, Fortin JK, Robbins CT. T Journal of Animal Ecology. 2014 Jan