Multiple scientists have also challenged ideas about wolves’ positive impact on Wyoming ecosystems. In a 2009 study, the ecologists Scott Creel and David Christ

Multiple scientists have also challenged ideas about wolves’ positive impact on Wyoming ecosystems. In a 2009 study, the ecologists Scott Creel and David Christianson contend that elk’s reduced consumption of willow trees “was more strongly affected by snow conditions than by the presence of wolves.” The scientists Matthew Kauffman, Jedediah Brodie, and Erik Jules also refute the notion that wolves played a central role in helping Yellowstone aspen trees to recover in their 2010 article. That study also concludes that “aspen are not currently recovering in Yellowstone, even in the presence of a large wolf population.” (Other scientists have gone on to disagree with Kauffman, Brodie, and Jules’s findings, publishing scholarly refutations of that study.) Science: A more civil version of the internet refutation "That's just your opinion, man!"