A tank is better cover than a Humvee. There's generally different herd defense strategies as well when it comes to wolves & bison & elk, plus you have bears really honing in on elk calves as being easier targets of opportunity than bison calves. Bison close in around the weaker herd animals when confronted with a predator, while elk tend to be less congregated during parturition.Bison in the Lamar continue to thrive and expand. They cope with the out of balance predator numbers better than the elk do. Maybe the bison compete with the elk for grass as well?
I would imagine that there is some competition between the two, but with elk having the better mobility, I think they can forage in places other than where the bison are. Is that forage quality though? The former Rep from park County, Alan Redfield, not someone I'd consider a staunch environmentalist, had some pretty good ideas on what's going on inside Yellowstone due to over grazing & drought. He was coming at the issue from a soil science perspective and I think that's a side of this issue that we completely gloss over in favor of whatever critter we want to defend.
Out of balance is subjective though. Humans labor under the misconception that wildlife numbers can be managed on a flat curve and wild undulations in populations are not the norm. That's the hubris of humanity.
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