08/27/2026
The Greater Yellowstone Ecosystem is one of the largest and most intact wild ecosystems remaining in the Lower 48âbut the pressures on it are growing.
In a recent piece for Yellowstonian, Dr. Andrew Hansen, landscape ecologist and professor emeritus at Montana State University, draws on more than three decades of research to examine the mounting threats facing Greater Yellowstone, including habitat fragmentation, development, climate change and potential losses of federal land protections.
The maps included in the piece help put the scale of Greater Yellowstone into perspective. Wildlife do not recognize park, forest or property boundaries. Elk, mule deer, pronghorn, grizzly bears and other species depend on connected landscapes that stretch across the ecosystem. Inventoried roadless lands and Wilderness Study Areas can serve as important links between more permanently protected areas, providing habitat and maintaining wildlife movement across Greater Yellowstone.
For Gallatin Wildlife Association, protecting these connected wildlandsâand the wildlife that depend on themâhas long been at the heart of our work.
We encourage you to read Dr. Hansenâs full piece, âI Have Studied Greater Yellowstone for 33 Years. Never Has It Been So Threatened.â
đ Read the full article from Yellowstonian: https://yellowstonian.org/i-have-studied-greater-yellowstone-for-33-years-never-has-it-been-so-threatened/
Article by Dr. Andrew Hansen / Yellowstonian
đ· Photos and graphics courtesy of Yellowstonian and credited sources. Wildlife movement graphic courtesy of Atlas of Yellowstone, University of Oregon.