How have wolves changed the rivers in Yellowstone?

Wolves have significantly impacted Yellowstone's rivers through a process known as trophic cascades. Their reintroduction in 1995 helped control the elk population, which in turn allowed for the regrowth of vegetation along riverbanks. This vegetation stabilizes the soil, reduces erosion, and promotes healthier ecosystems, resulting in improved water quality and habitat for various species. Consequently, these changes have led to more diverse and resilient river systems in the park.