Abstract for: Yellowstone National Park: How wolves change the behavior of the rivers

Yellowstone wolves that fantastic story, we examine the dynamics of a keystone species like wolves in the Yellowstone, as the wolf population dwindled (1900) and eventually disappeared (1929), the moose and elk population increased, this continued over foraging caused the tree densities of Willows and Aspens around rivers and waterways diminished. However, several other things began to happen as well, the drop in tree density per habitat unit began to change the environment for other animals: Birds, scavengers & beaver populations within the park decreased, with no food source or material to build their dams, the absence of remains, nesting locations provided by trees were now scarce, they began to migrate out of the area to find better hábitats, finally the overall health of the rivers & ecosystem also began to decline. In 1995, almost 65 years after the last wolf was killed, a small population was reintroduced to Yellowstone, over the next 10 years, a dramatic change took place in Yellowstone, before long the balance of the ecosystem is restored completely.