Wolves and the Yellowstone Ecosystem

Top predators are a vital part of an ecosystem, exerting top-down regulation upon the entire system. Ecological sustainability requires reintegrating predators into ecosystems, which necessitates large blocks of habitats adequate to meet their range requirements. The era of ecological restoration is upon us.
New Predator in Yellowstone Reshapes Park's Entire Ecosystem (washingtonpost.com)
Wolves, it turns out, constitute a “keystone species” that is reshaping an entire ecosystem in ways not foreseen when researchers began a crossed-fingers experiment in wildlife preservation.

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