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study-notes.edu/ecology/unit-4
The Wolves That Changed Yellowstone's Rivers
Unit 4 · Ecology reading · 6 min

Reintroduced in 1995, the wolves set off a trophic cascade: elk stopped overgrazing the valleys, willow and aspen returned along the banks, and beavers, absent for decades, began building dams again.

Quick check: what is a trophic cascade?
A. A seasonal migration between feeding grounds
B. Effects that ripple down a food chain from its top
C. A waterfall formed by beaver dams
D. Competition between two apex predators
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