Sustainable Human

How Wolves Change Rivers

10 insights saved from this video by @nature

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A trophic cascade starts with changes at the food chain’s top and spreads through the entire ecosystem.
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In some Yellowstone areas, tree height quintupled in just six years after wolves returned.
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Wolves indirectly reshaped Yellowstone’s rivers, reducing meanders and erosion while creating narrower channels, pools, and riffles.
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In Yellowstone, wolves transformed the ecosystem most consequentially by changing deer behavior, not merely by killing deer.
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Recovering trees increased beaver populations, whose dams created habitats for many additional aquatic and terrestrial species.
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By killing coyotes, wolves helped rabbit and mouse populations rise, supporting more hawks, weasels, foxes, and badgers.
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Deer avoided valleys and gorges where wolves could trap them, allowing vegetation to regenerate.
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Bears reinforced wolves’ effects by killing some deer calves, adding pressure to Yellowstone’s deer population.
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A small number of apex predators transformed Yellowstone’s species composition and physical geography through cascading effects.
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Yellowstone National Park reintroduced wolves in 1995 after they had been absent for 70 years.

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How Wolves Change Rivers: Key Insights & Takeaways | Korva