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Race across the tundra: White spruce vs. snowshoe hare

A hare sits on snow-covered ground.

As some tree species shift northward, it's the tale of the spruce vs. the hare in northern Alaska.

Credit: NPS


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Alaska spruce trees and deciduous shrubs denuded by heavy grazing by snowshoe hares.

These Alaska spruce trees and deciduous shrubs show evidence of heavy browsing by snowshoe hares.

Credit: K. Kielland


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Spruce seedling that has been severely browsed by snowshoe hares.

Spruce seedling at the NSF Bonanza Creek LTER site that's been severely browsed by snowshoe hares.

Credit: J. Olnes


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A researcher examines white spruce trees killed by hare-browsing in northern Alaska.

A researcher examines white spruce trees killed by hare-browsing in northern Alaska.

Credit: K. Kielland


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Snow-covered ground dug into by foraging hares.

Snowshoe hares dig for mineral-laden soils to eat; they use soils to deactivate tannins in forage.

Credit: K. Kielland


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Willow trees denuded by the grazing of hares.

Snowshoe hares also browse on willow trees, here in early spring along Alaska's Dietrich River.

Credit: K. Kielland


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