The Great Smoky Mountains National Park, in North Carolina and Tennessee contains about 75% of all southern spruce-fir ecosystems.
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The Spruce-fir moss spider, which lives on moss mats below the forest canopy, is considered endangered due to the decline of the Fraser fir.
The species is severely damaged by a non-native insect, the Balsam woolly adelgid (Adelges piceae).
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