In Yellowstone drama, angry bison threaten a key Western tree

The record numbers of bison in Yellowstone National Park threaten the recovery of the park’s iconic quaking aspen, which scientists had hoped was on the mend, a study has found. The findings, published Tuesday in Ecology and Evolution, reveal a complex drama between plants, predators and prey in the oldest U.S. park — and one of the earliest and most intensive sites of…

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