Where have all the aspen gone?

Nature News 2nd October 2006
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David Brill talks to forestry expert Wayne Shepperd, at the Rocky Mountain Research Station at Fort Collins, Colorado, about the mysterious death of these trees in the western United States.

There have long been stories about decling aspen numbers, but you've now realised things have been much worse over the past few years. What is happening?

Aspen here in the western United States regenerate by sprouting from the root system of existing trees, rather than growing from seeds.

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