For example, the bark of young quaking aspen may be grayish-white but as the tree ages, the bark, especially around the base, becomes darker and furrowed and even a bit “warty.” ...

The quaking aspen (Populus tremuloides) is one of Colorado’s most iconic trees and maybe its most dramatic. With smooth white ...

Closer to home, aspen trees have a layer of green bark underlying the external whitish bark. Even in winter, when the leaves have dropped, the bark can use the available daylight to make sugars ...

Gray wolves were reintroduced in Yellowstone National Park in 1995 to help control the numbers of elk that were eating young trees, and it is finally paying off for quaking aspen.

For some trees, winter does not mean a complete cessation in photosynthetic activity or growth. Quaking aspens store chlorophyll beneath their bark (particularly in younger trees), this is what ...

Aspen forest is reclaiming the skyline of Yellowstone National Park after decades of controversy over efforts to return ...

The reintroduction of large carnivores has initiated a recovery process that had been shut down for decades,” says Painter in a statement.

Aspen trees are getting a boost from wolves at Yellowstone National Park, new research suggests. For the first time in 80 years, baby aspens are growing tall and healthy in the northern part of the ...

Sudden Aspen Decline, or SAD, is the widespread rapid and severe deterioration in tree health. Researchers observed this decline across Colorado nearly two decades ago, and it hasn’t let up.

FLAGSTAFF — As flurries started to descend on the forest floor, a team of researchers examined a stand of sickly quaking aspen trees off U.S. Highway 180, just north of Flagstaff. To an ...