Invasive caterpillars can make aspen forests more toxic for native insects—ecologists explain how
Quaking aspen (Populus tremuloides) is the most widespread tree species in North America. As a keystone species, aspen ...
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Aspen archive: Trees tell archeological stories of shepherds
In the 19th and 20th centuries, many left their marks on the bark of aspen trees as they traveled through, and camped in, groves accompanied by herds of hundreds or thousands of sheep. Their ...