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Climate change causing massive movement of tree species across the West
Date:11/3/2011

CORVALLIS, Ore. A huge "migration" of trees has begun across much of the West due to global warming, insect attack, diseases and fire, and many tree species are projected to decline or die out in regions where they have been present for centuries, while others move in and replace them.

In an enormous display of survival of the fittest, the forests of the future are taking a new shape.

In a new report, scientists outline the impact that a changing climate will have on which tree species can survive, and where. The study suggests that many species that were once able to survive and thrive are losing their competitive footholds, and opportunistic newcomers will eventually push them out.

In some cases, once-common species such as lodgepole pine will be replaced by other trees, perhaps a range expansion of ponderosa pine or Douglas-fir. Other areas may shift completely out of forest into grass savannah or sagebrush desert. In central California, researchers concluded that more than half of the species now present would not be expected to persist in the climate conditions of the future.

"Some of these changes are already happening, pretty fast and in some huge areas," said Richard Waring, professor emeritus at Oregon State University and lead author of the study. "In some cases the mechanism of change is fire or insect attack, in others it's simply drought.

"We can't predict exactly which tree (species) will die or which one will take its place, but we can see the long-term trends and probabilities," Waring said. "The forests of our future are going to look quite different."

Waring said tree species that are native to a local area or region are there because they can most effectively compete with other species given the specific conditions of temperature, precipitation, drought, cold-tolerance and many other factors that favor one species over another in that location.

As those climatic conditions change
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Contact: Richard Waring
richard.waring@oregonstate.edu
541-737-6087
Oregon State University
Source:Eurekalert

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