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Site-specific, long-term research expanding understanding of climate change
Date:12/5/2012

e history on plant community composition.

"The effects of climate change that we are documenting at the Hubbard Brook Experimental Forest truly affect all components of this forest," according to Rustad. "From winter recreation to Lyme Disease to changes in timber resources, what is happening in the forest is going to affect how people live, and science needs to address those questions."

Data from Hubbard Brook Experimental Forest show unequivocally that the climate has warmed, and temperature matters for species from the minute to the mighty. A warming climate is increasing the length of the growing seasons, as spring is advancing and fall is retreating. This extends the breeding season for birds, but also makes them more susceptible to late season frosts. Less snow in winter means more soil frost, which can damage tree roots and reduce the diversity and abundance of arthropods. Reductions in soil arthropods may directly affect the animals that feed on them, with ripple effects on the entire forest food web.

Warming winters also affect the distribution of pests and pathogens, such as the hemlock woolly adelgid, which are fundamental agents of disturbance in northeast forests. The insect's expansion north has been checked by its inability to tolerate temperatures colder than 13 degrees Fahrenheit, however researchers found that over the past 50 years Hubbard Brook Experimental Forest has experienced a 40 percent decline in days with a mean temperature of 13 degrees Fahrenheit, suggesting a potential for the hemlock woolly adelgid to affect hemlock throughout the tree's entire range within the next 30 years.


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Contact: Jane Hodgins
jmhodgins@fs.fed.us
651-649-5281
USDA Forest Service - Northern Research Station
Source:Eurekalert

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