25 -Gymnosperms- Advances in reproduction 1

25 -Gymnosperms- Advances in reproduction 1 - Fact of the...

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Fact of the day Actual scientific puclication: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2486.2011.02571.x/full in The “USA Today” yesterday http://content.usatoday.com/communities/gre enhouse/post/2011/11/us-forests-climate- change-not-adapting/1?csp=34news DURHAM, N.C. -- More than half of eastern U.S. tree species aren't adapting to climate change as quickly or consistently as predicted, according to a Duke University study. “Models have suggested that trees will migrate rapidly to higher latitudes and elevations in response to warming temperatures, but evidence for this is essentially absent in this large analysis," says James Clark at Duke's School of the Environment. 59 percent of species examined by Clark and colleagues showed geographic ranges contracting from both the north and south. Fewer species (21%) appeared to be shifting northward as predicted. 16 percent seemed to be advancing southward. The scientists analyzed data on 92 species in more than 43,000 forest plots in 31 states. The study did not find evidence that population spread is greater where climate has changed the most; nor are patterns related to seed size or dispersal characteristics. "Warm zones have shifted northward by up to 100 kilometers in some parts of the eastern United States, but
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25 -Gymnosperms- Advances in reproduction 1 - Fact of the...

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