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Old 09-15-2009, 08:22 PM   #1
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Default CA- Vast shift in bird species expected from warming

Vast shift in bird species expected from warming
Peter Fimrite, Chronicle Staff Writer
Wednesday, September 2, 2009

Vast shift in bird species expected from warming
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In one fell swoop, the changes in bird habitats and behavior between now and 2070 will equal the evolutionary and adaptive shifts that normally occur over tens of thousands of years, according to researchers with PRBO, also known as the Point Reyes Bird Observatory.

"What we found is that not only will species shift and communities change, but the composition of communities in certain places will not resemble anything we see today," said Diana Stralberg, a landscape ecologist and the lead author of the report, "Reshuffling of Species With Climate Disruption: A No-Analog Future for California Birds?"
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Old 09-18-2009, 12:49 PM   #2
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Default Sierra Nevada Birds Move In Response To Warmer, Wetter Climate

Sierra Nevada Birds Move In Response To Warmer, Wetter Climate

ScienceDaily (Sep. 14, 2009) If the climate is not quite right, birds will up and move rather than stick around and sweat it out, according to a new study led by biologists at the University of California, Berkeley.

Sierra Nevada Birds Move In Response To Warmer, Wetter Climate
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The researchers focused on abundant bird species whose range was restricted to the western United States. Based upon information from the species' entire North American breeding range, the biologists determined the optimal average temperature and precipitation conditions in which the species breed. These conditions are known as the "Grinnellian niche," named after famed UC Berkeley ecologist Joseph Grinnell, who first developed the concept.
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"This study shows the assumptions that underlie existing forecasts of how species will respond to climate change are valid, at least for most bird species in the mountains of California," said study co-author and conservation biologist Steve Beissinger, UC Berkeley professor of environmental science, policy and management. "This is alarming because forecasts suggest many species will go extinct with the climate warming that we expect to occur, but it also gives us confidence that costly conservation investments made now based on climate forecasts will have a valuable payoff in the future."
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Old 09-18-2009, 12:51 PM   #3
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For information on the Grinnell Resurvey Project, go to: http://mvz.berkeley.edu/Grinnell/index.html.
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