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Subject:winter bird ranges climate change indicator
From:GORDON ANDERSSON <[log in to unmask]>
Reply-To:GORDON ANDERSSON <[log in to unmask]>
Date:Fri, 30 Apr 2010 22:24:32 -0500
Content-Type:text/plain

EPA has included "bird winter ranges" as one of 24 indicators in a new report on climate change indicators.  The data is from 40 years of Natl Audubon Socy Christmas Bird Count.  They analyzed both an average northward shift in 300+ spp in winter distribution and also an inland shift from coastal areas.  

The EPA link is provided below.  The bird indicator is in the section "Soc'y & Ecosystems". (do control + click; if that doesnt work you can copy and paste to the internet url)  At the end of the report is a chapter "Technical Info about Indicators".  The treatment of the bird data begins on p. 146 in that review.  Here they treat "confounding" variables like bird feeders and the species that did not shift distributions.  

good birding 
 







 
EPA Releases Report on Climate Change Indicators in the U.S. (April 27,
2010) – EPA released a report presenting 24 indicators that will help people track
and understand the causes and effects of climate change. EPA selected the
indicators based on their usefulness, objectivity, data quality, transparency, ability
to show a meaningful trend and relevance to climate change. The indicators
include U.S. greenhouse gas (GHG) emissions, atmospheric concentrations of
GHGs, U.S. and global temperatures, heat waves, drought extent, precipitation
amounts, sea level rise, ocean acidification, extent of Arctic sea ice, size of
glaciers, amount of snow pack, heat-related deaths, length of growing season, leaf
growth and bloom dates and bird wintering ranges. According to EPA, “the
indicators in this report present compelling evidence that the composition of the
atmosphere and many fundamental measures of climate in the United States are
changing.” As new and more complete indicator data become available, EPA
plans to update the indicators presented in the report and provide additional
indicators that can more comprehensively document climate change and its
effects.
 
http://www.epa.gov/climatechange/indicators.html 		 	   		  
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