Analyzing thousands of breeding bird surveys sent in by citizen scientists across the western United States and Canada over 35 years, wildlife researchers report that most of the 40 songbird species they studied shifted either northward or toward higher elevation in response to climate change, but did not necessarily do both.
This means that most previous studies of potential climate change impacts on wildlife that looked only at one factor or the other have likely underestimated the effects of environmental warming, say research wildlife biologists David King at the University of Massachusetts Amherst and Sonya Auer of the University of Glasgow, U.K. Their study appears in the current issue of Global Ecology and Biogeography.
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