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In the Eastern US, spring flowers keep pace with warming climate
Date:1/16/2013

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"Both Thoreau and Leopold were part of the 19th century naturalist movement in which individuals often kept meticulous daily journals recording the things they observed in nature," notes Temple. "Most of those journals have been lost over time, but Thoreau and Leopold were famous writers, and their journals have been preserved, providing us with unparalleled historical data."

Comparing modern observations with those gathered by Leopold shows that in 1942, when mean spring temperature in southern Wisconsin was 48 degrees Fahrenheit, black cherry bloomed on May 31. In 2012, with a mean spring temperatures of 54 degree Fahrenheit, black cherry blooms were observed as early as May 6. In 1942, Leopold's notes show the woodland wildflower bloodroot blooming on April 12. In 2012, bloodroot was first observed blossoming March 17.

Together, these two data sets provide a unique record of flowering trends in the eastern United States over a 161-year period, says Temple.

"Leopold and Thoreau had no idea their observations would help us understand responses to human-caused climate change," says Temple. "But Leopold knew his records might be useful in retrospect when he wrote: 'Keeping records enhances the pleasure of the search, and the chance of finding order and meaning in these events.'"


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Contact: Stan Temple
satemple@wisc.edu
608-795-4226
University of Wisconsin-Madison
Source:Eurekalert

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