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Massachusetts butterflies move north as climate warms
Date:8/19/2012

PETERSHAM, Mass. (August 19, 2012)---The authors of a Harvard study published today in Nature Climate Change gathered their data from an unlikely sourcethe trip accounts of the Massachusetts Butterfly Club. Over the past 19 years, the amateur naturalist group has logged species counts on nearly 20,000 expeditions throughout Massachusetts. Their records fill a crucial gap in the scientific record.

Once analyzed, the data show a clear trend. According to Greg Breed, lead author on the study and a post-doctoral fellow at the Harvard Forest in Petersham, Mass., "Over the past 19 years, a warming climate has been reshaping Massachusetts butterfly communities." Subtropical and warm-climate species such as the giant swallowtail and zabulon skippermany of which were rare or absent in Massachusetts as recently as the late 1980sshow the sharpest increases in abundance. At the same time, more than three quarters of northerly speciesspecies with a range centered north of Bostonare now declining in Massachusetts, many of them rapidly. Most impacted are the species that overwinter as eggs or small larvae: these overwintering stages may be much more sensitive to drought or lack of snow cover.

The study creates new questions for managing threatened species. "For most butterfly species, climate change seems to be a stronger change-agent than habitat loss. Protecting habitat remains a key management strategy, and that may help some butterfly species. However, for many others, habitat protection will not mitigate the impacts of warming," says Breed. He points to the frosted elfin, a species that receives formal habitat protection from the state. This southerly distributed butterfly is now one of the most rapidly increasing species in Massachusetts, with an estimated 1000% increase since 1992. Some of this increase may be due to habitat protections, Breed allows. But over the same period, atlantis and aphrodite fritillaries, historically common summer butter
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Contact: Clarisse Hart
hart3@fas.harvard.edu
978-756-6157
Harvard University
Source:Eurekalert

Page: 1 2

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