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new study suggest that the population of gaint swallowtail butterfly,
and other typically warm climate species, has increased in the state of
Massachusetts as a result of global warming. Photo: Scott M.
Lieberman/Associated Press
Global warming is leading to a population decline in northerly
butterfly species and a flourishing population in subtropical species,
according to a Harvard University study.
The group gathered its data from the Massachusetts Butterfly Club, an
amateur naturalist group that logged nearly 20,000 trips throughout the
state of Massachusetts over the past 19 years.
The findings, published by Harvard University students in Nature Climate Change on Sunday, showed that uncertain climates are changing butterfly communities.
“Over the past 19 years, a warming climate has been reshaping
Massachusetts butterfly communities,” said the study’s lead author, Greg
Breed, in a release.
There were reports of an increase in warm climate species, like the
giant swallowtail and zabulon skipper, which were considered rare to the
region as recently as the 1980s.
However, three quarters of species that were known to thrive in the
north of Boston, Mass., have seen a rapid decline. Those that exist as
eggs or larvae in winter months might have been affected by drought or a
lack of snow, according to the study.
“For most butterfly species, climate change seems to be a stronger
change-agent than habitat loss,” Breed said. “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.”
Source: CBC News
