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Threatened butterfly vanishes from Florida refuge
BAHIA HONDA KEY, FLA. (AP) - For more than a year, Bahia Honda State Park biologist Jim Duquesnel traversed the nature sanctuary with two hopes. He wanted to see a Miami blue butterfly and rid the Florida Keys outpost of as many iguanas as he could.
The reason: The Central American invader may be driving the Miami blue into extinction by eating the leaves where it lays its eggs _ a bit of butterfly caviar in every bite.
No confirmed Miami blues have been seen on Bahia Honda since July 2010, and with each passing day it becomes less likely any exist there. The U.S. Fish and Wildlife Service last August issued an emergency listing of the Miami blue as an endangered species and three similar butterflies _ cassius blue, ceranus blue and nickerbean blue _ as threatened. The emergency listing continues through April, and federal officials may make it permanent.
In the listing, federal officials noted that the only surviving Miami blue population appears to be a few hundred living in the Key West National Wildlife Refuge, about 50 miles west of Bahia Honda.
Still, Duquesnel has tried to keep hope alive _ and eradicate the iguana from his 600-acre park in the Middle Keys.
Perhaps, he says, a half dozen Miami blues survive on some corner of the island, waiting for the right weather to emerge.
“And if that happens and the weather starts changing and if Miami blues start breeding, we want them to find this a good place to be doing that like they used to,” he says. “In this case, that means it will be lacking in iguanas.”
If the Miami blue makes a comeback, it wouldn’t be the first time.
The pale blue butterfly _ about the size of a quarter _ was once ubiquitous in the hardwood hammocks, pines and scrub along the Florida coasts from the Keys north to Tampa Bay on the Gulf Coast and Cape Canaveral on the Atlantic. But the region’s development after World War II slowly shrank its habitat until by the early 1990s it was found only in the Keys.
After the monstrous winds of Hurricane Andrew blew through the islands in 1992, no Miami blues were to be found and many thought them extinct.
But seven years later, a colony of 50 was found in Bahia Honda and it slowly grew.
Their population grew into the hundreds, until they were easy to spot year round from public trails. Jaret Daniels, a butterfly specialist at the University of Florida, remembers Miami blues landing on his hat.
“You could always swat them away. There were hundreds,” Daniels says. “I’m sure thousands of people walked by with Miami blues flying around them.”
Daniels and other scientists collected Miami blues from the park for a captive breeding program at the University of Florida’s Maguire Center for Lepidoptera and Environmental Research. Roughly 30,000 were bred in a lab from 2003 to 2010, and Florida scientists transplanted the butterflies in the Upper Keys to try to expand the Miami blue’s geographic range.
None of those colonies survived, but scientists clung to hope for the species because a new population of Miami blues was discovered in 2006 on a remote island in the Key West refuge.
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