Endangered green sea turtles shatter nesting record
MELBOURNE, Fla. — Four decades ago, biologists thought green sea turtles might go extinct. But this year, the endangered reptile dug a record number of nests at the Archie Carr National Wildlife Refuge, with two months still left in their nesting season.
« It’s an incredible thing, » said Llew Ehrhart, professor emeritus at University of Central Florida, who’s studied turtle nesting at Archie Carr since the 1980s.
In the 1970s, biologists could only find a handful of green sea turtles nests at Archie Carr and theMelbourne Beach area.
This year, UCF researchers counted 12,026 green turtle nests at Archie Carr refuge, already crushing a record the turtles set at the refuge in 2013 — 11,839 nests.
In general, green sea turtles nesting has « on » years and « off » years, with the number of nests spiking every other year. So biologists anticipated an « on » year. But this is the first time green turtle nests surpassed 12,000 nests, UCF researchers said.
Nesting on the « on » years has ballooned, from 455 nests in 1988 to more than 8,400 nests by 2000.
And now they dig six times that amount of nets.
« This is really a comeback story, » Kate Mansfield, a UCF assistant professor of biology, said in a release. Mansfield leads a team of students and research scientists who monitor turtle counts on the beach during turtle nesting season, which runs May 1 to Oct. 1.
« It is a really remarkable recovery and reflects a ‘perfect storm’ of conservation successes, » Mansfield added, « from the establishment of the Archie Carr, to implementing the Endangered Species Act, among many other conservation initiatives. It will be very exciting to see what happens over the next 20 plus years. »
Green sea turtles are just one of three species that use the refuge as their nesting grounds.
Sea turtles dig about 80 percent of their nests in the United States. Archie Carr is home to one of the largest nesting beaches for loggerhead turtles in the Western Hemisphere, with among the highest density of nests.
Hatchlings paddle out against an ever-strengthening current of challenges, which only the fittest of every 10,000 fends off long enough to become an adult turtle.
The increase in green sea turtles nesting is four decades of conservation measures paying off, Ehrhart says.
Native Americans and early European settlers also once harvested green sea turtles for their meat.
But laws prohibiting the harvesting of sea turtles, excessive beach lighting and fishing nets that cause turtles to drown have helped their numbers rebound.
In 1978, the federal government listed the green sea turtle under the Endangered Species Act.
Green sea turtle populations in Florida and the Pacific coast of Mexico are listed as endangered. Elsewhere, the species is listed as threatened.