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It's World Turtle Day

作者: Emily Gertz
   
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Photo of tiny bog turtle
Bog Baby
Bog turtles, found from Vermont to Georgia, and inland to Ohio, are among the smallest known turtles: Even full grown, they average around four ounces in weight and four inches long. Despite its wide geographic range, the bog turtle has become much rarer due to loss of habitat. It's listed as threatened under the Endangered Species Act.
U.S. Fish & Wildlife Service

It's World Turtle Day today—an annual celebration created by the group American Tortoise Rescue to generate admiration and conservation mojo for these shell-toting reptiles.

Turtles, tortoises, terrapins: Whatever they're called, as a group they date back to the Late Triassic Period, around 220 million years ago, making them among the most ancient of contemporary reptiles.

They can range widely in size: Among the smallest is the bog turtle, which tops out at 4.5 inches and about 4 ounces. The largest is the leatherback sea turtle, which can grow to over six feet long (shell edge to shell edge) and weigh from 500 to 2,000 pounds.

Leatheback Sea Turtle
Leatherback Sea Turtle
The leatherback sea turtle weighs only about two ounces at hatching, but adults can grow up to six feet long (in shell length) and range from 500 to 2,000 lbs. It's also a deep diver, able to descend below 3,9000 feet. This leatherback sea turtle was photographed on the beach at Sandy Point National Wildlife Refuge, U.S. Virgin Islands.
U.S. Fish & Wildlife Service

Something these two species share, however, is that they—and many other turtle species around the world--are having a hard time surviving into the 21st century:

  • Bog turtles, although widely distributed along the East Coast and into the eastern interior of the United States, are listed as threatened under the Endangered Species Act. The major threats to this small turtle include loss of habitat to urban development, and invasive plants displacing native plants in the marshes, swamps, muddy woodlands, fens, and (yes) bogs that it prefers.
  • Leatherback sea turtles are extremely endangered in many of their traditional habitat ranges around the world. Their numbers are being cut by chemical pollution and coastal development, as well as eating floating plastic bags (which resemble jellyfish, their favorite prey), getting netted with fish as “bycatch,” and poaching.

The National Wildlife Federation recently reported that 2010's Deepwater Horizon oil disaster in the Gulf of Mexico is still affecting many marine species, with around 500 dead sea turtles found in the area every year since 2011-- "a dramatic increase over normal rates."

Over 150 freshwater turtle species (like the box turtle) face equally existential risks worldwide. The New York-based Wildlife Conservation Society is leading a project to breed endangered turtle "assurance colonies": captive populations that, if successful, help assure a species' long-term survival, even if goes extinct in the wild. (Elizabeth Kolbert visits several assurance colony breeding programs--the Hail Mary passes of species conservation--in her book "The Sixth Extinction.") In December the society announced the hatching of five Chinese big-headed turtles, among the world's most endangered turtle species.

 

 

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课本信息
作者: Emily Gertz
发布者: yibei
 
创建时间: 2014-05-28
更新时间: 2014-05-29
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书集: Popular Science
分类: 英文RSS精选