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Scientists Reviving Extinct Tortoise Species



(p. D1) . . . the story of extinct Galápagos tortoises has taken a strange, (p. D5) and hopeful, twist.

More than a century ago, it turns out, sailors dumped saddlebacked tortoises they did not need into Banks Bay, near Wolf Volcano on Isabela Island. Luckily, tortoises can extend their necks above water and float on their backs. Many of them made it to shore, lumbered across the lava fields and interbred with Isabela's native domed tortoises.

In 2008, scientists tagged and collected blood samples from more than 1,600 tortoises living on the flanks of the volcano. Back in the laboratory, there was a genetic eureka: Eighty-nine of the animals were part Floreana, whose full genetic profile DNA had been obtained from museum samples.

Some had genes indicating their parents were living purebred Floreana tortoises, hinting that the species may not be extinct after all.

Seventeen tortoises were shown to have high levels of Pinta DNA. Tortoises can live for more than 150 years, so some of them may well be George's immediate next of kin.

Last month, scientists went back to find them. Their plan was to capture and separate tortoises with high levels of Pinta and Floreana DNA, and then breed animals that are genetically closest to the original species.

In just a few generations, it should be possible to obtain tortoises with 95 percent of their "lost" ancestral genes, the scientists said.



For the full story, see:

SANDRA BLAKESLEE. "A Lost Species Crawls Back to Life." The New York Times (Tues., DEC. 15, 2015): D1 & D5.

(Note: ellipsis added.)

(Note: the online version of the commentary has the date DEC. 14, 2015, and has the title "Scientists Hope to Bring a Galápagos Tortoise Species Back to Life.")






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