Sea turtles fitted with GPS in Phuket

Initial GPS data suggest that green sea turtles released as adolescents have a 50% chance of survival, much higher than the 1% figure among hatchlings.

PHUKET CITY: Researchers from the Phuket Marine Biological Center (PMBC) have fastened GPS electronic tracking devices to the backs of eight young green turtles, which will be released off the coast in Phang Nga. The small GPS transmitters will transfer important research data back to the PMBC at Cape Panwa.

These turtles will provide much needed information about the behavior patterns of hatchery turtles released in local waters, said PMBC sea turtle researcher Supot Jantrapornsilp.

The project marks the first time the PMBC has used such technology to gather tracking data on non-adult green turtles.

PMBC researchers have studied green turtles using GPS tracking methods for 10 years, but those efforts focused on reproductive behavior of adult turtles.

In a recent study, four adolescent hatchery turtles fitted with GPS devices were released near Mannai Island in Chonburi. Months later, two of the young turtles were still sending signals, from waters off Nakhon Sri Thammarat and Surat Thani.

Although the numbers are too small to be statistically significant, the researchers are heartened by the 50% survival rate because green turtles hatched in the wild have only a 1% chance of survival.

Turtles born and raised in a hatchery and released when they are bigger and stronger have a greater chance of survival, the initial GPS data seem to indicate.

-- Phuket Gazette 2010-01-04

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I wonder if they use Google Latitude to track the turtles. Probably not, as they will want a historical record of their GPS position at fixed intervals. Would have been nice if the Gazette article had given some technical details.

Does the antenna really have to be that long? How is the battery recharged, with the animals in the wild?

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Maestro