“Local Extinction”: The Climate Crisis Term for a Shift of Species Range
Guest essay by Eric Worrall
Apparently we now need to shut down industrial civilisation to prevent “local extinction” events, scary short distance migrations to more favourable territory.
Climate change could make flatback turtle population be born all female or die out, scientist warns
By Jane Bardon
The members of one of the Northern Territory’s largest flatback turtle populations could all be born female in less than 15 years if rising temperatures continue unabated, a leading Australian turtle scientist says.
The Honorary Fellow of Charles Darwin University and head of AusTurtle has used sand probes to monitor the rise in nest sand temperatures over the decades on the island and at other sites, including Ashmore Reef.
The sex of hatchlings is determined by the sand temperature of their nests, and in 2016 all the Bare Sand Island nests were too hot to produce any males.
“If the temperatures are below about 29.5 degrees [Celsius] we have a male turtle, if it’s above 29.5C you’re going to have a female turtle,” Dr Guinea said.
“And if you have a rise above about 33C to 34C, you start getting into lethal temperatures.”
Dr Guinea said by 2030, all of Bare Sand Island’s flatback hatchlings could be born female.
But he still hoped some nesters would seek out cooler beaches.
“We might find that further south, the turtles are actually having better success there, they could be the saviours for the population,” he said.
I live near a flatback turtle nesting site, at the right time of year the beaches are thick with them – around 1,500 miles south of the “endangered” colony. At the right time of year the beaches are covered with hatchlings. Somehow I suspect the strategy of moving south a little in response to global warming is working out.
via Watts Up With That? https://ift.tt/1Viafi3