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Still Waters

Painted turtles set to become all-female

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Males don't stand a chance in a warmer world, if they happen to be painted turtles. A temperature rise of around 1 °C is all it would take for the species to become 100 per cent female and earmarked for extinction.

Painted turtles (Chrysemys picta), found in lakes and streams across North America, are one of many reptile species whose sex is determined by temperature. Eggs in warm nests are likely to hatch as females, while males hatch in cooler nests, although no one is sure why.

http://www.newscient...-allfemale.html

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Eggs in warm nests are likely to hatch as females. So a few males would still be born, they would have no competition in mating from males that would only hatch in cooler nests. So they would pass on the genetic difference that had allowed them to hatch in the warmer conditions.

But it would not come to that anyway since they are found in "lakes and streams across North America" and North America of course does not have a uniform temperature.

This part makes me laugh... "In recent years, many researchers have raised concerns that global warming could skew the sex ratios of these reptiles." I thought the fear mongers stopped using "global warming" years ago, now they call it "climate change". It was only a few decades ago (back in the 70s) when the big fear was global cooling.

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