99% female

You may have seen Australia’s high temperatures in the news, reaching 117 degrees F this past week.  Obviously, this is harmful for agriculture long term, and will worsen drought and the fire season.  It also spells trouble for wildlife.  Bats have basically boiled to death, falling from trees.  Bats help control insect populations.

The Great Barrier Reef is also suffering, with coral bleaching.  Sea turtles are showing evidence of the climate change strain…scientists were surprised to discover 99% of this year’s hatchlings were female.   This gender bias is due to the high temperatures.

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(Photo of a turtle in my hometown)

Clearly, if this is a long term trend, and it looks like it will be, populations of sea turtles will become endangered.  Other animals like crocodiles and certain lizards also have gender determined based on temperature.

According to NBC News:

There are also some “practical” intervention methods scientists can take to help relieve the gender bias, such as putting up shade tents around breeding sites or spraying artificial rain to cool sand temperatures, O’Gorman said.

Holleley said that while short-term intervention could help populations, it could also have unintended outcomes and potentially make the population more vulnerable if those intervention methods were suddenly taken away because of funding or changes in administrations.

“You’re kind of in a Catch-22, do you intervene and potentially have an adverse outcome as an unintended consequence,” she said, “or do you let the population be and see what happens — it’s very difficult.”

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