Dramatic temperature drop led to mass extinction 35 million years ago: Scientists

The period of intense and rapid climate change occurred at the same time when Australia separated from Antarctica, scientists said.

Published: 24th March 2017 12:23 PM  |   Last Updated: 24th March 2017 12:23 PM   |  A+A-

Image used for representational purpose only. (File photo | ENS)

By PTI

MELBOURNE: Scientists have found the first evidence of mass extinction of Australian animals caused by a dramatic drop in global temperatures 35 million years ago. This period of intense and rapid climate change occurred at the same time when Australia separated from Antarctica.

Researchers from Australian National University (ANU) detected the mass extinction of pygopodoid geckos by using molecular evolutionary methods to examine fossil records. "The dramatic shift to colder and drier climates likely resulted in rapidly changing Australian habitats, which hugely impacted the animals that inhabited them," said lead researcher Ian Brennan, from the ANU Research School of Biology.     

"Our research provides evidence that rapid shifts in climate may have profound and long-lasting effects on global biodiversity," said Brennan. The findings also suggested the emergence and spread of deserts in Australia from about 10 million years ago provided ideal habitat for new pygopodoid gecko species to prosper. "Our findings suggest that arid regions of Australia have acted as a cradle for geckos, promoting the rich gecko diversity that is found across the continent," Brennan said.     

Co-researcher Paul Oliver said geckos did well in the harsh climates of arid Australia because they avoided the heat by being nocturnal. "Many desert geckos also have strategies and attributes to avoid water loss, such as having relatively rugged skin and scales," he said.     

"The clear scale over the eye, called a spectacle or brille, is one such example of this, as it helps them avoid water loss from the surface of the eye. But that means they can not blink, so they have to lick it clean. Underwoodisaurus and their relatives Nephrurus have little 'eyebrows' that stick out to keep dust and dirt off their eyes, because they're burrowing species," Brennan added.

The pygopodoid geckos are a group of about 150 species found across Australia. 

Stay up to date on all the latest World news with The New Indian Express App. Download now
(Get the news that matters from New Indian Express on WhatsApp. Click this link and hit 'Click to Subscribe'. Follow the instructions after that.)

Comments

Disclaimer : We respect your thoughts and views! But we need to be judicious while moderating your comments. All the comments will be moderated by the newindianexpress.com editorial. Abstain from posting comments that are obscene, defamatory or inflammatory, and do not indulge in personal attacks. Try to avoid outside hyperlinks inside the comment. Help us delete comments that do not follow these guidelines.

The views expressed in comments published on newindianexpress.com are those of the comment writers alone. They do not represent the views or opinions of newindianexpress.com or its staff, nor do they represent the views or opinions of The New Indian Express Group, or any entity of, or affiliated with, The New Indian Express Group. newindianexpress.com reserves the right to take any or all comments down at any time.

flipboard facebook twitter whatsapp