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Evolution


A Collection of News by Moos

Evolution in the news, articles that stood out and caught my attention.

Moos

 

Mystery of how first animals appeared on Earth solved, say researchers

published 20 August 2017 | modified 20 August 2017

new

Oil droplet molecules ancient organismsResearch led by the Australian National University (ANU) has solved the mystery of how the first animals appeared on Earth, a pivotal moment for the planet without which humans would not exist.

Lead researcher Associate Professor Jochen Brocks said the team found the answer in ancient sedimentary rocks from central Australia. "We crushed these rocks to powder and extracted molecules of ancient organisms from them," said Dr Brocks from the ANU Research School of Earth Sciences. "These molecules tell us that it really became interesting 650 million years ago. It was a revolution of ecosystems, it was the rise of algae."

Dr Brocks said the rise of algae triggered one of the most profound ecological revolutions in Earth's history, without which humans and other animals would not exist. The researchers’ discovery is published online on 16 August in Nature.

Snowball Earth
"Before all of this happened, there was a dramatic event 50 million years earlier called Snowball Earth," he said. "The Earth was frozen over for 50 million years. Huge glaciers ground entire mountain ranges to powder that released nutrients, and when the snow melted during an extreme global heating event rivers washed torrents of nutrients into the ocean."

Dr Brocks said the extremely high levels of nutrients in the ocean, and cooling of global temperatures to more hospitable levels, created the perfect conditions for the rapid spread of algae. It was the transition from oceans being dominated by bacteria to a world inhabited by more complex life, he said.

"These large and nutritious organisms at the base of the food web provided the burst of energy required for the evolution of complex ecosystems, where increasingly large and complex animals, including humans, could thrive on Earth," Dr Brocks said.

Co-lead researcher Dr Amber Jarrett discovered ancient sedimentary rocks from central Australia that related directly to the period just after the melting of Snowball Earth. "In these rocks we discovered striking signals of molecular fossils," said Jarrett.

We immediately knew that we had made a ground-breaking discovery that snowball Earth was directly involved in the evolution of large and complex life.

Dr Jarrett, an ANU Research School of Earth Sciences PhD graduate

 

(Source: ANU news release, 17.08.2017)


 

Goal: 7000 tigers in the wild

Tiger range countries map

 

"Tiger map" (CC BY 2.5) by Sanderson et al., 2006.

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