Robin McKie

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Human ambitions are deadly, perhaps for ourselves, and certainly for other species. But did our mere presence, even before industrialization and digitalization and globalization, kill off some of the planet’s most impressive creatures? The opening of Robin McKie’s Guardian piece, “What Killed Off the Giant Beasts – Climate Change or Man?“:

“They were some of the strangest animals to walk the Earth: wombats as big as hippos, sloths larger than bears, four-tusked elephants, and an armadillo that would have dwarfed a VW Beetle. They flourished for millions of years, then vanished from our planet just as humans emerged from their African homeland.

It is one of palaeontology’s most intriguing mysteries and will form the core of a conference at Oxford University this week when delegates will debate whether climate change or human hunters killed off the planet’s lost megafauna, as these extinct giants are known.

‘Creatures like megatherium, the giant sloth, and the glyptodon, a car-sized species of armadillo, disappeared in North and South America about 10,000 years ago, when there were major changes to climates – which some scientists believe triggered their extinctions,’ said Yadvinder Malhi, professor of ecosystem science at Oxford, one of the organisers of the conference, Megafauna and Ecosystem Function.

‘However, it is also the case that tribes of modern humans were moving into these creatures’ territories at these times – and many of us believe it is too much of a coincidence that this happened just as these animals vanished. These creatures had endured millions of years of climate change before then, after all. However, this was the first time they had encountered humans.'”

 

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The idiosyncratic geneticist Svante Pääbo, whose new book has just been published, has taught us much about our ancient roots, our ties to Neanderthals and Denisovans. From Robin McKie’s Guardian profile of Pääbo, a passage about the scientist’s research on the former:

“His results provided a shock for both researchers and the public. When he compared his newly created Neanderthal genome with those of modern humans, he found a small but significant overlap in many of them. About 2% of Neanderthal genes could be found in people of European, Asian and far eastern origin. People from Africa had no Neanderthal genes, however. ‘This was not a technical error of some sort,’ Pääbo insists. ‘Neanderthals had contributed DNA to people living today. It was amazingly cool. Neanderthals were not totally extinct.’

Most scientists, including Pääbo, now account for this result by arguing that modern humans – when they first emerged from Africa – encountered and mated with Neanderthals in the Middle East. Their offspring carried some Neanderthal genes and as modern humans swept through Asia and Europe they carried these genes with them.

neanderthalstampThe revelation that many humans possess Neanderthal genes fascinated the public. Dozens of individuals have since written to Pääbo claiming to be full Neanderthals. Intriguingly, nearly all of them have been men. The only women who wrote did so to say they thought their husbands were Neanderthals. ‘I think that says a lot about our image of Neanderthals,’ says Pääbo.

Just what that input of Neanderthal DNA has done for Homo sapiens’s evolution is less clear. Pääbo speculates that changes in sperm mobility and alterations in skin cell structure could be involved. In addition, US researchers have recently proposed that Neanderthals passed on gene variants that may have had a beneficial effects in the past but which have now left people prone to type 2 diabetes and Crohn’s disease. ‘This is work that is going to go on for years,’ he adds.”

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