Friday April 19, 2019
Home World Original Amer...

Original Americans came from Siberia 23,000 years ago, study reveals

0
//
picture from- siberiamissionary.org

New York: The first people to reach the Americas came from Siberia, now in Russia, in a single group around 23,000 years ago, at the height of the last Ice Age, says a new study.

picture from- www.offroadexpedition.com
picture from- www.offroadexpedition.com

After reaching Alaska, they apparently hung out in the north – perhaps for thousands of years – before spreading throughout North and South America, said the study based on genomic analysis.

The findings dispel the popular idea that Polynesians or Europeans contributed to the genetic heritage of Native Americans.

The study revealed that the the first people to reach the Americas used a land bridge between Siberia and Alaska called Beringia.

“There is some uncertainty in the dates of the migration and the divergence between the northern and southern Amerindian populations. But as we get more ancient genomes sequenced, we will be able to put more precise dates on the times of migration,” said one of the study authors Yun Song, associate professor at University of California, Berkeley.

The analysis, using the most comprehensive genetic data set from Native Americans to date, was conducted using three different statistical models.

The data consisted of the sequenced genomes of 31 living Native Americans, Siberians and people from around the Pacific Ocean, and the genomes of 23 ancient individuals from North and South America, spanning a time between 200 and 6,000 years ago.

The international team concluded that the northern and southern Native American populations diverged between 11,500 and 14,500 years ago.

The southern branch peopled Central and South America as well as part of northern North America. The findings will be presented in the forthcoming issue of the journal Science.

“The diversification of modern Native Americans appears to have started around 13,000 years ago when the first unique Native American culture appears in the archaeological record: the Clovis culture,” said Rasmus Nielsen, a professor at the California university.

“We can date this split so precisely in part because we previously have analysed the 12,600-year-old remains of a boy associated with the Clovis culture,” Nielsen added.

(IANS)

Next Story

Whooping Cranes, Ravens, Peregrine Falcons are Celebrities of Sky in Eyes of Americans: Study

The ruffed grouse or purple martin? They're like friends you might chat with. The wrentit and the Abert's towhee are like the neighbors you don't talk to much

0
whooping cranes
FILE - An adult whooping crane, a critically endangered species, is seen in captivity at the Audubon Nature Institute's Species Survival Center in New Orleans, June 21, 2018. VOA

Whooping cranes, common ravens and peregrine falcons are among the celebrities of the sky in the eyes of Americans, even those who’ve never laid eyes them.

The ruffed grouse or purple martin? They’re like friends you might chat with. The wrentit and the Abert’s towhee are like the neighbors you don’t talk to much. As for the Hammond’s flycatcher and the Brewer’s sparrow, Americans don’t care much about them at all.

That’s the word from a new study that aimed to define “a range of relationships between people and birds” across the United States, said Justin Schuetz, one of the authors.

Results appear in a paper released Monday by the Proceedings of the National Academy of Science. Schuetz, a biologist and independent researcher in Bath, Maine, did the work with Alison Johnston, who’s affiliated with Cornell University in Ithaca, New York.

whooping cranes, ravens
Birds classified as “neighbors,” whose few Google searches were confined to where they live. VOA

The project included studying Google searches performed from 2008 to 2017 to learn about what Americans think about 621 bird species. Researchers knew where each search came from. They also knew the natural range of each species and how often it is sighted in specific places, based on a national database.

One key question was whether the Google data revealed more interest in each species than one would expect in various locations, based on how often it is sighted in those places. Another question was how much the interest in each species was limited to its natural range, or spilled out beyond it.

So birds in the “celebrity” category are those that attracted more Google attention than one would expect from how often they’re seen, and whose popularity extended outside of their natural range. They have “a reputation beyond where they live,” Schuetz explained.

Next came the “friends or enemies” category, which included species that get more Google attention than expected, but mostly in the states where they live. As with the other categories, the researchers couldn’t tell whether the searchers’ opinions of these familiar birds were positive or negative.

Then came birds classified as “neighbors,” whose few Google searches were confined to where they live. Finally there were the “strangers,” birds that got little Google interest anywhere.

whooping cranes
Jeffrey Gordon, president of the American Birding Association, called the study “a fascinating framework for trying to understand how people are relating to birds.” VOA

The research also turned up other insights into what makes a species popular. Bigger bodies, colorful plumage and regular visits to birdfeeders helped. Species that served as mascots for professional sports teams reached celebrity status, but it wasn’t clear whether being a mascot encouraged popularity or the other way around.

The results also turned up some surprises. “People seem to have an inordinate fascination with owls we couldn’t account for entirely in our analysis,” Schuetz said. Jeffrey Gordon, president of the American Birding Association, called the study “a fascinating framework for trying to understand how people are relating to birds.”

ALSO READ: Scientists Found Prime Lakeside Property on Saturn’s Moon Titan but with Liquid Methane

“I hope they’re able to use it to help people appreciate what’s right in their own backyard,” he said. “Most of us just aren’t keyed in to what is literally at our doorstep. “David Ringer, chief network officer for the National Audubon Society, also found the work interesting.

“It’s great to see how much we know and love some species, and it’s provocative to see how much we still have to discover,” he wrote in an email. “I hope that many bird `strangers’ will become `friends,’ and `neighbors’ will turn into `celebrities.” (VOA)