Almost the Ice Age again!

Just joking!

I was thinking yesterday morning that it was about time for me to publish a post.

Tuesday was a busy day with us in the morning going to collect the tractor from Runaway Tractors where it had been in for a service. Then in the afternoon I decided to go for a bike ride, something I try and do every other day. It was grand and I clocked up 18 miles.

The forecast for Wednesday was grim. And we awoke to a morning with much land covered in snow.

Looking to the North-East.

So my item that I wanted to republish from The Smithsonian Magazine seemed apt. It is about the history of dogs.

ooOOoo

How Dogs Migrated to America From Ice Age Siberia 15,000 Years Ago

Northern Siberians and ancestral native Americans may have traded pups at the time

By Elizabeth Gamillo
SMITHSONIANMAG.COM
FEBRUARY 1, 2021

All dogs with the genetic signature A2b descended from the same Siberian canines roughly 23,000 years ago (Jim Peaco; Photo has been cropped for article purposes by ZeWrestler, Public domain, via Wikimedia Commons)

Dogs have been companions to humans for many millennia, but exactly when this relationship started is highly debated among scientists.

A study published this week in the Proceedings of the National Academy of Sciences reveals that canine domestication may have first occurred in Siberia 23,000 years ago when humans and wolves were isolated together during the Last Glacial Maximum. After this initial domestication event, dogs most likely followed humans when they migrated across the Bering Land Bridge from East Asia to the Americas 15,000 years ago, reports Megan Marples for CNN.

“Wolves likely learned that scavenging from humans regularly was an easy free meal, while humans allowed this to happen so long as wolves were not aggressive or threatening,” Angela Perri, an archaeologist at Durham University and lead author of the study tells CNN.

The study was brought to fruition after Perri and her co-authors—David Meltzer, an archeologist at Southern Methodist University, and Gregor Larson, a scientist from Oxford University—were brainstorming how DNA evidence tells the story of migrating humans and dogs, reports James Gorman for the New York Times. After the authors scribbled down ideas on a whiteboard, they saw that both humans and canines had similar migration patterns and divergence that could explain how dogs and humans began their bond, reports the New York Times.

To see if the similarities between the timelines linked up with archeological evidence, Perri and her team analyzed the genome of 200 ancient dogs from around the world. They found that the canines had one genetic signature, A2b, in common. Once they reached the New World 15,000 years ago, they dispersed into four groups, reports David Grimm for Science.

The researchers found this dispersal matched a similar migration pattern of ancestral Native Americans that descended from Northern Siberia about 21,000 years ago. Connecting these timeline events between humans and dogs, the researchers concluded that humans must have brought dogs into the Americas somewhere around 15,000 years ago.

“Dogs are not going to go to the new world without people,” Meltzer tells the New York Times.

Further exploring the dogs’ genetic evidence, the team found all dogs with the genetic signature A2b descended from the same Siberian canines roughly 23,000 years ago, Science reports.

Looking back at human’s ancestral timeline and genetic evidence, the researchers found that ancient Northern Siberians intermingled with ancestral Native Americans before crossing the land bridge into the Americas. These meetings could have resulted in the two groups of people trading pups.

“People are exchanging information, they’re exchanging mates, they’re maybe exchanging their wolf pups,” Meltzer tells the New York Times.

While there is strong evidence that the initial domestication event occurred 23,000 years ago, the study relied only on mitochondrial DNA and could be missing the complete picture of domestication events, explains Pontus Skoglund, an ancient canine DNA expert from Crick Institute in London who was not involved in the study, to the New York Times. Likewise, Peter Savolainen, a geneticist at the Royal Institute of Technology, tells Science that the A2b signature has been found in other places in the world and is not unique to dogs in the Americas as the researchers suggested.

Still, the study reveals how the relationship between humans and dogs may have begun and how it may have dispersed across the globe. Perri and her team plan on looking at older dog fossils to gather more evidence.

“We have long known that the first Americans must have possessed well-honed hunting skills, the geological know-how to find stone and other necessary materials and been ready for new challenges,” Meltzer tells Peter Dockrill for Science Alert. “The dogs that accompanied them as they entered this completely new world may have been as much a part of their cultural repertoire as the stone tools they carried.”

ooOOoo

There is a huge number of dogs throughout the world. The exact figure is impossible to determine. Here’s an extract from WoofDog’s piece on the global population:

Determining the exact number of pups that inhabit our planet is a bit of a challenge. The fact that many of them live on their own, rather than side by side with people, presents the main obstacle to providing accurate figures.

According to 2012 data, there were around 525 million canines in the world. This figure has grown considerably until the present day, so today, it is estimated to be about 900 million pooches.

And from the same website, here is an estimate of the global population of owned dogs:

Statistics related to canine ownership vary across different countries. Nevertheless, the task of calculating the number of canines owned by people around the globe is far less complicated than it is the case with free-range ones.

The reason for this lies in the fact that many countries have introduced legal regulations on mandatory registration of household animals.

My analysis is that the USA is second in the league of owned dogs.

But wherever there are dogs they are a rich and bountiful addition to the ambitions of humans.

4 thoughts on “Almost the Ice Age again!

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