Darwin’s Dark Knight: Scientist Risked Execution for Fox Study (Op-Ed)

[Buster's Uncle]

Darwin’s Dark Knight: Scientist Risked Execution for Fox Study (Op-Ed)
LiveScience.com
Brian Hare, Duke University  22 hours ago  Science, Social Science, & Humanities

One of Dmitri Konstantinovich Belyaev's domesticated foxes.

Brian Hare is an evolutionary anthropologist at Duke University and the founder of Dognition, a website that helps you find the genius in your dog. This post was an adaptation from his book "The Genius of Dogs," co-authored with Vanessa Woods (Dutton, 2013). He contributed this article to LiveScience's Expert Voices: Op-Ed & Insights.

Today (July 17) is the birthday of one of the most important scientists you've probably never heard of — Dmitri Konstantinovich Belyaev. In the chokehold of Stalin's Russia, where being a geneticist was likely to get you imprisoned, shot or both, Belyaev conducted perhaps the greatest genetics experiment of the 20th century and finally solved the puzzle of how the wolf turned into the dog.

For almost a century, Darwin's biggest idea had a hole in it. To illustrate natural selection, Darwin did not directly suggest that humans shared a common ancestor with apes. Instead, he used a concept that everyone was familiar with — domestication. Everyone knew that you could selectively breed dogs for certain physical characteristics, like size or coat color. Darwin wanted to stretch this idea a little further and suggest that instead of a human hand, it was natural selection that drove evolution.

The problem was that Darwin could not say how domestication started in the first place. No one was taking notes while the first wolf  changed into a dog, or a wild boar into a pig. This is where Belyaev stepped in and quietly began a Herculean task that no one would have thought possible — he domesticated a species from scratch.

After World War II was not a good time to be a geneticist in Russia. Darwinism was seen as a justification that capitalists should have millions and workers live in poverty because the capitalists had superior strength or intelligence. In 1948, genetics was banned in Russia. Genetic institutions were closed and information on genetics was removed from textbooks. Punishment for carrying on genetic work was swift and severe. Belyaev's own brother, a geneticist, was arrested by the secret police and shot without trial.

This fox looks similar to the wild foxes Dmitri Konstantinovich Belyaev bred in his genetics experiments.

Belyaev began his experiment with the silver fox, because he could disguise his work as a commercial endeavor. Silver foxes were prized in Russia for their fur, and Belyaev's official research objective was trying to breed foxes for better fur.

Instead of trying to create a domesticated species by selecting for each physical trait, Belyaev selected for one simple behavioral trait — whether the foxes would approach a human hand.

After only 45 generations, the experimental foxes began to change in ways that might take thousands if not millions of years in the wild. By the time I arrived years later to see the ongoing work, Belyaev's experimental foxes were radically different from their control population. They had smaller skulls and canine teeth. Their coats were splotchy and their tails were curled. They also had floppy ears and barked.

When I met the bred foxes for the first time, one jumped in my arms and licked my face. The difference between the experimental and the control foxes were remarkably like the differences between wolves  and dogs.

Belyaev had done it. He had taken a population of wild animals and essentially domesticated them. And not just that, he had figured out the mechanism by which it happened — not by intentionally breeding for each physical trait, but by selecting only for behavior. That is, by allowing to breed those animals that were friendly toward people.

Wolves transitioned into dogs — right down to the floppy ears and wagging tails — as they adapted to closer relationships with humans.

There was one more change I was interested in when I tested the foxes in 2004. My team's previous research had shown that dogs are remarkable at reading human communicative gestures. Dogs were better than wolves, and better than even humans' closest living relatives, chimpanzees . The question was whether Belyaev's foxes would share this talent for reading human gestures.

They did. This had huge implications to how scientists think about the domestication of dogs. The most common assumption is that some hunter-gatherer with a soft spot for cuteness found some wolf puppies and adopted them.

Instead, the foxes raise the real possibility that natural selection may have shaped wolves into the first proto-dogs in a very similar way without intentional human intervention or control. Ray Coppinger of Hampshire College and others have speculated that as humans began forming more permanent settlements over the last 15,000 years, a new canine food source appeared that led directly to the evolution of the dogs we know and love — garbage.

Only those wolves who were least fearful and nonaggressive toward humans would be able to take advantage of that new source of food. It would not have taken many generations for those friendlier wolves to undergo physical changes, like coat color. Soon, the wolves stopped looking like wolves. Many would have splotchy coats, and some would have even had floppy ears or a curly tail. Like the foxes, they too accidentally became more skilled at responding to the behavior of humans, and a new relationship began.

It's not always easy being an evolutionary biologist in this day and age. But whenever I start feeling sorry for myself, I think of Belyaev, working undercover with death never far from his door. Belyaev's quiet heroism is something to aspire to, and although the true magnitude of his discoveries was not realized until after his death in 1985, his work was an invaluable contribution that will have implications far into the future.

http://news.yahoo.com/darwin-dark-knight-scientist-risked-execution-fox-study-201633622.html

[JarlWolf]

Ah, good old Dr.Belyaev, I had a friend, a fellow student who knew someone who worked with him before. Belyaev was instrumental to our knowledge about domestication and there is a brave little theory where as he stated (and I concurrently agree to) that domestication results in not only a change of behavior in animals, but also physical traits through genetic disposition related to behaviour. Wolves that were less aggressive and more submissive were able to get closer to humans, and thus over time humans grew accustomed with them and eventually, acquainted. And the said descendants of these wolves changed pigment of their fur as well as grew more playful in nature, and became more loud and less stealthy, but more useful to us and therefore they evolved and have survived because we adopted them as companions.

And his experiments showed striking behavioral changes within foxes (and other experiments with other animals were evident of this as well) that breeding the more submissive animals would create more domesticated forms of the animal: Not just behavioral wise but physically too. This experiment has been done with rats, the same population of rats were all collected and within 30 years there was two breeding camps: The most aggressive animals were bred with each other and the more docile ones bred together. Seperated by this the two camps had remarkable differences, the aggressive rats were so rabid, fearful and paranoid they would jump and ravenously try to attack the handlers even before they opened the cage, and the docile rats were so calm and comfortable with people that you could pick one up and it wouldn't even care much. Not only that the more vicious rodents exhibited darker fur patterns and the peaceful ones were lighter and more obvious to spot in tone.