The Coevolution of Humans and Dogs | Shield My Pet
Some think early human hunter-gatherers actively tamed and bred dogs, and built a family tree that revealed the relationships between . This ancient DNA has done wonders for our understanding of our own evolution. Dogs today evolved from wolves who first developed a relationship with and hunting assistance since the days of the earliest human settlements. how the relationship between humans and wolves developed, and how. A genetic study indicates that dogs may have begun to split from wolves " Another is that early humans simply caught wolf cubs and kept them as pets of the relationship between dogs and humans that has developed and.
During the Last Glacial Maximum there were two types of wolf. The cold north of the Holarctic was spanned by a large, robust, wolf ecomorph that specialised in preying on megafauna. Another more slender form lived in the warmer south in refuges from the glaciation. When the planet warmed and the Late Glacial Maximum came to a close, whole species of megafauna became extinct along with their predators, leaving the more gracile wolf to dominate the Holarctic.
The more gracile wolf was the ancestor of the modern gray wolf, which is the dog's sister but not its ancestor as the dog shows a closer genetic relationship to the now-extinct megafaunal wolf. Two wolf haplogroups Evolutionary divergence DNA evidence indicates that the dog, the modern gray wolf above and the now-extinct Taimyr wolf diverged from a now extinct wolf that once lived in Europe. The date estimated for the evolutionary divergence of a domestic lineage from a wild one does not necessarily indicate the start of the domestication process but it does provide an upper boundary.
The divergence of the domestic horse from the lineage that led to the modern Przewalski's horse is estimated at 45, YBP but the archaeological record indicates 5, YBP. The variance could be due to the modern wild population not being the direct ancestor of the domestic one, or the impact of a split due to climate, topography, or other environmental changes.
The divergence time does not imply domestication during this specific period.
Origin of the domestic dog - Wikipedia
The sample provided the first draft genome from the cell nucleus of a Pleistocene carnivore and the sequence was identified as belonging to Canis lupus. The sequence indicated that the Taimyr-1 lineage was separate to modern wolves and dogs. Using the Taimyr-1 specimen's radiocarbon date in addition to its genome sequence compared to that of a modern wolf, a direct estimate of the mutation rate in dogs and wolves could be made to calculate the time of divergence.
The study calculated a mutation rate for the 7, YBP Neolithic dog and found that it matched the mutation rate of the Taimyr-1 specimen, and noted that this also matched the mutation rate for the Newgrange dog that had been calculated in an earlier study. Using the 7, YBP specimen and this mutation rate, the dog-wolf divergence time is estimated to have occurred 36, YBP and this is consistent with the timing found with the Taimyr-1 specimen in an earlier study.
The study identified six major dog yDNA haplogroups, of which two of these include the majority of modern dogs.
The Newgrange dog fell into the most commonly occurring of these haplogroups.
Researcher explores close prehistoric relationship between humans and dogs
The two ancient German dogs fell into a haplogroup commonly found among dogs from the Middle East and Asia, with the Kirschbaum dog sharing a common male lineage with the extant Indian wolf. The study concluded that at least 2 different male haplogroups existed in ancient Europe, and that the dog male lineage diverged from its nearest common ancestor shared with the gray wolf sometime between 68, YBP.
Studies of modern grey wolves have identified distinct sub-populations that live in close proximity to each other. However, the geographic origin of this radiation is not known. Where the genetic divergence of dog and wolf took place remains controversial, with the most plausible proposals spanning Western Europe,   Central Asia,   and East Asia.
Ina study of the maternal mitochondrial genome indicated the origin in south-eastern Asia south of the Yangtze River as more dog haplogroups had been found there.
- How Dogs Evolved Into 'Our Best Friends'
- Human–canine bond
- Origin of the domestic dog
Ina study using single nucleotide polymorphisms indicated that dogs originated in the Middle East due to the greater sharing of haplotypes between dogs and Middle Eastern gray wolves, else there may have been significant admixture between some regional breeds and regional wolves. Ina study of maternal mDNA indicated that the dog diverged from its ancestor in East Asia because there were more dog mDNA haplotypes found there than in other parts of the world,  but this was rebutted because village dogs in Africa also show a similar haplotype diversity.
Then, one of these lineages migrated back to northern China and admixed with endemic Asian lineages before migrating to the Americas.
Human–canine bond - Wikipedia
Ina study looked at 85, genetic markers of autosomalmaternal mitochondrial genome and paternal Y chromosome diversity in 4, purebred dogs from breeds and village dogs from 38 countries. Some dog populations in the Neotropics and the South Pacific are almost completely derived from European stock, and other regions show clear admixture between indigenous and European dogs. The indigenous dog populations of Vietnam, India, and Egypt show minimal evidence of European admixture, and exhibit indicators consistent with a Central Asian domestication origin, followed by a population expansion in East Asia.
The study could not rule out the possibility that dogs were domesticated elsewhere and subsequently arrived in and diversified from Central Asia. Studies of extant dogs cannot exclude the possibility of earlier domestication events that subsequently died out or were overwhelmed by more modern populations. Even as they get older, they retain traits that wolves outgrow. For example, wolf babies look very cute.
They have big eyes and smaller faces.Mankind The Story of All of Us: Domesticating the Dog - History
They are likely to run about and even bark. But as they get older, their faces grow and they grow into their eyes and ears. They lose the baby fat and stop barking. Human Dog Communication As dogs evolved from ancient wolves to domesticated animals, they learned to communicate with humans. Your dog probably knows his name.
He might be able to recognize certain words. In the study, 16 dogs watched videos of a woman. She was indicating two different containers. In the first video, she looked at the dogs and spoke to them in a high pitched tone. The dogs spent the same amount of time looking at the woman when watching either video.
But they also watched the container she was pointing to when she spoke to them in the higher pitched voice. A higher voice indicates to dogs that a person is speaking to them and trying to convey some sort of information. In this case, the dogs perhaps thought the woman was telling them something about the container.
In the early days of human-dog interaction, being able to communicate had particular benefits. People were more likely to choose to live with dogs they could communicate with than with animals like the wild wolf. Dogs and Tools Another hypothesis concerning the domestication of dogs and coevolution of dogs and humans was the use of tools by people.
Learning to use tools, such as spears and knives, gave people a pretty distinct advantage over other animals. They were also able to prepare and process their prey more quickly. Since it took less time for a person to kill, skin and eat an animal with tools than before, people began to eat more meat. The more meat people ate, the smaller their social circles needed to become, so that there would be enough food to go around. For that reason, humans began to spread across the earth and to move into previously unsettled lands.
Early dog ancestors most likely joined up with humans for two reasons. They were opportunists and saw a chance to be fed and cared for, as described above. Humans also might have found that the wolves provided them with an opportunity. Hunting became somewhat easier and more successful with a dog. Along with helping during a hunt, these early dogs could have served as a sort of protection system. The dogs could bark to alert the humans when a stranger or large predator approached a home or settlement, for example.
Diet, Dogs and People As dogs and people continued to live together, they continued to evolve together. One of the major changes experienced by both humans and dogs was the addition of starches to their diets. But as humans switched from hunter-gatherers to farmers, they began to cultivate and eat grains. So did their four-legged companions. According to a study conducted in Sweden inmodern dogs have genes for digesting starches and grains that modern wolves lack.
The first of these genes breaks down complex carbohydrates. The second gene splits the simple carbs into sugars. The third gene allows the intestines to absorb the sugar. Would dogs have been able to co-exist and live with humans had they not developed those genes? The Swedish researchers think not. Modern humans have more copies of the gene for amylase than the earliest people.
Dogs have also developed more copies of the amylase gene. Wolves have just two copies, dogs can have as many as Amylase is the enzyme that triggers the breakdown of starches. While humans and dogs have both increased production of the amylase gene, their coevolution diverges somewhat. Human saliva contains amylase and starts the digestion process in the mouth. Instead, they to swallow their food before digestion can start. Speech and Meaning Dogs and people both process word meanings using the left side of their brains.
Meanwhile, the right side of the brain is active when people and dogs are detecting emotion or tone. Researchers suspect that other mammals also have the ability to detect word meanings. But dogs tend to be the easiest subjects to test.