2021-10-31

DNA from ancient times reveals how the ancestors of modern domestic horses migrated

By yqqlm yqqlm

Visit: Alibaba cloud 11.11 shangyun Carnival activity hall 2021 tmall double 11 red envelope Jingdong double 11 “top Beijing Post” collection entrance

5b3b6f6722bcec6 - DNA from ancient times reveals how the ancestors of modern domestic horses migrated

Dmitry jimlanov, senior researcher of the Ural branch of the Russian Academy of Sciences and the Ural Federal University (Russia), said: “We found that the Bellinger land bridge, or the area known as Beringa, affected the genetic diversity of horses both internally and externally. “Due to the emergence of this land part, gene flow among mammoths, bison and wolves may occur frequently. If horses from North America had not spread widely in Eurasia 1.8 million years ago, the two-way transmission distance of genes was a little far between 950000-450000 years ago and 200000-500000 years ago.”

in other words, the migration of horses between continents is not only one-way, but also in the opposite direction. The first wave of migration is mainly from North America to Eurasia. The second migration is mainly from Eurasia to North America

the most important researchers concluded that most animals used the belingia land bridge only once, while horses used it several times. This fact may greatly affect the genetic structure of horses and make them very interesting research objects for paleogeneticists

in order to determine the settlement area of horses, molecular biologists studied the DNA of horses from two continents. From 262 bone and tooth samples, they selected 78 samples with enough DNA. The researchers performed radiocarbon assays and genetic analysis in laboratories in Denmark and the United States. In addition, they looked at the research data of 112 samples

“the data show that the time for horses to cross the Bering Strait from Eurasia to return to North America is similar to that of bison, brown bear and lion,” said Dmitry jimlanov. In other words, in the last “days” of the late Pleistocene, when the territory was not covered by water, it was like a bridge for many animal groups to move. With the beginning of climate warming (the beginning of the Holocene or 11700 years ago) And the last disappearance of the Bering Strait at the end of the Pleistocene, the biogeographic significance of this ecological corridor has fundamentally changed the history of terrestrial animal species on the two continents

although the North American horses eventually became extinct in the early Holocene, due to domestication, horses were common on both continents, and now the horses found have far exceeded their historical scope