Thousands of years ago, American dogs mysteriously vanished
09 Juillet, 2018, 15:25 | Auteur: Yves Courtet
A new study out this week in Science seems to better illuminate one of these detours.
These dogs persisted for thousands of years in the Americas, but nearly completely vanished after European contact, the researchers found.
Dozens of researchers collaborated for the expansive study.
Scientists sequenced the genomes of ancient dogs using both mitochondrial DNA genes inherited from both parents, and mitochondrial DNA, genes passed from mothers to their offspring. Namely, that the first dogs came to the Americas more than 10,000 years ago, across the Bering land bridge, or Beringia, that connected North America and Asia.
Linderholm, who directs the BIG (bioarchaeology and genomics lab) at Texas A&M and who did much of the genome work, said, "The sudden disappearance of dogs in America was probably associated with European colonization, but we don't know the details yet".
The oldest evidence for dogs in the Western Hemisphere dates back about 10,000 years, some 6,500 years after the first humans arrived.
The new study dispelled a previous theory about the origin of dogs in the Americas, which posited that they evolved from domesticated wolves. Evidence that these dogs were used in sledding, along with suggestions that they were used for hunting and hauling, means that they could have facilitated the early settlement of the Americas.
A new study sheds light on the history of dogs and their role in human life, though many mysteries remain. Instead, they realized that the native dogs had virtually vanished.
It appears that native dog populations could have been wiped out through a number of causes, including disease, persecution and Europeans' desire to raise their own breeds.
Fernando Hierro steps down as Spain manager
The 50-year-old has made a decision to turn down his former role, despite being still under contract with the Spanish FA (RFEF). Fernando Hierro has quit his role as sporting director of the Spanish FA following the round-of-16 exit at the World Cup.
While some American dogs might have been wiped out by epidemics or purposefully killed by Europeans, as indigenous people often were, there are likely other reasons for their demise. Did they intermix with dogs brought by European settlers? Pre-contact dogs were present as the first travellers journeyed from Siberia into the Americas and began to thrive.
In a paper published Thursday in Science, an worldwide team of archaeologists and geneticists report that.
"The picture is not as clear as they want it to be", Peter Savolainen, an associate professor in Evolutionary Genetics at the Royal Institute of Technology in Stockholm, told Gizmodo.
The researchers analyzed genetic material from 71 "pre-contact" dogs, whose remains spanned 9,000 years, and compared it with the DNA of 145 modern dogs.
Dog DNA taken from other ancient sites in the Americas not included in the study has also been found to have more similarities with the chihuahua and other South American breeds than this study did.
"It is fascinating that a population of dogs that inhabited many parts of the Americas for thousands of years, and that was an integral part of so many Native American cultures, could have disappeared so rapidly", senior lead author Laurent Frantz, a lecturer at Queen Mary University and co-investigator at the University of Oxford, said. But its DNA contains no trace of ancient dog DNA.
Raikkonen, who completed the podium for Ferrari , was handed a 10-second penalty for the early incident involving Hamilton. Both spun and rejoined, Hamilton after running off track. "I will not give up, believe me, I will not give up.
Hopefully we can learn as we go along. "That total isn't defendable when a guy comes out and plays like that on a small ground. However, preserving that impressive record will require India to find their best form against a resurgent England .
On Saturday morning, the Thai Navy posted photos of letters the group had written to their family and the outside world. She said rescuers have not been giving away how optimistic or pessimistic they are. but "it was clear they were tense".
Malgré l'intervention des pompiers , les trois enfants repêchés un peu plus tôt par les pompiers n'ont pas pu être ranimés. Une cellule psychologique a été mise en place par le personnel de l'hôpital pour épauler les proches des victimes.
Davis, la première ministre a salué sa contribution " à certaines des législations les plus importantes pour des générations ". Elle avait abouti à l'annonce d'un accord sur la volonté de maintenir une relation commerciale post-Brexit étroite avec l'UE.
En effet, avoir mille et une tâches à accomplir à la fois, ça peut avoir des effets négatifs. En effet, les travailleurs effectuent les tâches beaucoup plus rapidement tout en conservant leur qualité de vie.
Local governor Mehmet Ceylan told the NTV channel that helicopters had already taken numerous injured away from the scene. Another unnamed survivor told the private DHA news agency she was riding in one of the cars when it went off the tracks.
Mickelson has openly said that the two probably should have always gotten along this well, but they've "turned the corner". At a Players news conference, Mickelson proposed that the two simply play each other without anyone else on the course.
Embassy in Haiti has warned Americans to "shelter in place" amid violent protests that have rocked the nation over the weekend. However, the government's decision to back down did not keep angry residents from continuing to take to the streets.
William Dunlop Dies In Racing Accident
All at MCN join the wider racing community in expressing their heartfelt condolences to the Dunlop family at this time. Irish road racing star William Dunlop has been killed in a crash during practice for the Skerries 100 Race.
CdM 2018 : Deschamps évoque ses retrouvailles avec Henry
Son expérience en tant qu'adjoint pour l'équipe Belge avec son vécu est importante, " a confié le sélectionneur tricolore. Giroud, qui s'est joint à Chelsea depuis, reconnaît que, dans les médias, Henry devait " être un peu plus incisif ".
Grotte en Thaïlande. Les secours activent l'option forage
L'équipe de soccer est bloquée dans un complexe réseau souterrain long de plusieurs kilomètres, à l'accès très difficile. Le premier enfant libéré des profondeurs a pu être extrait de la grotte dimanche à 17h40 locales (10h40 GMT).
UK's Brexit Secretary David Davis has resigned
Mr Rees-Mogg refused to support her and said that "she would be well-advised to revisit her Brexit policy". They accuse May of backtracking on her professed red lines in the negotiations.