A new study published in the journal Science by an international team reveals that historical fluctuations in atmospheric CO2 levels and the subsequent alterations in climate and vegetation were significant factors influencing when and where early human species interbred. Modern-day humans posses
Photo of the remaining Denisova 11 bone fragment from Denisova Cave in Russia, that comes from a daughter to a Neanderthal mother and a Denisovan father.
[Slon et al. 2018]. Denny, along with fellow mixed-ancestry individuals found at Denisova cave, testifies that interbreeding was probably common among hominins, and not limited to our own speciesTo unravel when and where human hybridization took place, scientists usually rely on paleo-genomic analysis of extremely rare fossil specimens and their even scarcer ancient DNA content.
“This means that their habitats of choice were separated geographically, with Neanderthals typically preferring southwestern Eurasia and Denisovans the northeast,” says Dr. Jiaoyang Ruan, a postdoctoral researcher at theHowever, according to their realistic computer simulations, the scientists found that in warm interglacial periods, when Earth’s orbit around the Sun was more elliptic and northern hemisphere summer occurred closer to the Sun, the hominin habitats began to overlap geographically.
To further determine the climate drivers of the east-west interbreeding seesaw, the scientists looked more closely at how vegetation patterns changed over Eurasia during the past 400 thousand years. They discovered that elevated atmospheric COconcentrations and mild interglacial conditions caused an eastward expansion of temperate forest into central Eurasia which created dispersal corridors for Neanderthals into Denisovan lands.
日本 最新ニュース, 日本 見出し
Similar News:他のニュース ソースから収集した、これに似たニュース記事を読むこともできます。
Climate Week NYC: Large cities are at the forefront of climate change, experts sayAmerica's largest cities are at the forefront of climate change.
続きを読む »
Climate Week NYC: news and protests surrounding the UN Climate Ambition SummitThe Verge is on the ground at the biggest protests and events.
続きを読む »
AOC, Markey Introduce Bill to Establish New Deal-Inspired Civilian Corps to Combat Climate CrisisA Civilian Climate Corps would mobilize the U.S. workforce in the fight against the climate crisis.
続きを読む »
Letter: Education shifts perspective on Sask. pronoun policy for kidsA reader says her support for a Saskatchewan policy requiring parental consent for name and pronoun changes vanished after some research.
続きを読む »