Human evolution: all those in the Denisovan cave (Introduction)

by David Turell , Thursday, June 24, 2021, 15:12 (1258 days ago) @ David Turell

At various stages Denisovans, Neanderthals and sapiens were there:

https://www.sciencemag.org/news/2021/06/ancient-siberian-cave-hosted-neanderthals-denis...

"A decade ago, anthropologists shocked the world when they discovered a fossil pinkie bone from a then-unknown group of extinct humans in Siberia’s Denisova Cave. The group was named “Denisovans” in its honor. Now, an extensive analysis of DNA in the cave’s soils reveals it also hosted modern humans—who arrived early enough that they may have once lived there alongside Denisovans and Neanderthals.

***

"Humans—including Neanderthals and Denisovans—are known to have occupied Denisova Cave for at least 300,000 years. Among the eight human fossils unearthed there are the pinkie, three bones from Neanderthals, and even one from a child with one Neanderthal and one Denisovan parent. The cave also contains sophisticated stone tools and jewelry at higher, later levels. But no modern human fossils have been found there. Those artifacts, extensive studies of DNA from these bones, and even one early study of DNA from soils have cemented the cave’s importance for piecing together human evolution.

***

"Working with another team of experts who had previously dated the layers of the cave, the researchers dug out 728 soil samples. After 2 years of analysis, in which they isolated and sequenced the samples, the researchers found human DNA in 175 of them. That makes the study “the largest and most systematic of its kind,” says Katerina Douka, an archaeological scientist at the Max Planck Institute for the Science of Human History who was not involved in the work.

***

"The data reveal a complex history of human and animal habitation, with different groups moving in and out of the cave over time, Zavala and her colleagues report today in Nature. Their work confirms that Denisovans were the cave’s first human inhabitants, about 300,000 years ago. They disappeared 130,000 years ago, only to be followed by a different group of Denisovans, who likely made many of the stone tools, some 30,000 years later. Neanderthals appeared on the scene about 170,000 years ago, with different groups using the cave at various points in time, some overlapping with the Denisovans.

"The last to arrive were modern humans, who showed up about 45,000 years ago. The soil layer that corresponds with that period contained DNA from all three human groups, the researchers report. “The time periods [of each layer] are quite large, so we can’t concretely say if they overlapped or not,” Zavala says. But, Douka adds, “I cannot think of another site where three human species lived through time.”

"Given the jewelry and sophisticated artifacts in later layers, some researchers had suspected moderns had been there. But no one knew they had arrived as early as 45,000 years ago—and overlapped with both of our archaic cousins. “It suggests a more complicated interplay between archaic and modern humans,” says Ron Pinhasi, an evolutionary anthropologist at the University of Vienna who was not involved with the work."

Comment: No surprises. Caves are great natural shelters.