Posted on Science
Digest
New findings
from an international team of researchers show that most Neanderthals in Europe
died off around 50,000 years ago. The previously held view of a Europe
populated by a stable Neanderthal population for hundreds of thousands of years
up until modern humans arrived must therefore be revised.
This new
perspective on the Neanderthals comes from a study of ancient DNA published
February 25 in Molecular Biology and Evolution.
The results
indicate that most Neanderthals in Europe died off as early as 50,000 years
ago. After that, a small group of Neanderthals recolonized central and western
Europe, where they survived for another 10,000 years before modern humans entered
the picture.
The study is
the result of an international project led by Swedish and Spanish researchers
in Uppsala, Stockholm and Madrid.
“The fact
that Neanderthals in Europe were nearly extinct, but then recovered, and that
all this took place long before they came into contact with modern humans came
as a complete surprise to us. This indicates that the Neanderthals may have
been more sensitive to the dramatic climate changes that took place in the last
Ice Age than was previously thought”, says Love Dalén, associate professor at
the Swedish Museum of Natural History in Stockholm.
In
connection with work on DNA from Neanderthal fossils in Northern Spain, the
researchers noted that the genetic variation among European Neanderthals was
extremely limited during the last ten thousand years before the Neanderthals
disappeared.
Older
European Neanderthal fossils, as well as fossils from Asia, had much greater
genetic variation, on par with the amount of variation that might be expected
from a species that had been abundant in an area for a long period of time.
“The amount of genetic variation in geologically older Neanderthals as well as
in Asian Neanderthals was just as great as in modern humans as a species,
whereas the variation among later European Neanderthals was not even as high as
that of modern humans in Iceland”, says Anders Götherström, associate professor
at Uppsala University.
The results
presented in the study are based entirely on severely degraded DNA, and the
analyses have therefore required both advanced laboratory and computational
methods. The research team has involved experts from a number of countries,
including statisticians, experts on modern DNA sequencing and
paleoanthropologists from Denmark, Spain and the US.
Only when
all members of the international research team had reviewed the findings could
they feel certain that the available genetic data actually reveals an important
and previously unknown part of Neanderthal history. “This type of
interdisciplinary study is extremely valuable in advancing research about our
evolutionary history. DNA from prehistoric people has led to a number of
unexpected findings in recent years, and it will be really exciting to see what
further discoveries are made in the coming years”, says Juan Luis Arsuaga,
professor of human paleontology at the Universidad Complutense of Madrid.
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