Biology Magazine

Neanderthals Lived Further North Than We Thought

Posted on the 04 October 2018 by Reprieve @EvoAnth

Neanderthals lived during one of the coldest periods in recent (pre)history. They thrived through a bitter ice age that saw much of northern Europe covered in glaciers. Surely this limited how far north they lived.

However, researchers Nielsen et al. think we're selling Neanderthals short. The ice age was interspersed with warmer periods - well, what counts as warm during an ice age. Perhaps they spread north then 1.

Unfortunately for Nielsen and company's pet theory, the fossils are missing. We've not found any Neanderthal sites beyond Germany, even in those warmer times. So that's their idea blow out the water.

Or is it?

A gap in the record

Don't get me wrong, there is definitely a dearth of Neanderthal sites far north. The thing is, Nielsen et al. think that might be caused by something other than "no Neanderthals". Maybe we simply haven't found them yet 1.

Or rather, we may well have found them but we don't realise they were made by Neanderthals. We've found several sites in Denmark, but their age is uncertain. Without any associated fossils, it's hard to justify the claim Neanderthals lived there 1.

Part of this uncertainty - and general scarcity of sites that far north - might be a by-product of the following glaciation. As glaciers spread across Scandinavia, they often damaged the ground below them. Much of the evidence may simply have been smashed by the very ice age that makes people doubt Neanderthals lived there 1.

Those dastardly glaciers, they thought of everything!

Of course, this creates a bit of a problem for Nielsen et al. How can we figure out where Neanderthals lived when there's no evidence of, you know, where they lived?

Neanderthals lived in a computer

The Eemian period is one of the less harsh phases from the last glacial period. We've found more than 30 Neanderthal sites from this period that have a solid record of the local environment. Although they're all too far south to settle the debate over northern Neanderthals, they do give us a good idea of the conditions Neanderthals liked to live in 1.

So Nielsen et al. used this data to create a map of Europe, ranking regions on how close to "optimum Neanderthal" they fell. And, surprise surprise, a good chunk of Southern Scandinavia fell quite high on this ranking. So it seems that Nielsen et al. were right all along: Neanderthals could have made it further north than we thought 1.

Of course, a computer saying Neanderthals lived somewhere doesn't mean they actually did. There could be something else stopping them spreading north. Maybe there was a mountain in the way. Or they just didn't like the smell.

So Nielsen et al. also went looking for other factors which might limit their northwards expansion. Sure enough, they found the sea sometimes got in the way. Whilst landbridges existed across much of Scandinavia during the glacial period, sometimes the landscape looked more like it did today; cutting apart the landmasses. Thus, sometimes the Neanderthals would have been trapped south 1.

But not always. Sometimes the stars aligned and the sea levels dropped and the land remained habitable. During those periods there's no reason for the Neanderthals to not expand north. So perhaps they did 1.

Hopefully, now we can start looking for them outside of a computer.

References

  1. Nielsen, T.K., Benito, B.M., Svenning, J.C., Sandel, B., McKerracher, L., Riede, F. and Kjærgaard, P.C., 2017. Investigating Neanderthal dispersal above 55 N in Europe during the Last Interglacial Complex. Quaternary International, 431, pp.88-103.
  2. Lokrantz, H. and Sohlenius, G., 2006. Ice marginal fluctuations during the Weichselian glaciation in Fennoscandia, a literature review (No. SKB-TR-06-36). Swedish Nuclear Fuel and Waste Management Co..

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