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This new research was in the news yesterday.
Abstract
The maritime expansion of Scandinavian populations during the Viking Age (about ad 750–1050) was a far-flung transformation in world history1,2. Here we sequenced the genomes of 442 humans from archaeological sites across Europe and Greenland (to a median depth of about 1×) to understand the global influence of this expansion. We find the Viking period involved gene flow into Scandinavia from the south and east. We observe genetic structure within Scandinavia, with diversity hotspots in the south and restricted gene flow within Scandinavia. We find evidence for a major influx of Danish ancestry into England; a Swedish influx into the Baltic; and Norwegian influx into Ireland, Iceland and Greenland. Additionally, we see substantial ancestry from elsewhere in Europe entering Scandinavia during the Viking Age. Our ancient DNA analysis also revealed that a Viking expedition included close family members. By comparing with modern populations, we find that pigmentation-associated loci have undergone strong population differentiation during the past millennium, and trace positively selected loci—including the lactase-persistence allele of LCT and alleles of ANKA that are associated with the immune response—in detail. We conclude that the Viking diaspora was characterized by substantial transregional engagement: distinct populations influenced the genomic makeup of different regions of Europe, and Scandinavia experienced increased contact with the rest of the continent.
https://www.nature.com/articles/s41586-020-2688-8
Here's a long and sensational article with some highlights. The main points:
- Vikings were far from pure Scandinavians. They were genetically diverse, with an influx of southern European and Asian genes stretching back to the end of the Iron Age. This suggests that only a small number of them were fair-haired, according to professor Eske Willerslev.
- Viking myths were formed in the 19th century by authors such as Adam Oehlenschläger and J.J.A. Worsaae. This was a low point in Danish history (having lost our fleets to Napoleon in 1807, Norway in 1814 and Slesvig, Holsten and parts of Sønderjylland in 1864), and they therefore had a wide appeal according to researcher Kasper H. Andersen.
- The Viking age was distinct. Contrary to the belief that the viking age was an extension of the Iron Age, it was in fact a unique period in several fields, especially maritime.
- Norway and Sweden had only few Vikings. DNA analysis shows that the populations of Denmark, Sweden and Norway didn't have much contact at the time. Denmark was the hub of Viking culture , along with Øland and Åland. The rest of Scandinavia was populated by farmers who hadn't changed much since the Stone Age.
- Farmers had different genes. The inland population of Sweden and Norway barely changed genetically in thousands of years and was distinct from that of the Viking coastal settlements.
- Fair hair was the ideal. The spread of fair hair in Scandinavia is the result of sexual selection, according to professor Willerslev, despite brown hair being more common at the time.
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