Ancient DNA research shines spotlight on Iberia

EurekAlert! ^ | March 14, 2019 | University of Huddersfield

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The largest-ever study of ancient DNA from the Iberian Peninsula (Spain and Portugal) suggests that the Iberian male lineages were almost completely replaced between 4,500 and 4,000 years ago by newcomers originating on the Russian steppe...

Most striking was an influx of new people during the later Copper Age, otherwise known as the Beaker period because of the ubiquitous presence in burials of large drinking vessels, from about 4,500 years ago. By the Early Bronze Age, 500 years later, these newcomers represented about 40% of Iberia's genetic pool - but virtually 100% of their male lineages...

This is an extraordinary example of sex bias - a phenomenon described previously by Huddersfield's Leverhulme Trust doctoral scholar Marina Silva for India. What is even more striking now is that both Iberia and India had a similar source - a population of early metal-using stock breeders, who lived to the north of the Black Sea on Russian steppe lands, 5,000 years ago. They fanned out in both directions, west across Europe and east into Asia, their pastoralist economy, domesticated horses and wheeled wagons giving them a crucial advantage over the indigenous farming populations. Moreover, they are also thought to have brought the Indo-European languages spoken across Europe and India today...

Marina Silva added: "It's an intriguing situation, because the Beaker culture originated in Portugal and spread across Europe from there - but at the same time, or shortly after, men who probably spoke Indo-European languages were moving in the opposite direction. Resolving the population dynamics in western Europe during the Copper and Bronze Ages is a big step towards understanding the origins of the Celtic languages, which were spoken across western Europe before the rise of the Roman Empire."

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Cattle were (usually still are) preferred among non-nomadic animal husbandry practitioners, precisely because of root destruction. Settled groups wanting animals which get to slaughter weight more quickly probably opted for hogs. Cattle rule because of their milk production, but hogs will eat pretty much anything, and not burn up a lot of energy because they tend to lay around a lot, just getting up to weight. Of course, they are by and large smarter when the day comes.