Monday, 29 March 2021

Evolution News - The Origins of the Scythians

Summary maps visualizing the main findings of the research. Figure from the article.
© Gnecchi-Rusconi, et al., 2021
Ancient Genomes Trace the Origin and Decline of the Scythians | Max Planck Institute for the Science of Human History

This is my second blog post concerning the origins of historic cultural groups, the first being about the Basques of Northeast Spain and Southwest France. This new understanding has been made possible by advances in recovering DNA from ancient sources and techniques for analysing the results. In effect, it is the result of applied evolutionary theory.

The nomadic Scythians were a major force in Eurasia during the first millennium BCE. Their domestication of the horse allowed them to dominate the steppes of Central Asia and spread far and wide. Then they declined and disappeared from history.

Where they came from, how they relate to other Eurasia peoples and why they disappeared has long been a mystery for historians, but now the work of the Max Planck Institute for the Science of Human History, by analysing the DNA from the remains they left in their burial mounds is providing some answers. As always, the DNA shows the evolutionary changes and relationships that the Theory of Evolution leads us to expect. As the press release from the Max Planck Institute tells the story:

Generally thought of as fierce horse-warriors, the Scythians were a multitude of Iron Age cultures who ruled the Eurasian steppe, playing a major role in Eurasian history. A new study published in Science Advances analyzes genome-wide data for 111 ancient individuals spanning the Central Asian Steppe from the first millennia BCE and CE. The results reveal new insights into the genetic events associated with the origins, development and decline of the steppe’s legendary Scythians.


Because of their interactions and conflicts with the major contemporaneous civilizations of Eurasia, the Scythians enjoy a legendary status in historiography and popular culture. The Scythians had major influences on the cultures of their powerful neighbors, spreading new technologies such as saddles and other improvements for horse riding. The ancient Greek, Roman, Persian and Chinese empires all left a multitude of sources describing, from their perspectives, the customs and practices of the feared horse warriors that came from the interior lands of Eurasia.

An aerial view of Hun-Xianbi culture burials. Both horses and warriors can be identified.

Credit: Zainolla Samashev

Still, despite evidence from external sources, little is known about Scythian history. Without a written language or direct sources, the language or languages they spoke, where they came from and the extent to which the various cultures spread across such a huge area were in fact related to one another, remain unclear.

The Iron Age transition and the formation of the genetic profile of the Scythians


A new study published in Science Advances by an international team of geneticists, anthropologists and archeologists lead by scientists from the Archaeogenetics Department of the Max Planck Institute for the Science of Human History in Jena, Germany, helps illuminate the history of the Scythians with 111 ancient genomes from key Scythian and non-Scythian archaeological cultures of the Central Asian steppe. The results of this study reveal that substantial genetic turnovers were associated with the decline of the long-lasting Bronze Age sedentary groups and the rise of Scythian nomad cultures in the Iron Age. Their findings show that, following the relatively homogenous ancestry of the late Bronze Age herders, at the turn of the first millennium BCE, influxes from the east, west and south into the steppe formed new admixed gene pools.

Mound 4 of the Eleke Sazy necropolis in eastern Kazakhstan

© Zainolla Samashev

The diverse peoples of the Central Asian Steppe


The study goes even further, identifying at least two main sources of origin for the nomadic Iron Age groups. An eastern source likely originated from populations in the Altai Mountains that, during the course of the Iron Age, spread west and south, admixing as they moved. These genetic results match with the timing and locations found in the archeological record and suggest an expansion of populations from the Altai area, where the earliest Scythian burials are found, connecting different renowned cultures such as the Saka, the Tasmola and the Pazyryk found in southern, central and eastern Kazakhstan respectively. Surprisingly, the groups located in the western Ural Mountains descend from a second separate, but simultaneous source. Contrary to the eastern case, this western gene pool, characteristic of the early Sauromatian-Sarmatian cultures, remained largely consistent through the westward spread of the Sarmatian cultures from the Urals into the Pontic-Caspian steppe.

The decline of the Scythian cultures associated with new genetic turnovers


The study also covers the transition period after the Iron Age, revealing new genetic turnovers and admixture events. These events intensified at the turn of the first millennium CE, concurrent with the decline and then disappearance of the Scythian cultures in the Central Steppe. In this case, the new far eastern Eurasian influx is plausibly associated with the spread of the nomad empires of the Eastern steppe in the first centuries CE, such as the Xiongnu and Xianbei confederations, as well as minor influxes from Iranian sources likely linked to the expansion of Persian-related civilization from the south.

Although many of the open questions on the history of the Scythians cannot be solved by ancient DNA alone, this study demonstrates how much the populations of Eurasia have changed and intermixed through time. Future studies should continue to explore the dynamics of these trans-Eurasian connections by covering different periods and geographic regions, revealing the history of connections between west, central and east Eurasia in the remote past and their genetic legacy in present day Eurasian populations.
The group's findings were published open access in Science Advances a few days ago:

Abstract


The Scythians were a multitude of horse-warrior nomad cultures dwelling in the Eurasian steppe during the first millennium BCE. Because of the lack of first-hand written records, little is known about the origins and relations among the different cultures. To address these questions, we produced genome-wide data for 111 ancient individuals retrieved from 39 archaeological sites from the first millennia BCE and CE across the Central Asian Steppe. We uncovered major admixture events in the Late Bronze Age forming the genetic substratum for two main Iron Age gene-pools emerging around the Altai and the Urals respectively. Their demise was mirrored by new genetic turnovers, linked to the spread of the eastern nomad empires in the first centuries CE. Compared to the high genetic heterogeneity of the past, the homogenization of the present-day Kazakhs gene pool is notable, likely a result of 400 years of strict exogamous social rules.

So, as is common with populations that begin to emerge in isolation but ultimately fail to become a distinct genetic grouping, the Scythians were eventually absorbed into other groups who were expanding into their territory. Unlike with the Basques, who were the subject of my earlier blog post, other than sheer distance, there are few natural barriers to movement of human groups in Central Asia, so any linguistic or other cultural barriers were not enough to prevent large-scale admixing with other genetic groups. Eventually, the Scythians were absorbed into other populations.








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