English, Irish, Scots: They’re All One, Genes Suggest
By NICHOLAS WADE
Britain and Ireland are so thoroughly divided in their histories that there is no single word to refer to the inhabitants of both islands. Historians teach that they are mostly descended from different peoples: the Irish from the Celts, and the English from the Anglo-Saxons who invaded from northern Europe and drove the Celts to the country’s western and northern fringes.
But geneticists who have tested DNA throughout the British Isles are edging toward a different conclusion. Many are struck by the overall genetic similarities, leading some to claim that both Britain and Ireland have been inhabited for thousands of years by a single people that have remained in the majority, with only minor additions from later invaders like Celts, Romans, Angles , Saxons, Vikings and Normans.
The implication that the Irish, English, Scottish and Welsh have a great deal in common with each other, at least from the geneticist’s point of view, seems likely to please no one.
The genetic evidence is still under development, however, and because only very rough dates can be derived from it, it is hard to weave evidence from DNA, archaeology, history and linguistics into a coherent picture of British and Irish origins.
That has not stopped the attempt. Stephen Oppenheimer, a medical geneticist at the University of Oxford, says the historians’ account is wrong in almost every detail. In Dr. Oppenheimer’s reconstruction of events, the principal ancestors of today’s British and Irish populations arrived from Spain about 16,000 years ago, speaking a language related to Basque.
The British Isles were unpopulated then, wiped clean of people by glaciers that had smothered northern Europe for about 4,000 years and forced the former inhabitants into southern refuges in Spain and Italy. When the climate warmed and the glaciers retreated, people moved back north.
The new arrivals in the British Isles would have found an empty territory, which they could have reached just by walking along the Atlantic coastline, since there were still land bridges then across what are now English Channel and the Irish Sea.
This new population, who lived by hunting and gathering, survived a sharp cold spell called the Younger Dryas that lasted from 12,300 to 11,000 years ago. Much later, some 6,000 years ago, agriculture finally reached the British Isles from its birthplace in the Near East.
Agriculture may have been introduced by people speaking Celtic, in Dr. Oppenheimer’s view. Although the Celtic immigrants may have been few in number, they spread their farming techniques and their language throughout Ireland and the western coast of Britain. Later immigrants arrived from northern Europe had more influence on the eastern and southern coasts. They too spread their language, a branch of German, but these invaders’ numbers were also small compared with the local population.
In all, about three-quarters of the ancestors of today’s British and Irish populations arrived between 15,000 and 7,500 years ago, when rising sea levels finally divided Britain and Ireland from the Continent and from one another, Dr. Oppenheimer calculates in a new book, “The Origins of the British: A Genetic Detective Story” (Carroll & Graf, 2006).
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A different view of the Anglo-Saxon invasions has been developed by Mark Thomas of University College, London. Dr. Thomas and colleagues say the invaders wiped out substantial numbers of the indigenous population, replacing 50 percent to 100 percent of those in central England.
Their argument is that the Y chromosomes of English men seem identical to those of people in Norway and the Friesland area of the Netherlands, two regions from which the invaders may have originated.
Dr. Oppenheimer disputes this, saying the similarity between the English and northern European Y chromosomes arises because both regions were repopulated by people from the Iberian refuges after the glaciers retreated.
Dr. Sykes said he agreed with Dr. Oppenheimer on this point, but another geneticist, Christopher Tyler-Smith of the Sanger Centre near Cambridge, said the jury was still out. “There is not yet a consensus view among geneticists, so the genetic story may well change,” he said. As to the identity of the first postglacial settlers, Dr. Tyler-Smith said he “would favor a Neolithic origin for the Y chromosomes, although the evidence is still quite sketchy.”
Dr. Oppenheimer’s population history of the British Isles relies not only on genetic data but also on the dating of language changes by methods developed by geneticists. These are not generally accepted by historical linguists, who long ago developed but largely rejected a dating method known as glottochronology.
Geneticists have recently plunged into the field, arguing that linguists have been too pessimistic and that advanced statistical methods developed for dating genes can also be applied to languages.
Dr. Oppenheimer has relied on work by Peter Forster, a geneticist at Anglia Ruskin University, to argue that Celtic is a much more ancient language than supposed, and that Celtic speakers could have brought knowledge of agriculture to Ireland, where it first appeared. He also adopts Dr. Forster’s argument, based on a statistical analysis of vocabulary, that English is an ancient, fourth branch of the Germanic language tree, and was spoken in England before the Roman invasion.
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Historians have usually assumed that Celtic was spoken throughout Britain when the Romans arrived. But Dr. Oppenheimer argues that the absence of Celtic place names in England — words for places are particularly durable — makes this unlikely.
If the people of the British Isles hold most of their genetic heritage in common, with their differences consisting only of a regional flavoring of Celtic in the west and of northern European in the east, might that perception draw them together? Geneticists see little prospect that their findings will reduce cultural and political differences.
The Celtic cultural myth “is very entrenched and has a lot to do with the Scottish, Welsh and Irish identity; their main identifying feature is that they are not English,” said Dr. Sykes, an Englishman who has traced his Y chromosome and surname to an ancestor who lived in the village of Flockton in Yorkshire in 1286.
Dr. Oppenheimer said genes “have no bearing on cultural history.” There is no significant genetic difference between the people of Northern Ireland, yet they have been fighting with each other for 400 years, he said.
As for his thesis that the British and Irish are genetically much alike, “It would be wonderful if it improved relations, but I somehow think it won’t.”
Originally Posted by starbkjrus
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