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Snail trail reveals ancient human migration

Date:
June 20, 2013
Source:
University of Nottingham
Summary:
Geneticists have used snails to uncover evidence of an ancient human migration from the Pyrenean region of France to Ireland.

Genetic markers in banded wood snails in Ireland and France reveal ancient human migrations.
Credit: Lauren Holden

Geneticists from The University of Nottingham have used snails to uncover evidence of an ancient human migration from the Pyrenean region of France to Ireland.

Dr Angus Davison, Reader in Evolutionary Genetics at the University, and PhD student Adele Grindon, found that snails in Ireland and the Pyrenees are genetically almost identical, despite being thousands of miles apart. And -- as snails aren't renowned for their speed -- the simplest explanation is that snails hitched a ride with human migrants approximately 8,000 years ago.

The research is published in journal PLOS ONE on 19 June.

From France to Ireland

Dr Davison said: "There is a very clear pattern, which is difficult to explain except by involving humans. If the snails naturally colonised Ireland, you would expect to find some of the same genetic type in other areas of Europe, especially Britain. We just don't find them.

"There are records of Mesolithic or Stone Age humans eating snails in the Pyrenees, and perhaps even farming them. The highways of the past were rivers and the ocean -- as the river that flanks the Pyrenees was an ancient trade route to the Atlantic, what we're actually seeing might be the long lasting legacy of snails that hitched a ride, accidentally or perhaps as food, as humans travelled from the South of France to Ireland 8,000 years ago.

"The results tie in with what we know from human genetics about the human colonisation of Ireland -- the people may have come from somewhere in southern Europe."

The flora and fauna of Ireland

Despite being close geographically, Ireland is home to many plants and animals which aren't found in Britain.

Dr Davison said: "You would think that anything that gets to Ireland would go through Britain, but it has been a longstanding mystery as to why Ireland is so different from Britain. For these snails, at least, the difference may be that they hitched a ride on a passing boat."


Story Source:

The above story is based on materials provided by University of Nottingham. Note: Materials may be edited for content and length.


Journal Reference:

  1. Adele J. Grindon, Angus Davison. Irish Cepaea nemoralis Land Snails Have a Cryptic Franco-Iberian Origin That Is Most Easily Explained by the Movements of Mesolithic Humans. PLoS ONE, 2013; 8 (6): e65792 DOI: 10.1371/journal.pone.0065792

Cite This Page:

University of Nottingham. "Snail trail reveals ancient human migration." ScienceDaily. ScienceDaily, 20 June 2013. <www.sciencedaily.com/releases/2013/06/130620084633.htm>.
University of Nottingham. (2013, June 20). Snail trail reveals ancient human migration. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2013/06/130620084633.htm
University of Nottingham. "Snail trail reveals ancient human migration." ScienceDaily. www.sciencedaily.com/releases/2013/06/130620084633.htm (accessed July 22, 2014).

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Snail Genetic Tracks Reveal Ancient Human Migration: Mesolithic Humans May Have Carried Snail Species from France to Ireland

June 19, 2013 — Some snails in Ireland and the Pyrenees are genetically almost identical, perhaps because they were carried across the Atlantic during an 8000-year-old human migration. The snail genetics tie in with ... read more
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