美国科学60秒 SSS 2015-02-26（在线收听） |
Early farming began in the Near East about 10500 years ago. Farming first reached Balkans in Europe some 8 to 9 thousand years ago and then crept westward. Locals in Britain seperated from mainland by the relatively newly formed English Channal did not start farming until about 6000 years ago. But an analysis of sediment from a submerged British archaeological site called Bouldner Cliff found something unexpected. Amongst our Bouldner Cliff samples, we found ancient DNA evidence of wheat at the site, which was mot seen in mainland Britain for another 2 thousand years, That's Robin Allaby of the university of Warwick. However, wheat was already been grown in southern Europe. It's incredibly exciting because it means Boundler's inhabitants were not isolated as priviously thought. In fact, they were in touch, one way or another, with more advanced Neolithic farming communities in southern Europe. The work by Allaby and colleagues is in the Journal Science. The researchers showed that the wheat remains are genetically more similar to Near Eastern domesticated wheat than to local distant cousins. And they found no evidence of pollen--- meaning that the wheat was almost certainly imported. In an accompanying perspective piece in the journal, archeaologist GL of Durham university writes that the findings show that DNA analysis can help scientists tease out details about historical movement of plants and animal species. |
| 原文地址：http://www.tingroom.com/lesson/sasss/2015/2/302332.html |