http://goo.gl/qKvp27 Sciences News 11:44am, March 19, 2014 Early Polynesians didn't go to Americas, chicken DNA hints 早期的玻里尼西亚人并没有到达美洲，根据鸡的DNA检测 Ancient Polynesians probably didn’t reach the shores of South America, an analysis of ancient chicken DNA from islands dotting the Pacific suggests. 古时的玻里尼西亚人也许没有抵达南美洲的海岸，一项对太平洋岛屿上古时的鸡DNA检测 显示出这个结果。 ------------------------------------------------------------------------------ Between about 3,400 and 700 years ago, Polynesians settled the islands of the Pacific, carrying plants and food animals with them. Researchers have used DNA from pigs, chickens and rats to help trace the people’s island-hopping path. 在距今三千四百年前到七百年前这段时间里，玻里尼西亚人在太平洋的各岛屿上扩散、定 居，同时也带着农作与粮食用动物。研究者曾利用猪、鸡、老鼠的 DNA 来追溯这些人当时 跳岛移动的路径。 ------------------------------------------------------------------------------ One study of chicken DNA had suggested that Polynesians reached South America sometime before Columbus. Now Vicki Thomson of the University of Adelaide in Australia and colleagues question that report. Contamination of ancient DNA samples with modern chicken DNA misled the researchers, Thomson’s group reports March 17 in the Proceedings of the National Academy of Sciences. 以前一项针对鸡 DNA 的研究曾经显示，玻里尼西亚人在哥伦布之前就抵达了南美洲。 而现在，来自澳洲阿德雷德大学的 Vicki Thomson 与他的同伴对此表示怀疑，Thomson 的 团队在17日於 Proceedings of the National Academy of Sciences 发表的报告中表示， 那个以前的研究，早期的 DNA 样本被现代鸡的 DNA 给污染了，误导了研究人员。 ------------------------------------------------------------------------------ The team studied maternally inherited mitochondrial DNA from 22 ancient chicken bones and 122 modern chickens’ feathers, collected from islands in the Pacific and Southeast Asia. They also cleaned up ancient chicken samples used in the earlier study and found that the Pacific island samples aren’t the type found in South America. That finding suggests that Polynesians’ journeys did not take them to the Americas. Thomson 的团队研究了来自太平洋各岛屿及东南亚的22支古代鸡骨与122个支现代鸡羽毛中 的粒线体DNA，他们也清理了以前研究的样本，结果发现这些太平洋岛屿的鸡 DNA 样本， 与南美洲的类型不同。此发现可能显示玻里尼西亚人的旅程并没有到达南美洲。 ------------------------------------------------------------------------------ The analysis also revealed that some ancient chicken breeds are still alive on remote Pacific islands, such as Marquesas, Vanuatu and the Santa Cruz and Solomon islands. 这项分析也显示出，现在仍然有一些古老品种的鸡只生活在偏远的太平洋岛屿上， 例如 马克萨斯群岛、万那杜、圣克鲁斯群岛与所罗门群岛。 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 49.159.193.48 ※ 编辑: shinshong 来自: 49.159.193.48 (03/20 22:41) ※ shinshong:转录至看板 historia 03/20 22:42