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789
研究学家哈耶斯(右)认为人类祖先起源于非洲尚比西河南部的一个地区。
一项最新研究指出,人类祖先是在距今20万年前诞生于非洲尚比西河南部的一个地区,也就是现今波札那的北部地区。当地现在布满了沙漠和盐地,但是在20万年前却是生机盎然的广大湖泊湿地。
据BBC报道,这份研究发表于28日出刊的《自然》(Nature)杂志中,澳洲迦文医学研究机构的遗传学家哈耶斯教授表示,“解剖学上,人类约是20万年前出现在非洲,但大家长期以来争论的都是他们所出现的‘确切位置’,如今,我们确定人类祖先最先是在南部非洲马卡迪卡迪湖泊附近安顿下来。”
哈耶斯指出,该研究先是从1217位来自南部非洲的居民身上采取数百个粒线体DNA,并透过追踪人类族谱接着进行比对,“这就像地图一样,创建了一个区域作为起点,就是南非马卡迪卡迪湖泊。”
研究人员分析了马卡迪卡迪湖泊中化石和地质记录后,发现该地区“曾经拥有非洲最大的湖泊系统”,是维多利亚湖面积的2倍,非常适合提供人类以及野生动物栖息。研究也指出,人类祖先在该地待了7万年左右,随着气候的变化,开始了3次迁徙,“第一批迁徙向东北方;第二批则向西南方;而第三批人口至今仍留在非洲本国。”
不过,该项研究曝光后,却遭到许多科学家批评,大家都认为“非常不可靠,且研究中样本量太少。”其中,乌普萨拉大学遗传学家卡丽娜表示,“这项结论是非常牵强的,它几乎没有告诉我们整个人类的起源。”伦敦自然历史博物馆的克里斯也表示,“你不能光使用现代线粒体分布来重建现代人类单一地方起源,换句话说,事实应该比研究还要复杂得多。”
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