Environmental conditions framing the first evidence of modern humans at Tam Pà Ling, Laos: A stable isotope record from terrestrial gastropod carbonates
Environmental conditions framing the first evidence of modern humans at Tam Pà Ling, Laos: A stable isotope record from terrestrial gastropod carbonates
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DOI：
10.1016/j.palaeo.2018.08.020
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Stefania Milano;F. Demeter;J. Hublin;P. Duringer;Elise Patole-Edoumba;J. Ponche;L. Shackelford;
中科院分区：
文献类型：
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作者：
Stefania Milano;F. Demeter;J. Hublin;P. Duringer;Elise Patole-Edoumba;J. Ponche;L. Shackelford;
东南亚大陆是解释现代人类迁徙的关键区域；然而，由于缺乏陆地代用物，环境条件还没有得到很好的了解。本研究的重点是老挝东北部的Tam pongling洞穴遗址，该遗址包含印度支那最古老的现代人类证据，可追溯到MIS 4（70 ± 8 ka）。在整个地层序列中发现的camaena地块的蜗牛遗骸包含了过去当地植被和湿度变化的宝贵氧和碳同位素记录。研究结果表明，末次盛冰期前，老挝东北部气候湿润，以森林为主。随着LGM的开始，发生了重大的气候变化，导致降水急剧减少，林地生境显著减少，有利于向更开阔的景观扩展。直到全新世，森林才在老挝东北部恢复，类似于现在的情况。因此，第一批到达印度支那的智人遇到了以林地为主的景观，只有一小部分是开放的栖息地。
Mainland Southeast Asia is a key region to interpret modern human migrations; however, due to a scarcity of terrestrial proxies, environmental conditions are not well understood. This study focuses on the Tam Pà Ling cave site in northeast Laos, which contains the oldest evidence for modern humans in Indochina, dating back to MIS 4 (70 ± 8 ka). Snail remains ofCamaena massieifound throughout the stratigraphic sequence contain a valuable oxygen and carbon isotope record of past local vegetation and humidity changes. Our data indicate that before the Last Glacial Maximum (LGM), northeast Laos was characterized by a humid climate and forested environments. With the onset of the LGM, a major climatic shift occurred, inducing a sharp decrease in precipitation and a significant decline in woodland habitats in favor of the expansion to more open landscapes. Only during the Holocene did forests return in northeast Laos, resembling present conditions. The firstHomo sapiensarriving in Indochina therefore encountered landscapes dominated by woodlands with a minor proportion of open habitats.