Radiocarbon dating and isotopic palaeoecology of Glossotherium phoenesis from the Late Pleistocene of the Santa Elina rock shelter, Central Brazil

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Thais Rabito Pansani, Mário André Trindade Dantas, Lidiane Asevedo, Alexander Cherkinsky, Denis Vialou, Águeda Vilhena Vialou, Mírian Liza Alves Forancelli Pacheco
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Abstract

The Santa Elina rock shelter (Central Brazil) stands out with two human occupation layers with ground sloth fossil remains from the Late Pleistocene. Here, we explore the palaeontological aspect of this site. We update the taxonomic assignment of the ground sloth found in the shelter to Glossotherium phoenesis. Radiocarbon dating performed on bioapatite (14Cbioapatite) from two tooth specimens reveal the minimum ages of 14 944–15 239 cal a bp (unit II2) and 22 339–22 534 cal a bp (unit III4), which were converted to collagen using a novel approach and presented the calibrated ages of 17 450–17 906 cal a bp (14Ccollagen = 14 547 ± 40) and 25 994–26 396 cal a bp (14Ccollagen = 22 042 ± 40). We reinforce the chronology of the oldest unit of Santa Elina with material culture in association with megafauna bones to the Last Glacial Maximum. Carbon isotopic signatures suggest a mixed feeding diet for both specimens. The most recent ground sloth presents a higher isotopic value (δ13C = −1.8‰) and narrower niche breadth (BA = 0.50) than the oldest one (δ13C = −3.3‰; BA = 0.74). We conclude that G. phoenesis lived in an arboreal savanna habitat during the phases studied. Slightly different oxygen isotopic values (δ18O = 26.2‰ and 27.9‰) might suggest a decrease in humidity over time. Our results provide insights into the palaeoecology of the tropical Pleistocene G. phoenesis and the palaeoenvironmental setting of Santa Elina when occupied by early humans and megafauna during the Late Pleistocene.

巴西中部Santa Elina岩洞晚更新世Glossotherium phoenesis的放射性碳定年和同位素古生态学研究
Santa Elina 岩石避难所(巴西中部)有两层人类居住层,其中有晚更新世的地懒化石遗迹。在此,我们探讨了该遗址的古生物学方面。我们更新了避难所中发现的地懒的分类归属,将其归类为 Glossotherium phoenesis。对两颗牙齿标本的生物磷灰石(14Cbioapatite)进行的放射性碳测年显示,它们的最小年龄分别为 14 944-15 239 cal a bp(II2单元)和 22 339-22 534 cal a bp(III4单元),使用一种新方法将其转换为胶原蛋白,得出的校准年龄分别为 17 450-17 906 cal a bp (14Ccollagen = 14 547 ± 40) 和 25 994-26 396 cal a bp (14Ccollagen = 22 042 ± 40)。我们加强了圣埃利纳最古老单元的年代学,其物质文化与巨型动物骨骼有关,可追溯到末次冰川极盛时期。碳同位素特征表明,这两种标本都以混合食物为食。与最古老的地懒(δ13C = -3.3‰;BA = 0.74)相比,最近的地懒呈现出较高的同位素值(δ13C = -1.8‰)和较窄的生态位宽度(BA = 0.50)。我们的结论是,在所研究的阶段中,G. phoenesis 生活在树栖热带稀树草原生境中。略微不同的氧同位素值(δ18O = 26.2‰和27.9‰)可能表明随着时间的推移湿度有所下降。我们的研究结果为了解热带更新世 G. phoenesis 的古生态学以及晚更新世早期人类和巨型动物占据圣埃利纳时的古环境提供了见解。
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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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