Record of a juvenile of Ahytherium aureum from the Late Pleistocene of the Brazilian Intertropical Region: radiocarbon dating, isotopic palaeoecology and evidence of predation by a Felidae

IF 1.9 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Journal of Quaternary Science Pub Date : 2023-07-27 DOI:10.1002/jqs.3556

João Paulo da Costa, Hermínio Ismael de Araújo-Júnior, Fernando Henrique de Souza Barbosa, Mário André Trindade Dantas

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Abstract

Teeth and bone remains belonging to the juvenile Megalonychidae family were found in Engrunado cave (Nova Redenção, Bahia, Brazil). We propose an index between the mesiodistal/vestibulo-lingual measurements of caniniforms and molariforms (I_md/_vl) to differentiate isolated teeth of Ahytherium aureum and Australonyx aquae, and based on this index, we suggest that the fossil material belonged to A. aureum. The diaphysis of the right humerus of A. aureum presents biogenic marks assigned to the ichnospecies Nihilichnus nihilicus, suggesting dietary interactions and potential predation by a large felid. Radiocarbon dating and carbon and oxygen isotopic analyses suggest that this individual lived in the region between 36 181 and 41 094 Cal yr bp, feeding on C₃ plant resources (fruit and leaves) in a low-density forest. The revision of radiocarbon dating and carbon and oxygen isotopes for some species found in the Engrunado cave and in the nearby Marota cave enables a climate reconstruction and indicates the maintenance of a forested environment in the region between 15 and 40 kyr.

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巴西热带地区晚更新世一只金色Ahytherium幼蛛的记录：放射性碳年代测定、同位素古生态学和猫科动物捕食的证据

在 Engrunado 洞穴（巴西巴伊亚州 Nova Redenção）中发现了巨齿龙科（Megalonychidae）幼年牙齿和骨骼残骸。我们提出了一个犬齿和臼齿的齿间/龈间测量指数（Imd/vl）来区分Ahytherium aureum和Australonyx aquae的孤立牙齿，并根据该指数认为化石材料属于A.A. aureum右肱骨的干骺端呈现出 Nihilichnus nihilicus生物种的生物标记，这表明它们之间存在饮食互动，并可能被大型猫科动物捕食。放射性碳年代测定以及碳和氧同位素分析表明，该个体生活在公元前 36 181 至 41 094 年之间的地区，以低密度森林中的 C3 植物资源（果实和树叶）为食。对在恩格鲁纳多洞穴和附近的马罗塔洞穴中发现的一些物种的放射性碳年代测定和碳氧同位素的修订，实现了气候重建，并表明该地区在 15 至 40 千年之间保持着森林环境。

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来源期刊

Journal of Quaternary Science 地学-地球科学综合

CiteScore

4.70

自引率

8.70%

发文量

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.