Isotopic insight on paleodiet of extinct Pleistocene megafaunal Xenarthrans from Argentina
Isotopic insight on paleodiet of extinct Pleistocene megafaunal Xenarthrans from Argentina
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DOI：
10.1016/j.gr.2017.04.003
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发表时间：
2017-08-01
影响因子：
6.1
通讯作者：
Prevosti, Francisco J.
中科院分区：
文献类型：
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作者：
Bocherens, Herve;Cotte, Martin;Prevosti, Francisco J.
已灭绝的巨型克森松龙的饮食是一个有争议的话题，特别是对于地懒，人们提出了通过拾取或积极狩猎来捕食草食、食虫和肉食的食物。在这项研究中，保存完好的化石骨骼的胶原和碳酸盐部分的稳定碳同位素组成被用作营养水平的示踪剂。>；200种不同饮食的现代哺乳动物骨骼被用作参考数据集。使用不同的成岩指示剂，并使用同一地点的食肉和草食化石类群作为测试类群，检查了碳酸盐同位素组成的良好保存情况。对现代哺乳动物的研究结果表明，食肉动物(食肉动物、食虫动物、食鱼动物、杂食动物)和草食动物之间碳酸盐和胶原的碳同位素组成有明显的区别。利用这一框架，对巨型动物异种动物化石的研究结果表明，这两种角齿动物的食草性食物，也与巨型地面树懒的食草性食物一致，包括Megatherum。Megatherium可能是一种神秘的食肉动物或食虫动物的假设并不得到本研究结果的支持。(C)2017年国际冈瓦那研究会。爱思唯尔出版，版权所有。
The diet of extinct giant Xenarthrans is a debated topic, especially for ground sloths, for which herbivory, insectivory, and carnivory through scavenging or active hunting have been suggested. In this study, stable carbon isotopic composition of collagen and carbonate fraction of well-preserved fossil bones was used as a tracer of trophic level. >200 modern mammal bones of species with a variety of diets were used as a reference dataset. The good preservation of the carbonate isotopic composition was checked using different diagenetic indicators and by using fossil carnivorous and herbivorous taxa from the same sites as test-taxa. The results on modern mammals indicate a clear distinction in the difference between the carbon isotopic composition of carbonate and collagen between faunivores (carnivores, insectivores, piscivores, omnivores) and herbivores. Using this framework, the results on the fossil megafaunal Xenarthrans indicate a herbivorous diet for both Glyptodontids and are also consistent with a herbivorous diet for giant ground sloths, including Megatherium. The hypothesis that Megatherium could be a cryptic meat-eater or an insectivore is not supported by the results obtained in the present study. (C) 2017 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.