Abstract Stable isotopes of carbon and oxygen of fossil specimens are widely used for paleoecological and paleoenvironmental inferences, and there has been an effort to better understand the isotopic paleoecology and chronology of herbivores that inhabited the Brazilian Intertropical Region during the late Quaternary. In the present work, new radiocarbon datings and carbon and oxygen isotopes data for Eremotherium laurillardi, Notiomastodon platensis, Tapirus terrestris, Tayassu pecari, and Mazama gouazoubira are presented, from specimens that lived on Iuiu county (Toca Fria and Jatoba caves), state of Bahia, in the Brazilian Intertropical Region. E. laurillardi was dated as of ∼32 ka BP, representing the oldest direct dating for this species in the Brazilian Intertropical Region, while N. platensis was dated as of ∼25 ka BP. Fossils of the extant species T. pecari, M. gouazoubira, and T. terrestris presented radiocarbon ages of ∼23 ka BP, ∼21 ka BP, and ∼15 ka BP, respectively, showing that some of these species lived in Iuiu during the Last Glacial Maximum. According to our analyses, T. terrestris was the only specialist (δ13C = −11.0‰; piC3 = 0.76; BA = 0.49), whereas the remaining taxa were generalists mixed-feeders (δ13C = −1.3 to −10.0‰; piC3 = 0.24 to 0.69; BA > 0.58). The paleoenvironment reconstruction in Iuiu and other localities in BIR, during ∼32 ka BP to ∼15 ka BP, allow us to suggest that the dry arboreal to open Savanna habitats (rich in grass and shrubs) were the most common environment.

中文翻译：

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来自 IUIU/BA 的哺乳动物的同位素古生态学 (δ13C) 和巴西热带地区到晚更新世的古环境重建 (δ13C, δ18O)

摘要 化石标本的碳氧稳定同位素被广泛用于古生态和古环境推断，人们一直致力于更好地了解晚第四纪居住在巴西热带地区的食草动物的同位素古生态学和年代学。在目前的工作中，提供了来自伊乌县（Toca Fria 和 Jatoba 洞穴）的标本的新的放射性碳测年和碳氧同位素数据，这些数据来自于生活在伊乌县（Toca Fria 和 Jatoba 洞穴）的标本。巴伊亚，在巴西热带地区。E. laurilardi 的年代为~32 ka BP，代表该物种在巴西热带地区的最古老的直接测年，而 N. platensis 的年代为~25 ka BP。现存物种 T. pecari、M. gouazoubira 和 T. terrestris 的化石呈现的放射性碳年龄分别为~23 ka BP、~21 ka BP 和~15 ka BP，表明其中一些物种在末次冰期最大值。根据我们的分析，T. terrestris 是唯一的专家 (δ13C = -11.0‰; piC3 = 0.76; BA = 0.49)，而其余分类群是通才混合饲养者 (δ13C = -1.3 至 -10.0‰; piC3 = 0.24到 0.69；BA > 0.58）。在约 32 ka BP 到约 15 ka BP 期间，Iuiu 和 BIR 其他地方的古环境重建使我们能够表明干燥的树栖开放稀树草原栖息地（富含草和灌木）是最常见的环境。表明其中一些物种在末次冰川盛期期间生活在 Iuiu。根据我们的分析，T. terrestris 是唯一的专家 (δ13C = -11.0‰; piC3 = 0.76; BA = 0.49)，而其余分类群是通才混合饲养者 (δ13C = -1.3 至 -10.0‰; piC3 = 0.24到 0.69；BA > 0.58）。在约 32 ka BP 到约 15 ka BP 期间，Iuiu 和 BIR 其他地方的古环境重建使我们能够表明干燥的树栖开放稀树草原栖息地（富含草和灌木）是最常见的环境。表明其中一些物种在末次冰川盛期期间生活在 Iuiu。根据我们的分析，T. terrestris 是唯一的专家 (δ13C = -11.0‰; piC3 = 0.76; BA = 0.49)，而其余分类群是通才混合饲养者 (δ13C = -1.3 至 -10.0‰; piC3 = 0.24到 0.69；BA > 0.58）。在约 32 ka BP 到约 15 ka BP 期间，Iuiu 和 BIR 其他地方的古环境重建使我们能够表明干燥的树栖开放稀树草原栖息地（富含草和灌木）是最常见的环境。