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Annual isotopic diet (δ13C, δ18O) of Notiomastodon platensis (Ameghino, 1888) from Brazilian Intertropical Region
Quaternary International ( IF 2.2 ) Pub Date : 2021-06-19 , DOI: 10.1016/j.quaint.2021.06.015
Mário André Trindade Dantas , Alexandre Liparini , Lidiane Asevedo , Lucas de Melo França , Alexander Cherkinsky

Notiomastodon platensis was an endemic South American proboscidean, which could reach about six tons and had a mixed feeder diet with predominance of C4 grasses in Brazilian Intertropical Region (BIR). In the last decades, its feeding behavior has been rebuilt mainly through dental calculus, enamel microwear and stable isotope analyses. However, all these techniques allow us to know only punctual information about its diet. In the present study we used stable isotopes (carbon and oxygen) in tusk fragments, allowing us to retrieve information about the six years of life for two individual specimens from Bahia state. The tusk fragment LGUESB 0002 was from an individual from Vitória da Conquista county, which lived at 17 ka BP and had a constant grazer diet in a stable climate environment. The other individual was from Coronel João Sá county that lived in the beginning of the Holocene at 9 ka BP, and presented a mixed feeder diet with consumption of C4 grass and C3 plants (pi = 40%), in an environment with high precipitation variation. This research presents the first annual series of isotopic composition for proboscidean tusks from BIR and the first evidence that the species lived in this region during the Holocene.



中文翻译:

来自巴西热带地区的 Notiomastodon platensis (Ameghino, 1888) 的年度同位素饮食 (δ13C, δ18O)

Notiomastodon platensis是一种地方性南美长鼻动物,可达到约 6 吨,并具有以 C 4为主的混合饲养饮食巴西热带地区 (BIR) 的草。在过去的几十年里,主要通过牙结石、牙釉质微磨损和稳定同位素分析重建了它的摄食行为。然而,所有这些技术都让我们只知道关于它的饮食的准时信息。在本研究中,我们在象牙碎片中使用了稳定同位素(碳和氧),这使我们能够检索来自巴伊亚州的两个个体标本的六年寿命信息。象牙碎片 LGUESB 0002 来自 Vitória da Conquista 县的一个个体,该个体生活在 17 ka BP 并且在稳定的气候环境中具有恒定的食草动物饮食。另一个人来自 Coronel João Sá 县,生活在全新世初期 9 ka BP,并提供混合饲养饮食,消耗 C 4草和 C 3植物 ( pi  = 40%),在降水变化很大的环境中。这项研究展示了 BIR 长鼻象牙的第一个年度同位素组成系列,以及该物种在全新世期间生活在该地区的第一个证据。

更新日期:2021-06-19
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