Diet and habitat of late Miocene herbivore mammals from Nurpur, District Kangra, Himachal Pradesh, India,Geological Journal

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Diet and habitat of late Miocene herbivore mammals from Nurpur, District Kangra, Himachal Pradesh, India
Geological Journal ( IF 1.4 ) Pub Date : 2022-10-30 , DOI: 10.1002/gj.4621
Abhishek Pratap Singh _{1,

2} , Ramesh Kumar Sehgal _{1,

2} , Ningthoujam Premjit Singh ₁ , Aditya Kharya _{1,

2}

Affiliation

We present the stable carbon (δ¹³C) and oxygen (δ¹⁸O) isotopic composition of 75 serial samples (tooth enamels) from five mammalian fossil groups, which include giraffids, equids, bovids, tragulids, and suids, to reconstruct their diet and habitat. These mammalian faunas were recovered from a late Miocene Middle Siwalik succession exposed in Nurpur, Himachal Pradesh, India (8.14–5.26 Ma). The average δ¹³C data of the studied mammals, that is, −13.30 ± 0.71 (giraffids), −11.29 ± 0.63 (equids), −12.68 ± 0.49‰ (bovids), −12.97 ± 1.11 (tragulids), and −12.01 ± 0.47 (suids) indicates a mainly C3 diet with a minor component of C4 grass (up to 17%) and a habitat dominant by forest/woodland. The average δ¹⁸O value of giraffids (−5.83 ± 0.85) is slightly enriched as compared to other herbivore mammals, such as equids (−8.85 ± 1.71), bovids (−7.86 ± 0.62‰), tragulids (−8.26 ± 1.92), and suids (−10.65 ± 0.23). It suggests that the browsing giraffids could likely intake water from enriched ¹⁸O sources, whereas the other browsing mammals consume water from depleted ¹⁸O sources in the local ecosystem. However, the δ¹⁸O values indicate the existence of a warm, humid climate and more precipitation in the Siwalik during the late Miocene.

中文翻译：

印度喜马偕尔邦 Kangra 区 Nurpur 的晚中新世食草哺乳动物的饮食和栖息地

我们展示了来自五个哺乳动物化石群（包括长颈鹿、马科动物、牛科动物、鲇科动物和猪科动物）的 75 个系列样本（牙釉质）的稳定碳 (δ ¹³ C) 和氧 (δ ¹⁸ O) 同位素组成，以重建它们的饮食和栖息地。这些哺乳动物动物群是从印度喜马偕尔邦努尔布尔 (8.14–5.26 Ma) 暴露的晚中新世中 Siwalik 演替中发现的。所研究哺乳动物的平均δ ¹³ C数据，即-13.30 ± 0.71（长颈鹿）、-11.29 ± 0.63（马科动物）、-12.68 ± 0.49‰（牛科动物）、-12.97 ± 1.11（特拉古利动物）和-12.01 ± 0.47（猪）表示主要是 C3 饮食，含有少量 C4 草（高达 17%），栖息地以森林/林地为主。平均δ ¹⁸与其他食草哺乳动物如马科动物 (-8.85 ± 1.71)、牛科动物 (-7.86 ± 0.62‰)、鲇科动物 (-8.26 ± 1.92) 和猪科动物 ( −10.65 ± 0.23)。这表明食草长颈鹿可能从富含¹⁸ O 的水源中摄取水，而其他食草哺乳动物则从当地生态系统中贫乏的^{18 O 来源中摄取水。}然而，δ ¹⁸ O值表明在晚中新世期间Siwalik存在温暖湿润的气候和更多的降水。

更新日期：2022-10-30

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