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DOI	10.1016/j.palaeo.2019.05.012
	Diet preferences and climate inferred from oxygen and carbon isotopes of tooth enamel of Tarbosaurus bataar (Nemegt Formation; Upper Cretaceous; Mongolia)
	Owocki K.; Kremer B.; Cotte M.; Bocherens H.
发表日期	2019
ISSN	0031-0182
英文摘要	Stable isotopes of oxygen and carbon of tooth enamel are increasingly being used as tracers to study palaeoecology and the diet preferences of fossil vertebrates. We serially sampled tooth enamel carbonate along the growth axes of five Early Maastrichtian carnivorous dinosaur teeth (Tarbosaurus bataar tyrannosaurid) from the Nemegt Formation, Mongolia, in order to identify seasonal climatic variations and determine the diet of this apex predator. Additional bulk samples of dentine, bone, and surrounding sediment were analyzed in order to exclude diagenetic obfuscation of the isotopic record. Enamel samples of potential prey species for dietary studies were also analyzed. In the case of the largest specimens, the sampled teeth usually recorded annual cycles ranging between two-thirds and a full year. Fluctuations in δ18O values in tyrannosaurid teeth suggest seasonality (high annual temperatures with distinct precipitation/humidity maxima during summer months) with mean annual temperatures (MAT) ten degrees higher than those of present-day Mongolia. The seasonal pattern of δ18O shows similarities to that of the modern-day Shijiazhuang Global Network of Isotopes in Precipitation station, northern China, and suggests that the Nemegt biota flourished when exposed to a cool temperate monsoon-influenced climate. Herbivore and carnivore carbon isotopes (δ13C) values from tooth enamel imply the presence of a woodland ecosystem dominated by coniferous trees such as Araucariaceae, and are consistent with the hypothesis that large sauropods and hadrosaurids were the preferred prey of Tarbosaurus. Mean annual precipitation (MAP), based on the relationship between modern-day C3 gymnosperms and local average MAP, is estimated at 775–835 mm/yr. These results show that large theropod teeth can serve as valuable archives for palaeoenvironmental studies. © 2019 Elsevier B.V.
英文关键词	Early Maastrichtian; Gobi; Palaeoclimate; Palaeoecology; Stable isotopes; Tyrranosaurid
语种	英语
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151198
作者单位	Institute of Palaeobiology, Polish Academy of Sciences, Warsaw, Poland; Department of Geosciences, University of Tübingen, Tübingen, Germany; Senckenberg Centre for Human Evolution and Palaeoenvironment, Tübingen, Germany
推荐引用方式 GB/T 7714	Owocki K.,Kremer B.,Cotte M.,et al. Diet preferences and climate inferred from oxygen and carbon isotopes of tooth enamel of Tarbosaurus bataar (Nemegt Formation; Upper Cretaceous; Mongolia)[J],2019.
APA	Owocki K.,Kremer B.,Cotte M.,&Bocherens H..(2019).Diet preferences and climate inferred from oxygen and carbon isotopes of tooth enamel of Tarbosaurus bataar (Nemegt Formation; Upper Cretaceous; Mongolia).Palaeogeography, Palaeoclimatology, Palaeoecology.
MLA	Owocki K.,et al."Diet preferences and climate inferred from oxygen and carbon isotopes of tooth enamel of Tarbosaurus bataar (Nemegt Formation; Upper Cretaceous; Mongolia)".Palaeogeography, Palaeoclimatology, Palaeoecology (2019).