气候变化领域集成服务门户(CCPortal): Ontogenetic dietary shifts in Deinonychus antirrhopus (Theropoda; Dromaeosauridae): Insights into the ecology and social behavior of raptorial dinosaurs through stable isotope analysis

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DOI	10.1016/j.palaeo.2020.109780
	Ontogenetic dietary shifts in Deinonychus antirrhopus (Theropoda; Dromaeosauridae): Insights into the ecology and social behavior of raptorial dinosaurs through stable isotope analysis
	Frederickson J.A.; Engel M.H.; Cifelli R.L.
发表日期	2020
ISSN	0031-0182
卷号	552
英文摘要	The image of the highly intelligent, pack-hunting raptor has become engrained in scientific literature and popular works alike. First proposed to explain the relatively common co-occurrence of the large-bodied iguanodontian Tenontosaurus tilletti and the wolf-sized Deinonychus antirrhopus from the Lower Cretaceous of North America, a canid-like social hunting structure has become the standard depiction of dromaeosaurs in popular works over the last three decades. This reconstruction is, however, problematic largely due to the fact that highly coordinated hunting strategies are rarely observed in modern archosaurs. This has led to the alternative hypothesis that D. antirrhopus was more analogous to agonistic reptilian carnivores, like the Komodo dragon (Varanus komodoensis). Among the many differences between these two analogs is how social and asocial organisms rear their young, producing a diagnostic pattern based on the presence or absence of ontogenetic dietary changes. In order to test for dietary changes through growth, stable carbon and oxygen isotope (δ13C, δ18O) analysis was performed on tooth carbonate from small (<4.5 mm crown height) and large (>9 mm crown height) D. antirrhopus specimens from two microsites from the Lower Cretaceous Cloverly (Montana) and Antlers (Oklahoma) formations. Teeth from goniopholidid crocodylians and Tenontosaurus tilletti from the Cloverly Formation were also tested for comparison. The results show that the Cloverly goniopholidids, like their modern counterparts, went through a distinct transition in diet as they grew. The smallest teeth were the relatively most enriched in 13C (mean = −9.32‰; n = 5), the medium-sized teeth were the most-depleted in 13C (mean = −10.56‰; n = 5), and the largest teeth were intermediate (mean = −10.12‰; n = 6). These factors are characteristic of the dietary shifts seen in modern asocial reptiles. D. antirrhopus showed this same pattern in tooth samples collected from both rock units, with small teeth being the more enriched in 13C (mean = −8.99‰; n = 10) and the large teeth being more depleted in 13C (mean = −10.38‰; n = 10). These differences suggest that juvenile and adult D. antirrhopus from both formations likely consumed different prey. Hypothetical food sources, such as T. tilletti, are close to the 13C isotopic signal of adult D. antirrhopus, consistent with the hypothesized trophic relationship (predator-prey) between these two species. Juvenile D. antirrhopus had a diet more enriched in 13C, likely composed of smaller-bodied, but trophically-higher species. Taken together, these data add to the growing evidence that D. antirrhopus was not a complex social hunter by modern mammalian standards. © 2020 Elsevier B.V.
英文关键词	Cretaceous; Geochemistry; Palaeoecology; Trophic ecology
语种	英语
scopus关键词	Cretaceous; dinosaur; hunting; isotopic analysis; raptor; reconstruction; social behavior; stable isotope; tooth; Montana; North America; Oklahoma; United States; Canidae; Crocodylidae (all crocodiles); Dinosauria; Dromaeosauridae; Goniopholididae; Iguanodontia; Mammalia; Raptores; Reptilia; Theropoda; Varanus komodoensis
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/150459
作者单位	Weis Earth Science Museum, University of Wisconsin Oshkosh Fox Cities Campus, Menasha, WI 54952, United States; School of Geosciences, University of Oklahoma, Norman, OK 73019, United States; Department of Biology, University of Oklahoma, Norman, OK 73019, United States; Sam Noble Museum, 2401 Chautauqua Avenue, Norman, OK 73072, United States
推荐引用方式 GB/T 7714	Frederickson J.A.,Engel M.H.,Cifelli R.L.. Ontogenetic dietary shifts in Deinonychus antirrhopus (Theropoda; Dromaeosauridae): Insights into the ecology and social behavior of raptorial dinosaurs through stable isotope analysis[J],2020,552.
APA	Frederickson J.A.,Engel M.H.,&Cifelli R.L..(2020).Ontogenetic dietary shifts in Deinonychus antirrhopus (Theropoda; Dromaeosauridae): Insights into the ecology and social behavior of raptorial dinosaurs through stable isotope analysis.Palaeogeography, Palaeoclimatology, Palaeoecology,552.
MLA	Frederickson J.A.,et al."Ontogenetic dietary shifts in Deinonychus antirrhopus (Theropoda; Dromaeosauridae): Insights into the ecology and social behavior of raptorial dinosaurs through stable isotope analysis".Palaeogeography, Palaeoclimatology, Palaeoecology 552(2020).