气候变化领域集成服务门户(CCPortal): Isotopic variation within Tasmanian bare-nosed wombat tooth enamel: Implications for archaeological and palaeoecological research

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DOI	10.1016/j.palaeo.2019.03.003
	Isotopic variation within Tasmanian bare-nosed wombat tooth enamel: Implications for archaeological and palaeoecological research
	Roberts G.L.; Towers J.; Gagan M.K.; Cosgrove R.; Smith C.
发表日期	2019
ISSN	0031-0182
起始页码	97
结束页码	115
卷号	523
英文摘要	Archaeologists and palaeoecologists are increasingly turning to stable isotope analysis (δ 13 C, δ 18 O) of fossil bioapatite to examine interactions of human and animal populations. However, relatively few investigations have focussed on the identification of natural variation in comparable modern populations, particularly within the Australian context. In this paper, we present the first modern isotopic reference dataset for Tasmanian bare-nosed wombat teeth (Vombatus ursinus tasmaniensis). Samples for δ 13 C bioapatite and δ 18 O bioapatite measurements were recovered sequentially at sub-monthly resolution from all tooth types. δ 13 C bioapatite showed little variation within a seasonal sinusoidal pattern within the sample set (n = 24 wombats; 35 teeth) due to the homogeneous C 3 distribution of plants in Tasmania. In contrast, δ 18 O bioapatite profiles varied seasonally, representing time periods of between 0.9 and 2.1 years in 95% of the sample. Significant differences between tooth types were found from intra-individual to inter-regional scales for both dental growth rates and isotopic values. The accuracy of season-of-death assessments differed across the island; those in eastern Tasmania were accurate in all instances whereas those in the west showed substantial inaccuracies. We suggest that this may be due to the elodont form of wombat dentition and the ecologically influenced seasonally varied diet in western Tasmania. As the rate of dental growth is positively correlated with the proportion of coarse vegetation within the diet, this seasonal variation is therefore likely to change how annual isotopic signals are incorporated into the enamel. These results highlight the need to understand the degree of species-specific isotopic variation at a range of scales before applying this technique to archaeological or palaeontological assemblages. © 2019
英文关键词	Australia; Marsupial; Modern reference data; δ 13 C; δ 18 O
语种	英语
scopus关键词	archaeology; carbon isotope; data set; fossil record; growth rate; marsupial; oxygen isotope; paleoecology; seasonal variation; stable isotope; tooth; Australia; Tasmania; Animalia; Metatheria; Vombatidae; Vombatus ursinus
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/150985
作者单位	ARC Centre of Excellence for Australian Biodiversity and Heritage, Monash Indigenous Studies Centre, Monash University, Clayton, Victoria 3800, Australia; Department of Archaeology, La Trobe University, Bundoora, Victoria 3083, Australia; Department of Archaeology and Natural History, College of Asia and the Pacific, Australian National University, Canberra, Australian Capital Territory 0200, Australia; Faculty of Science and Technology, Federation University Australia, PO Box 663, Ballarat, VIC 3353, Australia; School of Archaeological and Forensic Sciences, University of Bradford, Bradford, BD7 1DP, United Kingdom; Research School of Earth Sciences, The Australian National University, Acton, ACT 2601, Australia; School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
推荐引用方式 GB/T 7714	Roberts G.L.,Towers J.,Gagan M.K.,et al. Isotopic variation within Tasmanian bare-nosed wombat tooth enamel: Implications for archaeological and palaeoecological research[J],2019,523.
APA	Roberts G.L.,Towers J.,Gagan M.K.,Cosgrove R.,&Smith C..(2019).Isotopic variation within Tasmanian bare-nosed wombat tooth enamel: Implications for archaeological and palaeoecological research.Palaeogeography, Palaeoclimatology, Palaeoecology,523.
MLA	Roberts G.L.,et al."Isotopic variation within Tasmanian bare-nosed wombat tooth enamel: Implications for archaeological and palaeoecological research".Palaeogeography, Palaeoclimatology, Palaeoecology 523(2019).