气候变化领域集成服务门户(CCPortal): Climate and ecology of the palaeo-Agulhas Plain from stable carbon and oxygen isotopes in bovid tooth enamel from Nelson Bay Cave; South Africa

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DOI	10.1016/j.quascirev.2019.105974
	Climate and ecology of the palaeo-Agulhas Plain from stable carbon and oxygen isotopes in bovid tooth enamel from Nelson Bay Cave; South Africa
	Sealy J.; Naidoo N.; Hare V.J.; Brunton S.; Faith J.T.
发表日期	2020
ISSN	0277-3791
卷号	235
英文摘要	We measured δ13Cenamel and δ18Oenamel in 213 archaeological bovid teeth from Nelson Bay Cave (NBC), spanning the last 22 ka. We also recorded dental mesowear (occlusal relief [high versus low] and cusp shape [sharp, round, or blunt]) of all maxillary first and second molars from NBC. We use these values to explore glacial/interglacial shifts in bovid palaeoecology and to reconstruct aspects of the climate and environment of the Palaeo-Agulhas Plain. Our results indicate that at the time of the Last Glacial Maximum (LGM), there was a significantly greater proportion of C3 (winter-rainfall) grasses, although some C4 (summer rainfall) varieties were present. This conclusion is strengthened by correction for lower pCO2 at the LGM, leading to reduced carbon isotope fractionation in C3 photosynthesis. Terminal Pleistocene and Holocene grazers show a stronger C4 signal. Our findings are consistent with an eastwards extension of winter rainfall at the LGM, as proposed by some previous researchers. Beyond the broad distinction between browsers and grazers, δ13C values reflect species-specific dietary preferences. δ18O is more positive in browsers than grazers, probably due to their deriving a significant proportion of their water intake from evaporatively enriched leaf water. δ18O values do not show significant changes through time. The location of Nelson Bay Cave on the present-day interface between temperate and tropical weather systems means that this area is sensitive to past shifts in the relative importance of these systems. These findings therefore contribute to the reconstruction of past Southern Hemisphere climate dynamics on a glacial/interglacial time scale. © 2019 The Authors
英文关键词	Last glacial maximum; MIS 2; Palaeoecology; Paleoclimatology; Winter rainfall zone
语种	英语
scopus关键词	Carbon; Caves; Ecology; Glacial geology; Isotopes; Oxygen; Tooth enamel; Carbon isotope fractionation; Last Glacial Maximum; Palaeoecology; Paleoclimatology; Southern Hemisphere; Species specifics; Terminal Pleistocene; Winter rainfall; Rain; C3 plant; carbon isotope; cattle; correction; dietary intake; enamel; glacial-interglacial cycle; Holocene; isotopic fractionation; Last Glacial Maximum; oxygen isotope; paleoclimate; paleoecology; photosynthesis; Southern Hemisphere; Agulhas Plain; South Africa; Western Cape; Bovidae; Poaceae
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151513
作者单位	Department of Archaeology, University of Cape Town, Private Bag X3, Rondebosch, Cape Town, 7701, South Africa; Natural History Museum of Utah & Department of Anthropology, University of Utah, Salt Lake City, UT, United States; Department of Geosciences and African Centre for Coastal Palaeoscience, Nelson Mandela University, Port Elizabeth, 6032, South Africa
推荐引用方式 GB/T 7714	Sealy J.,Naidoo N.,Hare V.J.,et al. Climate and ecology of the palaeo-Agulhas Plain from stable carbon and oxygen isotopes in bovid tooth enamel from Nelson Bay Cave; South Africa[J],2020,235.
APA	Sealy J.,Naidoo N.,Hare V.J.,Brunton S.,&Faith J.T..(2020).Climate and ecology of the palaeo-Agulhas Plain from stable carbon and oxygen isotopes in bovid tooth enamel from Nelson Bay Cave; South Africa.Quaternary Science Reviews,235.
MLA	Sealy J.,et al."Climate and ecology of the palaeo-Agulhas Plain from stable carbon and oxygen isotopes in bovid tooth enamel from Nelson Bay Cave; South Africa".Quaternary Science Reviews 235(2020).