DOI: 10.1016/j.palaeo.2016.12.010
论文题名: Investigating δ18O of Turbo sarmaticus (L. 1758) as an indicator of sea surface temperatures
作者: Galimberti M. ; Loftus E. ; Sealy J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 484 起始页码: 62
结束页码: 69
语种: 英语
英文关键词: Gastropod
; Paleotemperature calibration
; Seasonal exploitation
; Shell carbonate
; Shell stable isotope
; Temperature reconstruction
英文摘要: The large marine gastropod Turbo sarmaticus was (and still is) an important food item for coastal foragers along the south coast of South Africa. Opercula of this species are well-preserved in both Holocene and Pleistocene archaeological sites, offering the opportunity to reconstruct past sea surface temperatures from δ18O of shell carbonate over much of the last glacial cycle. We have analysed δ18O and δ13C in 16 opercula and one shell of modern animals collected alive from an area with good SST records, in order to explore how reliably this species records water temperature through the year and to investigate possible ‘vital effects’ that may influence the isotope record. We find that T. sarmaticus deposits aragonite in both operculum and shell in oxygen isotopic equilibrium with seawater. Operculum δ18O values of this species reliably reflect water temperatures between c.14 and 24 °C, although they do not always capture temperature extremes, especially in winter, likely due to slower growth under stressful growth conditions. These thresholds probably alter according to factors such as variations in nutrient supply. The averaged maximum and minimum values across the set of sixteen serially sampled opercula very closely approximate the temperatures of the warmest and coolest months and therefore provide a good measure of the seasonal temperature range, and of mean annual SST. δ18O of edge increments can, to some extent, be used to indicate season of collection, within the broad categories of warmer/cooler seasons. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67760
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Archaeology, University of Cape Town, Private Bag X3, Rondebosch, South Africa; Research Laboratory for Archaeology and History of Art, University of Oxford, South Parks Road, Oxford, United Kingdom
Recommended Citation:
Galimberti M.,Loftus E.,Sealy J.. Investigating δ18O of Turbo sarmaticus (L. 1758) as an indicator of sea surface temperatures[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,484