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Evaluating the efficacy of the mollusc Tridacna crocea for reconstructing ancient sea‐surface temperatures in the Rock Islands of Palau, Micronesia
Archaeology in Oceania ( IF 1.276 ) Pub Date : 2019-05-05 , DOI: 10.1002/arco.5182
NICHOLAS P. JEW 1 , TAYLOR DODRILL 2 , SCOTT M. FITZPATRICK 3
Affiliation  

Previous stable isotope studies for shellfish collected in waters surrounding the Palauan archipelago (north‐western tropical Pacific) have demonstrated that various local shellfish taxa may be reliable recorders of their ambient water temperatures from modern and archaeological contexts. In this study, we analysed stable oxygen isotope (δ18O) signatures of Tridacna crocea from the archaeological site of Metuker ra Bisech (B:IR‐2:24) to reconstruct average nearshore sea‐surface temperatures (SST) from two components dated to c.560 and 120 calBP. Modern shellfish samples and environmental data were collected from intertidal zones on nearby Orrak Island to provide a modern analogue. These shells were tested using X‐ray diffraction to ensure no secondary recrystallisation of the aragonitic structure. Uncontaminated samples were measured for δ18O to pair with recorded SST. The most appropriate oxygen isotope‐to‐SST conversion formula was then applied to δ18O signatures from archaeological T. crocea to estimate SST averages. The results of this study indicate that T. crocea accurately records ambient SST and is a good proxy for palaeotemperature reconstruction. Our results were compared to previous isotopic studies on Palauan taxa collected to identify regional changes to SST through time, thus allowing for comparisons between human subsistence practices, resource availability and past palaeoenvironments.

中文翻译:

评估软体动物Tridacna crocea重建密克罗尼西亚帕劳岩岛的古代海表温度的功效

先前对帕劳群岛(西北热带太平洋)周围水域中收集的贝类进行的稳定同位素研究表明,从现代和考古学角度来看,各种当地贝类类可能是其周围水温的可靠记录器。在这项研究中,我们分析了稳定氧同位素(δ 18O)来自Metuker ra Bisech(B:IR-2:24)考古现场的大头藻Tridacna crocea的签名,从日期为c.560和120 calBP的两个分量重建近岸海表平均温度(SST)。从附近的奥拉克岛(Orrak Island)潮间带收集了现代贝类样品和环境数据,以提供现代类似物。使用X射线衍射对这些壳进行了测试,以确保文石结构没有二次重结晶。对于δ测量未被污染样品18 O操作对与记录SST。然后,将最合适的氧同位素到SST转换公式应用于δ 18个从考古ø签名Ť 。crocea估算SST平均值。这项研究的结果表明,Ť。crocea准确地记录了周围的SST,是古温度重建的一个很好的代表。我们的结果与先前收集的有关Pala琉分类群的同位素研究进行了比较,以鉴定随时间变化的SST区域变化,从而可以比较人类的生计实践,资源可用性和过去的古环境。
更新日期:2019-05-05
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