DOI: 10.1016/j.palaeo.2011.11.015
论文题名: Exploring the calcium isotope signature of Arctica islandica as an environmental proxy using laboratory- and field-cultured specimens
作者: Hippler D. ; Witbaard R. ; van Aken H.M. ; Buhl D. ; Immenhauser A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 373 起始页码: 75
结束页码: 87
语种: 英语
英文关键词: Aragonitic bivalve
; Biomineralization
; Environmental proxy
; Non-traditional stable isotopes
; Temperature-dependent isotope fractionation
英文摘要: The calcium-isotope composition (δ44/40Ca) of the aragonitic bivalve Arctica islandica grown in laboratory and field cultures was investigated in terms of environmental and biological controls to explore its potential as a palaeoceanographic proxy. While we found no significant effect of salinity on Ca-isotope fractionation, the relationship between 44Ca/40Ca ratios of A. islandica and temperature was best explained by a generalised additive model, which describes the temperature versus Ca-isotope relationship as a nonlinear, second-degree polynomial with an optimum temperature of 15°C. Since 44Ca/40Ca ratios clearly increase with increasing temperature up to 15°C, the temperature versus Ca-isotope relation can be approximated through a linear fit up to 15°C. The slope of this linear temperature dependent Ca-isotope fractionation resembles previous calibrations of inorganic and biogenic aragonites, providing insights into fractionation processes during bivalve biomineralization. Our findings suggest that the observed biologically-induced Ca-isotope fractionation occurs when Ca is transported from seawater to the site of mineralization, most likely during the passage through the epithelial mantle. The observed evidence for strong vital effects indicates limited use of Ca isotopes in A. islandica as a temperature proxy. © 2011 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69822
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Sedimentology and Marine Geology, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands; Royal Netherlands Institute for Sea Research, Landsdiep 4, 1797 SZ 't Horntje (Texel), Netherlands; Institute for Geology, Mineralogy and Geophysics, Ruhr-University, Universitätsstrasse 150, 44801 Bochum, Germany
Recommended Citation:
Hippler D.,Witbaard R.,van Aken H.M.,et al. Exploring the calcium isotope signature of Arctica islandica as an environmental proxy using laboratory- and field-cultured specimens[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,373