Within-sample variability of δ13C and δ18O values of freshwater gastropod shells and the optimum number of shells to measure per sediment layer in the Paddenluch palaeolacustrine sequence, G

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• 作者：Karina Apolinarska ; Mariusz Pe?echaty ; Annette Kossler
• 关键词：C and O isotope variability ; Freshwater gastropod shells ; Sediment sample ; Palaeolimnology ; Quaternary
• 刊名：Journal of Paleolimnology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：54
• 期：4
• 页码：305-323
• 全文大小：6,226 KB
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• 作者单位：Karina Apolinarska (1)
  Mariusz Pe?echaty (2)
  Annette Kossler (3)
  
  1. Institute of Geology, Faculty of Geographical and Geological Studies, Adam Mickiewicz University, Maków Polnych 16, 61-606, Poznan, Poland
  2. Department of Hydrobiology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614, Poznan, Poland
  3. Institute of Geological Sciences, Branch Palaeontology, Freie Universit?t Berlin, Malteserstr. 74-100, 12249, Berlin, Germany
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Sedimentology
  Climate Change
  Physical Geography
  Hydrobiology
  Geology
  
• 出版者：Springer Netherlands
• ISSN：1573-0417

文摘

This study aimed to: (1) investigate intra-sample variability in the stable isotope composition (δ13C and δ18O values) measured in several individual mollusc shells; and (2) determine the optimum number of individual mollusc shells required to obtain stable isotope values representative of the mean climate signal for a sediment sample. Seven hundred and six gastropod shells were analysed, representing eight species. These eight species were most abundant and consistently present in the sediment sequence of the Paddenluch outcrop, Brandenburg, northeast Germany. Significant differences between minimum and maximum δ13C and δ18O values of the shells were recorded within all sediment samples and for all analysed species. Within the sediment samples, the greatest mean variability in both δ13C and δ18O values was found for Hippeutis complanatus, 5.84 and 5.23 - respectively. The greatest intra-specific variability in C and O isotope values within individual sediment samples, however, was 10.2 and 6.8 - respectively. Significant differences between minimum and maximum δ13C and δ18O values of individual mollusc shells within the same sediment sample are probably the result of population isotope variability, variations in species life span, thickness of the sediment sample, sediment accumulation rate, and environmental fluctuations during the time span when the sediment was deposited. Shells were randomly selected to determine the optimum number of shells necessary to obtain stable isotope values that are representative of the mean climate signal, from a 1-cm sample of sediment. For each layer of the Paddenluch sediment sequence, 15 or more shells (N ?nbsp;15) was the required sample size to provide representative isotope values and yield a reliable mean isotope value. Sample sizes with fewer shells displayed more variable mean δ13C and δ18O values. Stable isotope composition of the analyzed molluscs was species-specific, with differences in mean δ13C and δ18O values of 2.5 and 3 - respectively. This illustrates the need to use mono-specific samples throughout a sediment sequence to generate reliable data. Keywords C and O isotope variability Freshwater gastropod shells Sediment sample Palaeolimnology Quaternary