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      Interpretation and application of carbon isotope ratios in freshwater diatom silica

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          ABSTRACT

          Carbon incorporated into diatom frustule walls is protected from degradation enabling analysis for carbon isotope composition (δ 13C diatom). This presents potential for tracing carbon cycles via a single photosynthetic host with well‐constrained ecophysiology. Improved understanding of environmental processes controlling carbon delivery and assimilation is essential to interpret changes in freshwater δ 13C diatom. Here relationships between water chemistry and δ 13C diatom from contemporary regional data sets are investigated. Modern diatom and water samples were collected from river catchments within England and lake sediments from across Europe. The data suggest dissolved, biogenically produced carbon supplied proportionately to catchment productivity was critical in the rivers and soft water lakes. However, dissolved carbon from calcareous geology overwhelmed the carbon signature in hard water catchments. Both results demonstrate carbon source characteristics were the most important control on δ 13C diatom, with a greater impact than productivity. Application of these principles was made to a sediment record from Lake Tanganyika. δ 13C diatom co‐varied with δ 13C bulk through the last glacial and Holocene. This suggests carbon supply was again dominant and exceeded authigenic demand. This first systematic evaluation of contemporary δ 13C diatom controls demonstrates that diatoms have the potential to supply a record of carbon cycling through lake catchments from sediment records over millennial timescales.

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          Developing a methodology for carbon isotope analysis of lacustrine diatoms

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            High‐resolution record of climate stability in France during the last interglacial period

            (2001)
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              Author and article information

              Journal
              J Quat Sci
              J Quat Sci
              10.1002/(ISSN)1099-1417
              JQS
              Journal of Quaternary Science
              John Wiley and Sons Inc. (Hoboken )
              0267-8179
              1099-1417
              17 June 2016
              May 2016
              : 31
              : 4 , Quaternary palaeoenvironmental proxies and processes – papers in honour of Professor Alayne Street‐Perrott ( doiID: 10.1002/jqs.v31.4 )
              : 300-309
              Affiliations
              [ 1 ] Lancaster Environment CentreUniversity of Lancaster LancasterUK
              [ 2 ] Institute of Plant Sciences and Oeschger Centre for Climate Change ResearchUniversity of Bern BernSwitzerland
              [ 3 ] Geography and EnvironmentUniversity of Southampton SouthamptonUK
              [ 4 ] STREAM Industrial Doctorate CentreUniversity of Sheffield SheffieldUK
              [ 5 ] Department of Earth, Environmental and Planetary SciencesBrown University Providence RIUSA
              [ 6 ] Stable Isotope FacilityNERC Centre for Ecology & Hydrology, Lancaster Environment Centre LancasterUK
              [ 7 ] NERC Isotope Geosciences FacilitiesBritish Geological Survey NottinghamUK
              [ 8 ] Centre for Environmental Geochemistry School of GeographyUniversity of Nottingham NottinghamUK
              Author notes
              [* ] Correspondence to: P. A. Barker, as above.

              E‐mail: p.barker@ 123456lancaster.ac.uk

              Article
              JQS2837
              10.1002/jqs.2837
              5014241
              Copyright © 2016 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd.

              This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

              Page count
              Pages: 10
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              Special Issue Article
              Special Issue Articles
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              2.0
              jqs2837
              May 2016
              Converter:WILEY_ML3GV2_TO_NLMPMC version:4.9.4 mode:remove_FC converted:31.08.2016

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