Interpretation and application of carbon isotope ratios in freshwater diatom silica

Webb, Megan and Barker, Philip A. and Wynn, Peter M. and Heiri, Oliver and van Hardenbroek, Maarten and Pick, Frances and Russell, James M. and Stott, Andy W. and Leng, Melanie J.. (2016) Interpretation and application of carbon isotope ratios in freshwater diatom silica. JOURNAL OF QUATERNARY SCIENCE, 31 (4). pp. 300-309.

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Official URL: https://edoc.unibas.ch/67695/

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Carbon incorporated into diatom frustule walls is protected from degradation enabling analysis for carbon isotope composition (C-13(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 C-13(diatom). Here relationships between water chemistry and C-13(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 C-13(diatom), with a greater impact than productivity. Application of these principles was made to a sediment record from Lake Tanganyika. C-13(diatom) co-varied with C-13(bulk) through the last glacial and Holocene. This suggests carbon supply was again dominant and exceeded authigenic demand. This first systematic evaluation of contemporary C-13(diatom) controls demonstrates that diatoms have the potential to supply a record of carbon cycling through lake catchments from sediment records over millennial timescales. Copyright (C) 2016 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Geoökologie (Heiri)
UniBasel Contributors:Heiri, Oliver
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:18 May 2020 19:15
Deposited On:18 May 2020 19:15

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