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Tracking natural organic carbon in the River Clyde, UK, using glycerol dialkyl glycerol tetraethers

Lopes dos Santos, Raquel A.; Vane, Christopher H.

Earth and environmental science transactions of the Royal Society of Edinburgh. Volume 108:Number 2/3 (2018); pp 289-298 -- RSE Scotland Foundation

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  • Title:
    Tracking natural organic carbon in the River Clyde, UK, using glycerol dialkyl glycerol tetraethers
  • Author: Lopes dos Santos, Raquel A.;
    Vane, Christopher H.
  • Found In: Earth and environmental science transactions of the Royal Society of Edinburgh. Volume 108:Number 2/3 (2018); pp 289-298
  • Journal Title: Earth and environmental science transactions of the Royal Society of Edinburgh
  • Subjects: Earth sciences--Periodicals; Earth sciences--Scotland--Periodicals; branched GDGT,--C/N,--crenarchaeol,--Glasgow,--tetraether lipids,--δ13C; Dewey: 550.5
  • Rights: legaldeposit
  • Publication Details: RSE Scotland Foundation
  • Abstract: ABSTRACT:

    Surface sediments from a 100-km stretch of the River Clyde, UK, and its estuary were analysed for glycerol dialkyl glycerol tetraethers (GDGTs) to track the downstream changes in the source of organic matter (OM) and to evaluate the impact of urbanisation. Bacterial membrane lipids, named branched GDGTs (brGDGTs), produced in soils and rivers ranged from 1.6 to 58μgg −1 organic carbon (OC) and the isoprenoid GDGT crenarchaeol, mainly from marine archaea, ranged from 0.01 to 42μgg −1 OC. The highest brGDGT concentrations were in the upper river, in Glasgow city and in the outer estuary, suggesting higher soil-derived OM input. By contrast, crenarchaeol concentrations gradually increased from the tidal weir in Glasgow towards the sea. This spatial distribution of the tetraethers was reflected in the branched and isoprenoid tetraether (BIT) index, a proxy for soil versus marine carbon. The highest BIT values (1.0) occurred upstream, estuarine values ranged from 0.9 to 0.6 and the lowest values (0.4) were found in the outer estuary. An independent proxy for soil-derived OM, stable carbon isotope (δ 13 C) values, showed a comparable decrease in terrigenous OM contribution towards the sea, but was more variable compared to the BIT. Conversely, carbon/nitrogen (C/N) showed a constant trend, suggesting that it is not a reliable indicator of OM source in the Clyde. Neither BIT, δ 13 C nor C/N were able to reflect the input of urban effluents from Glasgow.


  • Identifier: System Number: LDEAvdc_100077580152.0x000001; Journal ISSN: 1755-6910; 10.1017/S175569101800035X
  • Publication Date: 2018
  • Physical Description: Electronic
  • Shelfmark(s): ELD Digital Store

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