A climatic chamber experiment to test the short term effect of increasing temperature on branched GDGT distribution in Sphagnum peat

Branched glycerol dialkyl glycerol tetraethers (br GDGTs) are membrane lipids produced by unknown Bacteria and are being increasingly used as temperature proxies. Nevertheless, the direct effect of temperature on br GDGT distributions has been rarely evaluated. In this study, the impact of increasin...

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Bibliographic Details
Published in:Organic geochemistry 2014-08, Vol.73, p.109-112
Main Authors: Huguet, Arnaud, Francez, André-Jean, Jusselme, My Dung, Fosse, Céline, Derenne, Sylvie
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biodiversity and Ecology
Biological and medical sciences
Branched GDGTs
Earth sciences
Earth, ocean, space
Environmental Sciences
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Incubation
Marine and continental quaternary
Sphagnum peat
Surficial geology
Synecology
Temperature
Terrestrial ecosystems
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Summary:Branched glycerol dialkyl glycerol tetraethers (br GDGTs) are membrane lipids produced by unknown Bacteria and are being increasingly used as temperature proxies. Nevertheless, the direct effect of temperature on br GDGT distributions has been rarely evaluated. In this study, the impact of increasing temperature on br GDGT distributions and the speed of adaptation of br GDGT source microorganisms to temperature change were investigated by analysing br GDGTs in Sphagnum peat cores incubated under controlled conditions at two different temperatures – 12 and 15°C – for 1yr. Br GDGTs present as intact polar lipids (IPLs, presumably derived from recently active microorganims) and core lipids (CLs, derived from dead biomass) were analysed. There were no significant differences in the relative abundances of the most abundant br GDGTs in the CL and IPL pools after 3months’ incubation. In contrast, the distribution of the br GDGT IPLs was significantly affected by temperature after 1yr, whereas no change was observed in the CL fraction. This suggests that (i) the CL pool of br GDGTs has a turnover of at least 1yr in peat and (ii) br GDGT source microorganisms rapidly adjust their membrane lipid composition (in>3months and
ISSN:0146-6380
1873-5290
DOI:10.1016/j.orggeochem.2014.05.010