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(Article of periodic en Anglais - 2014)

Document title

Impact of lake-level and climate changes on microbial communities in a terrestrial permafrost sequence of the El'gygytgyn Crater, Far East Russian Arctic

Authors(s) and Affiliation(s)

BISCHOFF J. (1 2) ; MANGELSDORF K. (2) ; SCHWAMBORN G. (1) ; WAGNER D. (3) ;
(1) Alfred Wegener Inst. for Polar and Marine Research, Research Unit, Potsdam, ALLEMAGNE
(2) GFZ, German Research Centre for Geosciences, Organic Geochemistry, Postdam, ALLEMAGNE
(3) GFZ, German Research Centre for Geosciences, Section 4.5 Geomicrobiology, Postdam, ALLEMAGNE

Abstract

The AA. investigated the changing distribution of permafrost microorganisms in response to climate and lake-level changes. The permafrost core was drilled at the near shore of Lake El'gygytgyn, and a combined microbiological and lipid biomarker approach was applied. The lower part of the permafrost core, deposited under subaquatic conditions, contains only small amounts of microbial signals; total organic carbon (TOC) content is sparse. After exposure of the site to subaerial conditions during the Allerød, the abundance of Bacteria and Archaea started to increase and the lake-level change is evidenced by the relative proportion of archaeal biomarkers. After a small decrease during the colder Younger Dryas, the TOC content and the microbial signals strongly increase during the Holocene, presumably stimulated by pedogenesis. The data suggest that methane formation is mainly expected for the subaerial interval, especially the Holocene where methanogens were identified by fingerprinting. This study emphasises the role of the uppermost permafrost deposits as a hotspot of carbon cycling in arctic environments, especially in the light of expected future global warming

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2014, vol. 25, no2 [pp. 107-116]

Bibliographic references : 2 p.

Collation : 4 fig.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1807

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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