Contrasting regimes for organic matter degradation in the East Siberian Sea and the Laptev Sea assessed through microbial incubations and molecular markers

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Karlsson, Emma S.Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi (author)

Contrasting regimes for organic matter degradation in the East Siberian Sea and the Laptev Sea assessed through microbial incubations and molecular markers

Article/chapterEnglish2015

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Elsevier BV,2015
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LIBRIS-ID:oai:DiVA.org:su-116604
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-116604URI
https://doi.org/10.1016/j.marchem.2014.12.005DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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AuthorCount:7;
Compositional studies of organic matter on the East Siberian Arctic Shelf (ESAS) suggest that different terrestrial carbon pools have different propensities for transport and/or degradation. The current study combined laboratory-based microbial degradation experiments with earlier published degradation-diagnostic composition of several classes of terrestrial biomarkers on the same sediments to investigate differences and driving forces of terrestrial organic matter (TerrOM) degradation in two biogeochemically-contrasting regimes of the ESAS. The incubation-based anaerobic degradation rates were consistently higher (by average factor of 6) in the East Siberian Sea Kolyma Paleoriver Channel (ESS-KPC) (15 mu mol CO2 g OC-1 day(-1)) compared to the Laptev Sea Buor-Khaya Bay (LS-BKB) (2.4 mu mol CO2 g OC-1 day(-1)). The reported molecular markers show similarities between the terrestrial carbon pools in the two systems, but impose contrasting degradation regimes in combination with the incubation results. For the LS-BKB, there was a strong relationship between the degradation rates and the three lignin phenol-based degradation proxies (r(2) = 0.93-0.96, p < 0.01, linear regression) and two wax lipid-based degradation proxies (r(2) = 0.71 and 0.66, p < 0.05, linear regression). In contrast, for the ESS-KPC system, there was no relationship between incubation-based degradation rates and molecular marker-based degradation status of TerrOM. A principal component analysis indicated that short-chain fatty acids and dicarboxylic acids from CuO oxidation are mainly of terrestrial origin in the LS-BKB, but mainly of marine origin in the ESS-KPC. Hence, the microbial degradation in the western (LS-BKB) system appears to be fueled by TerrOM whereas the eastern (ESS-KPC) system degradation appears to be driven by MarOM. By combining molecular fingerprinting of TerrOM degradation state with laboratory-based degradation studies on the same ESAS sediments, a picture evolves of two distinctly different modes of TerrOM degradation in different parts of the ESAS system.

Subject headings and genre

NATURVETENSKAP Kemi hsv//swe
NATURAL SCIENCES Chemical Sciences hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Oceanography, Hydrology and Water Resources hsv//eng
Organic matter lability
Reactivity
Decomposition
Remineralization
Terrestrial organic carbon
Incubations
Arctic Ocean
Coastal shelf
Continental margin
Permafrost
Wax lipids
Lignin
CuO oxidation
Organic geochemistry
Sediment
Applied Environmental Science
tillämpad miljövetenskap

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Bruchert, VolkerStockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)vbruc (author)
Tesi, TommasoStockholms universitet,Institutionen för miljövetenskap och analytisk kemi(Swepub:su)ttesi (author)
Charkin, A. (author)
Dudarev, O. (author)
Semiletov, I. (author)
Gustafsson, ÖrjanStockholms universitet,Institutionen för miljövetenskap och analytisk kemi(Swepub:su)ogust (author)
Stockholms universitetInstitutionen för miljövetenskap och analytisk kemi (creator_code:org_t)

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In:Marine Chemistry: Elsevier BV170, s. 11-220304-42031872-7581

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Oceanography Hyd ...

Articles in the publication: Marine Chemistry

By the university: Stockholm University

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