Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/84521
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Type: Journal article
Title: Methane-carbon flow into the benthic food web at cold seeps - A case study from the Costa Rica subduction zone
Author: Niemann, H.
Peter, L.
Knittel, K.
MacPherson, E.
Antje, B.
Brockmann, W.
Larvik, G.
Wallmann, K.
Schacht, U.
Omoregie, E.
Hilton, D.
Brown, K.
Rehder, G.
Citation: PLoS One, 2013; 8(10):e74894-1-e74894-10
Publisher: Public Library of Science
Issue Date: 2013
ISSN: 1932-6203
1932-6203
Statement of
Responsibility: 
Helge Niemann, Peter Linke, Katrin Knittel, Enrique MacPherson, Antje Boetius, Warner Brückmann, Gaute Larvik, Klaus Wallmann, Ulrike Schacht, Enoma Omoregie, David Hilton, Kevin Brown, Gregor Rehder
Abstract: Cold seep ecosystems can support enormous biomasses of free-living and symbiotic chemoautotrophic organisms that get their energy from the oxidation of methane or sulfide. Most of this biomass derives from animals that are associated with bacterial symbionts, which are able to metabolize the chemical resources provided by the seeping fluids. Often these systems also harbor dense accumulations of non-symbiotic megafauna, which can be relevant in exporting chemosynthetically fixed carbon from seeps to the surrounding deep sea. Here we investigated the carbon sources of lithodid crabs (Paralomis sp.) feeding on thiotrophic bacterial mats at an active mud volcano at the Costa Rica subduction zone. To evaluate the dietary carbon source of the crabs, we compared the microbial community in stomach contents with surface sediments covered by microbial mats. The stomach content analyses revealed a dominance of epsilonproteobacterial 16S rRNA gene sequences related to the free-living and epibiotic sulfur oxidiser Sulfurovum sp. We also found Sulfurovum sp. as well as members of the genera Arcobacter and Sulfurimonas in mat-covered surface sediments where Epsilonproteobacteria were highly abundant constituting 10% of total cells. Furthermore, we detected substantial amounts of bacterial fatty acids such as i-C15:0 and C17:1ω6c with stable carbon isotope compositions as low as −53‰ in the stomach and muscle tissue. These results indicate that the white microbial mats at Mound 12 are comprised of Epsilonproteobacteria and that microbial mat-derived carbon provides an important contribution to the crab's nutrition. In addition, our lipid analyses also suggest that the crabs feed on other 13C-depleted organic matter sources, possibly symbiotic megafauna as well as on photosynthetic carbon sources such as sedimentary detritus.
Keywords: Animals; Anomura; Carbon; Methane; RNA, Bacterial; RNA, Ribosomal, 16S; Ecosystem; Food Chain; Seawater; Costa Rica
Rights: © 2013 Niemann et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
RMID: 0020131895
DOI: 10.1371/journal.pone.0074894
Appears in Collections:Australian School of Petroleum publications

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