Biogeochemistry of a low-activity cold seep in the Larsen B area, western Weddell Sea, Antarctica

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dc.contributor.authorNiemann, H.
dc.contributor.authorFisher, D.
dc.contributor.authorGraffe, D.
dc.contributor.authorKnittel, K.
dc.contributor.authorMontiel, Américo
dc.contributor.authorHeilmayer, O.
dc.contributor.authorKnothen, K.
dc.contributor.authorPape, K.
dc.contributor.authorKasten, S.
dc.contributor.authorBohrmann, G.
dc.contributor.authorBoetius, A.
dc.contributor.authorGutt, J.
dc.contributor.editorKusel, K.
dc.coverage.spatialMar de Weddell
dc.coverage.spatialCrane and Evans Glacier
dc.date.accessioned2017-08-21T21:16:20Z
dc.date.available2017-08-21T21:16:20Z
dc.date.issued2009-11-02
dc.descriptionThis study was conducted within the framework of the Research Center/Cluster of Excellence MARUM “The Ocean in the Earth System” (funded by the Deutsche Forschungsgemeinschaft – DFG) as well as the Census of Marine Life projects Census for Antarctic Marine Life (CAML) and Chemosynthetic Ecosystem Science (CHESS). We thank captain, crew and shipboard scientists of R/V Polarstern cruise ANTXXIII- 8 for excellent support with work at sea. We thank J.-H. Lott and E. Pugacheva from the Alfred Wegener Institute, Bremerhaven and Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow, respectively, for bathymetric measurements and georeferencing. Furthermore, we thank W. Dimmler and H. Bohlmann from FIELAX and ISITEC, Bremerhaven, respectively, for ROV maintenance and operation as well as N. R¨odiger from the Max Planck Institute for Marine Microbiology, Bremen for molecular analyses. We would also like to express our special thanks to E. Domack from the Hamilton College, New York for providing the coordinates and video footage of seafloor observations made in the Larsen B area during the US Antarctic Program cruise in March 2005. Further support was provided by the Helmholtz Association, Max Planck Society and the University of Bremen.es_ES
dc.description.abstractFirst videographic indication of an Antarctic cold seep ecosystem was recently obtained from the collapsed Larsen B ice shelf, western Weddell Sea (Domack et al., 2005). Within the framework of the R/V Polarstern expedition ANTXXIII-8, we revisited this area for geochemical, microbiological and further videographical examinations. During two dives with ROV Cherokee (MARUM, Bremen), several bivalve shell agglomerations of the seep-associated, chemosynthetic clam Calyptogena sp. were found in the trough of the Crane and Evans glacier. The absence of living clam specimens indicates that the flux of sulphide and hence the seepage activity is diminished at present. This impression was further substantiated by our geochemical observations. Concentrations of thermogenic methane were moderately elevated with 2μM in surface sediments of a clam patch, increasing up to 9μM at a sediment depth of about 1m in the bottom sections of the sediment cores. This correlated with a moderate decrease in sulphate from about 28mM at the surface down to 23.4 mM, an increase in sulphide to up to 1.43mM and elevated rates of the anaerobic oxidation of methane (AOM) of up to 600 pmol cm−3 d−1 at about 1m below the seafloor. Molecular analyses indicate that methanotrophic archaea related to ANME-3 are the most likely candidates mediating AOM in sediments of the Larsen B seep.es_ES
dc.identifier.citationBiogeosciences, 6, 2383–2395, 2009es_ES
dc.identifier.issn1726-4189
dc.identifier.urihttp://hdl.handle.net/20.500.11894/918
dc.language.isoenes_ES
dc.publisherCopernicus Publications on behalf of the European Geosciences Uniones_ES
dc.relation.ispartofBiogeoscienceses_ES
dc.rights© Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License.es_ES
dc.subjectCienciaes_ES
dc.subjectR/V Polarstern expedition ANTXXIII-8es_ES
dc.subjectLarsen B ice shelfes_ES
dc.subjectClam Caliptogena Sp.es_ES
dc.titleBiogeochemistry of a low-activity cold seep in the Larsen B area, western Weddell Sea, Antarcticaes_ES
dc.typeArtículoes_ES

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