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<front>
<journal-meta>
<journal-id journal-id-type="publisher">BG</journal-id>
<journal-title-group>
<journal-title>Biogeosciences</journal-title>
<abbrev-journal-title abbrev-type="publisher">BG</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">Biogeosciences</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1726-4189</issn>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/bg-6-2383-2009</article-id>
<title-group>
<article-title>Biogeochemistry of a low-activity cold seep in the Larsen B area, western Weddell Sea, Antarctica</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Niemann</surname>
<given-names>H.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Fischer</surname>
<given-names>D.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Graffe</surname>
<given-names>D.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Knittel</surname>
<given-names>K.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Montiel</surname>
<given-names>A.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Heilmayer</surname>
<given-names>O.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Nöthen</surname>
<given-names>K.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Pape</surname>
<given-names>T.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Kasten</surname>
<given-names>S.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Bohrmann</surname>
<given-names>G.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Boetius</surname>
<given-names>A.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Gutt</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Max Planck Institute for Marine Microbiology, Bremen, Germany</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Institute for Environmental Geosciences, University of Basel, Basel, Switzerland</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>MARUM – Center for Marine Environmental Sciences and Department of Geosciences, Univ. of Bremen, Bremen, Germany</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Universidad de Magallanes, Punta Arenas, Chile</addr-line>
</aff>
<aff id="aff6">
<label>6</label>
<addr-line>German Aerospace Centre, Bonn, Germany</addr-line>
</aff>
<pub-date pub-type="epub">
<day>02</day>
<month>11</month>
<year>2009</year>
</pub-date>
<volume>6</volume>
<issue>11</issue>
<fpage>2383</fpage>
<lpage>2395</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2009 H. Niemann et al.</copyright-statement>
<copyright-year>2009</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://bg.copernicus.org/articles/6/2383/2009/bg-6-2383-2009.html">This article is available from https://bg.copernicus.org/articles/6/2383/2009/bg-6-2383-2009.html</self-uri>
<self-uri xlink:href="https://bg.copernicus.org/articles/6/2383/2009/bg-6-2383-2009.pdf">The full text article is available as a PDF file from https://bg.copernicus.org/articles/6/2383/2009/bg-6-2383-2009.pdf</self-uri>
<abstract>
<p>First 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 &lt;I&gt;Calyptogena&lt;/I&gt; 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 2 μM in surface sediments of a clam patch, increasing up to 9 μM
at a sediment depth of about 1 m in the bottom sections of the sediment
cores. This correlated with a moderate decrease in sulphate from about 28 mM
at the surface down to 23.4 mM, an increase in sulphide to up to 1.43 mM and
elevated rates of the anaerobic oxidation of methane (AOM) of up to 600 pmol cm&lt;sup&gt;&amp;minus;3&lt;/sup&gt; d&lt;sup&gt;&amp;minus;1&lt;/sup&gt;
at about 1 m 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.</p>
</abstract>
<counts><page-count count="13"/></counts>
</article-meta>
</front>
<body/>
<back>
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