Biogeochemical investigation of sediments at the Hakon Mosby Mud Volcano (Barents Sea) ...

• Main Authors: Lichtschlag, Anna, Felden, Janine, Brüchert, Volker, Boetius, Antje, de Beer, Dirk
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2009
• Subjects: Push corer; Microsensor profiler; MultiCorer; VICKING; Pourquoi Pas ? 2005; Hotspot Ecosystem Research on the Margins of European Seas HERMES; Barents Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.715022; https://doi.pangaea.de/10.1594/PANGAEA.715022

We have investigated if in a cold seep methane or sulfide is used for chemosynthetic primary production and if significant amounts of the sulfide produced by anaerobic oxidation of methane are oxidized geochemically and hence are not available for chemosynthetic production. Geochemically controlled redox reactions and biological turnover were compared in different habitats of the Håkon Mosby Mud Volcano. The center of the mud volcano is characterized by the highest fluid flow, and most primary production by the microbial community depends on oxidation of methane. The small amount of sulfide produced is oxidized geochemically with oxygen or is precipitated with dissolved iron. In the medium flow peripheral Beggiatoa habitat sulfide is largely oxidized biologically. The oxygen and nitrate supply is high enough that Beggiatoa can oxidize the sulfide completely, and chemical sulfide oxidation or precipitation is not important. An internally stored nitrate reservoir with average concentrations of 110 mmol L-1 ... : Supplement to: Lichtschlag, Anna; Felden, Janine; Brüchert, Volker; Boetius, Antje; de Beer, Dirk (2010): Geochemical processes and chemosynthetic primary production in different thiotrophic mats of the Hakon Mosby Mud Volcano (Barents Sea). Limnology and Oceanography, 55(2), 931-949 ...