Rates and signatures of methane turnover in sediments of continental margins
In this thesis, a variety of different cold seep systems (mud volcanoes and a gas seep) were investigated using a multidisciplinary approach to gain a more systematic understanding of these, methane-driven biogeosystems. The main goals were the detection and quantification of hot spots of methane ox...
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Universität Bremen
2005
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2163 2023-05-15T15:39:11+02:00 Rates and signatures of methane turnover in sediments of continental margins Methanumsatzraten und dessen Signaturen in Kontinentalrandsedimenten Niemann, Helge Boetius, Antje Elvert, Marcus Wolf-Gladrow, Dieter 2005-07-08 application/pdf https://media.suub.uni-bremen.de/handle/elib/2163 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000100797 eng eng Universität Bremen FB2 Biologie/Chemie https://media.suub.uni-bremen.de/handle/elib/2163 urn:nbn:de:gbv:46-diss000100797 info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) CC-BY continental margin cold seep methane anaerobic oxidation of methane AOM sulphate reduction biogeochemistry green hous gas biomarker archaea ANME mud volcano Haakon Mosby Mud Volcano Tommeliten Gulf of Cadiz pockmark 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2005 ftsubbremen 2022-11-09T07:09:45Z In this thesis, a variety of different cold seep systems (mud volcanoes and a gas seep) were investigated using a multidisciplinary approach to gain a more systematic understanding of these, methane-driven biogeosystems. The main goals were the detection and quantification of hot spots of methane oxidation as well as an assessment of environmental factors determining the activity and the distribution of methanotrophic communities. Furthermore, key microbial players were identified and the impact of Anaerobic Oxidation Of Methane (AOM) and Aerobic Oxidation Of Methane (MOx) on the surrounding, marine environment was studied. The investigations revealed the following:1. Submarine mud volcanoes are colonized by specialized microbial communities utilizing the fluxes of reduced substrates such as methane and sulphide as energy source. At the actively methane-seeping Haakon Mosby mud volcano (HMMV, Barents Sea), a distinct spatial zonation of several novel clades of free-living and symbiotic aerobic and anaerobic methanotrophs was found. The main selection mechanism determining vertical and horizontal distribution and dominance of the methanotrophic communities were fluid flow rates controlling access to electron acceptors for methane oxidation. 2. The analysis of archaeal and bacterial specific lipid concentrations and their associated delta 13C-values from three seepage areas at HMMV (thermal centre, grey mats and Beggiatoa site) showed a distinct distribution of methanotrophic biomass. At the centre, MOx mediated by a type I methanotroph was the primary biomass-generating process in surface sediments. In patches of reduced sediment, covered by greyish, thiotrophic, microbial mats at the boundary of the centre, a four-fold increase in 13C-depleted lipids specific for anaerobic methanotrophs, gave evidence of active microbial communities, which mediate AOM in the upper 20 cm of sediment. Further away from the centre, in the zone covered by Beggiatoa mats, sharp, vertical gradients of 13C-depleted archaeal and ... Doctoral or Postdoctoral Thesis Barents Sea Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Barents Sea Tommeliten ENVELOPE(15.297,15.297,77.442,77.442) |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
continental margin cold seep methane anaerobic oxidation of methane AOM sulphate reduction biogeochemistry green hous gas biomarker archaea ANME mud volcano Haakon Mosby Mud Volcano Tommeliten Gulf of Cadiz pockmark 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
continental margin cold seep methane anaerobic oxidation of methane AOM sulphate reduction biogeochemistry green hous gas biomarker archaea ANME mud volcano Haakon Mosby Mud Volcano Tommeliten Gulf of Cadiz pockmark 550 550 Earth sciences and geology ddc:550 Niemann, Helge Rates and signatures of methane turnover in sediments of continental margins |
topic_facet |
continental margin cold seep methane anaerobic oxidation of methane AOM sulphate reduction biogeochemistry green hous gas biomarker archaea ANME mud volcano Haakon Mosby Mud Volcano Tommeliten Gulf of Cadiz pockmark 550 550 Earth sciences and geology ddc:550 |
description |
In this thesis, a variety of different cold seep systems (mud volcanoes and a gas seep) were investigated using a multidisciplinary approach to gain a more systematic understanding of these, methane-driven biogeosystems. The main goals were the detection and quantification of hot spots of methane oxidation as well as an assessment of environmental factors determining the activity and the distribution of methanotrophic communities. Furthermore, key microbial players were identified and the impact of Anaerobic Oxidation Of Methane (AOM) and Aerobic Oxidation Of Methane (MOx) on the surrounding, marine environment was studied. The investigations revealed the following:1. Submarine mud volcanoes are colonized by specialized microbial communities utilizing the fluxes of reduced substrates such as methane and sulphide as energy source. At the actively methane-seeping Haakon Mosby mud volcano (HMMV, Barents Sea), a distinct spatial zonation of several novel clades of free-living and symbiotic aerobic and anaerobic methanotrophs was found. The main selection mechanism determining vertical and horizontal distribution and dominance of the methanotrophic communities were fluid flow rates controlling access to electron acceptors for methane oxidation. 2. The analysis of archaeal and bacterial specific lipid concentrations and their associated delta 13C-values from three seepage areas at HMMV (thermal centre, grey mats and Beggiatoa site) showed a distinct distribution of methanotrophic biomass. At the centre, MOx mediated by a type I methanotroph was the primary biomass-generating process in surface sediments. In patches of reduced sediment, covered by greyish, thiotrophic, microbial mats at the boundary of the centre, a four-fold increase in 13C-depleted lipids specific for anaerobic methanotrophs, gave evidence of active microbial communities, which mediate AOM in the upper 20 cm of sediment. Further away from the centre, in the zone covered by Beggiatoa mats, sharp, vertical gradients of 13C-depleted archaeal and ... |
author2 |
Boetius, Antje Elvert, Marcus Wolf-Gladrow, Dieter |
format |
Doctoral or Postdoctoral Thesis |
author |
Niemann, Helge |
author_facet |
Niemann, Helge |
author_sort |
Niemann, Helge |
title |
Rates and signatures of methane turnover in sediments of continental margins |
title_short |
Rates and signatures of methane turnover in sediments of continental margins |
title_full |
Rates and signatures of methane turnover in sediments of continental margins |
title_fullStr |
Rates and signatures of methane turnover in sediments of continental margins |
title_full_unstemmed |
Rates and signatures of methane turnover in sediments of continental margins |
title_sort |
rates and signatures of methane turnover in sediments of continental margins |
publisher |
Universität Bremen |
publishDate |
2005 |
url |
https://media.suub.uni-bremen.de/handle/elib/2163 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000100797 |
long_lat |
ENVELOPE(15.297,15.297,77.442,77.442) |
geographic |
Barents Sea Tommeliten |
geographic_facet |
Barents Sea Tommeliten |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/2163 urn:nbn:de:gbv:46-diss000100797 |
op_rights |
info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) |
op_rightsnorm |
CC-BY |
_version_ |
1766370657632780288 |