Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean)
This thesis aims at achieving deeper insights into the ecological functioning of heterotrophic microbial communities in high northern latitude deep-sea sediments, i.e. their structural and functional response to a sudden large input of particulate organic matter (POM).Three in situ studies, each div...
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Universität Bremen
2008
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Online Access: | https://media.suub.uni-bremen.de/handle/elib/2476 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000109658 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2476 2023-05-15T14:51:14+02:00 Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean) Reaktion benthischer mikrobieller Tiefsee-Gemeinschaften auf den Eintrag von partikulärem organischen Material: In situ Experimente in der Framstrasse (Arktischer Ozean) Kanzog, Corinna Kirst, Gunter-Otto Klages, Michael. Klages, Michael 2008-04-25 application/pdf https://media.suub.uni-bremen.de/handle/elib/2476 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000109658 eng eng Universität Bremen FB2 Biologie/Chemie https://media.suub.uni-bremen.de/handle/elib/2476 urn:nbn:de:gbv:46-diss000109658 info:eu-repo/semantics/openAccess Deep sea Arctic Benthic microbial communities Chitin Microbial colonisation Sediments 570 570 Life sciences biology ddc:570 Dissertation doctoralThesis 2008 ftsubbremen 2022-11-09T07:09:49Z This thesis aims at achieving deeper insights into the ecological functioning of heterotrophic microbial communities in high northern latitude deep-sea sediments, i.e. their structural and functional response to a sudden large input of particulate organic matter (POM).Three in situ studies, each divided into a short- (seven days) and long-term experiment (one year), were carried out by using a Sediment Tray Free Vehicle (STFV) which was deployed in the Arctic Ocean at the experimental site of the deep-sea long-term observatory HAUSGARTEN (Fram Strait, 2500 m water depth). Special emphasis was placed on the enrichment of deep-sea sediments with chitin as one of the most important biopolymer in aquatic ecosystems. Additionally, experiments were carried out in association with different sediment types (deep-sea sediments, glass beads, coarse sand) to assess how variations in sediment characteristics (e.g. particle size, particle shape, organic carbon content) affect the microbial response to POM supply.Different microbial parameters (cell number, biomass, hydrolytic enzyme potential) were measured and bacterial community composition was determined by using the fingerprint method of terminal-restriction fragment length polymorphism (T-RFLP).Results evidenced clear chitin-dependent response of benthic microbial communities in the deep Arctic Ocean and underlined their important role in recycling this highly insoluble organic substrate. Their functional in situ response following a large chitin input may be triggered by an initial change in community structure before efficient utilisation of chitin compounds can be made. Sediment type was found to be a significant factor influencing enzymatic activity and structure of deep-sea microbial communities. Overall, findings from these in situ studies demonstrated the important role of environmental conditions such as POM availability for driving microbial functioning and diversity at the Arctic deep seafloor. Doctoral or Postdoctoral Thesis Arctic Arctic Ocean Arktis* Fram Strait Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Arctic Arctic Ocean |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Deep sea Arctic Benthic microbial communities Chitin Microbial colonisation Sediments 570 570 Life sciences biology ddc:570 |
spellingShingle |
Deep sea Arctic Benthic microbial communities Chitin Microbial colonisation Sediments 570 570 Life sciences biology ddc:570 Kanzog, Corinna Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean) |
topic_facet |
Deep sea Arctic Benthic microbial communities Chitin Microbial colonisation Sediments 570 570 Life sciences biology ddc:570 |
description |
This thesis aims at achieving deeper insights into the ecological functioning of heterotrophic microbial communities in high northern latitude deep-sea sediments, i.e. their structural and functional response to a sudden large input of particulate organic matter (POM).Three in situ studies, each divided into a short- (seven days) and long-term experiment (one year), were carried out by using a Sediment Tray Free Vehicle (STFV) which was deployed in the Arctic Ocean at the experimental site of the deep-sea long-term observatory HAUSGARTEN (Fram Strait, 2500 m water depth). Special emphasis was placed on the enrichment of deep-sea sediments with chitin as one of the most important biopolymer in aquatic ecosystems. Additionally, experiments were carried out in association with different sediment types (deep-sea sediments, glass beads, coarse sand) to assess how variations in sediment characteristics (e.g. particle size, particle shape, organic carbon content) affect the microbial response to POM supply.Different microbial parameters (cell number, biomass, hydrolytic enzyme potential) were measured and bacterial community composition was determined by using the fingerprint method of terminal-restriction fragment length polymorphism (T-RFLP).Results evidenced clear chitin-dependent response of benthic microbial communities in the deep Arctic Ocean and underlined their important role in recycling this highly insoluble organic substrate. Their functional in situ response following a large chitin input may be triggered by an initial change in community structure before efficient utilisation of chitin compounds can be made. Sediment type was found to be a significant factor influencing enzymatic activity and structure of deep-sea microbial communities. Overall, findings from these in situ studies demonstrated the important role of environmental conditions such as POM availability for driving microbial functioning and diversity at the Arctic deep seafloor. |
author2 |
Kirst, Gunter-Otto Klages, Michael. Klages, Michael |
format |
Doctoral or Postdoctoral Thesis |
author |
Kanzog, Corinna |
author_facet |
Kanzog, Corinna |
author_sort |
Kanzog, Corinna |
title |
Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean) |
title_short |
Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean) |
title_full |
Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean) |
title_fullStr |
Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean) |
title_full_unstemmed |
Response of deep-sea benthic microbial communities to particulate organic matter supply: In situ experiments in the Fram Strait (Arctic Ocean) |
title_sort |
response of deep-sea benthic microbial communities to particulate organic matter supply: in situ experiments in the fram strait (arctic ocean) |
publisher |
Universität Bremen |
publishDate |
2008 |
url |
https://media.suub.uni-bremen.de/handle/elib/2476 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000109658 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Arktis* Fram Strait |
genre_facet |
Arctic Arctic Ocean Arktis* Fram Strait |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/2476 urn:nbn:de:gbv:46-diss000109658 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766322287200436224 |