Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics
Sea ice, at its maximum extent, is one of the largest biomes on Earth. In addition to the polar oceans, it covers extensive sea areas at lower latitudes such as the Baltic Sea and the Sea of Okhotsk. During ice formation, organic and inorganic components in the parent seawater are concentrated into...
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Helsingin yliopisto
2015
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/154541 2023-08-20T04:04:54+02:00 Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics Eronen-Rasimus, Eeva Bowman, John University of Helsinki, Faculty of Agriculture and Forestry, Department of Food and Environmental Sciences, Mikrobiologian ja biotekniikan osasto Finnish Environment Institute, Marine Centre;Tvärminne Zoological Station, University of Helsinki Helsingin yliopisto, maatalous-metsätieteellinen tiedekunta, elintarvike- ja ympäristötieteiden laitos Helsingfors universitet, agrikultur-forstvetenskapliga fakulteten, institutionen för livsmedels- och miljövetenskaper Kaartokallio, Hermanni Lyra, Christina 2015-05-08T11:58:42Z application/pdf http://hdl.handle.net/10138/154541 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-67851-7-2 Helsinki: Unigrafia, 2015, W. and A. de Nottbeck Foundation Sci Rep . 0358-6758 http://hdl.handle.net/10138/154541 URN:ISBN:978-952-67851-8-9 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. mikrobiologia Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2015 ftunivhelsihelda 2023-07-28T06:36:55Z Sea ice, at its maximum extent, is one of the largest biomes on Earth. In addition to the polar oceans, it covers extensive sea areas at lower latitudes such as the Baltic Sea and the Sea of Okhotsk. During ice formation, organic and inorganic components in the parent seawater are concentrated into saline brines within the ice, which serve as a habitat for diverse auto- and heterotrophic organisms, including bacteria. Sea-ice bacteria are responsible for many biogeochemical processes, such as decomposition of particulate organic matter, recycling of dissolved organic matter and remineralization of nutrients, analogously to bacterially driven biogeochemical processes in the water column. Since bacterial groups vary by their metabolic traits and participation in biogeochemical processes, knowledge of the bacterial community structure and its seasonal variation is essential for an understanding of ice biogeochemistry. This thesis characterises sea-ice bacterial communities during ice formation and during the winter/spring transition phase when the community composition is poorly known. Bacterial communities in Arctic and Baltic sea ice during the winter/spring transition were studied and compared. In addition, the effect of the dissolved organic matter regime on bacterial community formation was investigated in an experimental sea-ice system with North Sea water. The main methods applied were terminal-restriction fragment length polymorphism and/or Illumina Miseq sequencing together with bacterial production and abundance measurements. During the early stages of sea-ice formation, the bacterial communities were similar to the parent water communities, suggesting that the parent water determines the initial sea-ice bacterial community composition. After congealment of the sea ice, the bacterial communities changed towards communities typical of sea ice in spring. During the winter/spring transition, members of the classes Flavobacteriia (formerly Flavobacteria), Gammaproteobacteria and Alphaproteobacteria were ... Doctoral or Postdoctoral Thesis Arctic Sea ice Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Arctic Okhotsk |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
mikrobiologia |
spellingShingle |
mikrobiologia Eronen-Rasimus, Eeva Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics |
topic_facet |
mikrobiologia |
description |
Sea ice, at its maximum extent, is one of the largest biomes on Earth. In addition to the polar oceans, it covers extensive sea areas at lower latitudes such as the Baltic Sea and the Sea of Okhotsk. During ice formation, organic and inorganic components in the parent seawater are concentrated into saline brines within the ice, which serve as a habitat for diverse auto- and heterotrophic organisms, including bacteria. Sea-ice bacteria are responsible for many biogeochemical processes, such as decomposition of particulate organic matter, recycling of dissolved organic matter and remineralization of nutrients, analogously to bacterially driven biogeochemical processes in the water column. Since bacterial groups vary by their metabolic traits and participation in biogeochemical processes, knowledge of the bacterial community structure and its seasonal variation is essential for an understanding of ice biogeochemistry. This thesis characterises sea-ice bacterial communities during ice formation and during the winter/spring transition phase when the community composition is poorly known. Bacterial communities in Arctic and Baltic sea ice during the winter/spring transition were studied and compared. In addition, the effect of the dissolved organic matter regime on bacterial community formation was investigated in an experimental sea-ice system with North Sea water. The main methods applied were terminal-restriction fragment length polymorphism and/or Illumina Miseq sequencing together with bacterial production and abundance measurements. During the early stages of sea-ice formation, the bacterial communities were similar to the parent water communities, suggesting that the parent water determines the initial sea-ice bacterial community composition. After congealment of the sea ice, the bacterial communities changed towards communities typical of sea ice in spring. During the winter/spring transition, members of the classes Flavobacteriia (formerly Flavobacteria), Gammaproteobacteria and Alphaproteobacteria were ... |
author2 |
Bowman, John University of Helsinki, Faculty of Agriculture and Forestry, Department of Food and Environmental Sciences, Mikrobiologian ja biotekniikan osasto Finnish Environment Institute, Marine Centre;Tvärminne Zoological Station, University of Helsinki Helsingin yliopisto, maatalous-metsätieteellinen tiedekunta, elintarvike- ja ympäristötieteiden laitos Helsingfors universitet, agrikultur-forstvetenskapliga fakulteten, institutionen för livsmedels- och miljövetenskaper Kaartokallio, Hermanni Lyra, Christina |
format |
Doctoral or Postdoctoral Thesis |
author |
Eronen-Rasimus, Eeva |
author_facet |
Eronen-Rasimus, Eeva |
author_sort |
Eronen-Rasimus, Eeva |
title |
Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics |
title_short |
Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics |
title_full |
Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics |
title_fullStr |
Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics |
title_full_unstemmed |
Ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics |
title_sort |
ice formation, growth and associated substrate supply determine sea-ice bacterial community dynamics |
publisher |
Helsingin yliopisto |
publishDate |
2015 |
url |
http://hdl.handle.net/10138/154541 |
geographic |
Arctic Okhotsk |
geographic_facet |
Arctic Okhotsk |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
URN:ISBN:978-952-67851-7-2 Helsinki: Unigrafia, 2015, W. and A. de Nottbeck Foundation Sci Rep . 0358-6758 http://hdl.handle.net/10138/154541 URN:ISBN:978-952-67851-8-9 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774715313444618240 |