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Bacterial communities shaping the redox environment in top-layer sediments of an oligotrophic high latitude lake
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi. Uppsala universitet, Science for Life Laboratory, SciLifeLab.ORCID-id: 0000-0002-4265-1835
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Emneord [en]
Electromicrobiology, Bacteria, Microsensors, Redox potential, Lake Sediments
HSV kategori
Forskningsprogram
Biologi med inriktning mot limnologi
Identifikatorer
URN: urn:nbn:se:uu:diva-263205OAI: oai:DiVA.org:uu-263205DiVA, id: diva2:857281
Tilgjengelig fra: 2015-09-28 Laget: 2015-09-28 Sist oppdatert: 2017-01-25bibliografisk kontrollert
Inngår i avhandling
1. Microbial adaptations and controlling mechanisms of surface-associated microhabitat heterogeneity in aquatic systems
Åpne denne publikasjonen i ny fane eller vindu >>Microbial adaptations and controlling mechanisms of surface-associated microhabitat heterogeneity in aquatic systems
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Habitat heterogeneity is a driving factor for speciation and ecosystem functioning and is well studied in macro-ecology. Yet our understanding of microbial adaptations, and governing processes is incomplete. The here presented thesis aims at giving us a better understanding of patterns in micro-heterogeneity, and microbial adaptations to such heterogeneity with particular focus on surface-dominated, aquatic habitats. The most prominent microbial adaptation to surface associated mode of life is biofilm formation. Biofilms rely heavily on type IV pili. These pili systems are well studied in Bacteria, but largely unknown in Archaea. Therefore, the first part of this thesis focuses on resolving genetic and structural feature of the type IV like aap-pilus of the thermo-acidophilic Sulfolobus acidocaldarius. We found the aap-pilus to be indispensible for biofilm formation, and to be unparalleled in variability of its quaternary structure and cross regulation with other filaments. The second part of this thesis investigates particle colonization in the water column, focusing on diatoms as a model system, allowing an in situ assessment of different stages of particle colonization, and potential particle-specificity of the associated bacterial community. Opposing reports from marine systems, we did not observe diatom-specificity in the associated bacterial community. Instead we found bacterial community subsets, one likely originating from sediment resuspension, and the other being controlled by biofilm-forming populations (e.g. Flexibacter), able to attach to newly formed particle surfaces and subsequently facilitate secondary colonization by other bacteria. Finally, the habitat heterogeneity in top-layers of lake sediments were investigated in experimental microcosms. Cell-specific oxygen consumption rates were determined, to assess microbial activity across different scales. Individual activity rates differed strongly across all investigated scales, likely due to spatially heterogeneous distribution of nutrients with differing quality. Vice versa, the influence of microbial activity on micro-habitat-heterogeneity was investigated. We correlated sediment redox-state with bacterial community composition and populations. Our results indicate that habitat heterogeneity is generally beneficial for microorganism, and greater heterogeneity results in greater bacterial diversity. However, this heterogeneity-diversity relationship is limited and microorganisms actively stabilize their immediate redox environment to a preferred, community-specific, stable state, if cell abundances exceed a minimum threshold.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2015. s. 69
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1296
Emneord
microbial habitat heterogeneity
HSV kategori
Forskningsprogram
Biologi med inriktning mot limnologi
Identifikatorer
urn:nbn:se:uu:diva-263206 (URN)978-91-554-9351-6 (ISBN)
Disputas
2015-11-20, Ekman Salen, Norbyvägen 14, Uppsala, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2015-10-27 Laget: 2015-09-28 Sist oppdatert: 2015-11-10

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