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Composition of freshwater bacterial communities associated with cyanobacterial blooms in four Swedish lakes.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för ekologi och evolution.
2004 Ingår i: Environmental Microbiology, Vol. 6, nr 12, s. 1228–1243-Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2004. Vol. 6, nr 12, s. 1228–1243-
Identifikatorer
URN: urn:nbn:se:uu:diva-95272OAI: oai:DiVA.org:uu-95272DiVA, id: diva2:169429
Tillgänglig från: 2006-12-20 Skapad: 2006-12-20Bibliografiskt granskad
Ingår i avhandling
1. The Niches of Bacterial Populations in Productive Waters: Examples from Coastal Waters and Four Eutrophic Lakes
Öppna denna publikation i ny flik eller fönster >>The Niches of Bacterial Populations in Productive Waters: Examples from Coastal Waters and Four Eutrophic Lakes
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Recent research in microbial ecology has focused on how aquatic bacterial communities are assembled. Only a few of these studies follow a “Gleasonian” approach where the roles of single bacterial populations are in focus. In this thesis, novel molecular tools were used to describe the distribution and evolutionary relationships of microbes in productive aquatic environments. Many new phylogenetic groups of bacteria were identified, likely representing bacterial populations restricted to productive freshwaters. I also addressed the dynamics and functional role of individual bacterial populations in eutrophic lakes and brackish environments with a focus on either biogeochemically significant or potentially pathogenic representatives. Flavobacteria blooms were observed, on occasions characterized by high heterotrophic production. In addition to high temporal dynamics microbial community composition and function differed on the spatial scale, as exemplified by free-living and Cyanobacteria-associated habitats. At the community scale, microbial processes, such as biomass production and substrate uptake could be predicted from the presence and absence of individual bacterial populations. I also studied the niches of potentially pathogenic Vibrio populations in various coastal waters. Using a novel culture-independent method, a V. cholerae population was detected along the entire Swedish coastline. Results from an environmental survey and a laboratory mesocosm experiment reveal that phytoplankton-derived dissolved organic matter enhance the growth of V. cholerae and other Vibrio spp. and hence create a largely overlooked niche for these heterotrophic bacteria. This thesis and future work on the role of individual bacterial populations will facilitate predictions of biogeochemical cycles and the distribution of bacteria in the context of global climate change and local eutrophication.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2006. s. 68
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 254
Nyckelord
Ecology, diversity, 16S rRNA, phytoplankton, bloom, pathogen, carbon cycle, Ekologi
Nationell ämneskategori
Ekologi
Identifikatorer
urn:nbn:se:uu:diva-7419 (URN)91-554-6760-1 (ISBN)
Disputation
2007-01-19, Ekmansalen, EBC (Evolutionary Biology Center), Uppsala, 10:00
Opponent
Handledare
Tillgänglig från: 2006-12-20 Skapad: 2006-12-20 Senast uppdaterad: 2016-04-28Bibliografiskt granskad

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