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Environmental influences on Vibrio populations in northern temperate and boreal coastal waters (Baltic and Skagerrak Seas)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology. (Mikrobiell Ekologi)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology. (Mikrobiell Ekologi)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology. (Mikrobiell Ekologi)
2006 (English)In: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 72, no 9, 6004-6011 p.Article in journal (Refereed) Published
Abstract [en]

Even if many Vibrio spp. are endemic to coastal waters, their distribution in northern temperate and boreal waters is poorly studied. To identify environmental factors regulating Vibrio populations in a salinity gradient along the Swedish coastline, we combined Vibrio-specific quantitative competitive PCR with denaturant gradient gel electrophoresis-based genotyping. The total Vibrio abundance ranged from 4 X 10(3) to 9.6 X 10(4) cells liter(-1), with the highest abundances in the more saline waters of the Skagerrak Sea. Several Vibrio populations were present throughout the salinity gradient, with abundances of single populations ranging from 5 X 10(4) to 7 X 10(4) cells liter(-1). Clear differences were observed along the salinity gradient, where three populations dominated the more saline waters of the Skagerrak Sea and two populations containing mainly representatives of V anguillarum and V. aestuarianus genotypes were abundant in the brackish waters of the Baltic Sea. Our results suggest that this apparent niche separation within the genus Vibrio may also be influenced by alternate factors such as nutrient levels and high abundances of dinoflagellates. A V. choleraelV. mimicus population was detected in more than 50% of the samples, with abundances exceeding 10(3) cells liter(-1), even in the cold (annual average water temperature of around 5 degrees C) and low-salinity (2 to 4 parts per thousand) samples from the Bothnian Bay (latitude, 65 degrees N). The unsuspected and widespread occurrence of this population in temperate and boreal coastal waters suggests that potential Vibrio pathogens may also be endemic to cold and brackish waters and hence may represent a previously overlooked health hazard.

Place, publisher, year, edition, pages
2006. Vol. 72, no 9, 6004-6011 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-95276DOI: 10.1128/AEM.00917-06ISI: 000240474000041PubMedID: 16957222OAI: oai:DiVA.org:uu-95276DiVA: diva2:169433
Available from: 2006-12-20 Created: 2006-12-20 Last updated: 2017-12-14Bibliographically approved
In thesis
1. The Niches of Bacterial Populations in Productive Waters: Examples from Coastal Waters and Four Eutrophic Lakes
Open this publication in new window or tab >>The Niches of Bacterial Populations in Productive Waters: Examples from Coastal Waters and Four Eutrophic Lakes
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 68 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 254
Keyword
Ecology, diversity, 16S rRNA, phytoplankton, bloom, pathogen, carbon cycle, Ekologi
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-7419 (URN)91-554-6760-1 (ISBN)
Public defence
2007-01-19, Ekmansalen, EBC (Evolutionary Biology Center), Uppsala, 10:00
Opponent
Supervisors
Available from: 2006-12-20 Created: 2006-12-20 Last updated: 2016-04-28Bibliographically approved

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Eiler, AlexanderBertilsson, Stefan

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