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Growth response of Vibrio cholerae and other Vibrio spp. to cyanobacterial dissolved organic matter and temperature in Brackish Water
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
2007 (engelsk)Inngår i: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 60, nr 3, s. 411-418Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Environmental control of growth and persistence of vibrios in aquatic environments is poorly understood even though members of the genus Vibrio are globally important pathogens. To study how algal-derived organic matter and temperature influenced the abundance of different Vibrio spp., Baltic Sea microcosms inoculated with Vibrio cholerae, Vibrio vulnificus, Vibrio parahaemolyticus, Vibrio alginolyticus and native bacterioplankton, were exposed to different temperatures (12–25°C) and amended with dissolved organic matter from Nodularia spumigena (0–4.2 mg C L−1). Vibrio abundance was monitored by culture-dependent and molecular methods. Results suggested that Vibrio populations entered a viable but nonculturable state during the incubations. Abundance of Vibrio spp. and total bacterioplankton were orders of magnitude higher in microcosms amended with organic matter compared with reference microcosms. Vibrio cholerae abundances ranged from 0.9 to 1.9 × 105 cells mL−1 in treatments amended with 4.2 mg C L−1. Vibrio cholerae abundance relative to total bacterioplankton and other Vibrio spp. also increased >10-fold. In addition, V. vulnificus abundance increased in mesocosms with the highest organic matter addition (0.9–1.8 × 104 cells mL−1). Temperature alone did not significantly affect abundances of total bacterioplankton, total Vibrio spp. or individual Vibrio populations. By contrast, cyanobacterial-derived organic matter represented an important factor regulating growth and abundance of V. cholerae and V. vulnificus in brackish waters.

sted, utgiver, år, opplag, sider
2007. Vol. 60, nr 3, s. 411-418
Emneord [en]
Vibrio cholerae, Vibrio spp., Cyanobacteria, DOM, brackish water, growth
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-95277DOI: 10.1111/j.1574-6941.2007.00303.xISI: 000246708800007PubMedID: 17386033OAI: oai:DiVA.org:uu-95277DiVA, id: diva2:169434
Tilgjengelig fra: 2006-12-20 Laget: 2006-12-20 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. The Niches of Bacterial Populations in Productive Waters: Examples from Coastal Waters and Four Eutrophic Lakes
Åpne denne publikasjonen i ny fane eller vindu >>The Niches of Bacterial Populations in Productive Waters: Examples from Coastal Waters and Four Eutrophic Lakes
2006 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
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
Emneord
Ecology, diversity, 16S rRNA, phytoplankton, bloom, pathogen, carbon cycle, Ekologi
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-7419 (URN)91-554-6760-1 (ISBN)
Disputas
2007-01-19, Ekmansalen, EBC (Evolutionary Biology Center), Uppsala, 10:00
Opponent
Veileder
Tilgjengelig fra: 2006-12-20 Laget: 2006-12-20 Sist oppdatert: 2016-04-28bibliografisk kontrollert

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