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Sökning: WFRF:(Wikner Johan 1961 ) > (2000-2004) > Salinity as a struc...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003586naa a2200385 4500
001oai:DiVA.org:umu-52544
003SwePub
008120224s2003 | |||||||||||000 ||eng|
024a https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-525442 URI
024a https://doi.org/10.1016/S0168-6496(03)00149-12 DOI
040 a (SwePub)umu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
100a Langenheder, Silke4 aut
2451 0a Salinity as a structuring factor for the composition and performance of bacterioplankton degrading riverine DOC
264 1c 2003
338 a print2 rdacarrier
520 a The impact of salinity on the composition and functional performance (biomass production, growth efficiency and growth rates) of bacterial communities was investigated using batch cultures growing on dissolved organic carbon from a river draining into the Northern Baltic Sea. The cultures were adjusted to riverine or estuarine salinity levels and inoculated with bacteria from these two environments. Bacterial growth efficiencies differed in response to salinity and the origin of the inoculum. When salinity was adjusted to correspond to the salinity at the site where the inoculum was retrieved, growth efficiency was relatively high (11.5 +/- 2.6%). However, when bacteria were confronted with a shift in salinity, growth efficiency was lower (7.5 +/- 2.0%) and more of the utilized carbon was respired. In contrast, growth rates were higher when bacteria were exposed to a change in salinity. The composition of the bacterial communities developing in the batch cultures differed, as shown by 16S rDNA DGGE, depending on the origin of the inoculum and salinity. Reverse and direct DNA-DNA hybridization revealed salinity optima in the growth of specific bacterial strains as well as broader phylogenetic groups. Strains belonging to the alpha- and beta-Proteobacteria, Actinobacteria and gamma-Proteobacteria other than the genus Pseudomonas showed higher relative abundance under freshwater conditions, whereas strains of the genus Pseudomonas and the Cytophaga-Flavobacterium-Bacteroides group were favored by estuarine conditions. Generally, our results demonstrate functional changes associated with changes in community composition. We suggest that even moderate changes in salinity affect bacterial community composition, which subsequently leads to altered growth characteristics. (C) 2003 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.
650 7a NATURVETENSKAPx Biologix Mikrobiologi0 (SwePub)106062 hsv//swe
650 7a NATURAL SCIENCESx Biological Sciencesx Microbiology0 (SwePub)106062 hsv//eng
653 a heterotrophic bacteria
653 a salinity
653 a dissolved organic carbon
653 a environmental disturbance
653 a denaturing gradient gel electrophoresis
653 a DNA-DNA hybridization
700a Kisand, Veljo4 aut
700a Wikner, Johan,d 1961-u Umeå universitet,Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet),Johan Wikner4 aut0 (Swepub:umu)jowi0002
700a Tranvik, Lars J4 aut
710a Umeå universitetb Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet)4 org
773t FEMS Microbiology Ecologyg 45:2, s. 189-202q 45:2<189-202x 0168-6496x 1574-6941
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-52544
8564 8u https://doi.org/10.1016/S0168-6496(03)00149-1

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