Sökning: WFRF:(Wikner Johan 1961 ) > (2000-2004) > Salinity as a struc...
Fältnamn | Indikatorer | Metadata |
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000 | 03586naa a2200385 4500 | |
001 | oai:DiVA.org:umu-52544 | |
003 | SwePub | |
008 | 120224s2003 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-525442 URI |
024 | 7 | a https://doi.org/10.1016/S0168-6496(03)00149-12 DOI |
040 | a (SwePub)umu | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Langenheder, Silke4 aut |
245 | 1 0 | a Salinity as a structuring factor for the composition and performance of bacterioplankton degrading riverine DOC |
264 | 1 | c 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 | 7 | a NATURVETENSKAPx Biologix Mikrobiologi0 (SwePub)106062 hsv//swe |
650 | 7 | a 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 | |
700 | 1 | a Kisand, Veljo4 aut |
700 | 1 | a Wikner, Johan,d 1961-u Umeå universitet,Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet),Johan Wikner4 aut0 (Swepub:umu)jowi0002 |
700 | 1 | a Tranvik, Lars J4 aut |
710 | 2 | a Umeå universitetb Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet)4 org |
773 | 0 | t FEMS Microbiology Ecologyg 45:2, s. 189-202q 45:2<189-202x 0168-6496x 1574-6941 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-52544 |
856 | 4 8 | u https://doi.org/10.1016/S0168-6496(03)00149-1 |
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