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Bacterial community composition associated with freshwater algae: species specificity versus dependency on environmental conditions and source community.
MedLine Citation:
PMID:  23030046     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We studied bacterial associations with the green alga Desmodesmus armatus and the diatom Stephanodiscus minutulus under changing environmental conditions and bacterial source communities, to evaluate whether bacteria-algae associations are species-specific or more generalized, and determined by external factors. Axenic and xenic algae were incubated in situ with and without allelopathically-active macrophytes, and in the laboratory with sterile and non-sterile lake water and an allelochemical, tannic acid (TA). Bacterial community composition (BCC) of algae-associated bacteria was analysed by denaturing gradient gel electrophoresis (DGGE), nonmetric multidimensional scaling (NMDS), cluster analyses, and sequencing of DGGE bands. BCC of xenic algal cultures of both species were not significantly affected by changes in their environment or bacterial source community, except in the case of TA additions. Species-specific interactions therefore appear to overrule the effects of environmental conditions and source communities. The BCC of xenic and axenic D. armatus cultures subjected to in situ bacterial colonization, however, had lower similarities (ca. 55%), indicating that bacterial pre-colonization is a strong factor for bacteria-algae associations irrespective of environmental conditions and source community. Our findings emphasize the ecological importance of species-specific bacteria-algae associations with important repercussions for other processes, such as the remineralisation of nutrients, and organic matter dynamics. © 2012 Federation of European Microbiological Societies. Published by Blackwell PublishingLtd. All rights reserved.
Authors:
Falk Eigemann; Sabine Hilt; Ivette Salka; Hans-Peter Grossart
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-3
Journal Detail:
Title:  FEMS microbiology ecology     Volume:  -     ISSN:  1574-6941     ISO Abbreviation:  FEMS Microbiol. Ecol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8901229     Medline TA:  FEMS Microbiol Ecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.
Affiliation:
Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Berlin, Germany.
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