| Protozoan grazing and its impact upon population dynamics in biofilm communities. | |
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MedLine Citation:
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PMID: 15610437 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIMS: To determine the impact of protozoan grazing on the population dynamics of a multispecies bacterial biofilm community. METHODS AND RESULTS: Grazing by Acanthamoeba castellanii and the ciliate Colpoda maupasi upon biofilm and planktonic communities, composed of Klebsiella pneumoniae, Pseudomonas fluorescens and Staphylococcus epidermidis was investigated. Biofilms were formed using glass coverslips, held in a carousel device, as substrata for biofilm formation or in glass flow cells. The predatory effects of the amoeba were generally confined to the biofilm, where grazing rates corresponded to losses from the biofilm equivalent to ca 30,000 biofilm cells cm(-2) h(-1), with the amoeba becoming an integral part of the community. C. maupasi reduced the thickness of mature multispecies biofilms at steady-state from 500 to <200 microm. CONCLUSIONS: We report that the presence of the protozoa A. castellanii and C. maupasi markedly influence population dynamics within defined biofilm communities. SIGNIFICANCE AND IMPACT OF THE STUDY: The current study dispels the popular opinion that biofilms are protected against predation by protozoa. A. castellanii clearly has the capacity to graze mixed biofilm communities and to become integrally associated with them, whereas the ciliate C. maupasi reduced biofilm thickness by up to 60%. |
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Authors:
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S A Huws; A J McBain; P Gilbert |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of applied microbiology Volume: 98 ISSN: 1364-5072 ISO Abbreviation: J. Appl. Microbiol. Publication Date: 2005 |
Date Detail:
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Created Date: 2004-12-21 Completed Date: 2005-07-12 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 9706280 Medline TA: J Appl Microbiol Country: England |
Other Details:
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Languages: eng Pagination: 238-44 Citation Subset: IM |
Affiliation:
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School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acanthamoeba
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physiology Animals Bacteria* Biofilms* Ciliophora / physiology Colony Count, Microbial Eukaryota / physiology* Plankton Population Dynamics Predatory Behavior |
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