English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/173732
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Bacterioplankton community structure: Protists control net production and the proportion of active bacteria in a coastal marine community

AuthorsDel Giorgio, Paul A.; Gasol, Josep M. ; Vaqué, Dolors ; Mura, Maria Paola ; Agustí, Susana ; Duarte, Carlos M.
Issue DateSep-1996
PublisherAmerican Society of Limnology and Oceanography
CitationLimnology and Oceanography 41(6): 1169-1179 (1996)
AbstractA series of dialysis experiments was performed to study the relative importance of substrate limitation and grazing in controlling the proportion of active cells of coastal marine bacterioplankton. The grazer community was manipulated by filling dialysis bags with unfiltered water and water serially passed through 150-, 40-, and 0.8-μm pore-size filters. The total number of bacteria, the number of metabolically active cells, bacterial loss rates, and the abundances of heterotrophic nanoflagellates were measured immediately and at 3 and 6 d. Gross growth rates were similar in all treatments, suggesting that ambient nutrient concentrations set an upper limit to the maximum growth rates, whereas grazing determined the net growth rates and the final number of bacteria. Bacterial loss rates, measured as the disappearance of fluorescently labeled minicells, correlated well with the initial density of heterotrophic nanoflagellates in the different treatments. The number of active cells at the end of the experiments varied widely among treatments and reached 2.0 x 106 ml-1, or over 55% of the total final density in dialysis bags, with little or no grazing by nanoflagellates. The final proportion of active cells was negatively correlated to both the loss rates and the initial nanoflagellate density, and it was estimated that grazing rates on metabolically active bacteria were four or more times higher than those on inactive bacteria. Heterotrophic nanoflagellates thus seemed to control bacterial density by skimming newly growing cells rather than by cropping the standing stock of bacteria
Description11 pages, 7 figures, 2 tables
Publisher version (URL)https://doi.org/10.4319/lo.1996.41.6.1169
URIhttp://hdl.handle.net/10261/173732
Identifiersdoi: 10.4319/lo.1996.41.6.1169
issn: 0024-3590
Appears in Collections:(CEAB) Artículos
(ICM) Artículos
Files in This Item:
File Description SizeFormat 
Del_Giorgio_et_al_1996.pdf1,49 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.