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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bacteria-algae association in batch cultures of phytoplankton from a tropical reservoir: the significance of algal carbohydrates

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Author(s):
Giroldo, Danilo [1] ; Ortolano, Pedro I. C. [2] ; Vieira, Armando A. H. [3]
Total Authors: 3
Affiliation:
[1] Universidade Federal de São Carlos (UFSCAR). Centro de Ciências Biológicas e da Saúde - Brasil
[2] Universidade Federal de São Carlos (UFSCAR). Centro de Ciências Biológicas e da Saúde. - Brasil
[3] Universidade Federal de São Carlos (UFSCAR). Centro de Ciências Biológicas e da Saúde. - Brasil
Total Affiliations: 3
Document type: Journal article
Source: Freshwater Biology; v. 52, n. 7, p. 1281-1289, 2007.
Field of knowledge: Biological Sciences - Microbiology
Abstract

The dissolved organic matter, especially carbohydrates, released by phytoplanktonic organisms may be ecologically important, through its influence on carbon cycling and microbial diversity. Here axenic cultures of three phytoplanktonic species, Cryptomonas tetrapyrenoidosa (Cryptophyceae), Staurastrum orbiculare (Zygnematophyceae) and Thalassiosira duostra (Bacillariophyceae), were inoculated with a microbial community from the same habitat in which the algae had been isolated (a tropical reservoir). Replicate cultures were not inoculated. 2. In both axenic and co-inoculated cultures, phytoplanktonic density and extracellular carbohydrate production were monitored microscopically and by high performance liquid chromatography with a pulse amperometric detector, respectively. Bacterial population density was also monitored by epifluorescence microscope in the microbial co-inoculated cultures. 3. Both bacterial and phytoplanktonic densities increased for 11 days in all cases. The use of extracellular carbohydrates by bacteria was also showed for all phytoplanktonic species. Of the three species of phytoplankton, only T. duostra had a faster population growth in the presence of bacteria, and reached a higher biomass than in axenic culture. (AU)

FAPESP's process: 99/07766-0 - The production and fate of algal extracellular polysaccharides in an eutrophic reservoir of the Tietê River, SP, Brazil
Grantee:Armando Augusto Henriques Vieira
Support Opportunities: Research Projects - Thematic Grants