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Title

Eukaryotic picoplankton communities of the Mediterranean Sea in summer assessed by molecular approaches (DGGE, TTGE, QPCR)

AuthorsMarie, Dominique; Zhu, Fei; Balagué, Vanessa ; Ras, Joséphine; Vaulot, Daniel
KeywordsPelagic ecosystems
Flow cytometry
18S rRNA
Prasinophytes
Alveolates
Stramenopiles
Issue DateMar-2006
PublisherBlackwell Publishing
Federation of European Microbiological Societies
CitationFEMS Microbiology Ecology 55(3): 403-415 (2006)
AbstractThe composition and abundance of eukaryotic picoplankton (defined here as cells smaller than 3 mum) was investigated in the Morocco upwelling and throughout the Mediterranean Sea in late summer using flow cytometry and molecular methods (gradient gel electrophoresis and quantitative PCR). The picoplankton displayed characteristics typical of oligotrophic oceanic areas with concentrations down to 1000 cells mL(-1) in the Eastern Basin. The most abundant eukaryotic sequences recovered by gradient gel electrophoresis were related to uncultivated marine groups: alveolates I (16%) and II (26%) and a newly discovered group (env Nansha, 17%) for which sequences have been recently obtained from the South China Sea and that could be related to Acantharians. Prasinophyceae (photosynthetic green algae) accounted for 10% of the sequences, whereas Cercozoa, Stramenopiles, Polycystinea, dinoflagellates and ciliates provided minor contributions. The use of quantitative PCR coupled with taxon-specific primers allowed us to estimate the relative abundance of several taxa belonging to the Prasinophyceae. Of the three genera assessed, Bathycoccus appeared as the most abundant, forming localized maxima at depth
Description13 pages, 5 figures, 4 tables
Publisher version (URL)http://dx.doi.org/10.1111/j.1574-6941.2005.00058.x
URIhttp://hdl.handle.net/10261/27005
DOI10.1111/j.1574-6941.2005.00058.x
ISSN0168-6496
E-ISSN1574-6941
Appears in Collections:(ICM) Artículos
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