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Picoplanktonic prasinophytes are well represented in culture collections and marine samples. In order to better characterize this ecologically important group, we compared the phylogenetic diversity of picoplanktonic prasinophyte strains available at the Roscoff Culture Collection (RCC) and that of nuclear SSU rDNA sequences from environmental clone libraries obtained from oceanic and coastal ecosystems...
The objectives of this study were 1) to study the genetic diversity of the Alexandrium, Dinophysis and Karenia genera along the French coasts in order to design probes targeting specific DNA regions, and 2) to apply PCR-based detection to detect these three toxic dinoflagellate genera in natural samples. Genetic diversity of these toxic taxa was first studied from either cultures or cells isolated...
Two new oceanic free-living heterotrophic Heterokonta species with picoplanktonic size (< 2 μm) are described. Symbiomonas scintillans Guillou et Chretiennot-Oinet gen. et sp. nov. was isolated from samples collected both in the equatorial Pacific Ocean and the Mediterranean Sea. This new species possesses ultrastructural features of the bicosoecids, such as the absence of a helix in the flagellar...
La quasi-totalite de la production de biomasse des oceans provient de minuscules organismes photosynthetiques, d'un diametre parfois inferieur au micron. Encore inconnu il y a vingt ans, le picophytoplancton etonne les chercheurs par la richesse de ses formes.
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