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| Molecular and pigment studies of the picophytoplankton in a region of the Southern Ocean (42-54°S, 141-144°E) in March 1998 Wilmotte, A.; Demonceau, C.; Goffart, A.; Hecq, J.H.; Demoulin, V.; Crossley, A.C. (2002). Molecular and pigment studies of the picophytoplankton in a region of the Southern Ocean (42-54°S, 141-144°E) in March 1998. Deep-Sea Res., Part II, Top. Stud. Oceanogr. 49(16): 3351-3363. dx.doi.org/10.1016/S0967-0645(02)00087-5
In: Deep-Sea Research, Part II. Topical Studies in Oceanography. Pergamon: Oxford. ISSN 0967-0645; e-ISSN 1879-0100
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HPLC analysis of total chlorophylls and carotenoids showed fairly low phytoplankton concentrations (77-262 ng chl al-1), with minimal values of the pigments in the two samples of the Polar Front Zone around 54°S (water temperature of 4°C at time of collection). In this zone, a similar decrease of particles, identified as cyanobacteria on the basis of their fluorescence, was observed by flow cytometry. Sequences very similar to the 16S rDNA sequence of Synechococcus WH8103 were present in all samples. This Synechococcus genotype is thus found in the Southern Ocean in addition to the Atlantic and Pacific locations where it has been previously observed. The yield of PCR products was lower in the two samples taken in the Polar Front Zone, showing a good agreement between molecular and pigment data. 16S rDNA sequences of plastids of eukaryotic algae also were retrieved, mostly related to those of an environmental clone called OM164, which has not been cultivated but has phylogenetic affinities to the Raphidophyceae. |
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