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| Titel |
Protist community composition during early phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) |
| VerfasserIn |
C. Georges, S. Monchy, S. Genitsaris, U. Christaki |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 20 ; Nr. 11, no. 20 (2014-10-21), S.5847-5863 |
| Datensatznummer |
250117652
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| Publikation (Nr.) |
 copernicus.org/bg-11-5847-2014.pdf |
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| Zusammenfassung |
| Microbial eukaryotic community composition was examined by 18S rRNA gene tag
pyrosequencing, during the early phase of spring phytoplankton blooms induced
by natural iron fertilization, off Kerguelen Island in the Southern Ocean
(KEOPS2 cruise). A total of 999 operational taxonomical units (OTUs),
affiliated to 30 known high-level taxonomic groups, were retrieved from 16
samples collected in the upper 300 m water column. The alveolata group was
the most abundant in terms of sequence number and diversity (696 OTUs). The
majority of alveolata sequences were affiliated to Dinophyceae and to two
major groups of marine alveolates (MALV-I and MALV-II). In the upper 180 m,
only 13% of the OTUs were shared between of the fertilized stations and
the reference site characterized by high-nutrient low-chlorophyll (HNLC)
waters. Fungi and Cercozoa were present in iron-fertilized waters, but almost
absent in the HNLC samples, while Haptophyta and Chlorophyta characterized
the HNLC sample. Finally, the 300 m depth samples of all stations were
differentiated by the presence of MALV-II and Radiolaria. Multivariate
analysis, examining the level of similarity between different samples, showed
that protistan assemblages differed significantly between the HNLC and
iron-fertilized stations, but also between the diverse iron-fertilized
blooms. |
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