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  • Artikel  (4)
  • WILEY-BLACKWELL PUBLISHING  (3)
  • SPRINGER  (1)
  • Association for the Sciences of Limnology and Oceanography
  • ELSEVIER SCIENCE BV
  • 2010-2014  (4)
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  • Artikel  (4)
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  • 1
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    Protist distribution in the Western Fram Strait in summer 2010 based on 454-pyrosequencing of the 18S rDNA (2013)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3Journal of Phycology, WILEY-BLACKWELL PUBLISHING, 49(5), pp. 996-1010, ISSN: 0022-3646
    Details
    Publikationsdatum: 2019-07-16
    Beschreibung: In this study we present the first comprehensive analyses of the diversity and distribution of marine protist (micro- nano- and picoeukaryotes) in the Western Fram Strait, using 454-pyrosequencing and high-pressure liquid chromatography (HPLC) at five stations in summer 2010. Three stations (T1; T5; T7) were influenced by Polar Water, characterized by cold water with lower salinity (〈33) and different extents of ice-concentrations. Atlantic Water influenced the other two stations (T6; T9). While T6 was located in the mixed water zone characterized by cold water with intermediate salinity (~33) and high ice-concentrations, T9 was located in warm water with high salinity (~35) and no ice-coverage at all. General trends in community structure according to prevailing environmental settings, observed with both methods, coincided well. At two stations, T1 and T7, characterized by lower ice concentrations, diatoms (Fragilariopsis sp., Porosira sp., Thalassiosira spp.) dominated the protist community. The third station (T5) was ice-covered, but has been ice-free for ~4 weeks prior to sampling. At this station, dinoflagellates (Dinophyceae 1, Woloszynskia sp. and Gyrodinium sp.) were dominant, reflecting a post-bloom situation. At station T6 and T9, the protist communities consisted mainly of picoeukaryotes, e.g. Micromonas spp. Based on our results, 454-pyrosequencing has proven to be an adequate tool to provide comprehensive information on the composition of protist communities. Furthermore, this study suggests that a snap-shot of a few, but well-chosen samples can already provide an overview of community structure patterns and successions in a dynamic marine environment.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
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    ARTIKEL (OA)
  • 2
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    Insight into protist diversity in Arctic sea ice and melt-pond aggregate obtained by pyrosequencing (2014)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3Polar Research, WILEY-BLACKWELL PUBLISHING, 33, ISSN: 0800-0395
    Details
    Publikationsdatum: 2015-03-05
    Beschreibung: Protists in the central Arctic Ocean are adapted to the harsh environmental conditions of its various habitats. During the Polarstern cruise ARK-XXVI/3 in 2011, at one sea ice station, large aggregates accumulated at the bottom of the melt ponds. In this study, the protist assemblages of the bottom layer of the sea ice and melt pond aggregate were investigated using flow cytometry and 454-pyrosequencing. The objective is to provide a first molecular overview of protist diversity in these habitats and to consider the overlaps and/or differences in the community compositions. Results of flow cytometry pointed to a cell size distribution that was dominated by 3-10 µm nanoflagellates. The phylogenetic classification of all sequences was conducted at a high taxonomic level, while a selection of abundant (≥1% of total reads) sequences was further classified at a lower level. On the high taxonomic level, both habitats showed very similar community structures, dominated by chrysophytes and chlorophytes. On the lower taxonomic level, dissimilarities in the diversity of both groups were encountered in the abundant biosphere. While sea ice chlorophytes and chrysophytes were dominated by Chlamydomonas/Chloromonas spp and Ochromonas spp, the melt pond aggregate was dominated by Carteria sp., Ochromonas spp. and Dinobryon faculiferum. We suppose that the relatively high similarity in diversity is a consequence of melt pond freshwater seeping through porous sea ice in late summer. Differences in the abundant biosphere nevertheless indicate that differences in both habitats are also strong enough to select for different dominant species.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 3
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    Picoeukaryote Plankton Composition off West Spitsbergen at the Entrance to the Arctic Ocean (2014)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3Journal of Eukaryotic Microbiology, WILEY-BLACKWELL PUBLISHING, ISSN: 1066-5234
    Details
    Publikationsdatum: 2019-07-16
    Beschreibung: Investigation of marine eukaryotic picoplankton composition is limited by missing morphological features for appropriate identification. Consequently, molecular methods are required. In this study, we used 454-pyrosequencing to study picoplankton communities at four stations in the West Spitsbergen Current (WSC; Fram Strait). High abundances of Micromonas pusilla were detected in the station situated closest to Spitsbergen, as seen in surveys of picoplankton assemblages in the Beaufort Sea. At the other three stations, other phylotypes, affiliating with Phaeocystis pouchetii and Syndiniales in the phylogenetic tree, were present in high numbers, dominating most of them. The picoplankton community structures at three of the stations, all with similar salinity and temperature, were alike. At the fourth station, the influence of the East Spitsbergen Current (ESC), transporting cold water from the Barents Sea around Spitsbergen, causes different abiotic parameters that result in a significantly different picoeukaryote community composition, which is dominated by Micromonas pusilla. This observation is particularly interesting in regard to ongoing environmental changes in the Arctic. Ongoing warming of the WSC could convey a new picoplankton assemblage into the Arctic Ocean, which may come to affect the dominance of Micromonas pusilla.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
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    ARTIKEL (OA)
  • 4
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    Protist community composition in the Pacific sector of the Southern Ocean during austral summer 2010 (2014)
    SPRINGER
    In:  EPIC3Polar Biology, SPRINGER, 37(3), pp. 375-389, ISSN: 0722-4060
    Details
    Publikationsdatum: 2014-04-23
    Beschreibung: Knowledge about the protist diversity of the Pacific sector of the Southern Ocean is scarce. We tested the hypothesis that distinct protist community assemblages characterize large-scale water masses. Therefore, we determined the composition and biogeography of late summer protist assemblages along a transect from the coast of New Zealand to the eastern Ross Sea. We used state of the art molecular approaches, such as automated ribosomal intergenic spacer analysis and 454-pyrosequencing, combined with high-performance liquid chromatography pigment analysis to study the protist assemblage. We found distinct biogeographic patterns defined by the environmental conditions in the particular region. Different water masses harbored different microbial communities. In contrast to the Arctic Ocean, picoeukaryotes had minor importance throughout the investigated transect and showed very low contribution south of the Polar Front. Dinoflagellates, Syndiniales, and small stramenopiles were dominating the sequence assemblage in the Subantarctic Zone, whereas the relative abundance of diatoms increased southwards, in the Polar Frontal Zone and Antarctic Zone. South of the Polar Front, most sequences belonged to haptophytes. This study delivers a comprehensive and taxon detailed overview of the protist composition in the investigated area during the austral summer 2010.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
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