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Microbial communities and processes in ice-covered Arctic waters of the northwestern Fram Strait (75 to 80° N) during the vernal pre-bloom phase

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dc.contributor.author Seuthe, Lena
dc.contributor.author Töpper, Birte
dc.contributor.author Reigstad, Marit
dc.contributor.author Thyrhaug, Runar
dc.contributor.author Vaquer-Sunyer, Raquel
dc.date.accessioned 2012-08-09T07:48:00Z
dc.date.issued 2011-09-20
dc.identifier.citation Aquatic Microbial Ecology 64(3): 253-266
dc.identifier.issn 0948-3055
dc.identifier.uri http://dx.doi.org/10.3354/ame01525
dc.identifier.uri http://hdl.handle.net/1956/5931
dc.description.abstract Marine microbial communities have been little studied in Arctic waters, especially during the winter–spring transition before the development of extensive phytoplankton blooms. This study investigated microbial plankton in the ice-covered polar surface waters of the northwestern Fram Strait (75 to 80°N) at the onset of the 24 h light period in spring (April to May). The system we encountered was characterised by low concentrations of chlorophyll a (<0.2 μg l−1) and a low abundance of both bacteria (1.4 to 2.5 × 108 cells l−1) and protists (1 to 1.7 × 105 cells l−1). Bacterial production was very low (≤0.63 μg C l−1 d−1), despite the dominance of nucleic-acid-rich bacteria (58 ± 6% of total bacterial abundance). Small (2 to 5 μm) phototrophs dominated the eukaryotic assemblage in the surface and most probably had profound effects on the composition and metabolic balance of the microbial community as a whole. Most stations appeared to have been net-autotrophic, and calculations of phagotrophy indicated a balanced carbon budget for the microbial community. Mixotrophy was seen in a large part of the ciliate assemblage and may have contributed to the productivity and stability of the pre-bloom system that we encountered. en
dc.language.iso eng en
dc.publisher Inter-Research en
dc.relation.ispartof <a href="http://hdl.handle.net/1956/5929" target="blank">Bacterial community structures in the Arctic Ocean: the effect of increased carbon load on nutrient competition and bacterial diversity</a> en
dc.rights Copyright Inter-Research. All rights reserved. en
dc.subject Flow cytometry en
dc.subject Bacteria en
dc.subject Microzooplankton en
dc.subject Mixotrophy en
dc.subject Planktonic metabolism en
dc.title Microbial communities and processes in ice-covered Arctic waters of the northwestern Fram Strait (75 to 80° N) during the vernal pre-bloom phase en
dc.type Peer reviewed en
dc.type Journal article en
dc.subject.nsi VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 en
dc.embargo.liftdate 2014-09-20
dc.type.version publishedVersion en
dc.embargo.terms 2014-09-20 en


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