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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 eng
dc.contributor.author Töpper, Birte eng
dc.contributor.author Reigstad, Marit eng
dc.contributor.author Thyrhaug, Runar eng
dc.contributor.author Vaquer-Sunyer, Raquel eng
dc.date.accessioned 2012-08-09T07:48:00Z
dc.date.issued 2011-09-20 eng
dc.identifier.citation Aquatic Microbial Ecology 64(3): 253-266
dc.identifier.issn 0948-3055 eng
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 eng
dc.publisher Inter-Research eng
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> eng
dc.subject Flow cytometry eng
dc.subject Bacteria eng
dc.subject Microzooplankton eng
dc.subject Mixotrophy eng
dc.subject Planktonic metabolism eng
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 eng
dc.type Peer reviewed eng
dc.type Journal article eng
dc.subject.nsi VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 eng
dc.rights.holder Copyright Inter-Research. All rights reserved.
dc.embargo.liftdate 2014-09-20
dc.type.version publishedVersion eng
dc.embargo.terms 2014-09-20 eng
bora.peerreviewed Peer reviewed eng
bibo.doi http://dx.doi.org/10.3354/ame01525 eng
dc.identifier.doi http://dx.doi.org/10.3354/ame01525
dcterms.isPartOf http://hdl.handle.net/1956/5929


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