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dc.contributor.authorSeuthe, Lena
dc.contributor.authorIversen, Kriss Wenche Rokkan
dc.contributor.authorexternalNarcy, Fannyen
dc.date.accessioned2012-01-10T08:37:52Z
dc.date.available2012-01-10T08:37:52Z
dc.date.issued2011
dc.description.abstractThe composition and ecological role of ciliates and dinoflagellates were investigated at one station in Kongsfjorden, Svalbard, during six consecutive field campaigns between March and December 2006. Total ciliate and dinoflagellate abundance mirrored the seasonal progression of phytoplankton, peaking with 5.8 9 104 cells l-1 in April at an average chlorophyll a concentration of 10 lg l-1. Dinoflagellates were more abundant than ciliates, dominated by small athecates. Among ciliates, aloricate oligotrichs dominated the assemblage. A large fraction ([60%) of ciliates and dinoflagellates contained chloroplasts in spring and summer. The biomass of the purely heterotrophic fraction of the ciliate and dinoflagellate community (protozooplankton) was with 14 lg C l-1 highest in conjunction with the phytoplankton spring bloom in April. Growth experiments revealed similar specific growth rates for heterotrophic ciliates and dinoflagellates (\0–0.8 d-1). Food availability may have controlled the protozooplankton assemblage in winter, while copepods may have exerted a strong control during the post-bloom period. Calculations of the potential grazing rates of the protozooplankton indicated its ability to control or heavily impact the phytoplankton stocks at most times. The results show that ciliates and dinoflagellates were an important component of the pelagic food web in Kongsfjorden and need to be taken into account when discussing the fate of phytoplankton and biogeochemical cycling in Arctic marine ecosystems.en
dc.descriptionThis paper is part of Lena Seuthe's doctoral thesis, which is available in Munin at <a href=http://hdl.handle.net/10037/3777>http://hdl.handle.net/10037/3777</a>en
dc.identifier.citationPolar Biology 34(2011) nr. 5 s. 751-766en
dc.identifier.cristinIDFRIDAID 837211
dc.identifier.doidoi: 10.1007/s00300-010-0930-9
dc.identifier.issn0722-4060
dc.identifier.urihttps://hdl.handle.net/10037/3778
dc.identifier.urnURN:NBN:no-uit_munin_3489
dc.language.isoengen
dc.publisherSpringer Verlagen
dc.rights.accessRightsopenAccess
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en
dc.subjectMicrozooplanktonen
dc.subjectMesozooplanktonen
dc.subjectPhytoplanktonen
dc.subjectFood weben
dc.subjectCarbon cyclingen
dc.subjectArcticen
dc.titleMicrobial processes in a high-latitude fjord (Kongsfjorden, Svalbard) : II. Ciliates and dinoflagellatesen
dc.typeJournal articleen
dc.typeTidsskriftartikkelen
dc.typePeer revieweden


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