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dc.contributor.authorAssmy, Philipp
dc.contributor.authorKvernvik, Ane Cecilie
dc.contributor.authorHop, Haakon
dc.contributor.authorHoppe, Clara J.M.
dc.contributor.authorChierici, Melissa
dc.contributor.authorDavid T., Divya
dc.contributor.authorDuarte, Pedro
dc.contributor.authorFransson, Agneta
dc.contributor.authorGarcía, Laura M.
dc.contributor.authorPatuła, Weronika
dc.contributor.authorKwaśniewski, Sławomir
dc.contributor.authorMaturilli, Marion
dc.contributor.authorPavlova, Olga
dc.contributor.authorTatarek, Agnieszka
dc.contributor.authorWiktor, Jozef M
dc.contributor.authorWold, Anette
dc.contributor.authorWolf, Klara K.E.
dc.contributor.authorBailey, Allison Michelle
dc.date.accessioned2023-08-21T11:34:28Z
dc.date.available2023-08-21T11:34:28Z
dc.date.issued2023-02-24
dc.description.abstractSeasonal plankton time-series data are presented from Kongsfjorden from two years with contrasting environmental conditions. Kongsfjorden (west coast of Spitsbergen – 79°N) integrates inputs from Atlantic and Arctic waters, and glacier run-off, and is thus a prime location to study impacts on ecosystem dynamics of key environmental drivers that are relevant across the Arctic. Despite extensive research in Kongsfjorden, seasonally-resolved data are scarce. From late April/early May to early September 2019 and 2020, we conducted pelagic sampling at a mid-fjord station at mostly weekly to bi-weekly resolution investigating the environmental drivers of phyto- and zooplankton community composition and phenology. During spring 2019, Atlantic water masses with temperatures > 1 °C were found throughout the upper 250 m of the water column, and little sea ice occurred in the fjord. Spring 2020, in turn, was characterized by the presence of local water masses with sub-zero temperatures and relatively extensive sea-ice cover. The most striking contrast between the two years was the difference in phytoplankton spring bloom composition. In 2019, the spring bloom was dominated by the colonial stage of the haptophyte Phaeocystis pouchetii and diatoms played a minor role, while the spring bloom in 2020 was dominated by diatoms of the genus Thalassiosira succeeded by P. pouchetii. Selective grazing by large copepods and water mass structure seem to have been the decisive factors explaining the marked difference in diatom spring bloom biomass between the years while similar spring abundances of P. pouchetii in both years indicated that this species was less impacted by those factors. Our data suggest that differences in spring bloom composition impacted trophic transfer and carbon export. Recruitment of the dominant copepods Calanus finmarchicus and C. glacialis, Cirripedia and euphausiid larvae as well as the export of carbon to the seabed was more efficient during the diatom-dominated compared to the P. pouchetii–dominated spring bloom. In summer, the plankton composition shifted towards a flagellate-dominated community characterized by mixo- and heterotrophic taxa adapted to a lower nutrient regime and strong top-down control by copepod grazers. However, residual silicic acid after the P. pouchetii–dominated spring bloom fueled a late summer diatom bloom in 2019. Our data provide a first glimpse into the environmental drivers of plankton phenology and underline that high-resolution monitoring over many annual cycles is required to resolve the ephemeral variations of plankton populations against the backdrop of climate change.en_US
dc.identifier.citationAssmy, Kvernvik, Hop, Hoppe, Chierici, David T., Duarte, Fransson, García, Patuła, Kwaśniewski, Maturilli, Pavlova, Tatarek, Wiktor, Wold, Wolf, Bailey. Seasonal plankton dynamics in Kongsfjorden during two years of contrasting environmental conditions. Progress in Oceanography. 2023;213en_US
dc.identifier.cristinIDFRIDAID 2140473
dc.identifier.doi10.1016/j.pocean.2023.102996
dc.identifier.issn0079-6611
dc.identifier.issn1873-4472
dc.identifier.urihttps://hdl.handle.net/10037/30125
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalProgress in Oceanography
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleSeasonal plankton dynamics in Kongsfjorden during two years of contrasting environmental conditionsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)