Show simple item record

dc.contributor.authorOlli, Kalle
dc.contributor.authorHalvorsen, Elisabeth
dc.contributor.authorVernet, Maria
dc.contributor.authorLavrentyev, Peter J.
dc.contributor.authorFranzè, Gayantonia
dc.contributor.authorSanz-Martín, Marina
dc.contributor.authorPaulsen, Maria Lund
dc.contributor.authorReigstad, Marit
dc.date.accessioned2019-10-17T08:44:56Z
dc.date.available2019-10-17T08:44:56Z
dc.date.issued2019-05-28
dc.description.abstractWe used inverse modeling to reconstruct major planktonic food web carbon flows in the Atlantic Water inflow, east and north of Svalbard during spring (18–25 May) and summer (9–13 August), 2014. The model was based on three intensively sampled stations during both periods, corresponding to early, peak, and decline phases of a <i>Phaeocystis</i> and diatom dominated bloom (May), and flagellates dominated post bloom stages (August). The food web carbon flows were driven by primary production (290–2,850 mg C m<sup>-2</sup> d<sup>-1</sup>), which was channeled through a network of planktonic compartments, and ultimately respired (180–1200 mg C m<sup>2</sup> d<sup>-1</sup>), settled out of the euphotic zone as organic particles (145–530 mg C m<sup>-2</sup> d<sup>-1</sup>), or accumulated in the water column in various organic pools. The accumulation of dissolved organic carbon was intense (1070 mg C m<sup>-2</sup> d<sup>-1</sup>) during the early bloom stage, slowed down during the bloom peak (400 mg C m<sup>-2</sup> d<sup>-1</sup>), and remained low during the rest of the season. The heterotrophic bacteria responded swiftly to the massive release of new DOC by high but decreasing carbon assimilation rates (from 534 to 330 mg C m<sup>-2</sup> d<sup>-1</sup>) in May. The net bacterial production was low during the early and peak bloom (26–31 mg C m<sup>-2</sup> d<sup>-1</sup>) but increased in the late and post bloom phases (>50 mg C m<sup>-2</sup> d<sup>-1</sup>). The heterotrophic nanoflagellates did not respond predictably to the different bloom phases, with relatively modest carbon uptake, 30–170 mg C m<sup>2</sup> d<sup>-1</sup>. In contrast, microzooplankton increased food intake from 160 to 380 mg C m<sup>2</sup> d<sup>-1</sup> during the buildup and decline phases, and highly variable carbon intake 46–624 mg C m<sup>2</sup> d<sup>-1</sup>, during post bloom phases. Mesozooplankton had an initially high but decreasing carbon uptake in May (220–48 mg C m<sup>-2</sup> d<sup>-1</sup>), followed by highly variable carbon consumption during the post bloom stages (40–190 mg C m<sup>-2</sup> d<sup>-1</sup>). Both, micro- and mesozooplankton shifted from almost pure herbivory (92–97% of total food intake) during the early bloom phase to an herbivorous, detritovorous and carnivorous mixed diet as the season progressed. Our results indicate a temporal decoupling between the microbial and zooplankton dominated heterotrophic carbon flows during the course of the bloom in a highly productive Atlantic gateway to the Arctic Ocean.en_US
dc.descriptionSource at <a href=https://doi.org/10.3389/fmars.2019.00244>https://doi.org/10.3389/fmars.2019.00244</a>.en_US
dc.identifier.citationOlli, K., Halvorsen, H., Vernet, M., Lavrentyev, P.J., Franzè, G., Sanz-Martín, M., ... Reigstad, M. (2019). Food web functions and interactions during spring and summer in the arctic water inflow region: Investigated through inverse modeling. <i>Frontiers in Marine Science, 6</i>, 244. https://doi.org/10.3389/fmars.2019.00244en_US
dc.identifier.cristinIDFRIDAID 1712948
dc.identifier.doi10.3389/fmars.2019.00244
dc.identifier.issn2296-7745
dc.identifier.urihttps://hdl.handle.net/10037/16428
dc.language.isoengen_US
dc.publisherFrontiers Mediaen_US
dc.relation.journalFrontiers in Marine Science
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/226415/Norway/Bridging marine productivity regimes: How Atlantic advection affects productivity, carbon cycling and export in a melting Arctic Ocean//en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.subjectcarbon flowen_US
dc.subjectfood weben_US
dc.subjectinverse methoden_US
dc.subjectArctic Oceanen_US
dc.subjectplankton communitiesen_US
dc.titleFood web functions and interactions during spring and summer in the arctic water inflow region: Investigated through inverse modelingen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record