Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/114813
Campo DC Valoridioma
dc.contributor.authorFernández Urruzola, Igoren_US
dc.contributor.authorOsma Prado, Nataliaen_US
dc.contributor.authorPackard, Theodore Trainen_US
dc.contributor.authorGómez Cabrera, María Milagrosaen_US
dc.contributor.authorPostel, L.en_US
dc.date.accessioned2022-05-19T11:25:27Z-
dc.date.available2022-05-19T11:25:27Z-
dc.date.issued2014en_US
dc.identifier.isbn84-697-0471-0en_US
dc.identifier.urihttp://hdl.handle.net/10553/114813-
dc.description.abstractZooplankton biomass and potential metabolic rates in terms of electron transport system (ETS) and glutamate dehydrogenase (GDH) were analyzed in four size fractions (100-200 µm, 200-500 µm, 500-1000 µm and >1000 µm) along a cross-shelf transect in waters off northern Namibia. The highly variable dynamics of upwelling filaments promoted short-term fluctuations in the zooplankton distribution. Maximum values were characteristically found over the shelf-break, where zooplankton biomass as dry mass (DM) reached peaks of 64.5 mg m−3 within the upper 200 m in late August. Two weeks later, the zooplankton-DM decreased by more than a third (19 mg DM m−3). Zooplankton potential respiration and NH4+ excretion averaged 234 µmol O2 m−3 d−1 and 169 µmol NH4+ m−3 d−1 in the Namibian shelf, respectively. High protein-specific ETS activities even in the low-chlorophyll waters outside the filament suggested a shift into greater omnivory towards the open ocean. This would also explain the decrease of zooplankton biomass and the higher protein-catabolism seaward. In this light, zooplankton elemental and isotopic compositions were used to investigate the pelagic food web interactions. They evidenced spatial changes in the carbon resource for zooplankton as well as in the form of nitrogen that fueled the biological production in aging advected waters. Overall, the zooplankton respiration consumed a small proportion of the daily primary production (0.9 - 9.3%), which argued for the autotrophy of the system during the intense wind-forcing season. Parallel with the respiration, zooplankton NH4+ excretion only contributed from 1 to 12% to the total nitrogen requirements for primary production. This may reveal a zation pathway through microheterotrophs in these Namibian waters.en_US
dc.languageengen_US
dc.subject2510 Oceanografíaen_US
dc.subject251001 Oceanografía biológicaen_US
dc.subject251002 Oceanografía químicaen_US
dc.titleZooplankton biomass and metabolism: Response in the Namibian upwelling.en_US
dc.typeinfo:eu-repo/semantics/conferenceobjecten_US
dc.typeConferenceObjecten_US
dc.relation.conferenceIV Congress of Marine Sciencesen_US
dc.description.lastpage35en_US
dc.description.firstpage35en_US
dc.investigacionCienciasen_US
dc.type2Actas de congresosen_US
dc.description.numberofpages1en_US
dc.identifier.ulpgcen_US
dc.contributor.buulpgcBU-BASen_US
item.grantfulltextnone-
item.fulltextSin texto completo-
crisitem.event.eventsstartdate11-06-2014-
crisitem.event.eventsenddate13-06-2014-
crisitem.author.deptGIR ECOAQUA: Ecofisiología de Organismos Marinos-
crisitem.author.deptIU de Investigación en Acuicultura Sostenible y Ec-
crisitem.author.deptGIR ECOAQUA: Ecofisiología de Organismos Marinos-
crisitem.author.deptIU de Investigación en Acuicultura Sostenible y Ec-
crisitem.author.deptDepartamento de Biología-
crisitem.author.orcid0000-0001-7287-3503-
crisitem.author.orcid0000-0002-5880-1199-
crisitem.author.orcid0000-0002-7396-6493-
crisitem.author.parentorgIU de Investigación en Acuicultura Sostenible y Ec-
crisitem.author.parentorgIU de Investigación en Acuicultura Sostenible y Ec-
crisitem.author.fullNameFernández Urruzola, Igor-
crisitem.author.fullNameOsma Prado, Natalia-
crisitem.author.fullNamePackard, Theodore Train-
crisitem.author.fullNameGómez Cabrera, María Milagrosa-
Colección:Actas de congresos
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