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dc.contributor.authorAlcaraz, Miquelen_US
dc.contributor.authorAlmeda García, Rodrigoen_US
dc.contributor.authorDuarte, Carlos M.en_US
dc.contributor.authorHorstkotte, Burkharden_US
dc.contributor.authorLasternas, Sebastienen_US
dc.contributor.authorAgustí, Susanaen_US
dc.description.abstractThe metabolic carbon requirements and excretion rates of three major zooplankton groups in the Southern Ocean were studied in February 2009. The research was conducted in the framework of the ATOS research project as part of the Spanish contribution to the International Polar Year. The objective was to ascertain the possible consequences of the predicted zooplankton shift from krill to salps in the Southern Ocean for the cycling of biogenic carbon and the concentration and stoichiometry of dissolved inorganic nutrients. The carbon respiratory demands and NH4-N and PO4-P excretion rates of <5 mm size copepods, krill and salps were estimated by incubation experiments. The carbon-specific metabolic rates and N:P metabolic quotients of salps were higher than those of krill (furcilia spp. and adults) and copepods, and as expected there was a significant negative relation between average individual zooplankton biomass and their metabolic rates, each metabolic process showing a particular response that lead to different metabolic N:P ratios. The predicted change from krill to salps in the Southern Ocean would encompass not only the substitution of a pivotal group for Antarctic food webs (krill) by one with an indifferent trophic role (salps). In a zooplankton community dominated by salps the respiratory carbon demand by zooplankton will significantly increase, and therefore the proportion of primary production that should be allocated to compensate for the global respiratory C-losses of zooplankton. At the same time, the higher production by salps of larger, faster sinking fecal pellets will increase the sequestration rate of biogenic carbon. Similarly, the higher N and P excretion rates of zooplankton and the changes in the N:P stoichiometry of the metabolic products will modify the concentration and proportion of N and P in the nutrient pool, inducing quantitative and qualitative changes on primary producers that will translate to the whole Southern Ocean ecosystem.en_US
dc.relationATOS - Atmospheric inputs of organic carbon and pollutants to the polar ocean: rates, significance and outlook (POL2006-00550/CTM)en_US
dc.relationPERFIL (CTM 2006-12344-C01)en_US
dc.relation.ispartofFrontiers in Marine Scienceen_US
dc.sourceFrontiers in marine science [ISSN 2296-7745], v.1, 45 (September 2014)en_US
dc.subject251001 Oceanografía biológicaen_US
dc.subject.otherSouthern Oceanen_US
dc.subject.otherCommunity shiftsen_US
dc.subject.otherCarbon cyclingen_US
dc.subject.otherC:N:P stoichiometryen_US
dc.titleChanges in the C, N, and P cycles by the predicted salps-krill shift in the southern oceanen_US
item.fulltextCon texto completo-
item.grantfulltextopen- ECOAQUA: Ecofisiología de Organismos Marinos- de Investigación en Acuicultura Sostenible y Ec- de Investigación en Acuicultura Sostenible y Ec- García, Rodrigo-
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