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dc.contributor.author Paparazzo, Flavio Emiliano
dc.contributor.author Williams, Gabriela Noemí
dc.contributor.author Pisoni, Juan Pablo
dc.contributor.author Solis, Miriam Edith
dc.contributor.author Esteves, Jose Luis
dc.contributor.author Varela, Diana E.
dc.date.available 2017-09-22T18:36:10Z
dc.date.issued 2016-12
dc.identifier.citation Paparazzo, Flavio Emiliano; Williams, Gabriela Noemí; Pisoni, Juan Pablo; Solis, Miriam Edith; Esteves, Jose Luis; et al.; Linking phytoplankton nitrogen uptake, macronutrients and chlorophyll-a in SW Atlantic waters: The case of the Gulf of San Jorge, Argentina; Elsevier Science; Journal Of Marine Systems; 172; 12-2016; 43-50
dc.identifier.issn 0924-7963
dc.identifier.uri http://hdl.handle.net/11336/24950
dc.description.abstract We compared biological and chemical parameters in surface waters of the Gulf of San Jorge to better understand carbon export and the factors that control phytoplankton production in an area of the Argentinian Continental Shelf, a vastly under sampled region of the SW Atlantic Ocean. In April of 2012, we estimated new and regenerated primary production in the Gulf by measuring nitrate and ammonium uptake, respectively. We also measured macronutrient, and in situ chlorophyll-a concentrations, which were compared to chlorophyll-a estimates from remote sensing. Although the Gulf of San Jorge presents high levels of chlorophyll-a and primary production, the relationship between these parameters is not straightforward. Previous studies showed that surface chlorophyll-a explains only part of the variance in euphotic-zone integrated primary production, and that satellite-derived chlorophyll-a underestimates in situ primary production. Our results showed large spatial variability in the Gulf, with transitional physico-chemical conditions, such as fronts, that could favor an increase in biological production. In situ chlorophyll-a concentrations were highest at the mid-shelf station (6.0 mg m−3 ) and lowest at the northernmost location by an order of magnitude. Remote sensing measurements of chlorophyll-a underestimated our in situ chlorophyll-a concentrations. Total nitrogen (nitrate + ammonium) uptake showed relatively similar rates throughout the study area (≈130 nM-N d−1 ), except in the northernmost station where it was much lower (53 nM-N d−1 ). This north region had a distinct water mass and maximal levels of macronutrients (nitrate ≈ 6 μM, ammonium ≈ 1.2 μM, phosphate ≈ 1.2 μM and silicic acid ≈ 4 μM). For the entire sampling region, chlorophyll-a concentrations strongly correlated with total nitrogen uptake (r = 0.76, n = 8, p b 0.05) and new primary production (r = 0.78, n = 8, p b 0.05). Values of the f-ratio were 0.9 in mid-shelf, and ranged between 0.35 and 0.45 in inner and coastal stations. Our results indicate that highest carbon export may occur in the outer part of the Gulf, closer to the mid-shelf region. Further studies will be necessary to better understand the functioning of this ecosystem, including the impact of fisheries and horizontal transport by currents in the overall CO2 balance.
dc.format application/pdf
dc.language.iso eng
dc.publisher Elsevier Science
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject Uptake
dc.subject Nutrients (mineral)
dc.subject Clorophylls
dc.subject Biological production
dc.subject Southwest Atlantic
dc.subject Gulf of San Jorge
dc.subject.classification Oceanografía, Hidrología, Recursos Hídricos
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Linking phytoplankton nitrogen uptake, macronutrients and chlorophyll-a in SW Atlantic waters: The case of the Gulf of San Jorge, Argentina
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2017-06-30T13:28:59Z
dc.journal.volume 172
dc.journal.pagination 43-50
dc.journal.pais Países Bajos
dc.journal.ciudad Amsterdam
dc.description.fil Fil: Paparazzo, Flavio Emiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil Fil: Williams, Gabriela Noemí. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil Fil: Pisoni, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil Fil: Solis, Miriam Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil Fil: Esteves, Jose Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil Fil: Varela, Diana E.. University Of Victoria; Canadá
dc.journal.title Journal Of Marine Systems
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0924796316302494
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jmarsys.2017.02.007


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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)