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• W2012145354 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 332:93-106 (2007) - doi:10.3354/meps332093 Role of plankton communities in sea–air variations in pCO2 in the SW Atlantic Ocean Irene R. Schloss1,2,*, Gustavo A. Ferreyra1, Martha E. Ferrario2,3, Gastón O. Almandoz2,3, Raúl Codina3, Alejandro A. Bianchi4,5, Carlos F. Balestrini5, Héctor A. Ochoa1, D. Ruiz Pino6, Alain Poisson6 1Instituto Antártico Argentino, Cerrito 1248 1010 Ciudad de Buenos Aires, Argentina 2CONICET, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Av. Rivadavia 1917 1033, Buenos Aires, Argentina 3Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina 4Departamento Ciencias de la Atmósfera y los Océanos, FCEN, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, 1428 Ciudad de Buenos Aires, Argentina 5Departamento Oceanografía, Servicio de Hidrografía Naval, Avenida Montes de Oca 2124, 1212 Ciudad de Buenos Aires, Argentina 6LOCEAN, Laboratoire D’Oceanographie et du Climat: Experimentation et Analyse Numerique, UPMC, Universite Pierre et Marie Curie, Case 100, 4 Place Jussieu, 75252 Paris Cedex 05, France *Email: ischloss@dna.gov.ar ABSTRACT: The influence of the plankton community structure on carbon dynamics was studied in the surface waters of the Argentinean continental shelf (SW Atlantic Ocean) in summer and fall 2002, 2003 and 2004. The horizontal changes in plankton community respiration (R), net community production (NCP) and gross primary production (GPP) were (1) compared with the difference in the partial pressure of CO2 (pCO2) between the sea surface and the atmosphere (ΔpCO2), (2) compared with oxygen saturation and (3) related to the microscopic phytoplankton assemblages. This area, which has recently been shown to be a CO2 sink, had an average surface oxygen saturation of 108.1%, indicating that net photosynthesis could have played a dominant role in the CO2 dynamics. At most stations, the production:respiration (GPP:R) ratio was greater than 1, indicating that planktonic communities were autotrophic; the average GPP:R ratio for the whole study was 2.99. Phytoplankton biomass (chlorophyll a) and NCP showed an inverse relationship with ΔpCO2 and a direct relationship with %O2 saturation when phytoplankton assemblages were dominated by diatoms (30% of the stations). This was not the case when small (≤5 µm) flagellates were the most abundant organisms. Although NCP was mostly positive for both groups of stations (i.e. diatom-dominated or small flagellate-dominated), other physical and biological processes are thought to modify the CO2 dynamics when small flagellates are the prevailing phytoplankton group. KEY WORDS: Gross primary production · Net primary production · Respiration · Phytoplankton composition · pCO2 · Oxygen saturation · SW Atlantic · Continental shelf Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 332. Online publication date: March 05, 2007 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2007 Inter-Research." @default.
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• W2012145354 title "Role of plankton communities in sea–air variations in pCO2 in the SW Atlantic Ocean" @default.
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