Publications des scientifiques de l'IRD

Casey J.R., Aucan Jérôme, Goldberg S.R., Lomas M.W. (2013). Changes in partitioning of carbon amongst photosynthetic pico-and nano-plankton groups in the Sargasso Sea in response to changes in the North Atlantic Oscillation. In : Lomas M.W. (ed.), Church M.J. (ed.), Muller-Karger F.E. (ed.). Measuring ocean change : results from BATS, HOT, and CARIACO. Deep-Sea Research.Part 2 : Topical Studies in Oceanography, 93 (no spécial), p. 58-70. ISSN 0967-0645.

Titre du document
Changes in partitioning of carbon amongst photosynthetic pico-and nano-plankton groups in the Sargasso Sea in response to changes in the North Atlantic Oscillation
Année de publication
2013
Type de document
Article
Auteurs
Casey J.R., Aucan Jérôme, Goldberg S.R., Lomas M.W.
In
Lomas M.W. (ed.), Church M.J. (ed.), Muller-Karger F.E. (ed.), Measuring ocean change : results from BATS, HOT, and CARIACO
Source
Deep-Sea Research.Part 2 : Topical Studies in Oceanography, 2013, 93 (no spécial), p. 58-70 ISSN 0967-0645
Picophytoplankton carbon biomass at the Bermuda Atlantic Time-series Study (BATS) site from June 2004 to December 2010 was estimated from the direct calibration of cellular carbon content and forward light scatter (via flow cytometry). Seasonality and interannual dynamics of Prochlorococcus, Synechococcus and small eukaryotic algae (<12 mu m diameter) abundance, cellular carbon content (Q(C); particulate organic carbon; POC cell(-1)), and group-specific carbon biomass are reported. Q(C) of individual taxa varied with depth and season by as much as an order of magnitude, roughly comparable to variability in abundance. During the time-series there were obvious shifts in the taxonomic distribution of photosynthetic carbon biomass; these interannual shifts in biomass were due to simultaneous changes in both Q(C) and cell abundance. The observed pattern was not apparent from numerical abundance alone, highlighting the importance of Q(C) measurements in place of using fixed conversion factors to better understand biological carbon dynamics. Changes in the phase of the North Atlantic Oscillation (NAO) from positive to negative modes correlated with shifts in biomass between picocyanobacteria and small eukaryotic algae, respectively. Thus, shifts in algal community structure are inferred to be associated with changes in light intensity and implied nutrient supply via mixing (i.e., patterns in upper ocean stability). These observed changes in phytoplankton biomass partitioning were correlated with the important ocean carbon cycle parameters of export flux, mesopelagic transfer efficiency, and elemental stoichiometry. Importantly, interannual relationships between these parameters and algal biomass were detected only when Q(C) was considered as variable.
Plan de classement
Phytoplancton [034BIOVEG02]
Descripteurs
PHYTOPLANCTON ; BIOMASSE ; CARBONE
Description Géographique
ATLANTIQUE
Localisation
Fonds IRD [F B010063352]
Identifiant IRD
fdi:010063352
Contact