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Abstract:

Surface particulate organic matter (POM) along a transect from Subantarctic coastal waters on the Argentine shelf to the Bellingshausen Sea was characterized by its organic carbon (POC) and nitrogen (PON) content and δ13C and δ15N signatures in relation to sea surface water temperature (SST), nutrients and plankton. The correlation of δ13C with SST was highly significant for the entire transect but less obvious within Subantarctic shelf ecosystems. Stable isotopes of POM varied from δ13C ~ - 12‰ and δ15N ~ 8‰ in Subantarctic shallow waters to δ13C ~ - 32‰ and δ15N ~ - 2‰ in the sector including the oceanic Subantarctic waters and the Antarctic region. In Argentine shelf waters δ13C was > - 24‰ (on average - 20.9‰) and more variable than in oceanic Subantarctic and Antarctic waters (average of - 27.6‰). High isotopic variability of POM in northern Argentine shelf waters is probably due to a pronounced nutrient gradient. There, a sharp δ13C decrease of ca. 12‰ was associated to an increase of the silicate to nitrate (Si:N) ratio to values > 0.25, and an increase of siliceous phytoplankton. Further south, Si:N ratios > 1 did not significantly affect δ13C, and the influence of the sea surface temperature (SST) was more evident. δ15N in POM of Argentine shelf waters averaged 6.3 ± 2.4‰, and the lowest δ15N values (- 1.7‰) occurred in the northern Drake Passage, where they build, together with δ13C around - 27‰, a clearly distinct pattern in the western South Atlantic. For the whole transect, SST alone accounted for 74% of the δ13C variability. A multiple regression including SST, ammonium and POC explained 83% of δ13C variance. The fit improvement by ammonium involved the nutrient-poor, regenerative system in the northernmost shallow sector and the Subantarctic shelf. δ15N showed a strong inverse relationship with the fraction of unutilized nitrate, probably due to isotopic enrichment in the nitrate pool by phytoplankton uptake. © 2009 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Characteristics of suspended particulate organic matter in the southwestern Atlantic: Influence of temperature, nutrient and phytoplankton features on the stable isotope signature
Autor:Lara, R.J.; Alder, V.; Franzosi, C.A.; Kattner, G.
Filiación:Centre for Tropical Marine Ecology, Fahrenheitstr. 6, 28359 Bremen, Germany
Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina
Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, C1033AAJ Buenos Aires, Argentina
Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
Palabras clave:Nutrients; Plankton; Seston; Southwestern Atlantic; Stable isotopes; Temperature; Antarctic regions; Coastal waters; Drake passage; Inverse relationship; Isotopic enrichment; Multiple regressions; N value; Nutrient gradients; Particulate organic matters; Plankton; Regenerative system; Sea surface temperatures; Sea surfaces; Seston; Shallow waters; Shelf ecosystems; Shelf waters; South Atlantic; Southwestern Atlantic; Stable isotopes; Subantarctic waters; Suspended particulates; Algae control; Ammonium compounds; Atmospheric temperature; Biogeochemistry; Biological materials; Isotopes; Ocean habitats; Organic carbon; Phytoplankton; Seawater; Silicates; Submarine geophysics; Surface waters; Nutrients; coastal water; correlation; nutrient enrichment; phytoplankton; regeneration; sea surface temperature; seston; stable isotope; Atlantic Ocean; Atlantic Ocean (Southwest)
Año:2010
Volumen:79
Número:1-2
Página de inicio:199
Página de fin:209
DOI: http://dx.doi.org/10.1016/j.jmarsys.2009.09.002
Título revista:Journal of Marine Systems
Título revista abreviado:J. Mar. Syst.
ISSN:09247963
CODEN:JMASE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09247963_v79_n1-2_p199_Lara

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Citas:

---------- APA ----------
Lara, R.J., Alder, V., Franzosi, C.A. & Kattner, G. (2010) . Characteristics of suspended particulate organic matter in the southwestern Atlantic: Influence of temperature, nutrient and phytoplankton features on the stable isotope signature. Journal of Marine Systems, 79(1-2), 199-209.
http://dx.doi.org/10.1016/j.jmarsys.2009.09.002
---------- CHICAGO ----------
Lara, R.J., Alder, V., Franzosi, C.A., Kattner, G. "Characteristics of suspended particulate organic matter in the southwestern Atlantic: Influence of temperature, nutrient and phytoplankton features on the stable isotope signature" . Journal of Marine Systems 79, no. 1-2 (2010) : 199-209.
http://dx.doi.org/10.1016/j.jmarsys.2009.09.002
---------- MLA ----------
Lara, R.J., Alder, V., Franzosi, C.A., Kattner, G. "Characteristics of suspended particulate organic matter in the southwestern Atlantic: Influence of temperature, nutrient and phytoplankton features on the stable isotope signature" . Journal of Marine Systems, vol. 79, no. 1-2, 2010, pp. 199-209.
http://dx.doi.org/10.1016/j.jmarsys.2009.09.002
---------- VANCOUVER ----------
Lara, R.J., Alder, V., Franzosi, C.A., Kattner, G. Characteristics of suspended particulate organic matter in the southwestern Atlantic: Influence of temperature, nutrient and phytoplankton features on the stable isotope signature. J. Mar. Syst. 2010;79(1-2):199-209.
http://dx.doi.org/10.1016/j.jmarsys.2009.09.002