Organic matter in surface seston from the SW Atlantic and Southern Ocean:

LARA RJ; ALDER V.A; FRANZOSI C; KATTNER G

JOURNAL OF MARINE SYSTEMS

ELSEVIER

Año: 2010 vol. 79 p. 199 - 209

0924-7963

Surface particulate organic matter (POM) along a transect from Subantarctic coastal waters on the Argentine shelf to the Bellingshausen Sea was characterized by organic carbon (POC) and nitrogen (PON) content and C13 and N15 signatures in relation to sea surface water temperature (SST), nutrients and plankton. Correlation of C13 with SST was highly significant for the entire transect but less obvious within Subantarctic shelf ecosystems. C 13 and N15 ranged from around 12 and 8 in Subantarctic shallow waters to ca. 32 and 2 for N15 in the sector including the oceanic Subantarctic waters and the Antarctic region. The fit improvement by ammonium involved the nutrient-poor, regenerative system in the northernmost shallow sector and the Subantarctic shelf. N15 showed an strong inverse relationship with a non-linear estimation of the amount of unutilized nitrate, probably due to isotopic enrichment in the nitrate pool by phytoplankton uptake. Nota: El MS esta en la instancia de aceptado con cambios menores, pero será publicado en 2009,  ni bien se envie la version final de figuras, etc.