Abiotic characteristics and diatom abundance and biomass in different sectors of the Argentinien Shelf and antartic waters ...

• Main Authors: Olguín, Héctor F, Alder, Viviana A
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2011
• Subjects: International Polar Year 2007-2008 IPY; Antarc*; Antarctic; antartic*; International Polar Year; IPY; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.818059; https://doi.pangaea.de/10.1594/PANGAEA.818059

A large spatial scale study of the diatom species inhabiting waters from the subantarctic (Argentine shelf) to antarctic was made for the first time in order to understand the relationships between these two regions with regard to the fluctuations in diatom abundances in relation with environmental features, their floristic associations and the effect of the Polar Front as a biogeographic barrier. Species-specific diatom abundance, nutrient and chlorophyll-a concentration were assessed from 64 subsurface oceanographic stations carried out during the austral summer 2002, a period characterized by an anomalous sea-ice coverage corresponding to a ''warm year". Significant relationships of both diatom density and biomass with chlorophyll-a (positive) and water temperature (negative) were found for the study area as a whole. Within the Subantarctic region, diatom density and biomass values were more uniform and significantly (in average: 35 and 11 times) lower than those of the Antarctic region, and did not ... : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...