Biogenic silica and particulate organic matter from the indian sector of the Southern Ocean
1988; Elsevier BV; Volume: 23; Issue: 1-2 Linguagem: Inglês
10.1016/0304-4203(88)90030-8
ISSN1872-7581
AutoresPaul Tréguer, Stéphanie Gueneley, Akiyoshi Kamatani,
Tópico(s)Marine and coastal plant biology
ResumoSuspended matter was collected from surface and deep waters (0–3500 m) along a transect from the polar front to Prydz Bay ice edge 17(Indian sector of the Southern Ocean) during the summer ANTIPROD III-APSARA II cruise (January–March 1984), and analyzed for biogenic silica. Particulate organic carbon and nitrogen, and particulate phosphorus and aluminum were also determined in Antarctic surface waters (0–100 m depths). In spite of high nutrient levels, the concentrations of biogenic matter in surface waters were low (<2 μmol 1−1 for silica, < 12 μmol 1−1 for carbon, < 1.5 μmol 1−1 for nitrogen and < 0.1 μmol 1−1 for phosphorus) which was consistent with the low living phytoplankton biomass estimated from the chlorophyll-α (< 0.5 μg 1−1). Biogenic silica concentrations exhibited a minimum (< 0.10 μmol 1−1) in warm deep water. POC/PON and POC/P-P ratios were close to those of a previous study. Biogenic-silica/POC ratios were variable, but were around > 0.13 (mol/mol) for most samples. The observed distribution of biogenic silica is interpreted as being due to the last step of the seasonal evolution of the ecosystem.
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