Bacterial distribution and activity at the water-sediment boundary layer on NW Mediterranean continental margin
| Autor: | A.L. Bianchi, Olivier Tholosan |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
0106 biological sciences
Mediterranean climate geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ecology Continental shelf 010604 marine biology & hydrobiology Sediment Pelagic zone Aquatic Science 01 natural sciences Bottom water Oceanography Mediterranean sea Continental margin Benthic zone 14. Life underwater Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences |
| Zdroj: | Marine Ecology Progress Series. 168:273-283 |
| ISSN: | 1616-1599 0171-8630 |
| DOI: | 10.3354/meps168273 |
| Popis: | We studied the distribution of bacterial populations and their catabolic activities [I4C-glutamate respirat~on and Leu-MCA (L-leucine-7-amido-4-methyl-coumarin hydrochloride) hydrolysis] in a set of samples collected in the near bottom waters and in the superficial sediments (0 to 41 cm depth) originating from 9 cores collected between 585 and 2065 m depth in diverse NW Mediterranean continental margins. Bacterial densities and respiratlon rates in the sedlment generally exceeded counts and rates in the near bottom water by 4 orders of magnitude. The relative contributions of benthic and pelagic bacteria to the organic matter turnover in this oceanic area are discussed. Data showed that the highest bacterial densities, as well as the highest rates of glutamate mineralizat~on, were usually in the most superficial layers of sediment, whereas proteolysls rates were frequently maxlmal nearly 5 cm deeper. This pattern for proteolysis differs from the decreasing gradient usually described. |
| Databáze: | OpenAIRE |
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