Total phospholipid fatty acid concentrations structrures of ODP Hole 191-1179 samples (Table 1)
Cobertura |
LATITUDE: 41.079817 * LONGITUDE: 159.963150 * DATE/TIME START: 2000-07-25T00:00:00 * DATE/TIME END: 2000-07-25T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.05 m * MAXIMUM DEPTH, sediment/rock: 6.45 m |
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Data(s) |
16/02/2006
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Resumo |
Sediment samples ranging from 0.05 to 278 m below sea floor (mbsf) at a Northwest Pacific deep-water (5564 mbsl) site (ODP Leg 191, Site 1179) were analyzed for phospholipid fatty acids (PLFAs). Total PLFA concentrations decreased by a factor of three over the first meter of sediment and then decreased at a slower rate to approximately 30 mbsf. The sharp decrease over the first meter corresponds to the depth of nitrate and Mn(IV) reduction as indicated by pore water chemistry. PLFA-based cell numbers at site 1179 had a similar depth profile as that for Acridine orange direct cell counts previously made on ODP site 1149 sediments which have a similar water depth and lithology. The mole percentage of straight chain saturated PLFAs increases with depth, with a large shift between the 0.95 and 3.95 mbsf samples. PLFA stable carbon isotope ratios were determined for sediments from 0.05 to 4.53 mbsf and showed a general trend toward more depleted d13C values with depth. Both of these observations may indicate a shift in the bacterial community with depth across the different redox zones inferred from pore water chemistry data. The PLFA 10me16:0, which has been attributed to the bacterial genera Desulfobacter in many marine sediments, showed the greatest isotopic depletion, decreasing from -20 to -35 per mil over the first meter of sediment. Pore water chemistry suggested that sulfate reduction was absent or minimal over this same sediment interval. However, 10me16:0 has been shown to be produced by recently discovered anaerobic ammonium oxidizing (anammox) bacteria which are known chemoautotrophs. The increasing depletion in d13C of 10me16:0 with the unusually lower concentration of ammonium and linear decrease of nitrate concentration is consistent with a scenario of anammox bacteria mediating the oxidation of ammonium via nitrite, an intermediate of nitrate reduction. |
Formato |
text/tab-separated-values, 370 data points |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.757372 doi:10.1594/PANGAEA.757372 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Mills, Christopher T; Dias, Robert F; Graham, Dennis; Mandernack, Kevin W (2006): Determination of phospholipid fatty acid structures and stable carbon isotope compositions of deep-sea sediments of the Northwest Pacific, ODP site 1179. Marine Chemistry, 98(2-4), 197-209, doi:10.1016/j.marchem.2005.10.001 |
Palavras-Chave | #10-methyl-Hexadecanoic acid of total fatty acids; 10-methyl-Octadecanoic acid of total fatty acids; 10-methyl-pentadecanoic acid of total fatty acids; 10-methyl-tetradecanoic acid of total fatty acids; 11-methyloctadec-12-enoic acid of total fatty acids; 12-methyl-Tetradecanoic acid of total fatty acids; 14-methyl-Hexadecanoic acid of total fatty acids; 191-1179; Cells; cis-9-Hexadecenoic acid of total fatty acids; COMPCORE; Composite Core; cyclo-Nonadecanoic acid of total fatty acids; Cyclopropane fatty acid of total fatty acids; Dekapodorhabdus typicus; DEPTH, sediment/rock; Docosanoic acid of total fatty acids; Heneicosanoic acid of total fatty acids; Heptadecanoic acid of total fatty acids; Heptadecenoic acid/15-methyl-heptadecanoic acid ratio; Heptadecenoic acid of total fatty acids; Hexacosanoic acid of total fatty acids; Hexadecanoic acid of total fatty acids; Icosanoic acid of total fatty acids; iso-Heptadecanoic acid of total fatty acids; iso-Hexadecanoic acid of total fatty acids; iso-Octadecanoic acid of total fatty acids; iso-Pentadecanoic acid of total fatty acids; Joides Resolution; Leg191; Methyleicosanoic acid of total fatty acids; Methylnonadecanoic acid of total fatty acids; Nonadecanoic acid of total fatty acids; North Pacific Ocean; Ocean Drilling Program; Octadecanoic acid of total fatty acids; ODP; Pentadecanoic acid of total fatty acids; Phospholipid fatty acids; Saturated fatty acids of total fatty acids; Tetracosanoic acid of total fatty acids; Tetradecanoic acid of total fatty acids; Total branched fatty acids of total fatty acids; Tricosanoic acid of total fatty acids; Unsaturated fatty acids/cyclic fatty acids ratio |
Tipo |
Dataset |