Summit, Melanie; Peacock, Aaron D; Ringelberg, David; White, David C; Baross, John A (2000): Geochemistry, microbiology and phospholipid fatty acid content of ODP Site 169-1036 sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788677, Supplement to: Summit, M et al. (2000): Phospholipid fatty acid-derived microbial biomass and community dynamics in hot, hydrothermally influenced sediments from Middle Valley, Juan De Fuca Ridge. In: Zierenberg, RA; Fouquet, Y; Miller, DJ; Normark, WR (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 169, 1-19, https://doi.org/10.2973/odp.proc.sr.169.117.2000
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Abstract:
Phospholipid fatty acids were measured in samples of 60°-130°C sediment taken from three holes at Site 1036 (Ocean Drilling Program Leg 169) to determine microbial community structure and possible community replacement at high temperatures. Five of six samples had similar concentrations of phospholipid fatty acids (2-6 pmol/g dry weight of sediment), and biomass estimates from these measurements compare favorably with direct microscopic counts, lending support to previous microscopic measures of deep sedimentary biomass. Very long-chain phospholipid fatty acids (21 to 30 carbons) were detected in the sediment and were up to half the total phospholipid fatty acid measured; they appear to increase in abundance with temperature, but their significance is not known. Community composition from lipid analysis showed that samples contained standard eubacterial membrane lipids but no detectable archaeal lipids, though archaea would be expected to dominate the samples at high temperatures. Cluster analysis of Middle Valley phospholipid fatty acid compositions shows that lipids in Middle Valley sediment samples are similar to each other at all temperatures, with the exception of very long-chain fatty acids. The data neither support nor deny a shift to a high-temperature microbial community in hot cores, so at the present time we cannot draw conclusions about whether the microbes observed in these hot sediments are active.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 48.456385 * Median Longitude: -128.710124 * South-bound Latitude: 48.456160 * West-bound Longitude: -128.710500 * North-bound Latitude: 48.456610 * East-bound Longitude: -128.709750
Date/Time Start: 1996-09-15T21:15:00 * Date/Time End: 1996-09-16T18:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Summit, M; Peacock, AD; Ringelberg, D et al. (2000): (Table T1) Geochemical and microbiological characteristics of ODP Site 169-1036 sediments. https://doi.org/10.1594/PANGAEA.788675
- Summit, M; Peacock, AD; Ringelberg, D et al. (2000): (Table T2) Mole percentages of phospholipid fatty acids in ODP Site 169-1036 sediments. https://doi.org/10.1594/PANGAEA.788676