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17-Jun-2017 16:39

Therefore, the D/H ratio of fatty acids is a promising tool to investigate community metabolism in nature. Box plots of D/H fractionations between the C16:0 fatty acid and culture medium observed in different culture experiments.

Cultures included from this study are Thiocapsa roseopersicina, Halochromatium glycolicum, Isochrysis galbana, Thiobacillus denitrificans and Pseudomonas sp.. Funding: NIOZ internal competition (SH) and NWO Medium Sized Investments (GC-TC-ir MS).

Paleosalinity is the single most important oceanographic parameter which currently can still not be accurately quantified from sedimentary records.

To date, the most promising tool to estimate paleosalinity variations combines reconstructions of paleotemperature and foraminiferal δ18O.

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Photoautrophs (εlipid/water between -149 ‰ and -264 ‰) and chemoautotrophs (εlipid/water between -217 ‰ and -275 ‰) produce fatty acids depleted in D.

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In contrast, for this species and another common oceanic haptophyte alga, Gephyrocapsa oceanica, cultured at different salinities and temperatures, hydrogen isotope fractionation was found to depend on salinity and, to some degree, on growth rate (Schouten et al., 2006) and growth phase (Wolhowe et al., 2009). huxleyi largely depends on salinity and the δD of water, which in itself is correlated to salinity in the natural environment (see above).

• Labeling experiments using stable isotopes to study organism and ecosystem functioning.

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