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Title

Experimental evaluation of the hypothesis that dilution limits DOC utilization in the deep ocean

AuthorsArrieta López de Uralde, Jesús M. ; Mayol, Eva ; Hansman, Roberta L.; Herndl, Gerhard J.; Dittmar, Thorsten; Duarte, Carlos M.
KeywordsDeep-ocean
Dark-ocean
Dissolved organic carbon
DOC
Refractory DOM
Recalcitrant DOM
Microbial degradation
Growth efficiency
Heterotrophic prokaryotes
FT-ICR-MS
Issue Date2-Mar-2015
CitationArrieta López de Uralde, Jesús M.; Mayol, Eva; Hansman, Roberta L.; Herndl, Gerhard J.; Dittmar, Thorsten; Duarte, Carlos M., 2015, Experimental evaluation of the hypothesis that dilution limits DOC utilization in the deep ocean, DIGITAL.CSIC, http://dx.doi.org/10.20350/digitalCSIC/6217
AbstractExperimental results on the hypothesis that deep-water DOC consists of many different, intrinsically labile compounds at concentrations too low to compensate for the metabolic costs associated to their utilization.
DescriptionThe dilution hypothesis was tested by adding different concentrations of ambient DOC obtained by solid phase extraction to deep seawater samples. Microbial growth and consumption of DOC were assessed by flow cytometry, HTCO measurements of DOC and oxygen consumption measurements in 14 experiments using water collected from deep water masses of the Atlantic and Pacific Oceans.There are two kinds of experiments 14 (A-N) where prokaryotic growth was evaluated under increasing concentrations of ambient DOC and 2 additional experiments (O and P) where DOC composition and the utilization of different compounds was evaluated by means of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). A utilization index for each compound was derived from the FT-ICR-MS fingerprints, showing whether the relative signal for each compound remained stable (refractory or not used), decreased (was consumed) or increased (was produced). Detailed information on conditions and procedures can be found in the article. Enquiries can be sent to Jesús M. Arrieta at txetxu[at]mail.com.
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URIhttp://hdl.handle.net/10261/111563
DOIhttp://dx.doi.org/10.20350/digitalCSIC/6217
ReferencesArrieta, J.M.; Mayol, E.; Hansman, R.L.; Herndl,G.J.; Dittmar, T.; Duarte, C.M. Dilution limits dissolved organic carbon utilization in the deep ocean. Science, doi 10.1126/science.1258955.
Appears in Collections:(IMEDEA) Conjuntos de datos
Files in This Item:
File Description SizeFormat 
1_Station_info.xlsx. Sample locations (Experiments A-P)9,52 kBMicrosoft Excel XMLView/Open
2_Prokaryotic_abundance_DOC_Experiments.xlsxProkaryotic abundance (Experiments A-N) 22,44 kBMicrosoft Excel XMLView/Open
3_Growth_vs_DOC.xlsxProkaryotic growth (Experiments A-N) 12,5 kBMicrosoft Excel XMLView/Open
4_PGE.xlsxProkaryotic growth efficiency (experiments K-N) 9,34 kBMicrosoft Excel XMLView/Open
5_DOC.xlsxDOC consumption (experiments K-N) 9,17 kBMicrosoft Excel XMLView/Open
6_FT_ICR_MS_Exp1.xlsxFT-ICR-MS experiment O844,05 kBMicrosoft Excel XMLView/Open
7_FT_ICR_MS_Exp2.xlsxFT-ICR-MS experiment P955,95 kBMicrosoft Excel XMLView/Open
8_UtilIndexExp1.xlsxUtilization Index experiment O692,22 kBMicrosoft Excel XMLView/Open
9_UtilIndexExp2.xlsxUtilization Index experiment P629,09 kBMicrosoft Excel XMLView/Open
ReadMe_DOC_dataset.txt1,63 kBTextView/Open
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