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  • 1
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    Linking diatom-diazotroph symbioses to nitrogen cycle perturbations and deep-water anoxia: Insights from Mediterranean sapropel events (2021)
    Elsevier
    Details
    Publication Date: 2024-02-07
    Description: Elevated organic matter (OM) export flux promotes marine anoxia, thus increasing carbon sequestration efficiency and decreasing atmospheric carbon dioxide levels. However, the mechanisms that trigger and sustain anoxic events-particularly those associated with nutrient-poor, oligotrophic surface waters-remain poorly constrained. Mediterranean Sea sapropels are well-preserved sediments deposited during episodic anoxic events throughout the Plio-Pleistocene; as such, they may provide unique insight into the biogeochemical and ecological drivers of-and responses to-marine anoxia. Using biomarker distributions, we demonstrate that anaerobic ammonium oxidizing (anammox) bacteria and diazotrophic endosymbionts of mat- and/or raft-forming diatoms were both abundant during sapropel events, particularly in the Ionian and Libyan seas. In these sapropels, the carbon isotope compositions of anammox biomarkers directly capture progressive C-13-depletion in deep-water dissolved inorganic carbon, indicating sustained carbon sequestration. To explain these observations, we propose a reinforcing feedback whereby initial nutrient and/or circulation perturbations promote fixed nitrogen loss via intensified anammox and heterotrophic denitrification, which in turn favors proliferation of rapidly sinking diatom-diazotroph symbiotic consortia, increases OM burial flux, and sustains anoxia. This mechanism resolves the long-standing conundrum that small and buoyant diazotrophs are apparently associated with high OM export during periods of marine anoxia and oligotrophy.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    (Tabel S2) GDGT fractional abundances and calculated metrics from the Congo River (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Branched Glycerol dialkyl glycerol tetraethers, fractional abundance Ia; Branched Glycerol dialkyl glycerol tetraethers, fractional abundance Ib; Branched Glycerol dialkyl glycerol tetraethers, fractional abundance Ic; Branched Glycerol dialkyl glycerol tetraethers, fractional abundance IIa; Branched Glycerol dialkyl glycerol tetraethers, fractional abundance IIb; Branched Glycerol dialkyl glycerol tetraethers, fractional abundance IIc; Branched Glycerol dialkyl glycerol tetraethers, fractional abundance IIIa; Branched Glycerol dialkyl glycerol tetraethers, fractional abundance IIIb; Caldarchaeol isomer, fractional abundance; Congo_River; Crenarchaeol isomer, fractional abundance; Cyclization ratio of branched tetraethers; DATE/TIME; Methylation index of dominant branched tetraethers; MULT; Multiple investigations; Ratio; Standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 884 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Congo River particulate and dissolved organic carbon concentrations, isotope compositions (δ¹³C, d15N, D14C), and particulate GDGT distributions (2017)
    PANGAEA
    In:  Supplement to: Hemingway, Jordon D; Schefuß, Enno; Spencer, Robert GM; Dinga, Bienvenu Jean; Eglinton, Timothy Ian; McIntyre, Cameron; Galy, Valier V (2017): Hydrologic controls on seasonal and inter-annual variability of Congo River particulate organic matter source and reservoir age. Chemical Geology, 466, 454-465, https://doi.org/10.1016/j.chemgeo.2017.06.034
    Details
    Publication Date: 2023-01-13
    Description: We present dissolved organic carbon (DOC) concentrations, particulate organic matter (POM) composition (d13C, d15N, D14C, N/C), and particulate glycerol dialkyl glycerol tetraether (GDGT) distributions from a 34-month time-series near the mouth of the Congo River. An end-member mixing model using d13C and N/C indicates that exported POM is consistently dominated by C3 rainforest soil sources, with increasing contribution from C3 vegetation and decreasing contribution from phytoplankton at high discharge. Large C4 inputs are never observed despite covering ~ 13% of the catchment. Low and variable D14C values during 2011 [annual mean = (-148 ± 82) per mil], when discharge from left-bank tributaries located in the southern hemisphere reached record lows, likely reflect a bias toward pre-aged POM derived from the Cuvette Congolaise swamp forest. In contrast, D14C values were stable near -50 per mil between January and June 2013, when left-bank discharge was highest. We suggest that headwater POM is replaced and/or diluted by C3 vegetation and pre-aged soils during transit through the Cuvette Congolaise, whereas left-bank tributaries export significantly less pre-aged material. GDGT distributions provide further evidence for seasonal and inter-annual variability in soil provenance. The cyclization of branched tetraethers and the GDGT-0 to crenarchaeol ratio are positively correlated with discharge (r 〉=0.70; p-value 〈= 4.3 × 10**-5) due to the incorporation of swamp-forest soils when discharge from right-bank tributaries located in the northern hemisphere is high. Both metrics reach record lows during 2013, supporting our interpretation of increased left-bank contribution at this time. We conclude that hydrologic variability is a major control of POM provenance in the Congo River Basin and that tropical wetlands can be a significant POM source despite their small geographic coverage.
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    (Tabel S3) Fractional contribution from Congo River samples and Oubangui River samples (2017)
    PANGAEA
    Details
    Publication Date: 2023-06-24
    Keywords: C3 soils, fractional contribution; C3 vegetation, fractional contribution; Congo_River; DATE/TIME; Event label; MULT; Multiple investigations; Oubangui_River; Phytoplankton, fractional contribution; Reference/source
    Type: Dataset
    Format: text/tab-separated-values, 401 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Mediterranean sapropel bulk organic matter and biomarker concentrations and carbon isotope compositions (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Description: This dataset contains bulk organic matter and biomarker data for two Mediterranean Sea sites: ODP Leg 160 site 964 (including sapropels S5, S7, and i-282) and ODP Leg 160 site 967 (including sapropels S4, S5, and S74). This dataset includes: (i) compiled age model data from the literature; (ii) diagnostic mass spectrometry selective reaction monitoring m/z ratios for bacteriohopanepolyol (BHP) and heterocyst glycol (HG) analysis; (iii) bulk sediment % organic carbon (OC), % total nitrogen (TN), OC-d13C, and TN-d15N; (iv) OC-normalized abundances of various BHPs, HGs, and crenarchaeol; (v) d13C values for BHPs and crenarchaeol; and (vi) literature compilation of Eastern Mediterranean Sea diatom frustule preservation observations. Samples were analyzed at Harvard University in 2017-2018 from samples collected in 1995 during ODP Leg 160; sample ages range from 101 to 3004 kilo years before present. Samples were collected from the Eastern Mediterranean Sea and cover the Ionian and Levantine Seas. These data were generated to study the microbial ecological and biogeochemical responses to ocean anoxia in an enclosed basin; samples were analyzed using mass spectrometric and isotope-ratio mass spectrometric methods (coupled to liquid- and gas-chromatography and elemental analysis). This work was supported by the Gordon and Betty Moore Foundation.
    Keywords: anoxia; Bacteriohopanepolyols; Biomarkers; d13C; d15N; GDGTs; heterocyst glycolipids; Mediterranean Sea; nitrogen cycle; Ocean Drilling Program; ODP; organic matter; sapropels
    Type: Dataset
    Format: application/zip, 7 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Table S5, Abundance of crenarchaeol, bacteriohopanetetrol I (BHT-I), bacteriohopanetetrol II (BHT-II), as well as C5 and C6 heterocyst glycolipids (HGs) in ODP cores at sites 964 and 967 (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Description: Carbon-normalized abundance of individual bacteriohopanetetrol (BHP) and heterocyst glycolipid (HG) compounds, as well as the relative abundance of BHT-I vs. BHT-II and HG-C5 compounds vs. HG-C6 compounds in ODP cores at sites 964 and 967. Concentration data for BHPs and HGs were generated using ultra high-performance liquid chromatography coupled to triple quadrupole mass spectrometry following Kusch et al. (2018) and Wörmer et al. (2012), respectively. This work was supported by the Gordon and Betty Moore Foundation.
    Keywords: 1-(O-hexose)-3,25,27-octacosanetriol (peak area), per unit mass total organic carbon; 1-(O-hexose)-3,25-hexacosanediol (peak area), per unit mass total organic carbon; 1-(O-hexose)-3,27,29-triacontanetriol (peak area), per unit mass total organic carbon; 1-(O-hexose)-3,27-octacosanediol (peak area), per unit mass total organic carbon; 1-(O-hexose)-3,29,31-dotriacontanetriol (peak area), per unit mass total organic carbon; 1-(O-hexose)-3-keto-25-hexacosanol (peak area), per unit mass total organic carbon; 1-(O-hexose)-3-keto-27-octacosanol (peak area), per unit mass total organic carbon; 1-(O-hexose)-3-keto-29,31-dotriacontanediol (peak area), per unit mass total organic carbon; 1-(O-ribose)-3,27,29-triacontanetriol (peak area), per unit mass total organic carbon; 1-(O-ribose)-3,29,31-dotriacontanetriol (peak area), per unit mass total organic carbon; 1-(O-ribose)-3,29-triacontanediol (peak area), per unit mass total organic carbon; 160-964A; 160-964D; 160-964E; 160-967A; 160-967B; 160-967D; Agilent 1290 ultrahigh performance liquid chromatograph coupled to an Agilent 6410 triple-quadrupole mass spectrometer; anoxia; Bacteriohopanepolyols; Bacteriohopanetetrol I (peak area), per unit mass total organic carbon; Bacteriohopanetetrol II, fractional abundance; Bacteriohopanetetrol II (peak area), per unit mass total organic carbon; Biomarkers; C5 heterocyst glycolipids, fractional abundance; C5 heterocyst glycolipids (peak area), per unit mass total organic carbon; C6 heterocyst glycolipids (peak area), per unit mass total organic carbon; Core; Crenarchaeol (peak area), per unit mass total organic carbon; d13C; d15N; Depth, bottom/max; Depth, top/min; DRILL; Drilling/drill rig; Eastern Basin; Event label; GDGTs; heterocyst glycolipids; Heterocyst glycolipids (peak area), per unit mass total organic carbon; Joides Resolution; Leg160; Mediterranean Sea; nitrogen cycle; Ocean Drilling Program; ODP; organic matter; Sapropel layer; sapropels; Site; UPLC-QqQ-MS
    Type: Dataset
    Format: text/tab-separated-values, 2468 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Table S2, Mass-to-charge ratios (m/z) used for selective reaction monitoring of Bacteriohopanepolyols (BHPs) at Quadrupole 1 (Q1) and 3 (Q3) (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Description: Bacteriohopanepolyols (BHPs) were analyzed using an Agilent 1290 ultra high-performance liquid chromatograph coupled to an Agilent 6410 triple quadrupole mass spectrometer equipped with an atmospheric chemical ionization interface operated in positive mode, following Kusch et al. (2018). This work was supported by the Gordon and Betty Moore Foundation.
    Keywords: Agilent 1290 ultrahigh performance liquid chromatograph coupled to an Agilent 6410 triple-quadrupole mass spectrometer; anoxia; Bacteriohopanepolyols; Biomarkers; Compounds; d13C; d15N; GDGTs; heterocyst glycolipids; Mass-to-charge ratio; Mediterranean Sea; nitrogen cycle; Ocean Drilling Program; ODP; organic matter; sapropels; UPLC-QqQ-MS
    Type: Dataset
    Format: text/tab-separated-values, 82 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Table S6, Biomarker isotopic data of crenarchaeol (δ13C Cren.), bacteriohopanetetrol I (δ13C BHT-I), and bacteriohopanetetrol II (δ13C BHT-II) for ODP cores at sites 964 and 967 (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Description: Stable-carbon isotope compositions for crenarchaeol, bacteriohopanetetrol I (BHT-I), and bacteriohopanetetrol II (BHT-II) for ODP cores at sites 964 and 967. All biomarkers were measured using a Thermo Scientific Delta V isotope ratio mass spectrometer at least in triplicate. For BHT-I and BHT-II, compounds were isolated using high-performance preparative liquid chromatography and individually analyzed by high-temperature gas-chromatography-IRMS following Hemingway et al. (2018). Crenarchaeol was isolated using high-pressure preparative chromatography and analyzed using a spooling-wire microcombustion interface on a Thermo Scientific Delta V isotope ratio mass spectrometer at least in quintuplicate following Polik et al. (2018). This work was supported by the Gordon and Betty Moore Foundation.
    Keywords: 160-964A; 160-964D; 160-964E; 160-967A; 160-967D; anoxia; Bacteriohopanepolyols; Bacteriohopanetetrol I, δ13C; Bacteriohopanetetrol I, δ13C, standard deviation; Bacteriohopanetetrol II, δ13C; Bacteriohopanetetrol II, δ13C, standard deviation; Biomarkers; Calculated; Core; Crenarchaeol, F2/F1 ratio; Crenarchaeol, δ13C; Crenarchaeol, δ13C, standard deviation; custom-built spooling-wire microcombustion interface coupled to a Thermo Scientific Delta V isotope ratio mass spectrometer in conflo mode; d13C; d15N; Depth, bottom/max; Depth, top/min; Difference δ13C, Bacteriohopanetetrol I and Bacteriohopanetetrol II; Difference δ13C, crenarchaeol and Bacteriohopanetetrol I; Difference δ13C, crenarchaeol and Bacteriohopanetetrol II; DRILL; Drilling/drill rig; Eastern Basin; Event label; GDGTs; heterocyst glycolipids; Joides Resolution; Leg160; Mediterranean Sea; nitrogen cycle; Ocean Drilling Program; ODP; organic matter; Sapropel layer; sapropels; Site; Thermo Scientific Flash gas chromatograph coupled to a Thermo Scientific Delta V isotope ratio mass spectrometer in conflo mode
    Type: Dataset
    Format: text/tab-separated-values, 562 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Table S1, Composite depths and age models for ODP coring sites 964 and 967 (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Description: This dataset contains composite depths and age models for ODP sites 964 and 967, including: event name, sapropel layer, sample ID, site, hole, core, section, section position, depth (raw), depth (composite, revised), age, comment, and reference. All data were compiled from the literature. This work was supported by the Gordon and Betty Moore Foundation.
    Keywords: 160-964A; 160-964D; 160-964E; 160-967A; 160-967B; 160-967D; AGE; anoxia; Bacteriohopanepolyols; Biomarkers; Core; Core section, comment; d13C; d15N; Depth, composite revised; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Eastern Basin; Event label; From literature; GDGTs; heterocyst glycolipids; Hole; Joides Resolution; Leg160; Mediterranean Sea; nitrogen cycle; Ocean Drilling Program; ODP; organic matter; Reference/source; Sample ID; Sapropel layer; sapropels; Section; Section position; Site
    Type: Dataset
    Format: text/tab-separated-values, 935 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Table S3, Mass-to-charge ratios (m/z) of precursors and product ions as well as collision energies (CE) of diagnostic transitions during multiple reaction monitoring of heterocyst glycolipids at Quadrupole 1 (Q1) and 3 (Q3) (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Description: Heterocyst glycolipids (HGs) were analyzed using an Agilent 1290 ultra high-performance liquid chromatograph coupled to an Agilent 6410 triple quadrupole mass spectrometer equipped with an electrospray ionization interface operated in positive mode, following Wörmer et al. (2012). This work was supported by the Gordon and Betty Moore Foundation.
    Keywords: Agilent 1290 ultrahigh performance liquid chromatograph coupled to an Agilent 6410 triple-quadrupole mass spectrometer; anoxia; Bacteriohopanepolyols; Biomarkers; Collision energy; Compounds; d13C; d15N; GDGTs; heterocyst glycolipids; Mass-to-charge ratio; Mediterranean Sea; nitrogen cycle; Ocean Drilling Program; ODP; organic matter; sapropels; UPLC-QqQ-MS
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
    Location Call Number Limitation Availability
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