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  • 1
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    A deep-learning automated image recognition method for measuring pore patterns in closely related bolivinids and calibration for quantitative nitrate paleo-reconstructions (2023)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: Eutrophication is accelerating the recent expansion of oxygen-depleted coastal marine environments. Several bolivinid foraminifera are abundant in these oxygen-depleted settings, and take up nitrate through the pores in their shells for denitrification. This makes their pore density a possible nitrate proxy. This study documents three aspects related to the porosity of bolivinids. 1. A new automated image analysis technique to determine the number of pores in bolivinids is tested. 2. The pore patterns of Bolivina spissa from five different ocean settings are analysed. The relationship between porosity, pore density and mean pore size significantly differs between the studied locations. Their porosity is mainly controlled by the size of the pores at the Gulf of Guayaquil (Peru), but by the number of pores at other studied locations. This might be related to the presence of a different cryptic Bolivina species in the Gulf of Guayaquil. 3. The pore densities of closely related bolivinids in core-top samples are calibrated as a bottom-water nitrate proxy. Bolivina spissa and Bolivina subadvena showed the same correlation between pore density and bottom-water nitrate concentrations, while the pore density of Bolivina argentea and Bolivina subadvena accumeata is much higher.
    Type: Article , PeerReviewed
    Format: text
    Format: other
    Format: other
    Format: other
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    The FORCIS database: A global census of planktonic Foraminifera from ocean waters (2023)
    Springer
    Details
    Publication Date: 2024-02-07
    Description: Planktonic Foraminifera are unique paleo-environmental indicators through their excellent fossil record in ocean sediments. Their distribution and diversity are affected by different environmental factors including anthropogenically forced ocean and climate change. Until now, historical changes in their distribution have not been fully assessed at the global scale. Here we present the FORCIS (Foraminifera Response to Climatic Stress) database on foraminiferal species diversity and distribution in the global ocean from 1910 until 2018 including published and unpublished data. The FORCIS database includes data collected using plankton tows, continuous plankton recorder, sediment traps and plankton pump, and contains similar to 22,000, similar to 157,000, similar to 9,000, similar to 400 subsamples, respectively (one single plankton aliquot collected within a depth range, time interval, size fraction range, at a single location) from each category. Our database provides a perspective of the distribution patterns of planktonic Foraminifera in the global ocean on large spatial (regional to basin scale, and at the vertical scale), and temporal (seasonal to interdecadal) scales over the past century.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Seawater trace element data and pre- and post-foraminifer experiment alkalinity and pH (2018)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; Autotitrator Metrohm 785 and electrode; Barium/Calcium ratio; Barium/Calcium ratio, standard deviation; Comment; Experiment; ICP-MS, Agilent 7500-ce; Number of observations; pH; Strontium-86/Strontium-88, standard deviation; Strontium-86/Strontium-88 ratio; Strontium-87/Strontium-88, standard deviation; Strontium-87/Strontium-88 ratio; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 98 data points
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    DATA PANGAEA
  • 4
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    Average barium/calcium ratios of cultured foraminifer specimens of Neogloboquadrina dutertrei, listed by experiment (2018)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Barium/Calcium ratio; Experiment; ICP-MS, Agilent 7500-ce; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Neogloboquadrina dutertrei, Barium/Calcium ratio; pH; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 325 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Geochemical Measurements of Kelp in the Santa Barbara Basin, CA (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-22
    Keywords: Biological sample; BIOS; Carbon Burial; Carbon Preference Index; Continental Margin; Flood; Location; Macrocystis pyrifera, biomass as carbon; Macrocystis pyrifera, biomass as nitrogen; Macrocystis pyrifera, carbon/nitrogen ratio; Macrocystis pyrifera, δ13C; Macrocystis pyrifera, δ18O; n-Alkane, algal; n-Alkane, macrophytes; n-Alkane, terrestrial; n-Alkane C13; n-Alkane C14; n-Alkane C15; n-Alkane C16; n-Alkane C17; n-Alkane C18; n-Alkane C19; n-Alkane C20; n-Alkane C21; n-Alkane C22; n-Alkane C23; n-Alkane C24; n-Alkane C25; n-Alkane C26; n-Alkane C27; n-Alkane C28; n-Alkane C29; n-Alkane C30; n-Alkane C31; n-Alkane C33; Normalized; Sample material; Santa_Barbara_Coal_Point; Terrestrial Organic Matter; turbidite
    Type: Dataset
    Format: text/tab-separated-values, 54 data points
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    DATA PANGAEA
  • 6
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    Barium/calcium ratios in planktic foraminifer Neogloboquadrina dutertrei (2018)
    PANGAEA
    In:  Supplement to: Fehrenbacher, Jennifer; Russell, Ann D; Davis, Catherine V; Spero, Howard J; Chu, Edward; Hönisch, Bärbel (2018): Ba/Ca ratios in the non-spinose planktic foraminifer Neogloboquadrina dutertrei: Evidence for an organic aggregate microhabitat. Geochimica et Cosmochimica Acta, 236, 361-372, https://doi.org/10.1016/j.gca.2018.03.008
    Details
    Publication Date: 2023-01-13
    Description: Dataset contains seawater and foraminiferal chemical composition from the paper referenced above. Paper abstract: Ba/Ca ratios in many non-spinose planktic foraminifera are markedly higher than those observed in spinose planktic species, but the cause for these high Ba/Ca ratios is not understood. A better understanding of this geochemical anomaly could provide insights into the habitat and/or controls over Ba incorporation in these species and expand their utility in paleoclimate research. In spinose species, shell Ba/Ca depends only on the Ba/Ca ratio of seawater. Proposed explanations for high non-spinose Ba/Ca include (1) the empirical partition coefficient, DBa, differs from the spinose species, (2) shell Ba varies with seawater temperature and pH, or (3) non-spinose foraminifers have a preference for prey that has elevated Ba. We performed laboratory culture experiments to determine DBa for the thermocline-dwelling non-spinose planktic foraminifer Neogloboquadrina dutertrei. We find that the Ba/Ca ratio of foraminiferal calcite secreted in the laboratory varies linearly with the Ba/Ca ratio of the seawater. The DBa for this species, 0.11 ± 0.008 (2SE; 95% CL), is similar to the DBa for spinose species (0.13 ± 0.004, 2SE; 95% CL). As in spinose species, the Ba/Ca ratio of cultured specimens of N. dutertrei is not influenced by culture temperature (12-22 °C) or seawater pHNBS (range 7.8-8.3). However, the Ba/Ca ratio of individual plankton-tow N. dutertrei specimens that completed their lifecycle in the ocean exceeds the Ba/Ca ratio of cultured specimens by up to three orders of magnitude. It is unlikely this difference between cultured specimens and ocean-grown specimens is due to seawater [Ba] variability, since seawater Ba/Ca ratios calculated using our DBa are much higher than exist in the ocean. Rather, we suggest that elevated shell Ba/Ca in plankton tow and fossil N. dutertrei is due to calcification in the microenvironment of marine organic aggregates such as marine snow, where [Ba] is elevated as a result of Ba release from biogenic particulates.
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 7
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    800 years of carbonate ion concentration and area-density of Globigerinoides ruber from the Cariaco Basin (2019)
    PANGAEA
    In:  Supplement to: Davis, Ashley N; Davis, Catherine V; Thunell, Robert C; Osborne, Emily B; Black, David E; Benitez-Nelson, Claudia R (2019): Reconstructing 800 Years of Carbonate Ion Concentration in the Cariaco Basin Using the Area Density of Planktonic Foraminifera Shells. Paleoceanography and Paleoclimatology, 34(12), 2129-2140, https://doi.org/10.1029/2019PA003698
    Details
    Publication Date: 2023-01-13
    Description: Record of Cariaco Basin near-surface [CO₃²⁻] from 1240-2007 C.E. derived from the area-density (shell weight (μg)/shell area (μm²)) of the planktonic foraminifer Globigerinoides ruber (pink). Area-density is used as a proxy for [CO₃²⁻] following the relationship presented in Marshall et al. (2013), using the two cores PL07-71-BC and CAR25-1
    Keywords: Age; Area in square milimeter; CAR25-1; Carbonate ion; CDRILL; Core drilling; Depth, bottom/max; Depth, top/min; Event label; Globigerinoides ruber pink; Globigerinoides ruber pink, density, standard deviation; Globigerinoides ruber pink, density per area; Globigerinoides ruber pink, weight; PL07-71-BC; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 721 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Seawater chemistry in San Pedro Basin (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Barium; Barium/Calcium ratio; Calcium; Collection Site; DEPTH, water; Event label; ICP-MS, Agilent 7500-ce; Latitude of event; Longitude of event; MULT; Multiple investigations; Number of observations; Optional event label; San_Pedro_Basin; San Pedro Ocean Time Series; SPOT; Strontium; Strontium/Calcium ratio
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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    DATA PANGAEA
  • 9
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    Geochemical Data for Floods, Turbidites, and Droughts over the past 2000 years in the Santa Barbara Basin, CA (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: This dataset provides geochemical data for the Santa Barbara Basin, CA. Sediment was analyzed from sediment core SPR901-03KC, five river sites and a sediment trap. River locations correspond to the locations in Napier et al. (2019; doi:10.1130/B32035.1). The geochemical data include the δ13C, δ15N, Total Organic Carbon (TOC), Total Nitrogen (TN), molar carbon: nitrogen ratios (C/N), Mass Accumulation Rates (MAR), and n-alkane concentration by chain length. These measurements were labelled by depth in the sediment core and categorized by type of event. Event type (flood, turbidite, drought, background) were previously determined Scanning X-Ray Fluorescence (Hendy et al., 2015: doi:10.1016/j.quaint.2015.01.026). The age model for the sediment core was previously determined by Hendy et al. (2013: doi:10.1016/j.quaint.2015.01.142). This data was used to determine the impact of episodic flood, turbidite, and prolonged drought on the organic carbon burial in the Santa Barbara Basin, CA.
    Keywords: Carbon Burial; Continental Margin; Flood; Terrestrial Organic Matter; turbidite
    Type: Dataset
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 10
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    Geochemical Measurements of Sediment Trap Flood and Background Sediments in the Santa Barbara Basin, CA (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Keywords: Carbon, organic, total; Carbon/Nitrogen ratio; Carbon Burial; Carbon Preference Index; Continental Margin; DATE/TIME; Flood; n-Alkane, algal; n-Alkane, macrophytes; n-Alkane, terrestrial; n-Alkane C13; n-Alkane C14; n-Alkane C15; n-Alkane C16; n-Alkane C17; n-Alkane C18; n-Alkane C19; n-Alkane C20; n-Alkane C21; n-Alkane C22; n-Alkane C23; n-Alkane C24; n-Alkane C25; n-Alkane C26; n-Alkane C27; n-Alkane C28; n-Alkane C29; n-Alkane C30; n-Alkane C31; Nitrogen, total; Normalized; Phytane; Pristane; Sample ID; Santa_Barbara_Basin; Santa Barbara Channel; Terrestrial Organic Matter; Trap, sediment; TRAPS; turbidite; Type; X-ray fluorescence after Hendy et al. (2015); δ13C; δ15N
    Type: Dataset
    Format: text/tab-separated-values, 216 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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