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  • PANGAEA  (8)
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  • 1
    Publication Date: 2023-11-25
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; Calcium concentration change; Calculated; Comment; EPOCA; European Project on Ocean Acidification; Mediterranean Sea Acidification in a Changing Climate; MedSeA; pH change
    Type: Dataset
    Format: text/tab-separated-values, 293 data points
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  • 2
    Publication Date: 2023-11-25
    Keywords: Ammonia sp., size; Backlit microscope (Zeiss Axiovert 200 M); BIOACID; Biological Impacts of Ocean Acidification; Calculated; EPOCA; European Project on Ocean Acidification; Identification; Mediterranean Sea Acidification in a Changing Climate; MedSeA; pH change
    Type: Dataset
    Format: text/tab-separated-values, 134 data points
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  • 3
    Publication Date: 2023-11-25
    Keywords: Ammonia sp., size; Backlit microscope (Zeiss Axiovert 200 M); BIOACID; Biological Impacts of Ocean Acidification; Calculated; Duration; EPOCA; European Project on Ocean Acidification; Identification; Mediterranean Sea Acidification in a Changing Climate; MedSeA
    Type: Dataset
    Format: text/tab-separated-values, 109 data points
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  • 4
    Publication Date: 2023-11-25
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; Calcium; EPOCA; European Project on Ocean Acidification; Friction velocity; Measured; Mediterranean Sea Acidification in a Changing Climate; MedSeA; pH; pH meter, WTW, 340i; Salinity; Saturation light intensity; Temperature, water; Thermometer; Time in hours
    Type: Dataset
    Format: text/tab-separated-values, 50393 data points
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  • 5
    Publication Date: 2023-11-25
    Description: Calcareous foraminifera are well known for their CaCO3 shells. Yet, CaCO3 precipitation acidifies the calcifying fluid. Calcification without pH regulation would therefore rapidly create a negative feedback for CaCO3 precipitation. In unicellular organisms, like foraminifera, an effective mechanism to counteract this acidification could be the externalization of H+ from the site of calcification. In this study we show that a benthic symbiont-free foraminifer Ammonia sp. actively decreases pH within its extracellular microenvironment only while precipitating calcite. During chamber formation events the strongest pH decreases occurred in the vicinity of a newly forming chamber (range of gradient about 100 µm) with a recorded minimum of 6.31 (〈 10 µm from the shell) and a maximum duration of 7 h. The acidification was actively regulated by the foraminifera and correlated with shell diameters, indicating that the amount of protons removed during calcification is directly related to the volume of calcite precipitated. The here presented findings imply that H+ expulsion as a result of calcification may be a wider strategy for maintaining pH homeostasis in unicellular calcifying organisms.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; EPOCA; European Project on Ocean Acidification; Mediterranean Sea Acidification in a Changing Climate; MedSeA
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 6
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    PANGAEA
    In:  Supplement to: Keul, Nina; Langer, Gerald; de Nooijer, Lennart Jan; Bijma, Jelle (2013): Effect of ocean acidification on the benthic foraminifera Ammonia sp. is caused by a decrease in carbonate ion concentration. Biogeosciences, 10(10), 6185-6198, https://doi.org/10.5194/bg-10-6185-2013
    Publication Date: 2024-03-15
    Description: About 30% of the anthropogenically released CO2 is taken up by the oceans; such uptake causes surface ocean pH to decrease and is commonly referred to as ocean acidification (OA). Foraminifera are one of the most abundant groups of marine calcifiers, estimated to precipitate ca. 50 % of biogenic calcium carbonate in the open oceans. We have compiled the state of the art literature on OA effects on foraminifera, because the majority of OA research on this group was published within the last three years. Disparate responses of this important group of marine calcifiers to OA were reported, highlighting the importance of a process-based understanding of OA effects on foraminifera. We cultured the benthic foraminifer Ammonia sp. under a range of carbonate chemistry manipulation treatments to identify the parameter of the carbonate system causing the observed effects. This parameter identification is the first step towards a process-based understanding. We argue that CO3 is the parameter affecting foraminiferal size-normalized weights (SNWs) and growth rates. Based on the presented data, we can confirm the strong potential of Ammonia sp. foraminiferal SNW as a CO3 proxy.
    Keywords: Alkalinity, total; Ammonia sp.; Ammonia sp., growth rate per individual; Ammonia sp., size; Ammonia sp., weight; Ammonia sp., weight, size normalized; Aragonite saturation state; Benthos; Bicarbonate ion; BIOACID; Biological Impacts of Ocean Acidification; Biological sample; BIOS; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated, see reference(s); Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Coast and continental shelf; Conductivity and pH meter, pH/Cond 340i (WTW, Weilheim); EPOCA; European Project on Ocean Acidification; Foraminifera; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Heterotrophic prokaryotes; Identification; Keul-2011-Ammonia; Laboratory experiment; Mediterranean Sea Acidification in a Changing Climate; MedSeA; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Photometrically using autoanalyzer QUAATRO; Salinity; Single species; Stereomicroscopy (Zeiss Stemi SV 11); Temperate; Temperature, water; Time in days; Ultra-Microbalance (Mettler Toledo UMX 2); Wadden Sea
    Type: Dataset
    Format: text/tab-separated-values, 4897 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Keul, Nina; Langer, Gerald; de Nooijer, Lennart Jan; Nehrke, Gernot; Reichart, Gert-Jan; Bijma, Jelle (2013): Incorporation of uranium in benthic foraminiferal calcite reflects seawater carbonate ion concentration. Geochemistry, Geophysics, Geosystems, 14(1), 102-111, https://doi.org/10.1029/2012GC004330
    Publication Date: 2024-03-15
    Description: The chemical and isotopic composition of foraminiferal shells (so-called proxies) reflects the physico-chemical properties of the seawater. In current day paleoclimate research, the reconstruction of past seawater carbonate system to infer atmospheric CO2 concentrations is one of the most pressing challenges and a variety of proxies have been investigated, such as foraminiferal U/Ca. Since in natural seawater and traditional CO2 perturbation experiments, the carbonate system parameters co-vary, it is not possible to determine the parameter of the carbonate system causing e.g. changes in U/Ca, complicating the use of the latter as a carbonate system proxy. We overcome this problem, by culturing the benthic foraminifer Ammonia sp. at a range of carbonate chemistry manipulation treatments. Shell U/Ca values were determined to test sensitivity of U incorporation to various parameters of the carbonate system. We argue that CO3 is the parameter affecting the U/Ca ratio and consequently, the partitioning coefficient for U in Ammonia sp DU. We can confirm the strong potential of foraminiferal U/Ca as a CO3 proxy.
    Keywords: Alkalinity, total; Ammonia sp.; Aragonite saturation state; Benthos; Bicarbonate ion; BIOACID; Biological Impacts of Ocean Acidification; Biological sample; Biomass/Abundance/Elemental composition; BIOS; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated, see reference(s); Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Coast and continental shelf; Coefficient; Conductivity and pH meter, pH/Cond 340i (WTW, Weilheim); EPOCA; European Project on Ocean Acidification; Experimental treatment; Foraminifera; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Heterotrophic prokaryotes; Keul-2011-Ammonia; Laboratory experiment; Mediterranean Sea Acidification in a Changing Climate; MedSeA; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Photometrically using autoanalyzer QUAATRO; Salinity; Single species; Temperate; Temperature, water; Uranium/Calcium ratio; Wadden Sea
    Type: Dataset
    Format: text/tab-separated-values, 184 data points
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  • 8
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
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