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  • Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, intracellular pool per cell; Carbon, intracellular pool per cell, standard deviation; Carbon-14, organic; Carbon-14, organic, standard deviation; Carbon-14 incorporation per cell; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon dioxide/Bicarbonate uptake ratio; Carbon dioxide/Bicarbonate uptake ratio, standard deviation; Carbon incorporation rate per cell; Cell biovolume; Cell density; Chlorophyll a per cell; Chromista; Emiliania huxleyi; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Haptophyta; Laboratory experiment; Laboratory strains; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phytoplankton; Potentiometric; Potentiometric titration; Ratio; Replicate; Salinity; Single species; Species; Table; Temperature, water; Thalassiosira weissflogii; Time in minutes; Time in seconds; Treatment  (1)
  • Human activities effects  (1)
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  • 1
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    In:  Supplement to: Isensee, Kirsten; Erez, Jonathan; Stoll, Heather M (2014): Detection of a variable intracellular acid-labile carbon pool in Thalassiosira weissflogii(Heterokontophyta) and Emiliania huxleyi (Haptophyta) in response to changes in the seawater carbon system. Physiologia Plantarum, 150(2), 321-338, https://doi.org/10.1111/ppl.12096
    Publikationsdatum: 2024-03-15
    Beschreibung: Accumulation of an intracellular pool of carbon (C(i) pool) is one strategy by which marine algae overcome the low abundance of dissolved CO2 (CO2 (aq) ) in modern seawater. To identify the environmental conditions under which algae accumulate an acid-labile C(i) pool, we applied a (14) C pulse-chase method, used originally in dinoflagellates, to two new classes of algae, coccolithophorids and diatoms. This method measures the carbon accumulation inside the cells without altering the medium carbon chemistry or culture cell density. We found that the diatom Thalassiosira weissflogii [(Grunow) G. Fryxell & Hasle] and a calcifying strain of the coccolithophorid Emiliania huxleyi [(Lohmann) W. W. Hay & H. P. Mohler] develop significant acid-labile C(i) pools. C(i) pools are measureable in cells cultured in media with 2-30 µmol/l CO2 (aq), corresponding to a medium pH of 8.6-7.9. The absolute C(i) pool was greater for the larger celled diatoms. For both algal classes, the C(i) pool became a negligible contributor to photosynthesis once CO2 (aq) exceeded 30 µmol/l. Combining the (14) C pulse-chase method and (14) C disequilibrium method enabled us to assess whether E. huxleyi and T. weissflogii exhibited thresholds for foregoing accumulation of DIC or reduced the reliance on bicarbonate uptake with increasing CO2 (aq) . We showed that the C(i) pool decreases with higher CO2 :HCO3 (-) uptake rates.
    Schlagwort(e): Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, intracellular pool per cell; Carbon, intracellular pool per cell, standard deviation; Carbon-14, organic; Carbon-14, organic, standard deviation; Carbon-14 incorporation per cell; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon dioxide/Bicarbonate uptake ratio; Carbon dioxide/Bicarbonate uptake ratio, standard deviation; Carbon incorporation rate per cell; Cell biovolume; Cell density; Chlorophyll a per cell; Chromista; Emiliania huxleyi; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Haptophyta; Laboratory experiment; Laboratory strains; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phytoplankton; Potentiometric; Potentiometric titration; Ratio; Replicate; Salinity; Single species; Species; Table; Temperature, water; Thalassiosira weissflogii; Time in minutes; Time in seconds; Treatment
    Materialart: Dataset
    Format: text/tab-separated-values, 7443 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2022-09-30
    Beschreibung: This Scientific Summary on Multiple Ocean Stressors for Policy Makers offers a reference for all concerned stakeholders to understand and discuss all types of ocean stressors. This document will help coordinate action to better understand how multiple stressors interact and how the cumulative pressures they cause can be tackled and managed. It is a first step towards increased socio-ecological resilience to multiple ocean stressors (Figure 1). Ecosystem-Based Management (EBM)1 recognizes the complex and interconnected nature of ecosystems, and the integral role of humans in these ecosystems. EBM integrates ecological, social and governmental principles. It considers the tradeoffs and interactions between ocean stakeholders (e.g. fishing, shipping, energy extraction) and their goals, while addressing the reduction of conflicts and the negative cumulative impacts of human activities on ecosystem resilience and sustainability. Thus, EBM is an ideal science-based approach for managing the impacts of cumulative stressors on marine ecosystems. The United Nations Decade of Ocean Science for Sustainable Development (2021–2030; Ocean Decade), which is based on a multi-stakeholder consultative process, identified 10 Ocean Decade Challenges. Challenge 2: Understand the effects of multiple stressors on ocean ecosystems, and develop solutions to monitor, protect, manage and restore ecosystems and their biodiversity under changing environmental, social and climate conditions addresses the overall outcomes of the Decade. In particular, outcomes aimed at a clean, healthy and resilient, safe and predicted, sustainably harvested and productive, and accessible ocean, with open and equitable access to data, information and technology and innovation by 2030. This Scientific Summary for Policy Makers is also a call to action underlining the urgency to understand, model and manage multiple ocean stressors now. We cannot manage what we do not understand, and we cannot be efficient without prioritization of ocean actions appropriate to the place and time.
    Beschreibung: OPENASFA INPUT The complete report should be cited as follows: IOC-UNESCO. 2022. Multiple Ocean Stressors: A Scientific Summary for Policy Makers. P.W. Boyd et al. (eds). Paris, UNESCO. 20 pp. (IOC Information Series, 1404) doi:10.25607/OBP-1724
    Beschreibung: Published
    Beschreibung: Refereed
    Schlagwort(e): Oceans ; Marine Ecosystems ; Marine pollution ; Global warming ; Human activities effects ; Environmental monitoring ; Oceanographic Research
    Repository-Name: AquaDocs
    Materialart: Report
    Format: 22pp.
    Standort Signatur Erwartet Verfügbarkeit
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