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  • 2020-2024  (15)
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  • 1
    Online Resource
    Online Resource
    Singapore :Springer,
    Keywords: Environmental chemistry. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (340 pages)
    Edition: 1st ed.
    ISBN: 9789811553547
    DDC: 577.14
    Language: English
    Note: Intro -- Preface -- Contents -- About the Editors -- Part I: Measurement of Environmental Parameters Affecting Marine Plankton Physiology -- Chapter 1: Characteristics of Marine Chemical Environment and the Measurements and Analyses of Seawater Carbonate Chemistry -- 1.1 Dissolved Inorganic Carbon -- 1.2 Total Alkalinity -- 1.3 pH -- 1.4 Seawater Partial Pressure of CO2 -- 1.5 Carbonate Mineral Saturation State -- 1.6 Determination of Seawater Carbonate System Parameters -- Chapter 2: Photosynthetically Active Radiation and Ultraviolet Radiation Measurements -- 2.1 Introduction -- 2.1.1 Light Intensity Measurement -- 2.1.2 Light Absorption and Extinction Coefficient -- 2.1.3 Planer and Spherical Radiometer Calibration -- References -- Part II: Plankton Culture Techniques -- Chapter 3: Manipulation of Seawater Carbonate Chemistry -- 3.1 Changes in the Carbonate Chemistry in Algal Cultures -- 3.2 Perturbation and Controlling of Seawater Carbonate Chemistry Parameters -- 3.2.1 Altering Concentration of Dissolved Inorganic Carbon -- 3.2.1.1 Controlling CO2 Partial Pressures -- 3.2.1.2 Adding CO2 Saturated Sea Water -- 3.2.1.3 Adding Strong Acid and CO32- or/and HCO3- -- 3.2.2 Changing Total Alkalinity -- 3.2.2.1 Adding Strong Acid and Alkali -- 3.2.2.2 Adding CO32- or/and HCO3- -- 3.2.2.3 Controlling Concentration of Ca2+ -- 3.3 Control of Microalgal Cell Density or Biomass -- 3.4 Analyses of Advantages and Disadvantages -- 3.5 Recommendations and Suggestions -- 3.5.1 Filtration and Sterilization -- 3.5.2 Maintain Carbonate Chemistry -- 3.5.3 Effects of Dissolved Organic Matters, Inorganic Nutrients, and Buffers on TA -- 3.5.4 The Treatment of Isotope Inorganic Carbon -- 3.5.5 Determination of Carbonate System Parameters -- 3.5.6 Measurement of pH -- References -- Chapter 4: Microalgae Continuous and Semi-continuous Cultures -- 4.1 Introduction. , 4.2 Microalgal Continuous Culture -- 4.2.1 Turbidostat -- 4.2.2 Chemostat -- 4.3 Microalgal Semicontinuous Culture -- 4.4 The Specific Growth Rates Calculation -- 4.4.1 Batch Culture -- 4.4.2 Semicontinuous Culture -- 4.4.3 Continuous Culture -- 4.5 Relative Merits and Optimization Recommendations -- 4.5.1 Relative Merits of Continuous Culture -- 4.5.2 The Advantages and Disadvantages of Microalgae Semicontinuous Cultures -- 4.5.3 Details in Culture Optimizing -- References -- Chapter 5: Culturing Techniques for Planktonic Copepods -- 5.1 Introduction -- 5.2 Copepod Culturing Methods -- 5.3 Procedures for Copepod Culture -- 5.3.1 Provenance Copepod Collection -- 5.3.2 Copepod Isolation, Purification and Culture -- 5.3.3 Feeding Food -- 5.3.4 Water Quality Control of Culture Medium -- 5.3.5 Harvesting -- 5.4 The Advantages and Disadvantages of Different Culture Methods and Points for Attention -- References -- Part III: Determination of Key Enzymes in Primary Producers -- Chapter 6: Carbonic Anhydrase -- 6.1 Introduction -- 6.2 Immunochemical Quantitative Analysis of Carbonic Anhydrase -- 6.2.1 Preparation of a Protein Sample of Carbonic Anhydrase -- 6.2.2 Separation of Proteins by Electrophoresis (Bailly and Coleman 1988 -- Zhao 2008) -- 6.2.2.1 Sample Treatment -- 6.2.2.2 Loading Sample and Electrophoresis -- 6.2.3 Transfer Proteins to Membrane -- 6.2.4 Blocking -- 6.2.5 Primary Antibody Incubation -- 6.2.6 Secondary Antibody Incubation -- 6.2.7 Protein Detection -- 6.3 Determination of Activity of Carbonic Anhydrase (Willbur and Anderson 1948 -- Xia and Huang 2010) -- 6.3.1 Measurement of Extracellular CA -- 6.3.2 Measurement of Intracellular CA -- 6.3.3 Advantage and Disadvantage -- References -- Chapter 7: Rubisco -- 7.1 Introduction -- 7.2 Experimental Materials and Methods -- 7.2.1 Protein Extraction. , 7.2.1.1 Extraction of Denatured Total Protein -- Materials, Reagents, Instruments and Experimental Methods -- 7.2.1.2 Extraction of Soluble Native Protein -- Materials, Reagents, Instruments, and Experimental Methods -- 7.2.2 Quantification of Rubisco -- 7.2.2.1 Rubisco Quantification Using Immunochemical Methods -- Materials, Reagents, Instruments, and Experimental Methods -- 7.2.2.2 Quantitative Rubisco Using 14C-CABP (2-Carboxy-d-arabinitol-1,5-bisphosphate) -- Materials, Reagents, Instruments, and Experimental Methods -- 7.2.3 Detection of Rubisco Activity -- 7.2.3.1 Detection of Rubisco Enzyme Activity Using NaH14CO3 -- Materials, Reagents, Instruments, and Experimental Methods -- 7.2.3.2 Enzyme-Linked Method of Detection of Rubisco Enzyme Activity -- Materials, Reagents, Instruments, and Experimental Methods -- 7.3 Advantages, Disadvantages, and Misunderstanding -- References -- Chapter 8: Phosphoenolpyruvate Carboxylase -- 8.1 PEPC and C4 Pathway -- 8.2 Preparation and Assay of PEPC -- 8.2.1 Preparation of Reagents -- 8.2.2 Preparation of Cell Extract -- 8.2.3 Procedure -- 8.2.4 14C Isotope Assay Methods -- 8.3 Note -- References -- Chapter 9: Nitrate Reductase -- 9.1 Introduction -- 9.2 Materials and Method -- 9.2.1 Materials -- 9.2.2 Reagent Preparation -- 9.2.3 Methods -- 9.3 Discussion -- References -- Chapter 10: Antioxidants and Reactive Oxygen Species (ROS) Scavenging Enzymes -- 10.1 Introduction -- 10.2 Superoxide Dismutase (SOD) Activity -- 10.2.1 Materials -- 10.2.2 Reagent Preparation -- 10.2.3 Methods -- 10.3 Catalase (CAT) Activity -- 10.3.1 Materials -- 10.3.2 Reagent Preparation -- 10.3.3 Methods -- 10.4 Peroxidase (POD) Activity -- 10.4.1 Materials -- 10.4.2 Reagent Preparation -- 10.4.3 Methods -- 10.5 Ascorbate Peroxidase (APX) Activity -- 10.5.1 Materials -- 10.5.2 Reagent Preparation -- 10.5.3 Methods. , 10.6 Glutathione Reductase (GR) Activity -- 10.6.1 Methods -- 10.7 Discussion -- References -- Part IV: Measurements and Analyses of Pigments -- Chapter 11: Chlorophylls -- 11.1 Distribution, Structure, and Spectral Characteristics of Chlorophylls -- 11.2 Quantitative Analysis of Chlorophyll -- 11.2.1 Spectrophotometry -- 11.2.2 High Performance Liquid Chromatography (HPLC) -- 11.3 The Advantages and Disadvantages of These Methods -- References -- Chapter 12: Phycobiliproteins -- 12.1 Quantitative Analysis of Phycobiliprotein -- 12.2 Isolation and Purification of Phycobiliprotein -- 12.3 Advantages and Disadvantages of Extraction Methods -- References -- Chapter 13: Carotenoids -- 13.1 Distribution of Carotenoids in the Algal Class -- 13.2 Carotenoid Analysis by HPLC -- 13.3 Quantification of Total Carotenoids -- 13.4 Note -- References -- Chapter 14: Phenolic Compounds and Other UV-Absorbing Compounds -- 14.1 Introduction -- 14.2 Determination of Phenolic Compounds -- 14.2.1 Spectrophotometer -- 14.2.2 HPLC -- 14.2.2.1 Preparation of Microalgae Extracts for Isolation and Quantification of Phenolic Compounds -- 14.2.2.2 Solid-Phase Extraction -- 14.2.2.3 Quantification of the Phenolic Compounds -- 14.2.3 Strengths and Limitations -- 14.3 Determination of UV-Absorbing Compounds -- 14.3.1 Extraction of Samples for HPLC Analysis of Mycosporine Amino Acids -- 14.3.2 HPLC Analysis -- References -- Part V: Measurements and Analyses of Photosynthesis and Respiration -- Chapter 15: Photosynthetic Oxygen Evolution -- 15.1 Instruments and Equipment -- 15.2 Solution Preparation -- 15.3 Operation Procedures -- 15.3.1 Installation of the Liquid Oxygen Electrode -- 15.3.2 Calibration of the Liquid Oxygen Electrode -- 15.3.3 Determination of Dissolved Oxygen -- 15.3.4 Calculation of Oxygen Evolution/Oxygen Consumption Rate of Samples. , 15.4 The Advantages, Disadvantages, and Considerations -- References -- Chapter 16: Photosynthetic Carbon Fixation -- 16.1 Introduction -- 16.2 14C Isotope Tracer Method -- 16.2.1 Sampling Protocols -- 16.2.2 14C Inoculation and Incubation -- 16.2.3 14C Collection, Treatment, and Measurement -- 16.3 Matters Needing Attention -- 16.3.1 Volume of Incubation Flask -- 16.3.2 Amount of 14C Addition -- 16.3.3 Incubation Time -- 16.4 Advantages and Disadvantages of the 14C Method -- 16.5 Application of the 14C Method in the Laboratory -- References -- Chapter 17: Photorespiration and Dark Respiration -- 17.1 Introduction -- 17.2 Materials and Methods -- 17.2.1 Algal Materials -- 17.2.2 Instruments -- 17.2.3 Method -- References -- Chapter 18: Carbon Dioxide vs. Bicarbonate Utilisation -- 18.1 Introduction -- 18.2 Methodology -- 18.2.1 Isotope Disequilibria -- 18.2.2 pH Dependence of K0.5 Values -- 18.2.3 Photosynthetic Rates at Different pH Values -- 18.2.3.1 Kinetics of O2 Evolution vs. Uncatalyzed CO2 Supply from HCO3- -- 18.2.3.2 MIMS -- 18.3 Merits and Demerits -- References -- Chapter 19: Action Spectra of Photosynthetic Carbon Fixation -- 19.1 Introduction -- 19.2 Action Spectrum of Visible Light -- 19.2.1 Absorption Spectrum of Pigment -- 19.2.2 Production of Action Spectrum -- 19.3 Biological Weighting Function of UV Radiation -- 19.3.1 Sample Collection -- 19.3.2 Solar Radiation Monitoring -- 19.3.3 Ultraviolet Radiation Treatment -- 19.3.4 Determination of Photosynthetic Carbon Fixation Rate -- 19.3.5 Calculation of BWF -- 19.3.5.1 Photosynthetic Carbon Fixation of Phytoplankton -- 19.3.5.2 UV Intensity Between Filters -- 19.3.5.3 Calculation of Biological Weight -- 19.4 Advantages and Disadvantages -- References -- Chapter 20: Determination of the Inorganic Carbon Affinity and CO2 Concentrating Mechanisms of Algae -- 20.1 Introduction. , 20.2 Determination of Inorganic Carbon Affinity.
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  • 2
    Publication Date: 2024-03-15
    Description: Seawater acidification (SA) has been documented to either inhibit, enhance, or result in no effect on marine primary productivity (PP). In order to examine the effects of SA in changing environments, we investigated the influences of SA (a decrease of 0.4 pHtotal units with corresponding CO2 concentrations in the range of 22.0–39.7 µM) on PP through deck-incubation experiments at 101 stations in the Taiwan Strait and the South China Sea, including the continental shelf and slope, as well as the deep-water basin. The daily primary productivities in surface seawater under incident solar radiation ranged from 17–306 µg C/µg Chl a/d, with the responses of PP to SA being region-dependent and the SA-induced changes varying from −88 % (inhibition) to 57 % (enhancement). The SA treatment stimulated PP in surface waters of coastal, estuarine, and shelf waters but suppressed it in the South China Sea basin. Such SA-induced changes in PP were significantly related to in situ pH and solar radiation in surface seawater but negatively related to salinity changes. Our results indicate that phytoplankton cells are more vulnerable to a pH drop in oligotrophic waters. Contrasting responses of phytoplankton productivity in different areas suggest that SA impacts on marine primary productivity are region-dependent and regulated by local environments.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Change; Chlorophyll a; Coast and continental shelf; Entire community; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Irradiance; Laboratory experiment; LATITUDE; LONGITUDE; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Primary production/Photosynthesis; Primary production of carbon per chlorophyll a; Salinity; Station label; Temperate; Temperature, water; Treatment; Type
    Type: Dataset
    Format: text/tab-separated-values, 6363 data points
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  • 3
    Publication Date: 2024-03-15
    Description: Experimentally elevated pCO2 and the associated pH drop are known to differentially affect many aspects of the physiology of diatoms under different environmental conditions or in different regions. However, contrasting responses to elevated pCO2 in the dark and light periods of a diel cycle have not been documented. By growing the model diatom Phaeodactylum tricornutum under 3 light levels and 2 different CO2 concentrations, we found that the elevated pCO2/pH drop projected for future ocean acidification reduced the diatom's growth rate by 8–25% during the night period but increased it by up to 9–21% in the light period, resulting in insignificant changes in growth over the diel cycle under the three different light levels. The elevated pCO2 increased the respiration rates irrespective of growth light levels and light or dark periods and enhanced its photosynthetic performance during daytime. With prolonged exposure to complete darkness, simulating the sinking process in the dark zones of the ocean, the growth rates decreased faster under elevated pCO2, along with a faster decline in quantum yield and cell size. Our results suggest that elevated pCO2 enhances the diatom's respiratory energy supplies to cope with acidic stress during the night period but enhances its death rate when the cells sink to dark regions of the oceans below the photic zone, with implications for a possible acidification-induced reduction in vertical transport of organic carbon.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carotenoids, standard deviation; Carotenoids/Chlorophyll a ratio; Carotenoids/Chlorophyll a ratio, standard deviation; Carotenoids per cell; Cell, diameter; Cell, diameter, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chromista; Effective photochemical quantum yield; Effective photochemical quantum yield, standard deviation; Electron transport rate, relative; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Laboratory experiment; Laboratory strains; Light; Light mode; Maximum quantum yield of photosystem II; Maximum quantum yield of photosystem II, standard deviation; Net photosynthesis rate, oxygen, per cell; Net photosynthesis rate, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phaeodactylum tricornutum; Phytoplankton; Primary production/Photosynthesis; Ratio; Ratio, standard deviation; Registration number of species; Respiration; Respiration rate, oxygen, per cell; Respiration rate, oxygen, standard deviation; Salinity; Single species; Species; Temperature, water; Time in hours; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 3030 data points
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  • 4
    Publication Date: 2024-03-15
    Description: While intertidal macroalgae are exposed to drastic changes in solar photosynthetically active radiation (PAR) and ultraviolet radiation (UVR) during a diel cycle, and to ocean acidification (OA) associated with increasing CO2 levels, little is known about their photosynthetic performance under the combined influences of these drivers. In this work, we examined the photoprotective strategies controlling electron flow through photosystems II (PSII) and photosystem I (PSI) in response to solar radiation with or without UVR and an elevated CO2 concentration in the intertidal, commercially important, red macroalgae Pyropia (previously Porphyra) yezoensis. By using chlorophyll fluorescence techniques, we found that high levels of PAR alone induced photoinhibition of the inter-photosystem electron transport carriers, as evidenced by the increase of chlorophyll fluorescence in both the J- and I-steps of Kautsky curves. In the presence of UVR, photoinduced inhibition was mainly identified in the O2-evolving complex (OEC) and PSII, as evidenced by a significant increase in the variable fluorescence at the K-step (Fk) of Kautsky curves relative to the amplitude of FJ−Fo (Wk) and a decrease of the maximum quantum yield of PSII (Fv/Fm). Such inhibition appeared to ameliorate the function of downstream electron acceptors, protecting PSI from over-reduction. In turn, the stable PSI activity increased the efficiency of cyclic electron transport (CET) around PSI, dissipating excess energy and supplying ATP for CO2 assimilation. When the algal thalli were grown under increased CO2 and OA conditions, the CET activity became further enhanced, which maintained the OEC stability and thus markedly alleviating the UVR-induced photoinhibition. In conclusion, the well-established coordination between PSII and PSI endows P. yezoensis with a highly efficient photochemical performance in response to UVR, especially under the scenario of future increased CO2 levels and OA.
    Keywords: Activity of cyclic electron transport around Photosystem I; Activity of cyclic electron transport around Photosystem I, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Coast and continental shelf; Effective quantum yield; Effective quantum yield, standard deviation; EXP; Experiment; Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gaogong_Island_OA; Laboratory experiment; Light; Macroalgae; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Oxygen evolving complex activity; Oxygen evolving complex activity, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard deviation; Photochemical quantum yield; Photochemical quantum yield, standard deviation; Photosystem I donor side activity; Photosystem I donor side activity, standard deviation; Photosystem II acceptor side activity; Photosystem II acceptor side activity, standard deviation; Plantae; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Pyropia yezoensis; Quantum yield for reduction of Photosystem I acceptor side; Quantum yield for reduction of Photosystem I acceptor side, standard deviation; Quantum yield of electron transport; Quantum yield of electron transport, standard deviation; Registration number of species; Rhodophyta; Salinity; Single species; Species; Temperate; Temperature, water; Temperature, water, standard deviation; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 276 data points
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  • 5
    Publication Date: 2024-03-15
    Description: The carbonate chemistry in coastal waters is more variable compared with that of open oceans, both in magnitude and time scale of its fluctuations. However, knowledge of the responses of coastal phytoplankton to dynamic changes in pH/pCO2 has been scarcely documented. Hence, we investigated the physiological performance of a coastal isolate of the coccolithophore Emiliania huxleyi (PML B92/11) under fluctuating and stable pCO2 regimes (steady ambient pCO2, 400 μatm; steady elevated pCO2, 1200 μatm; diurnally fluctuating elevated pCO2, 600–1800 μatm). Elevated pCO2 inhibited the calcification rate in both the steady and fluctuating regimes. However, higher specific growth rates and lower ratios of calcification to photosynthesis were detected in the cells grown under diurnally fluctuating elevated pCO2 conditions. The fluctuating pCO2 regime alleviated the negative effects of elevated pCO2 on effective photochemical quantum yield and relative photosynthetic electron transport rate compared with the steady elevated pCO2 treatment. Our results suggest that growth of E. huxleyi could benefit from diel fluctuations of pH/pCO2 under future-projected ocean acidification, but its calcification was reduced by the fluctuation and the increased concentration of CO2, reflecting a necessity to consider the influences of dynamic pH fluctuations on coastal carbon cycles associated with ocean global changes.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate, standard deviation; Calcification rate of carbon per cell; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell size; Cell size, standard deviation; Chromista; Effective photochemical quantum yield; Effective photochemical quantum yield, standard deviation; Electron transport rate, relative; Electron transport rate, relative, standard deviation; Emiliania huxleyi; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Haptophyta; Irradiance; Laboratory experiment; Laboratory strains; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Net photosynthesis rate, per cell; Net photosynthesis rate, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Other; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Photosynthesis rate, carbon, per cell; Phytoplankton; Primary production/Photosynthesis; Registration number of species; Salinity; Single species; Species; Temperature, water; Time in hours; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 2758 data points
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  • 6
    Publication Date: 2024-03-15
    Description: Photophysiological responses of phytoplankton to changing multiple environmental drivers are essential in understanding and predicting ecological consequences of ocean climate changes. In this study, we investigated the combined effects of two CO2 levels (410 and 925 μatm) and five light intensities (80 to 480 μmol photons/m**2/s) on cellular pigments contents, photosynthesis and calcification of the coccolithophore Emiliania huxleyi grown under nutrient replete and limited conditions, respectively. Our results showed that high light intensity, high CO2 level and nitrate limitation acted synergistically to reduce cellular chlorophyll a and carotenoid contents. Nitrate limitation predominantly enhanced calcification rate; phosphate limitation predominantly reduced photosynthetic carbon fixation rate, with larger extent of the reduction under higher levels of CO2 and light. Reduced availability of both nitrate and phosphate under the elevated CO2 concentration decreased saturating light levels for the cells to achieve the maximal relative electron transport rate (rETRmax). Light-saturating levels for rETRmax were lower than that for photosynthetic and calcification rates under the nutrient limitation. Regardless of the culture conditions, rETR under growth light levels correlated linearly and positively with measured photosynthetic and calcification rates. Our findings imply that E. huxleyi cells acclimated to macro-nutrient limitation and elevated CO2 concentration decreased their light requirement to achieve the maximal electron transport, photosynthetic and calcification rates, indicating a photophysiological strategy to cope with CO2 rise/pH drop in shoaled upper mixing layer above the thermocline where the microalgal cells are exposed to increased levels of light and decreased levels of nutrients.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate, standard deviation; Calcification rate/Photosynthesis rate, ratio; Calcification rate/Photosynthesis rate, ratio, standard deviation; Calcification rate of carbon per cell; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carotenoids; Carotenoids/Chlorophyll a ratio; Carotenoids/Chlorophyll a ratio, standard deviation; Carotenoids per cell; Cell density, natural logarithm; Cell density, natural logarithm, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chromista; Effective photochemical quantum yield; Effective photochemical quantum yield, standard deviation; Electron transport rate, relative; Electron transport rate, relative, standard deviation; Emiliania huxleyi; Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Haptophyta; Irradiance; Laboratory experiment; Laboratory strains; Light; Light saturation point; Light saturation point, standard deviation; Light use efficiency; Light use efficiency, standard deviation; Macro-nutrients; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Net photosynthesis rate, per cell; Net photosynthesis rate, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phytoplankton; Primary production/Photosynthesis; Ratio; Ratio, standard deviation; Registration number of species; Salinity; Single species; Species; Temperature, water; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 20746 data points
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  • 7
    Publication Date: 2024-03-15
    Description: The rise of atmospheric pCO2 has created a number of problems for marine ecosystem. In this study, we initially quantified the effects of elevated pCO2 on the group-specific mortality of phytoplankton in a natural community based on the results of mesocosm experiments. Diatoms dominated the phytoplankton community, and the concentration of chlorophyll a was significantly higher in the high-pCO2 treatment than the low-pCO2 treatment. Phytoplankton mortality (percentage of dead cells) decreased during the exponential growth phase. Although the mortality of dinoflagellates did not differ significantly between the two pCO2 treatments, that of diatoms was lower in the high-pCO2 treatment. Small diatoms dominated the diatom community. Although the mortality of large diatoms did not differ significantly between the two treatments, that of small diatoms was lower in the high-pCO2 treatment. These results suggested that elevated pCO2 might enhance dominance by small diatoms and thereby change the community structure of coastal ecosystems.
    Keywords: Abundance; Abundance per volume; Alkalinity, total; Ammonium; Aragonite saturation state; Bicarbonate ion; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell size, standard deviation; Chlorophyll a; Coast and continental shelf; Community composition and diversity; Day of experiment; Entire community; EXP; Experiment; Fucoxanthin; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Identification; Laboratory experiment; Mesocosm or benthocosm; Mortality; Mortality/Survival; Nitrate and Nitrite; Nitrite; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Peridinin; pH; Phosphate; Salinity; Sampling date; Signal; Silicate; Spectrophotometric; Temperate; Temperature, water; Treatment; Type; Wuyuan_Bay_OA
    Type: Dataset
    Format: text/tab-separated-values, 7366 data points
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  • 8
    Publication Date: 2024-03-15
    Description: The commercially important red macroalga Pyropia (formerly Porphyra) yezoensis is, in its natural intertidal environment, subjected to high levels of both photosynthetically active and ultraviolet radiation (PAR and UVR, respectively). In the present work, we investigated the effects of a plausibly increased global CO2 concentration on quantum yields of photosystems II (PSII) and I (PSI), as well as photosynthetic and growth rates of P. yezoensis grown under natural solar irradiance regimes with or without the presence of UV-A and/or UV-B. Our results showed that the high-CO2 treatment (1000 μbar, which also caused a drop of 0.3 pH units in the seawater) significantly increased both CO2 assimilation rates (by 35%) and growth (by 18%), as compared with ambient air of 400 μbar CO2. The inhibition of growth by UV-A (by 26%) was reduced to 15% by high-CO2 concentration, while the inhibition by UV-B remained at ~6% under both CO2 concentrations. Homologous results were also found for the maximal relative photosynthetic electron transport rates (rETRmax), the maximum quantum yield of PSII (Fv/Fm), as well as the midday decrease in effective quantum yield of PSII (YII) and concomitant increased non-photochemical quenching (NPQ). A two-way ANOVA analysis showed an interaction between CO2 concentration and irradiance quality, reflecting that UVR-induced inhibition of both growth and YII were alleviated under the high-CO2 treatment. Contrary to PSII, the effective quantum yield of PSI (YI) showed higher values under high-CO2 condition, and was not significantly affected by the presence of UVR, indicating that it was well protected from this radiation. Both the elevated CO2 concentration and presence of UVR significantly induced UV-absorbing compounds. These results suggest that future increasing CO2 conditions will be beneficial for photosynthesis and growth of P. yezoensis even if UVR should remain at high levels.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carbon dioxide assimilation rate, per area; Carbon dioxide assimilation rate, standard deviation; Coast and continental shelf; Effective quantum yield; Effective quantum yield, standard deviation; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gaogong_Island; Growth/Morphology; Growth rate; Growth rate, standard deviation; Laboratory experiment; Light; Macroalgae; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard deviation; Plantae; Potentiometric titration; Primary production/Photosynthesis; Pyropia yezoensis; Registration number of species; Rhodophyta; Salinity; Single species; Species; Temperate; Temperature, water; Temperature, water, standard deviation; Treatment; Type; Ultraviolet absorbing compounds; Ultraviolet absorbing compounds, standard deviation; Ultraviolet radiation-induced inhibition; Ultraviolet radiation-induced inhibition, standard deviation; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 338 data points
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  • 9
    Publication Date: 2024-03-15
    Description: Diatom responses to ocean acidification have been documented with variable and controversial results. We grew the coastal diatom Thalassiosira weissflogii under 410 (LC, pH 8.13) vs 1000 μatm (HC, pH 7.83) pCO2 and at different levels of light (80, 140, 220 μmol photons/m**2/s), and found that light level alters physiological responses to OA. CO2 concentrating mechanisms (CCMs) were down-regulated in the HC-grown cells across all the light levels, as reflected by lowered activity of the periplasmic carbonic anhydrase and decreased photosynthetic affinity for CO2 or dissolved inorganic carbon. The specific growth rate was, however, enhanced significantly by 9.2% only at the limiting low light level. These results indicate that rather than CO2 “fertilization”, the energy saved from down-regulation of CCMs promoted the growth rate of the diatom when light availability is low, in parallel with enhanced respiration under OA to cope with the acidic stress by providing extra energy.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Calculated using seacarb after Orr et al. (2018); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carotenoids, standard deviation; Carotenoids/Chlorophyll a ratio; Carotenoids/Chlorophyll a ratio, standard deviation; Carotenoids per cell; Cell size; Cell size, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chromista; Effective quantum yield; Effective quantum yield, standard deviation; Electron transport rate, relative; Electron transport rate, relative, standard deviation; Electron transport rate efficiency; Electron transport rate efficiency, standard deviation; Extracellular carbonic anhydrase activity, per cell; Extracellular carbonic anhydrase activity, standard deviation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Fugacity of carbon dioxide in seawater, standard deviation; Growth/Morphology; Growth rate; Growth rate, standard deviation; Laboratory experiment; Laboratory strains; Light; Light saturation point; Light saturation point, standard deviation; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Maximum quantum yield of photosystem II; Maximum quantum yield of photosystem II, standard deviation; Net photosynthesis rate, oxygen, per cell; Net photosynthesis rate, oxygen, per chlorophyll a; Net photosynthesis rate, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Oxygen evolution, daytime; Oxygen evolution, daytime, standard deviation; Oxygen evolution per cell, daytime; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phytoplankton; Primary production/Photosynthesis; Ratio; Ratio, standard deviation; Registration number of species; Respiration; Respiration rate, oxygen, per cell; Respiration rate, oxygen, per chlorophyll a; Respiration rate, oxygen, standard deviation; Salinity; Single species; Species; Temperature, water; Thalassiosira weissflogii; Time in days; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 4428 data points
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  • 10
    Publication Date: 2024-03-15
    Description: While seawater acidification induced by elevated CO2 is known to impact coccolithophores, the effects in combination with decreased salinity caused by sea ice melting and/or hydrological events have not been documented. Here we show the combined effects of seawater acidification and reduced salinity on growth, photosynthesis and calcification of Emiliania huxleyi grown at 2 CO2 concentrations (low CO2 LC:400 μatm; high CO2 HC:1000 μatm) and 3 levels of salinity (25, 30, and 35 per mil). A decrease of salinity from 35 to 25 per mil increased growth rate, cell size and photosynthetic performance under both LC and HC. Calcification rates were relatively insensitive to salinity though they were higher in the LC-grown compared to the HC-grown cells at 25 per mil salinity, with insignificant differences under 30 and 35 per mil. Since salinity and OA treatments did not show interactive effects on calcification, changes in calcification: photosynthesis ratios are attributed to the elevated photosynthetic rates at lower salinities, with higher ratios of calcification to photosynthesis in the cells grown under 35 per mil compared with those grown at 25 per mil. In contrast, photosynthetic carbon fixation increased almost linearly with decreasing salinity, regardless of the pCO2 treatments. When subjected to short-term exposure to high light, the low-salinity-grown cells showed the highest photochemical effective quantum yield with the highest repair rate, though the HC treatment enhanced the PSII damage rate. Our results suggest that, irrespective of pCO2, at low salinity Emiliania huxleyi up-regulates its photosynthetic performance which, despite a relatively insensitive calcification response, may help it better adapt to future ocean global environmental changes, including ocean acidification, especially in the coastal areas of high latitudes.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate, standard deviation; Calcification rate/Photosynthesis rate, ratio; Calcification rate/Photosynthesis rate, ratio, standard deviation; Calcification rate of carbon per cell; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carotenoids, standard deviation; Carotenoids per cell; Cell, diameter; Cell, diameter, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chlorophyll c, standard deviation; Chlorophyll c per cell; Chromista; Effective quantum yield; Effective quantum yield, standard deviation; Emiliania huxleyi; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Haptophyta; Laboratory experiment; Laboratory strains; Maximum quantum yield of photosystem II; Maximum quantum yield of photosystem II, standard deviation; Net photosynthesis rate, per cell; Net photosynthesis rate, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phytoplankton; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Registration number of species; Repair/damage ratio; Repair/damage ratio, standard deviation; Salinity; Single species; Species; Temperature, water; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 456 data points
    Location Call Number Limitation Availability
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