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  • 2020-2024  (9)
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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: 2024-02-07
    Description: Seaweed (macroalgae) has attracted attention globally given its potential for climate change mitigation. A topical and contentious question is: Can seaweeds' contribution to climate change mitigation be enhanced at globally meaningful scales? Here, we provide an overview of the pressing research needs surrounding the potential role of seaweed in climate change mitigation and current scientific consensus via eight key research challenges. There are four categories where seaweed has been suggested to be used for climate change mitigation: 1) protecting and restoring wild seaweed forests with potential climate change mitigation co-benefits; 2) expanding sustainable nearshore seaweed aquaculture with potential climate change mitigation co-benefits; 3) offsetting industrial CO2 emissions using seaweed products for emission abatement; and 4) sinking seaweed into the deep sea to sequester CO2. Uncertainties remain about quantification of the net impact of carbon export from seaweed restoration and seaweed farming sites on atmospheric CO2. Evidence suggests that nearshore seaweed farming contributes to carbon storage in sediments below farm sites, but how scalable is this process? Products from seaweed aquaculture, such as the livestock methane-reducing seaweed Asparagopsis or low carbon food resources show promise for climate change mitigation, yet the carbon footprint and emission abatement potential remains unquantified for most seaweed products. Similarly, purposely cultivating then sinking seaweed biomass in the open ocean raises ecological concerns and the climate change mitigation potential of this concept is poorly constrained. Improving the tracing of seaweed carbon export to ocean sinks is a critical step in seaweed carbon accounting. Despite carbon accounting uncertainties, seaweed provides many other ecosystem services that justify conservation and restoration and the uptake of seaweed aquaculture will contribute to the United Nations Sustainable Development Goals. However, we caution that verified seaweed carbon accounting and associated sustainability thresholds are needed before large-scale investment into climate change mitigation from seaweed projects.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2024-03-15
    Description: Motility plays a critical role in algal survival and reproduction, with implications for aquatic ecosystem stability. However, the effect of elevated CO2 on marine, brackish and freshwater algal motility is unclear. Here we show, using laboratory microscale and field mesoscale experiments, that three typical phytoplankton species had decreased motility with increased CO2. Polar marine Microglena sp., euryhaline Dunaliella salina and freshwater Chlamydomonas reinhardtii were grown under different CO2 concentrations for 5 years. Long-term acclimated Microglena sp. showed substantially decreased photo-responses in all treatments, with a photophobic reaction affecting intracellular calcium concentration. Genes regulating flagellar movement were significantly downregulated (P 〈 0.05), alongside a significant increase in gene expression for flagellar shedding (P 〈 0.05). D. salina and C. reinhardtii showed similar results, suggesting that motility changes are common across flagellated species. As the flagella structure and bending mechanism are conserved from unicellular organisms to vertebrates, these results suggest that increasing surface water CO2 concentrations may affect flagellated cells from algae to fish.
    Keywords: Alkalinity, total; Alkalinity, total, standard error; Aragonite saturation state; Behaviour; Bicarbonate ion; Bicarbonate ion, standard error; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calcium, flux; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard error; Carbonate ion; Carbonate ion, standard error; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard error; Chlamydomonas reinhardtii; Chlorophyta; Daily vertical migration; Dunaliella salina; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gene expression; Gene name; Irradiance; Laboratory experiment; Laboratory strains; Microglena sp.; Move velocity; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Oxygen evolution, per chlorophyll a; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error; Pelagos; Percentage; pH; pH, standard error; Phytoplankton; Plantae; Potentiometric; Potentiometric titration; Registration number of species; Respiration; Salinity; Single species; Species; Temperature, water; Time in days; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 124767 data points
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  • 4
    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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  • 5
    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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  • 6
    Publication Date: 2024-03-15
    Description: The marine picocyanobacterium Synechococcus accounts for a major fraction of the primary production across the global oceans. However, knowledge of the responses of Synechococcus to changing pCO2 and light levels has been scarcely documented. Hence, we grew Synechococcus sp. CB0101 at two CO2 concentrations (ambient CO2 AC:410 μatm; high CO2 HC:1000 μatm) under various light levels between 25 and 800 μmol photons m−2 s−1 for 10–20 generations and found that the growth of Synechococcus strain CB0101 is strongly influenced by light intensity, peaking at 250 μmol m−2 s−1 and thereafter declined at higher light levels. Synechococcus cells showed a range of acclimation in their photophysiological characteristics, including changes in pigment content, optical absorption cross section, and light harvesting efficiency. Elevated pCO2 inhibited the growth of cells at light intensities close to or greater than saturation, with inhibition being greater under high light. Elevated pCO2 also reduced photosynthetic carbon fixation rates under high light but had smaller effects on the decrease in quantum yield and maximum relative electron transport rates observed under increasing light intensity. At the same time, the elevated pCO2 significantly decreased particulate organic carbon (POC) and particulate organic nitrogen (PON), particularly under low light. Ocean acidification, by increasing the inhibitory effects of high light, may affect the growth and competitiveness of Synechococcus in surface waters in the future scenario.
    Keywords: Alkalinity, total; Aragonite saturation state; Bacteria; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon/Nitrogen ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a per cell; Contribution; Cyanobacteria; Effective quantum yield; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Functional absorption cross sections of photosystem II reaction centers; Growth/Morphology; Growth rate; Irradiance; Laboratory experiment; Laboratory strains; Light; Maximal electron transport rate, relative; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Particulate organic nitrogen per cell; Pelagos; pH; Photosynthetic carbon fixation rate, per chlorophyll a; Photosynthetic carbon fixation rate per cell; Photosynthetic quantum efficiency; Phytoplankton; Primary production/Photosynthesis; Ratio; Replicate; Salinity; Single species; Species; Synechococcus sp.; Temperature, water; Treatment; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 1428 data points
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  • 7
    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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  • 8
    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
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  • 9
    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
    Location Call Number Limitation Availability
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