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  • 1
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    Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community (2013)
    PANGAEA
    In:  Supplement to: Sugie, Koji; Endo, H; Suzuki, Koji; Nishioka, Jun; Kiyosawa, H; Yoshimura, T (2013): Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community. Biogeosciences, 10(10), 6309-6321, https://doi.org/10.5194/bg-10-6309-2013
    Details
    Publication Date: 2024-03-15
    Description: Little is known concerning the effect of CO2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO2 manipulation experiments have been conducted under elements-replete conditions. To investigate the effects of CO2 and iron availability on phytoplankton ecophysiology, we conducted an experiment in September 2009 using a phytoplankton community in the iron limited, high-nutrient, low-chlorophyll (HNLC) region of the Bering Sea basin . Carbonate chemistry was controlled by the bubbling of the several levels of CO2 concentration (180, 380, 600, and 1000 ppm) controlled air, and two iron conditions were established, one with and one without the addition of inorganic iron. We demonstrated that in the iron-limited control conditions, the specific growth rate and the maximum photochemical quantum efficiency (Fv/Fm) of photosystem (PS) II decreased with increasing CO2 levels, suggesting a further decrease in iron bioavailability under the high-CO2 conditions. In addition, biogenic silica to particulate nitrogen and biogenic silica to particulate organic carbon ratios increased from 2.65 to 3.75 and 0.39 to 0.50, respectively, with an increase in the CO2 level in the iron-limited controls. By contrast, the specific growth rate, Fv/Fm values and elemental compositions in the iron-added treatments did not change in response to the CO2 variations, indicating that the addition of iron canceled out the effect of the modulation of iron bioavailability due to the change in carbonate chemistry. Our results suggest that high-CO2 conditions can alter the biogeochemical cycling of nutrients through decreasing iron bioavailability in the iron-limited HNLC regions in the future.
    Keywords: Alkalinity, total; Ammonium; Aragonite saturation state; Bering_Sea_OA; Bicarbonate ion; Biogenic silica; 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, organic, particulate; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Community composition and diversity; Coulometric titration; Day of experiment; Entire community; EXP; Experiment; Fluorescence intensity; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Iron, dissolved; Laboratory experiment; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Micro-nutrients; Nitrate and Nitrite; Nitrogen, total, particulate; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Percentage; pH; Phosphate; Potentiometric titration; Primary production/Photosynthesis; Salinity; Silicate; Species; Temperate; Temperature, water; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 7241 data points
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  • 2
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    Impacts of elevated CO2 on particulate and dissolved organic matter production: microcosm experiments using iron-deficient plankton communities in open subarctic waters (2013)
    PANGAEA
    In:  Supplement to: Yoshimura, T; Suzuki, Koji; Kiyosawa, H; Ono, Tsuneo; Hattori, Hiroshi; Kuma, Kenshi; Nishioka, Jun (2013): Impacts of elevated CO2 on particulate and dissolved organic matter production: microcosm experiments using iron-deficient plankton communities in open subarctic waters. Journal of Oceanography, 69(5), 601-618, https://doi.org/10.1007/s10872-013-0196-2
    Details
    Publication Date: 2024-03-15
    Description: Response of phytoplankton to increasing CO2 in seawater in terms of physiology and ecology is key to predicting changes in marine ecosystems. However, responses of natural plankton communities especially in the open ocean to higher CO2 levels have not been fully examined. We conducted CO2 manipulation experiments in the Bering Sea and the central subarctic Pacific, known as high nutrient and low chlorophyll regions, in summer 2007 to investigate the response of organic matter production in iron-deficient plankton communities to CO2 increases. During the 14-day incubations of surface waters with natural plankton assemblages in microcosms under multiple pCO2 levels, the dynamics of particulate organic carbon (POC) and nitrogen (PN), and dissolved organic carbon (DOC) and phosphorus (DOP) were examined with the plankton community compositions. In the Bering site, net production of POC, PN, and DOP relative to net chlorophyll-a production decreased with increasing pCO2. While net produced POC:PN did not show any CO2-related variations, net produced DOC:DOP increased with increasing pCO2. On the other hand, no apparent trends for these parameters were observed in the Pacific site. The contrasting results observed were probably due to the different plankton community compositions between the two sites, with plankton biomass dominated by large-sized diatoms in the Bering Sea versus ultra-eukaryotes in the Pacific Ocean. We conclude that the quantity and quality of the production of particulate and dissolved organic matter may be altered under future elevated CO2 environments in some iron-deficient ecosystems, while the impacts may be negligible in some systems.
    Keywords: 19-Hexanoyloxyfucoxanthin; Alkalinity, total; Ammonium; Aragonite saturation state; Bacteria; Bering_Sea; 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, organic, dissolved; Carbon, organic, particulate; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Ceratium sp.; Chaetoceros sp.; Chlorophyll a; Community composition and diversity; Coscinodiscus sp.; Coulometric titration; Diatoms; Dinobryon balticum; Entire community; Eukaryotes; Event label; EXP; Experiment; Flow cytometry; Fluorescence determination; Fucoxanthin; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gymnodinium sp.; Haptophytes; High Performance Liquid Chromatography (HPLC); Laboratory experiment; Mesodinium rubrum; Micro-nutrients; Neodenticula seminae; Nitrate and Nitrite; Nitrite; Nitrogen, total, particulate; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Parafavella sp.; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Peridinin; pH; Phosphate; Phosphorus, organic, dissolved; Potentiometric titration; Prorocentrum sp.; Pseudo-nitzschia sp.; Replicate; Rhizosolenia sp.; Salinity; Silicate; Site; Species; Spectrophotometric; subarctic_Pacific; Synechococcus; Temperate; Temperature, water; Thalassiothrix sp.; Time in days; Tropidoneis sp.
    Type: Dataset
    Format: text/tab-separated-values, 6772 data points
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  • 3
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    Sequence and structure analysis of a mirror tRNA located upstream of the cytochrome oxidase I mRNA in mouse mitochondria (2016)
    Oxford University Press
    Details
    Publication Date: 2016-02-24
    Description: RNA fragments corresponding to the mirror tRNA that is located upstream of the cytochrome oxidase I (COXI) gene in the mouse mitochondrial genome were found in the sequences obtained from the mouse brain by the next generation sequencing. RNA fragments corresponding to the 5' terminal of COXI mRNA were also found and it was suggested that the precursor of the COXI mRNA is processed at three residues upstream of the first AUG codon. The mirror tRNA fragment has poly(A) in its 3' terminal and variable 5' terminal, suggesting that this RNA is produced during the 5' processing of COXI mRNA. Secondary structure prediction and NMR analysis indicated that the mirror tRNA is folded into a tRNA-like secondary structure, suggesting that the tRNA-like conformation of the 5' adjacent sequence of COXI mRNA is involved in the COXI mRNA maturation in the mouse mitochondria.
    Print ISSN: 0021-924X
    Electronic ISSN: 1756-2651
    Topics: Biology , Chemistry and Pharmacology
    Published by Oxford University Press on behalf of The Japanese Biochemical Society (JBS).
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  • 4
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    ES cell differentiation system recapitulates the establishment of imprinted gene expression in a cell-type-specific manner (2011)
    Oxford University Press
    Details
    Publication Date: 2011-12-09
    Print ISSN: 0964-6906
    Electronic ISSN: 1460-2083
    Topics: Biology , Medicine
    Published by Oxford University Press
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  • 5
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    Primate origin of the CMT1A-REP repeat and analysis of a putative transposon-associated recombinational hotspot (1996)
    Oxford University Press
    Details
    Publication Date: 1996-06-01
    Print ISSN: 0964-6906
    Electronic ISSN: 1460-2083
    Topics: Biology , Medicine
    Published by Oxford University Press
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  • 6
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    Comparative expression analysis uncovers novel features of endogenous antisense transcription (2008)
    Oxford University Press
    Details
    Publication Date: 2008-02-07
    Print ISSN: 0964-6906
    Electronic ISSN: 1460-2083
    Topics: Biology , Medicine
    Published by Oxford University Press
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  • 7
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    Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community (2013)
    Copernicus
    Details
    Publication Date: 2013-03-06
    Description: Little is known concerning the effect of CO2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most of the CO2 manipulation experiments have been conducted under these element-replete conditions. To investigate the effects of CO2 and iron availability on phytoplankton ecophysiology, we conducted an experiment using a phytoplankton community in the iron-limited, high-nutrient, low-chlorophyll (HNLC) region of the Bering Sea basin in September 2009. Carbonate chemistry was controlled by the bubbling of the several levels of CO2 concentration (180, 380, 600, and 1000 ppm) controlled air, and two iron conditions were established with or without the addition of inorganic iron. We demonstrated that in the iron-limited control conditions, the specific growth rate and the maximum photochemical quantum efficiency (Fv/Fm) of photosystem (PS) II decreased with increasing CO2 levels, suggesting a~further decrease in iron bioavailability under the high CO2 conditions. In addition, biogenic silica to particulate nitrogen and biogenic silica to particulate organic carbon ratios increased from 2.65 to 3.75 and 0.39 to 0.50, respectively with an increase in CO2 level in the iron-limited controls. In contrast, in the iron-added treatments, specific growth rate, Fv/Fm values and elemental compositions did not change in response to the CO2 variations, indicating that the addition of iron cancelled out the effect of the modulation of iron bioavailability due to the change in carbonate chemistry. Our results suggest that high CO2 conditions can alter the biogeochemical cycling of nutrients through decreasing iron bioavailability in the iron-limited HNLC regions in the future.
    Print ISSN: 1810-6277
    Electronic ISSN: 1810-6285
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 8
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    Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community (2013)
    Copernicus
    Details
    Publication Date: 2013-10-07
    Description: Little is known concerning the effect of CO2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO2 manipulation experiments have been conducted under elements-replete conditions. To investigate the effects of CO2 and iron availability on phytoplankton ecophysiology, we conducted an experiment in September 2009 using a phytoplankton community in the iron limited, high-nutrient, low-chlorophyll (HNLC) region of the Bering Sea basin . Carbonate chemistry was controlled by the bubbling of the several levels of CO2 concentration (180, 380, 600, and 1000 ppm) controlled air, and two iron conditions were established, one with and one without the addition of inorganic iron. We demonstrated that in the iron-limited control conditions, the specific growth rate and the maximum photochemical quantum efficiency (Fv/Fm) of photosystem (PS) II decreased with increasing CO2 levels, suggesting a further decrease in iron bioavailability under the high-CO2 conditions. In addition, biogenic silica to particulate nitrogen and biogenic silica to particulate organic carbon ratios increased from 2.65 to 3.75 and 0.39 to 0.50, respectively, with an increase in the CO2 level in the iron-limited controls. By contrast, the specific growth rate, Fv/Fm values and elemental compositions in the iron-added treatments did not change in response to the CO2 variations, indicating that the addition of iron canceled out the effect of the modulation of iron bioavailability due to the change in carbonate chemistry. Our results suggest that high-CO2 conditions can alter the biogeochemical cycling of nutrients through decreasing iron bioavailability in the iron-limited HNLC regions in the future.
    Print ISSN: 1726-4170
    Electronic ISSN: 1726-4189
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 9
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    Impacts of elevated CO2 on phytoplankton community composition and organic carbon dynamics in nutrient-depleted Okhotsk Sea surface waters (2009)
    Copernicus
    Details
    Publication Date: 2009-04-15
    Description: Impacts of the increasing CO2 in seawater (i.e. ocean acidification) on phytoplankton physiology may have various and potentially adverse effects on phytoplankton dynamics and the carbon cycle. We conducted a CO2 manipulation experiment in the Sea of Okhotsk in summer 2006 to investigate the response of the phytoplankton assemblage and dynamics of organic carbon. During the 14-day incubation of nutrient-depleted surface water with a natural phytoplankton assemblage under 150, 280, 480, and 590 μatm pCO2, the relative abundance of fucoxanthin-containing phytoplankton such as diatoms and prymnesiophytes decreased with increasing pCO2. The amount of DOC accumulation also decreased with increasing pCO2, while differences in POC accumulation between the treatments were small and did not show a clear trend with the pCO2. Change in the phytoplankton community composition under different CO2 conditions will alter the organic carbon dynamics as found in the present experiment. Compared to results in the literature from nutrient-replete conditions indicating a potential enhancement of phytoplankton production with elevated CO2, the present results indicated a different physiological response of phytoplankton under nutrient-depleted conditions. These results indicate that the continuing increase in atmospheric CO2 can significantly affect the structure of marine ecosystems and carbon cycle in nutrient-depleted subpolar surface waters.
    Print ISSN: 1810-6277
    Electronic ISSN: 1810-6285
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 10
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    Size and taxonomic plankton community structure and carbon flow at the equator, 175‡E during 1990–1994 (1997)
    Elsevier
    Details
    Publication Date: 1997-01-01
    Print ISSN: 0967-0645
    Electronic ISSN: 1879-0100
    Topics: Biology , Geosciences , Physics
    Published by Elsevier
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