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Datasets of project "European Project on Ocean Acidification"

Mostrando recursos 1 - 20 de 1.100

  1. Impacts of ocean acidification on sediment processes in shallow waters of the arctic ocean

    Gazeau, Frédéric; Van Rijswijk, P; Pozzato, L; Middelburg, Jack J
    Despite the important roles of shallow-water sediments in global biogeochemical cycling, the effects of ocean acidification on sedimentary processes have received relatively little attention. As high-latitude cold waters can absorb more CO2 and usually have a lower buffering capacity than warmer waters, acidification rates in these areas are faster than those in sub-tropical regions. The present study investigates the effects of ocean acidification on sediment composition, processes and sediment-water fluxes in an Arctic coastal system. Undisturbed sediment cores, exempt of large dwelling organisms, were collected, incubated for a period of 14 days, and subject to a gradient of pCO2 covering...

  2. Impacts of ocean acidification on sediment processes in shallow waters of the arctic ocean

    Gazeau, Frédéric; Van Rijswijk, P; Pozzato, L; Middelburg, Jack J
    Despite the important roles of shallow-water sediments in global biogeochemical cycling, the effects of ocean acidification on sedimentary processes have received relatively little attention. As high-latitude cold waters can absorb more CO2 and usually have a lower buffering capacity than warmer waters, acidification rates in these areas are faster than those in sub-tropical regions. The present study investigates the effects of ocean acidification on sediment composition, processes and sediment-water fluxes in an Arctic coastal system. Undisturbed sediment cores, exempt of large dwelling organisms, were collected, incubated for a period of 14 days, and subject to a gradient of pCO2 covering...

  3. Impacts of ocean acidification on sediment processes in shallow waters of the arctic ocean

    Gazeau, Frédéric; Van Rijswijk, P; Pozzato, L; Middelburg, Jack J
    Despite the important roles of shallow-water sediments in global biogeochemical cycling, the effects of ocean acidification on sedimentary processes have received relatively little attention. As high-latitude cold waters can absorb more CO2 and usually have a lower buffering capacity than warmer waters, acidification rates in these areas are faster than those in sub-tropical regions. The present study investigates the effects of ocean acidification on sediment composition, processes and sediment-water fluxes in an Arctic coastal system. Undisturbed sediment cores, exempt of large dwelling organisms, were collected, incubated for a period of 14 days, and subject to a gradient of pCO2 covering...

  4. EPOCA Svalbard 2010 mesocosm experiment: bacterial community structure

    Roy, A S; Gibbons, S M; Schunck, Harald; Owens, S; Caporaso, J G; Sperling, Martin; Banyte, Donata; Romac, Sarah; Bittner, Lucie; Mühling, M; Riebesell, Ulf; LaRoche, Julie; Gilbert, Jack Anthony

  5. EPOCA Svalbard 2010 mesocosm experiment: bacterial community structure

    Roy, A S; Gibbons, S M; Schunck, Harald; Owens, S; Caporaso, J G; Sperling, Martin; Banyte, Donata; Romac, Sarah; Bittner, Lucie; Mühling, M; Riebesell, Ulf; LaRoche, Julie; Gilbert, Jack Anthony

  6. EPOCA Svalbard 2010 mesocosm experiment: bacterial community structure

    Roy, A S; Gibbons, S M; Schunck, Harald; Owens, S; Caporaso, J G; Sperling, Martin; Banyte, Donata; Romac, Sarah; Bittner, Lucie; Mühling, M; Riebesell, Ulf; LaRoche, Julie; Gilbert, Jack Anthony

  7. EPOCA Svalbard 2010 mesocosm experiment: Fatty acid composition

    Leu, Eva; Daase, M; Schulz, Kai Georg; Stuhr, Annegret; Riebesell, Ulf

  8. EPOCA Svalbard 2010 mesocosm experiment: Fatty acid composition

    Leu, Eva; Daase, M; Schulz, Kai Georg; Stuhr, Annegret; Riebesell, Ulf

  9. EPOCA Svalbard 2010 mesocosm experiment: Fatty acid composition

    Leu, Eva; Daase, M; Schulz, Kai Georg; Stuhr, Annegret; Riebesell, Ulf

  10. EPOCA Svalbard 2010 mesocosm experiment: Microzooplankton community composition

    Aberle, Nicole; Schulz, Kai Georg; Stuhr, Annegret; Malzahn, Arne M; Ludwig, Andrea; Riebesell, Ulf

  11. EPOCA Svalbard 2010 mesocosm experiment: Microzooplankton community composition

    Aberle, Nicole; Schulz, Kai Georg; Stuhr, Annegret; Malzahn, Arne M; Ludwig, Andrea; Riebesell, Ulf

  12. EPOCA Svalbard 2010 mesocosm experiment: Microzooplankton community composition

    Aberle, Nicole; Schulz, Kai Georg; Stuhr, Annegret; Malzahn, Arne M; Ludwig, Andrea; Riebesell, Ulf

  13. Seawater carbonate chemistry and physiological responses of three temperate coralline algae in a laboratory experiment

    Noisette, Fanny; Egilsdottir, Hronn; Davoult, Dominique; Martin, Sophie
    Coralline algae are major calcifiers of significant ecological importance in marine habitats but are among the most sensitive calcifying organisms to ocean acidification. The elevated pCO2 effects were examined in three coralline algal species living in contrasting habitats from intertidal to subtidal zones on the north-western coast of Brittany, France: (i) Corallina elongata, a branched alga found in tidal rock pools, (ii) Lithophyllum incrustans, a crustose coralline alga from the low intertidal zone, and (iii) Lithothamnion corallioides (maerl), a free-living form inhabiting the subtidal zone. Metabolic rates were assessed on specimens grown for one month at varying pCO2: 380 (current...

  14. Seawater carbonate chemistry and physiological responses of three temperate coralline algae in a laboratory experiment

    Noisette, Fanny; Egilsdottir, Hronn; Davoult, Dominique; Martin, Sophie
    Coralline algae are major calcifiers of significant ecological importance in marine habitats but are among the most sensitive calcifying organisms to ocean acidification. The elevated pCO2 effects were examined in three coralline algal species living in contrasting habitats from intertidal to subtidal zones on the north-western coast of Brittany, France: (i) Corallina elongata, a branched alga found in tidal rock pools, (ii) Lithophyllum incrustans, a crustose coralline alga from the low intertidal zone, and (iii) Lithothamnion corallioides (maerl), a free-living form inhabiting the subtidal zone. Metabolic rates were assessed on specimens grown for one month at varying pCO2: 380 (current...

  15. Seawater carbonate chemistry and physiological responses of three temperate coralline algae in a laboratory experiment

    Noisette, Fanny; Egilsdottir, Hronn; Davoult, Dominique; Martin, Sophie
    Coralline algae are major calcifiers of significant ecological importance in marine habitats but are among the most sensitive calcifying organisms to ocean acidification. The elevated pCO2 effects were examined in three coralline algal species living in contrasting habitats from intertidal to subtidal zones on the north-western coast of Brittany, France: (i) Corallina elongata, a branched alga found in tidal rock pools, (ii) Lithophyllum incrustans, a crustose coralline alga from the low intertidal zone, and (iii) Lithothamnion corallioides (maerl), a free-living form inhabiting the subtidal zone. Metabolic rates were assessed on specimens grown for one month at varying pCO2: 380 (current...

  16. Seawater carbonate chemistry, calcification, primary production and respiration of a temperate rhodolith Lithothamnion corallioides in a laboratory experiment

    Noisette, Fanny; Duong, Gwendoline; Six, Christophe; Davoult, Dominique; Martin, Sophie
    Coralline algae are considered among the most sensitive species to near future ocean acidification. We tested the effects of elevated pCO2 on the metabolism of the free-living coralline alga Lithothamnion corallioides ("maerl") and the interactions with changes in temperature. Specimens were collected in North Brittany (France) and grown for 3 months at pCO2 of 380 (ambient pCO2), 550, 750, and 1000 µatm (elevated pCO2) and at successive temperatures of 10°C (ambient temperature in winter), 16°C (ambient temperature in summer), and 19°C (ambient temperature in summer +3°C). At each temperature, gross primary production, respiration (oxygen flux), and calcification (alkalinity flux) rates...

  17. Seawater carbonate chemistry, calcification, primary production and respiration of a temperate rhodolith Lithothamnion corallioides in a laboratory experiment

    Noisette, Fanny; Duong, Gwendoline; Six, Christophe; Davoult, Dominique; Martin, Sophie
    Coralline algae are considered among the most sensitive species to near future ocean acidification. We tested the effects of elevated pCO2 on the metabolism of the free-living coralline alga Lithothamnion corallioides ("maerl") and the interactions with changes in temperature. Specimens were collected in North Brittany (France) and grown for 3 months at pCO2 of 380 (ambient pCO2), 550, 750, and 1000 µatm (elevated pCO2) and at successive temperatures of 10°C (ambient temperature in winter), 16°C (ambient temperature in summer), and 19°C (ambient temperature in summer +3°C). At each temperature, gross primary production, respiration (oxygen flux), and calcification (alkalinity flux) rates...

  18. Seawater carbonate chemistry, calcification, primary production and respiration of a temperate rhodolith Lithothamnion corallioides in a laboratory experiment

    Noisette, Fanny; Duong, Gwendoline; Six, Christophe; Davoult, Dominique; Martin, Sophie
    Coralline algae are considered among the most sensitive species to near future ocean acidification. We tested the effects of elevated pCO2 on the metabolism of the free-living coralline alga Lithothamnion corallioides ("maerl") and the interactions with changes in temperature. Specimens were collected in North Brittany (France) and grown for 3 months at pCO2 of 380 (ambient pCO2), 550, 750, and 1000 µatm (elevated pCO2) and at successive temperatures of 10°C (ambient temperature in winter), 16°C (ambient temperature in summer), and 19°C (ambient temperature in summer +3°C). At each temperature, gross primary production, respiration (oxygen flux), and calcification (alkalinity flux) rates...

  19. Experiment: Organic matter exudation by Emiliania huxleyi under simulated future ocean conditions

    Borchard, Corinna; Engel, Anja
    Emiliania huxleyi (strain B 92/11) was exposed to different nutrient supply, CO2 and temperature conditions in phosphorus controlled chemostats to investigate effects on organic carbon exudation and partitioning between the pools of particulate organic carbon (POC) and dissolved organic carbon (DOC). 14C incubation measurements for primary production (PP) and extracellular release (ER) were performed. Chemical analysis included the amount and composition of high molecular weight (>1 kDa) dissolved combined carbohydrates (HMW-dCCHO), particulate combined carbohydrates (pCCHO) and the carbon content of transparent exopolymer particles (TEP-C). Applied CO2 and temperature conditions were 300, 550 and 900 µatm pCO2 at 14 °C, and...

  20. Experiment: Organic matter exudation by Emiliania huxleyi under simulated future ocean conditions

    Borchard, Corinna; Engel, Anja
    Emiliania huxleyi (strain B 92/11) was exposed to different nutrient supply, CO2 and temperature conditions in phosphorus controlled chemostats to investigate effects on organic carbon exudation and partitioning between the pools of particulate organic carbon (POC) and dissolved organic carbon (DOC). 14C incubation measurements for primary production (PP) and extracellular release (ER) were performed. Chemical analysis included the amount and composition of high molecular weight (>1 kDa) dissolved combined carbohydrates (HMW-dCCHO), particulate combined carbohydrates (pCCHO) and the carbon content of transparent exopolymer particles (TEP-C). Applied CO2 and temperature conditions were 300, 550 and 900 µatm pCO2 at 14 °C, and...

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