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  • 1
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    Effects of ocean acidification on Posidonia oceanica epiphytic community and shoot productivity (2015)
    PANGAEA
    In:  Supplement to: Cox, T Erin; Schenone, Stefano; Delille, Jeremy; Díaz-Castañeda, Victoria; Alliouane, Samir; Gattuso, Jean-Pierre; Gazeau, Frédéric (2015): Effects of ocean acidification on Posidonia oceanica epiphytic community and shoot productivity. Journal of Ecology, 103(6), 1594-1609, https://doi.org/10.1111/1365-2745.12477
    Details
    Publication Date: 2024-03-15
    Description: 1. Biological interactions can alter predictions that are based on single-species physiological response. It is known that leaf segments of the seagrass Posidonia oceanica will increase photosynthesis with lowered pH, but it is not clear whether the outcome will be altered when the whole plant and its epiphyte community, with different respiratory and photosynthetic demands, are included. In addition, the effects on the Posidonia epiphyte community have rarely been tested under controlled conditions, at near-future pH levels. 2. In order to better evaluate the effects of pH levels as projected for the upcoming decades on seagrass meadows, shoots of P. oceanica with their associated epiphytes were exposed in the laboratory to three pH levels (ambient: 8.1, 7.7 and 7.3, on the total scale) for 4 weeks. Net productivity, respiration, net calcification and leaf fluorescence were measured on several occasions. At the end of the study, epiphyte community abundance and composition, calcareous mass and crustose coralline algae growth were determined. Finally, photosynthesis vs. irradiance curves (PE) was produced from segments of secondary leaves cleaned of epiphytes and pigments extracted. 3. Posidonia leaf fluorescence and chlorophyll concentrations did not differ between pH treatments. Net productivity of entire shoots and epiphyte-free secondary leaves increased significantly at the lowest pH level yet limited or no stimulation in productivity was observed at the intermediate pH treatment. Under both pH treatments, significant decreases in epiphytic cover were observed, mostly due to the reduction of crustose coralline algae. The loss of the dominant epiphyte producer yet similar photosynthetic response for epiphyte-free secondary leaves and shoots suggests a minimal contribution of epiphytes to shoot productivity under experimental conditions. 4. Synthesis. Observed responses indicate that under future ocean acidification conditions foreseen in the next century an increase in Posidonia productivity is not likely despite the partial loss of epiphytic coralline algae which are competitors for light. A decline in epiphytic cover could, however, reduce the feeding capacity of the meadow for invertebrates. In situ long-term experiments that consider both acidification and warming scenarios are needed to improve ecosystem-level predictions.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Community composition and diversity; Counts; Counts, standard deviation; Coverage; Description; Effective quantum yield; Effective quantum yield, standard error; Electron transport rate, relative; Electron transport rate, relative, standard error; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Group; Infrared gas analyzer; Irradiance; Irradiance, standard error; Laboratory experiment; Leaf net production, oxygen; Leaf net production, oxygen, standard error; Light saturation point; Light saturation point, standard error; Macroalgae; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard error; Maximum potential capacity of photosynthesis, oxygen; Maximum potential capacity of photosynthesis, oxygen , standard error; Mediterranean Sea; Net calcification rate of calcium carbonate; Net calcification rate of calcium carbonate, standard error; Net primary production of oxygen; Net primary production of oxygen, standard error; 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); pH; pH, standard deviation; Photosynthetic quantum efficiency; Photosynthetic quantum efficiency, standard error; Plantae; Posidonia oceanica; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Ratio; Registration number of species; Replicates; Respiration; Respiration rate, oxygen; Respiration rate, oxygen, standard error; Salinity; Saturation light intensity; Saturation light intensity, standard error; Single species; Species; Taxon/taxa; Temperate; Temperature, water; Temperature, water, standard deviation; Time point, descriptive; Tracheophyta; Treatment; Type; Uniform resource locator/link to reference; Villefranche_OA
    Type: Dataset
    Format: text/tab-separated-values, 13278 data points
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  • 2
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    Seawater carbonate chemistry and Posidonia oceanica epiphytic community composition and mineralogy (2017)
    PANGAEA
    In:  Supplement to: Cox, T Erin; Nash, Merinda C; Gazeau, Frédéric; Deniel, M; Legrand, Erwann; Alliouane, Samir; Mahacek, Paul; Le Fur, Arnaud; Gattuso, Jean-Pierre; Martin, Sophie (2017): Effects of in situ CO2 enrichment on Posidonia oceanica epiphytic community composition and mineralogy. Marine Biology, 164(5), https://doi.org/10.1007/s00227-017-3136-7
    Details
    Publication Date: 2024-03-15
    Description: Alterations in seagrass epiphytic communities are expected under future ocean acidification conditions, yet this hypothesis has been little tested in situ. A Free Ocean Carbon Dioxide Enrichment system was used to lower pH by a ~0.3 unit offset within a partially enclosed portion (1.7 m3) of a Posidonia oceanica meadow (11 m depth) between June 21 and November 3, 2014. Leaf epiphytic community composition (% cover) and bulk epiphytic mineralogy were compared every 4 weeks within three treatments, located in the same meadow: a pH-manipulated (experimental enclosure) and a control enclosure, as well as a nearby ambient area. Percent coverage of invertebrate calcifiers and crustose coralline algae (CCA) did not appear to be affected by the lowered pH. Furthermore, fleshy algae did not proliferate at lowered pH. Only Foraminifera, which covered less than 3% of leaf surfaces, declined in manner consistent with ocean acidification predictions. Bulk epiphytic magnesium carbonate composition was similar between treatments and percentage of magnesium appeared to increase from summer to autumn. CCA did not exhibit any visible skeleton dissolution or mineral alteration at lowered pH and carbonate saturation state. Negative impacts from ocean acidification on P. oceanica epiphytic communities were smaller than expected. Epiphytic calcifiers were possibly protected from the pH treatment due to host plant photosynthesis inside the enclosure where water flow is slowed. The more positive outcome than expected suggests that calcareous members of epiphytic communities may find refuge in some conditions and be resilient to environmentally relevant changes in carbonate chemistry.
    Keywords: Alkalinity, total; Aragonite; Aragonite saturation state; Asymmetry; Benthos; Bicarbonate ion; Calcite saturation state; Calcium carbonate mass; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Community composition and diversity; Coverage; Entire community; EXP; Experiment; Field experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Magnesium carbonate, magnesite; Mediterranean Sea; Mesocosm or benthocosm; OA-ICC; Ocean Acidification International Coordination Centre; Other studied parameter or process; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard deviation; Salinity; Salinity, standard deviation; Soft-bottom community; Temperate; Temperature, water; Temperature, water, standard deviation; Time point, descriptive; Treatment; Type; Villefranche_eFOCE
    Type: Dataset
    Format: text/tab-separated-values, 11028 data points
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  • 3
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    Effects of in situ CO2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica (2016)
    PANGAEA
    In:  Supplement to: Cox, T Erin; Gazeau, Frédéric; Alliouane, Samir; Hendriks, Iris; Mahacek, Paul; Le Fur, Arnaud; Gattuso, Jean-Pierre (2016): Effects of in situ CO2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica. Biogeosciences, 13(7), 2179-2194, https://doi.org/10.5194/bg-13-2179-2016
    Details
    Publication Date: 2024-03-15
    Description: Seagrass is expected to benefit from increased carbon availability under future ocean acidification. This hypothesis has been little tested by in situ manipulation. To test for ocean acidification effects on seagrass meadows under controlled CO2/pH conditions, we used a Free Ocean Carbon Dioxide Enrichment (FOCE) system which allows for the manipulation of pH as continuous offset from ambient. It was deployed in a Posidonia oceanica meadow at 11 m depth in the Northwestern Mediterranean Sea. It consisted of two benthic enclosures, an experimental and a control unit both 1.7 m**3, and an additional reference plot in the ambient environment (2 m**2) to account for structural artifacts. The meadow was monitored from April to November 2014. The pH of the experimental enclosure was lowered by 0.26 pH units for the second half of the 8-month study. The greatest magnitude of change in P. oceanica leaf biometrics, photosynthesis, and leaf growth accompanied seasonal changes recorded in the environment and values were similar between the two enclosures. Leaf thickness may change in response to lower pH but this requires further testing. Results are congruent with other short-term and natural studies that have investigated the response of P. oceanica over a wide range of pH. They suggest any benefit from ocean acidification, over the next century (at a pH of 7.7 on the total scale), on Posidonia physiology and growth may be minimal and difficult to detect without increased replication or longer experimental duration. The limited stimulation, which did not surpass any enclosure or seasonal effect, casts doubts on speculations that elevated CO2 would confer resistance to thermal stress and increase the buffering capacity of meadows.
    Keywords: Alkalinity, total; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Biomass, wet mass, standard deviation; Biomass, wet mass per area; Biomass/Abundance/Elemental composition; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Color description; Compensation point; Compensation point, standard deviation; Coverage; Coverage, standard deviation; Date; Electron transport rate, relative; Electron transport rate, relative, standard deviation; EXP; Experiment; Field experiment; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Height; Height, standard deviation; Initial slope of rapid light curve; Initial slope of rapid light curve, standard deviation; Irradiance; Irradiance, standard deviation; Leaf area; Leaf area, standard deviation; Leaf density per shoot; Leaf length; Leaf length, standard deviation; Leaf production; Leaf production, standard deviation; Leaf toughness; Leaf toughness, standard deviation; Light saturation; Light saturation, standard deviation; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Maximum gross photosynthesis rate, oxygen, per chlorophyll a; Maximum gross photosynthesis rate, oxygen, per chlorophyll a, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Median absolute deviation; Mediterranean Sea; Mesocosm or benthocosm; Month; Net oxygen, flux per chlorophyll a; Number; OA-ICC; Ocean Acidification International Coordination Centre; Oxygen; Oxygen, flux, standard deviation; Oxygen, standard deviation; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Peyssonnelia sp.; pH; pH, standard deviation; pH change; Plantae; Plastochrone interval; Plastochrone interval, standard deviation; Posidonia oceanica; Potentiometric titration; Primary production/Photosynthesis; Registration number of species; Respiration; Respiration rate, oxygen, per chlorophyll a; Respiration rate, oxygen, standard deviation; Salinity; Salinity, standard deviation; Sample amount; Seagrass; Shoot density; Shoot density, standard deviation; Single species; Species; Spectrophotometric; Temperate; Temperature, water; Temperature, water, standard deviation; Thickness; Thickness, standard deviation; Time in days; Tracheophyta; Treatment; Type; Uniform resource locator/link to reference; Villefranche_eFOCE
    Type: Dataset
    Format: text/tab-separated-values, 13600 data points
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  • 4
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    Effects of in situ CO2 enrichment on epibiont settlement on artificial substrata within a Posidonia oceanica meadow (2017)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Alterations to colonization or early post-settlement stages may cause the reorganization of communities under future ocean acidification conditions. Yet, this hypothesis has been little tested by in situ pH manipulation. A Free Ocean Carbon Dioxide Enrichment (FOCE) system was used to lower pH by a 0.3 unit offset within a partially enclosed portion (1.7 m**3) of a Posidonia oceanica seagrass meadow (11 m depth) between 21 June and 3 November 2014. Epibiont colonization and early post settlement stages were assessed within the FOCE setup, as part of the larger community-level study, to better understand the outcome for a multispecies assemblage and the ecological processes that result in reported community shifts under altered carbonate chemistry. Two types of artificial collectors (tiles and scourers) were placed within three treatments: a pH-manipulated enclosure, an un-manipulated control enclosure, and an open plot in the ambient meadow. Tiles and scourers were collected after one to four months. Additionally, to see whether the outcome differed for communities in a later successional stage, previously settled scourer-collectors were also placed in the same three treatments. Enclosures acted to reduce settlement and migrant colonization. Scourers deployed for one to four months within the open-plot contained a community assemblage that could be distinguished from the assemblages within the enclosures. However, a comparison of enclosure assemblages on tiles showed evidence of a pH effect. There was lowered coverage of crustose coralline algae and fewer calcareous tube-forming polychaetes (Spirorbis sp. and Spirobranchus sp.) on tiles placed in the pH-manipulated enclosure compared to the un-manipulated enclosure. For assemblages in scourer collectors, shared and common taxa, in all treatments, were invertebrate polychaetes Psamathe fusca, Sphaerosyllis sp., Chrysopetalum sp., arthropods Harpacticoida, and Amphipoda, and the juvenile bivalve Lyonsia sp. Similar organism composition and abundance, as well as taxonomic richness and evenness, were found in scourers from both enclosures. Pre-settled scourers contained greater numbers of individuals and more calcified members, but the assemblage, as well as the growth rate of a juvenile bivalve Lyonsia sp., appeared unaffected by a two-month exposure to lowered pH and calcium carbonate saturation state. Results from this case study support the hypothesis that early stages of specific calcifiers (crustose coralline algae and calcareous tube-forming polychaetes) are sensitive to near future ocean acidification conditions yet suggest that negative effects on sessile micro-invertebrate assemblages will be minimal.
    Keywords: Alkalinity, total; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using seacarb; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Coverage; Coverage, standard deviation; Duration; Entire community; EXP; Experiment; Family; Field experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Identification; Individuals; Individuals, standard deviation; Mediterranean Sea; Mesocosm or benthocosm; OA-ICC; Ocean Acidification International Coordination Centre; Oxygen; Oxygen, standard deviation; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard deviation; Phylum; Potentiometric titration; Proportion; Reproduction; Salinity; Salinity, standard deviation; Soft-bottom community; Spectrophotometric; Taxon/taxa; Temperate; Temperature, water; Temperature, water, standard deviation; Treatment; Type; Villefranche_eFOCE
    Type: Dataset
    Format: text/tab-separated-values, 57947 data points
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  • 5
    Electronic Resource
    Electronic Resource
    Compartmentation and turnover of organic carbon in the Staghorn coral Acropora formosa (1980)
    Springer
    Marine biology 59 (1980), S. 181-187 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four colonies of Acropora formosa were incubate with Na2 14CO3 for separate 2 h periods within a 24 h period, and then returned to the reef from which they were collected. Terminal branches were collected at intervals over the following 5 d and analysed for radioactivity associated with the skeleton and certain organic pools. Colonies incubated at night showed little or no loss of fixed radioactivity during the 5 d on the reef. However, 50–60% of photosynthetically-fixed 14C was lost from the terminal branches during the first 40 h on the reef. This loss of radioactivity probably resulted from release of mucus and dissolved organic carbon from the coral tissues. Most of the loss of photosynthetically-fixed 14C was due to decrease in the radioactivity of lipids (80% of the total 14C loss) and methanol-water soluble compounds. Determination of any sequencing in metabolic compartments was made difficult by the rapidity with which 14C dissappeared from most of the metabolic pools measured. 14C was incorporated into the skeleton throughout the 5 d on the reef, although the rate of incorporation was very low in colonies which had been incubated with Na2 14CO3 at night.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396866
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  • 6
    Electronic Resource
    Electronic Resource
    Diversity of Microorganisms Isolated from Amber (1999)
    Springer
    Microbial ecology 38 (1999), S. 58-68 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Claims that organisms can be cultured from amber, if substantiated, would be significant contributions to our understanding of the evolution, tenacity, and potential spread of life. Three reports on the isolation of organisms from amber have been published. Cano and Borucki recently reported the isolation of Bacillus sphaericus and Lambert et al. have described a new species designated Staphylococcus succinus from 25–40 million year old Dominican amber. These characterized organisms were phylogenetically distant from extant relatives and the Staphylococcus sp. sufficiently far removed from other extant staphylococci to be considered a new species. Here we report the culture of bacteria from Dominican and previously untested 120 million year old Israeli (Lebanese lode) amber. Twenty-seven isolates from the amber matrix have been characterized by fatty-acid profiles (FAME) and/or 16S rRNA sequencing. We also performed a terminal restriction fragment pattern (TRF) analysis of the original amber before prolonged culture by consensus primer amplification of the 16S rRNA followed by restriction enzyme digestion of the amplicons. Sample TRFs were consistent with a sparse bacterial assemblage and included at least five of the isolated organisms. Finally, we microscopically mapped the internal topography of an amber slice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002489900153
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  • 7
    Electronic Resource
    Electronic Resource
    Identification of calcium conducting channels in isolated boar sperm plasma membranes
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 161 (1989), S. 162-168 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(89)91575-1
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  • 8
    Electronic Resource
    Electronic Resource
    Linkage mapping of the AML1 gene on human chromosome 21 using a DNA polymorphism in the 3' untranslated region
    Amsterdam : Elsevier
    Genomics 14 (1992), S. 506-507 
    Details
    ISSN: 0888-7543
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0888-7543(05)80253-8
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  • 9
    Electronic Resource
    Electronic Resource
    Cloning and linkage mapping of three polymorphic tetranucleotide (TAAA)"n repeats on human chromosome 21
    Amsterdam : Elsevier
    Genomics 14 (1992), S. 1071-1075 
    Details
    ISSN: 0888-7543
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0888-7543(05)80131-4
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  • 10
    Electronic Resource
    Electronic Resource
    Separation of synthetic cycloalkylated bases, nucleosides and nucleotides by reversed-phase high-performance liquid chromatography
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 430 (1988), S. 309-317 
    Details
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0378-4347(00)83166-7
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