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Datasets of project "Biological Impacts of Ocean Acidification"

Mostrando recursos 1 - 20 de 174

  1. Adaptation of a globally important coccolithophore to ocean warming and acidification

    Schlüter, Lothar; Lohbeck, Kai T; Gutowska, Magdalena A; Gröger, Joachim P; Riebesell, Ulf; Reusch, Thorsten B H

  2. (Supplement) Carbon, nitrogen and phosphorus content and fixation rate of the experimental carbonate system during time

    Wannicke, Nicola; Liskow, Iris; Unger, Juliane

  3. Seagrass biofilm communities at a naturally CO2-rich vent at Papua New Guinea

    Hassenrück, Christiane; Hofmann, Laurie C; Bischof, Kai; Ramette, Alban
    Seagrass meadows are a crucial component of tropical marine reef ecosystems. The seagrass plants are colonized by a multitude of epiphytic organisms that contribute to determining the ecological role of seagrasses. To better understand how environmental changes like ocean acidification might affect epiphytic assemblages, the microbial community composition of the epiphytic biofilm of Enhalus acroides was investigated at a natural CO2 vent in Papua New Guinea using molecular fingerprinting and next generation sequencing of 16S and 18S rRNA genes. Both bacterial and eukaryotic epiphytes formed distinct communities at the CO2-impacted site compared to the control site. This site-related CO2 effect...

  4. Fingerprinting (ARISA: Automated Ribosomal Intergenic Spacer Analysis) data of eukaryotic epiphytes at a naturally CO2-rich vent

    Hassenrück, Christiane

  5. Fingerprinting (ARISA: Automated Ribosomal Intergenic Spacer Analysis) data of bacterial epiphytes at a naturally CO2-rich vent

    Hassenrück, Christiane

  6. Environmental data of Experiment Seagrass biofilm communities at a naturally CO2-rich vent

    Hassenrück, Christiane

  7. Experiment: Adaptation of a globally important coccolithophore to ocean warming and acidification

    Schlüter, Lothar; Lohbeck, Kai T; Gutowska, Magdalena A; Gröger, Joachim P; Riebesell, Ulf; Reusch, Thorsten B H
    Although oceanwarming and acidification are recognized as two major anthropogenic perturbations of today's oceanswe know very little about how marine phytoplankton may respond via evolutionary change.We tested for adaptation to ocean warming in combination with ocean acidification in the globally important phytoplankton species Emiliania huxleyi. Temperature adaptation occurred independently of ocean acidifcation levels. Exponential growth rates were were up to 16% higher in populations adapted for one year to warming when assayed at their upper thermal tolerance limit. Particulate inorganic (PIC) and organic (POC) carbon production was restored to values under present-day ocean conditions, owing to adaptive evolution, and were...

  8. Adaptation of a globally important coccolithophore to ocean warming and acidification: time series

    Schlüter, Lothar

  9. Adaptation of a globally important coccolithophore to ocean warming and acidification: Assay data

    Schlüter, Lothar

  10. Calcification of the Arctic coralline red algae Lithothamnion glaciale in response to elevated CO2

    Büdenbender, Jan; Riebesell, Ulf; Form, Armin
    Rising atmospheric CO2 concentrations could cause a calcium carbonate subsaturation of Arctic surface waters in the next 20 yr, making these waters corrosive for calcareous organisms. It is presently unknown what effects this will have on Arctic calcifying organisms and the ecosystems of which they are integral components. So far, acidification effects on crustose coralline red algae (CCA) have only been studied in tropical and Mediterranean species. In this work, we investigated calcification rates of the CCA Lithothamnion glaciale collected in northwest Svalbard in laboratory experiments under future atmospheric CO2 concentrations. The algae were exposed to simulated Arctic summer and...

  11. Ocean acidification alleviates low-temperature effects on growth and photosynthesis of the red alga Neosiphonia harveyi (Rhodophyta)

    Olischläger, Mark; Wiencke, Christian
    This study aimed to examine interactive effects between ocean acidification and temperature on the photosynthetic and growth performance of Neosiphonia harveyi. N. harveyi was cultivated at 10 and 17.5 °C at present (~380 µatm), expected future (~800 µatm), and high (~1500 µatm) pCO2. Chlorophyll a fluorescence, net photosynthesis, and growth were measured. The state of the carbon-concentrating mechanism (CCM) was examined by pH-drift experiments (with algae cultivated at 10 °C only) using ethoxyzolamide, an inhibitor of external and internal carbonic anhydrases (exCA and intCA, respectively). Furthermore, the inhibitory effect of acetazolamide (an inhibitor of exCA) and Tris (an inhibitor of...

  12. Performance of the Arctic calanoid copepods Calanus glacialis and C. hyperboreus under elevated pCO2 and temperatures

    Hildebrandt, Nicole; Niehoff, Barbara; Sartoris, Franz-Josef
    The sensitivity of copepods to ocean acidification (OA) and warming may increase with time, however, studies >10 days and on synergistic effects are rare. We therefore incubated late copepodites and females of two dominant Arctic species, Calanus glacialis and Calanus hyperboreus, at 0 °C at 390 and 3000 µatm pCO2 for several months in fall/winter 2010. Respiration rates, body mass and mortality in both species and life stages did not change with pCO2. To detect synergistic effects, in 2011 C. hyperboreus females were kept at different pCO2 and temperatures (0, 5, 10 °C). Incubation at 10 °C induced sublethal stress,...

  13. Seawater carbonate chemistry and mantle gene expression patterns of the Baltic Sea blue mussel in a laboratory experiment

    Hüning, Anne K; Melzner, Frank; Thomsen, Jörn; Gutowska, Magdalena A; Krämer, Lars; Kohno, Mika; Rosenstiel, Philip; Pörtner, Hans-Otto; Philipp, Eva E R; Lucassen, Magnus

  14. Model results of sensitivity experiments for marine nitrogen cycle in four NetCDF files

    Landolfi, Angela; Dietze, Heiner; Koeve, Wolfgang; Oschlies, Andreas
    The marine nitrogen (N) inventory is thought to be stabilized by negative feedback mechanisms that reduce N inventory excursions relative to the more slowly overturning phosphorus inventory. Using a global biogeochemical ocean circulation model we show that negative feedbacks stabilizing the N inventory cannot persist if a close spatial association of N2 fixation and denitrification occurs. In our idealized model experiments, nitrogen deficient waters, generated by denitrification, stimulate local N2 fixation activity. But, because of stoichiometric constraints, the denitrification of newly fixed nitrogen leads to a net loss of N. This can enhance the N deficit, thereby triggering additional fixation...

  15. Disentangling the biological and environmental control of M. edulis shell chemistry

    Heinemann, Agnes; Hiebenthal, C; Fietzke, Jan; Eisenhauer, Anton; Wahl, Martin
    Blue mussel individuals (Mytilus edulis) were cultured at four different salinities (17, 20, 29, and 34). During the course of the experiment, temperature was gradually increased from 6°C to 14°C. Mg/Ca and Sr/Ca ratios of the shell calcite portions produced during the 9 weeks of experimental treatment as well parts that were precipitated before the treatment phase were measured by laser ablation-multicollector-inductively coupled plasma-mass spectrometry. Mg/Ca ratios show a positive correlation with temperature for individuals cultured at salinity 29 and 34 (Mg/Ca (mmol/mol) (0.2-0.3)*T (°C)), while for individuals cultured at low salinities (17, 20) no trend was observed. Sr/Ca ratios...

  16. Experiment: Disentangling the biological and environmental control of M. edulis shell chemistry: acid bases

    Heinemann, Agnes

  17. Experiment: Disentangling the biological and environmental control of M. edulis shell chemistry: acid bases (water)

    Heinemann, Agnes

  18. Experiment: Disentangling the biological and environmental control of M. edulis shell chemistry: Boron isotopes

    Heinemann, Agnes

  19. Experiment: Disentangling the biological and environmental control of M. edulis shell chemistry: element ratios

    Heinemann, Agnes

  20. Experiment: Acidified seawater impacts sea urchin larvae pH regulatory systems relevant for calcification

    Stumpp, Meike; Hu, Marian Y; Melzner, Frank; Gutowska, Magdalena A; Dorey, Narimane; Himmerkus, Nina; Holtmann, Wiebke C; Dupont, Sam; Thorndyke, Mike; Bleich, Markus
    Calcifying echinoid larvae respond to changes in seawater carbonate chemistry with reduced growth and developmental delay. To date, no information exists on how ocean acidification acts on pH homeostasis in echinoderm larvae. Understanding acid-base regulatory capacities is important because intracellular formation and maintenance of the calcium carbonate skeleton is dependent on pH homeostasis. Using H(+)-selective microelectrodes and the pH-sensitive fluorescent dye BCECF, we conducted in vivo measurements of extracellular and intracellular pH (pH(e) and pH(i)) in echinoderm larvae. We exposed pluteus larvae to a range of seawater CO(2) conditions and demonstrated that the extracellular compartment surrounding the calcifying primary mesenchyme...

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