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  • 1
    Online Resource
    Online Resource
    Schlussbericht für das Vorhaben "Zellfreie Biomineralisation am Beispiel von Calciumcarbonat (ZeBiCa2): ein Weg zur in-vitro Synthese von hochstrukturierten Komposit-Materialien" (2018)
    [Bremerhaven] : [Alfred-Wegener-Institut - Helmholtz-Zentrum für Polar- und Meeresforschung]
    Details Availability
    Keywords: Forschungsbericht ; Biomineralisation ; Coccolith ; Calciumcarbonat ; Emiliania huxleyi
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (20 Seiten, 821,30 KB) , Illustrationen
    URL: https://doi.org/10.2314/GBV:1023231786
    DOI: 10.2314/GBV:1023231786
    Language: German
    Note: Förderkennzeichen BMBF 031A158C. - Verbund-Nummer 01134425 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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    GEOMAR CATALOGUE
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  • 2
    Electronic Resource
    Electronic Resource
    Reduced calcification of marine plankton in response to increased atmospheric CO 2 (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 407 (2000), S. 364-367 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The formation of calcareous skeletons by marine planktonic organisms and their subsequent sinking to depth generates a continuous rain of calcium carbonate to the deep ocean and underlying sediments. This is important in regulating marine carbon cycling and ocean–atmosphere ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35030078
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    Paper (German National Licenses)
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  • 3
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    Culture conditions, mass spectrometric measurements and acclimation carbonate chemistry (2016)
    PANGAEA
    In:  Supplement to: Kottmeier, Dorothee; Rokitta, Sebastian D; Rost, Björn (2016): Acidification, not carbonation, is the major regulator of carbon fluxes in the coccolithophore Emiliania huxleyi. New Phytologist, 211(1), 126-137, https://doi.org/10.1111/nph.13885
    Details
    Publication Date: 2023-03-16
    Description: - A combined increase in seawater [CO2] and [H+] was recently shown to induce a shift from photosynthetic HCO3- to CO2 uptake in Emiliania huxleyi. This shift occurred within minutes, whereas acclimation to ocean acidification (OA) did not affect the carbon source. - To identify the driver of this shift, we exposed low- and high-light acclimated E. huxleyi to a matrix of two levels of dissolved inorganic carbon (1400, 2800 lmol kg-1) and pH (8.15, 7.85) and directly measured cellular O2, CO2 and HCO3 fluxes under these conditions. - Exposure to increased [CO2] had little effect on the photosynthetic fluxes, whereas increased [H+] led to a significant decline in HCO3- uptake. Low-light acclimated cells overcompensated for the inhibition of HCO3- uptake by increasing CO2 uptake. High-light acclimated cells, relying on higher proportions of HCO3- uptake, could not increase CO2 uptake and photosynthetic O2 evolution consequently became carbon-limited. - These regulations indicate that OA responses in photosynthesis are caused by [H+] rather than by [CO2]. The impaired HCO3- uptake also provides a mechanistic explanation for lowered calcification under OA. Moreover, it explains the OA-dependent decrease in photosynthesis observed in high-light grown phytoplankton.
    Keywords: AWI_Phytochange; Phytochange @ AWI
    Type: Dataset
    Format: application/zip, 16.7 kBytes
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  • 4
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    Ocean acidification decreases the light-use efficiency in an Antarctic diatom under dynamic but not constant light, link to supplementary data (2015)
    PANGAEA
    In:  Supplement to: Hoppe, Clara Jule Marie; Holtz, Lena-Maria; Trimborn, Scarlett; Rost, Björn (2015): Ocean acidification decreases the light-use efficiency in an Antarctic diatom under dynamic but not constant light. New Phytologist, 207(1), 159-171, https://doi.org/10.1111/nph.13334
    Details
    Publication Date: 2023-04-05
    Description: There is increasing evidence that different light intensities strongly modulate the effects of ocean acidification (OA) on marine phytoplankton. The aim of the present study was to investigate interactive effects of OA and dynamic light, mimicking natural mixing regimes. The Antarctic diatom Chaetoceros debilis was grown under two pCO2 (390 and 1000 latm) and light conditions (constant and dynamic), the latter yielding the same integrated irradiance over the day. To characterize interactive effects between treatments, growth, elemental composition, primary production and photophysiology were investigated. Dynamic light reduced growth and strongly altered the effects of OA on primary production, being unaffected by elevated pCO2 under constant light, yet significantly reduced under dynamic light. Interactive effects between OA and light were also observed for Chl production and particulate organic carbon (POC) quotas. Response patterns can be explained by changes in the cellular energetic balance. While the energy transfer efficiency from photochemistry to biomass production (Phi_e,C) was not affected by OA under constant light, it was drastically reduced under dynamic light. Contrasting responses under different light conditions need to be considered when making predictions regarding a more stratified and acidified future ocean.
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 48.3 kBytes
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  • 5
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    Phosphorus and nitrogen starvation reveal life-cycle specific responses in the metabolome of Emiliania huxleyi (Haptophyta), Supplementary Table 3 (2017)
    PANGAEA
    In:  Supplement to: Wördenweber, Robin; Rokitta, Sebastian D; Heidenreich, Elena; Corona, Katrin; Kirschhöfer, Frank; Fahl, Kirsten; Klocke, Jessica L; Kottke, Tilman; Brenner-Weiß, Gerald; Rost, Björn; Mussgnug, Jan H; Kruse, Olaf (2017): Phosphorus and nitrogen starvation reveal life-cycle specific responses in the metabolome of Emiliania huxleyi (Haptophyta). Limnology and Oceanography, 24 pp, https://doi.org/10.1002/lno.10624
    Details
    Publication Date: 2023-01-13
    Description: The coccolithophore Emiliania huxleyi is a microalga with biogeochemical and biotechnological relevance, due to its high abundance in the ocean and its ability to form intricate calcium carbonate structures. Depletion of macronutrients in oceanic waters is very common and will likely enhance with advancing climate change. We present the first comprehensive metabolome study analyzing the effect of phosphorus (P) and nitrogen (N) starvation on the diploid and haploid life-cycle stage, applying various metabolome analysis methods to gain new insights in intracellular mechanisms to cope with nutrient starvation. P-starvation led to an accumulation of many generic and especially N-rich metabolites, including lipids, osmolytes and pigments. This suggests that P-starvation primarily arrests cell-cycling due to lacking P for nucleic acid synthesis, but that enzymatic functionality is widely preserved. Also, the de-epoxidation ratio of the xanthophyll cycle was upregulated in the diploid stage under P-starvation, indicating increased nonphotochemical quenching, a response typically observed under high light stress. In contrast, N-starvation resulted in a decrease of most central metabolites, also P-containing ones, especially in the diploid stage, indicating that most enzymatic functionality ceased. The two investigated nutrient starvation conditions caused significantly different responses, contrary to previous assumptions derived from transcriptomic studies. Data highlight that instantaneous biochemical flux is a more dominant driver of the metabolome than the transcriptomically rearranged pathway patterns. Due to the fundamental nature of the observed responses it may be speculated that microalgae with similar nutrient requirements can cope better with P-starvation than with N-starvation.
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 118.8 kBytes
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  • 6
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    Resistance of an Arctic phytoplankton assemblages to ocean acidification and high irradiance, link to supplement in MS Excel format (2017)
    PANGAEA
    In:  Supplement to: Hoppe, Clara Jule Marie; Schuback, Nina; Semeniuk, David M; Giesbrecht, Karina E; Mol, Jacoba; Thomas, H; Maldonado, Maria T; Rost, Björn; Varela, Diana E; Tortell, Philippe Daniel (2018): Resistance of Arctic phytoplankton to ocean acidification and enhanced irradiance. Polar Biology, 41(3), 399-413, https://doi.org/10.1007/s00300-017-2186-0
    Details
    Publication Date: 2023-01-13
    Description: The Arctic Ocean is a region particularly prone to on-going ocean acidification (OA) and climate-driven changes. The influence of these changes on Arctic phytoplankton assemblages, however, remains poorly understood. In order to understand how OA and enhanced irradiances (e.g. resulting from sea-ice retreat) will alter the species composition, primary production and ecophysiology of Arctic phytoplankton, we conducted an incubation experiment to investigate the effects of OA and enhanced irradiance levels on an assemblage from Baffin Bay (71°N, 68°W). Seawater was collected from just below the deep Chl a maximum, and the resident phytoplankton were exposed to 380 and 1000 µatm pCO2 at both 15% and 35% incident irradiance. On-deck incubations, in which temperatures were 6°C above in situ conditions, were monitored for phytoplankton growth, biomass stoichiometry, net primary production, photo-physiology and taxonomic composition. During the 8-day experiment, taxonomic diversity decreased and the diatom Chaetoceros socialis became increasingly dominant irrespective of light or CO2 levels. We found no statistically significant effects from either higher CO2 or light on physiological properties of phytoplankton during the experiment. We did, however, observe an initial 2-day stress response in all treatments, and slight photo-physiological responses to higher CO2 and light during the first five days of the incubation. Our results thus indicate high resistance of Arctic phytoplankton to OA and enhanced irradiance levels, challenging the commonly predicted stimulatory effects of enhanced CO2 and light availability for primary production.
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 43.8 kBytes
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  • 7
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    The Arctic picoeukaryote Micromonas pusilla benefits from Ocean Acidification under constant and dynamic light (2019)
    PANGAEA
    In:  Supplement to: White, Emily; Hoppe, Clara Jule Marie; Rost, Björn (2020): The Arctic picoeukaryote Micromonas pusilla benefits from ocean acidification under constant and dynamic light. Biogeosciences, 17(3), 635-647, https://doi.org/10.5194/bg-17-635-2020
    Details
    Publication Date: 2023-01-30
    Description: Compared to the rest of the globe, the Arctic Ocean is affected disproportionately by climate change. Despite these fast environmental changes, we currently know little about the effects of ocean acidification (OA) on marine key species in this area. Moreover, the existing studies typically test the effects of OA under constant, hence artificial light fields. In this study, the abundant Arctic picoeukaryote Micromonas pusilla was acclimated to current (400 μatm) and future (900 μatm) pCO2 levels under a constant as well as dynamic light, simulating more realistic light fields as experienced in the upper mixed layer. To describe and understand the responses to these drivers, growth, particulate organic carbon (POC) production, elemental composition, photophysiology and reactive oxygen species (ROS) production were analysed. M. pusilla was able to benefit from OA on various scales, ranging from an increase in growth rates to enhanced photosynthetic capacity, irrespective of the light regime. These beneficial effects were, however, not reflected in the POC production rates, which can be explained by energy partitioning towards cell division rather than biomass build-up. In the dynamic light regime, M. pusilla was able to optimise its photophysiology for effective light usage during both low and high light periods. This effective photoacclimation, which was achieved by modifications to photosystem II (PSII), imposed high metabolic costs leading to a reduction in growth and POC production rates when compared to constant light. There were no significant interactions observed between dynamic light and OA, indicating that M. pusilla was able maintain effective photoacclimation without increased photoinactivation under high pCO2. Based on these findings, M. pusilla may exhibit a robust positive response to future Arctic Ocean conditions
    Keywords: Arctic Ocean; Dynamic Light; Ocean acidification; photophysiology; Picoeukaryotes; PSII
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    Photophysiological data of the arctic picoeukaryote Micromonas pusilla (2019)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Keywords: Arctic Ocean; Carbon dioxide, partial pressure; Dynamic Light; Effective absorbance cross-section of photosystem II; Electron transport rate, relative, maximum; Fluorescence, hydrogen peroxide; Fluorescence, oxygen free radicals; Index; Light saturation point; Maximum light use efficiency; Non photochemical quenching; Ocean acidification; photophysiology; Photosystem II connectivity; Photosystem II re-opening rate; Picoeukaryotes; PSII; Quantum yield efficiency of photosystem II; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 440 data points
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  • 9
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    Functional redundancy facilitates resilience of subarctic phytoplankton assemblages toward ocean acidification and high irradiance, link to supplement in MS Excel format (2017)
    PANGAEA
    In:  Supplement to: Hoppe, Clara Jule Marie; Schuback, Nina; Semeniuk, David M; Maldonado, Maria T; Rost, Björn (2017): Functional Redundancy Facilitates Resilience of Subarctic Phytoplankton Assemblages toward Ocean Acidification and High Irradiance. Frontiers in Marine Science, 4, 14 pp, https://doi.org/10.3389/fmars.2017.00229
    Details
    Publication Date: 2023-02-24
    Description: In order to understand how ocean acidification (OA) and enhanced irradiance levels might alter phytoplankton eco-physiology, productivity and species composition, we conducted an incubation experiment with a natural plankton assemblage from sub-surface Subarctic waters (Davis Strait, 63°N). The phytoplankton assemblage was exposed to 380 and 1,000 µatm pCO2 at both 15 and 35% surface irradiance over 2 weeks. The incubations were monitored and characterized in terms of their photo-physiology, biomass stoichiometry, primary production and dominant phytoplankton species. We found that the phytoplankton assemblage exhibited pronounced high-light stress in the first days of the experiment (20-30% reduction in photosynthetic efficiency, Fv/Fm). This stress signal was more pronounced when grown under OA and high light, indicating interactive effects of these environmental variables. Primary production in the high light treatments was reduced by 20% under OA compared to ambient pCO2 levels. Over the course of the experiment, the assemblage fully acclimated to the applied treatments, achieving similar bulk characteristics (e.g., net primary production and elemental stoichiometry) under all conditions. We did, however, observe a pCO2-dependent shift in the dominant diatom species, with Pseudonitzschia sp. dominating under low and Fragilariopsis sp. under high pCO2 levels. Our results indicate an unexpectedly high level of resilience of Subarctic phytoplankton to OA and enhanced irradiance levels. The co-occurring shift in dominant species suggests functional redundancy to be an important, but so-far largely overlooked mechanism for resilience toward climate change.
    Keywords: GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 48.6 kBytes
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  • 10
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    Cellular composition of the arctic picoeukaryote Micromonas pusilla (2019)
    PANGAEA
    Details
    Publication Date: 2023-06-19
    Keywords: Arctic Ocean; Carbon dioxide, partial pressure; Dynamic Light; Micromonas pusilla, carbon, organic, particulate per chlorophyll a; Micromonas pusilla, carbon/nitrogen ratio; Micromonas pusilla, chlorophyll a quota per cell; Micromonas pusilla, division rate; Micromonas pusilla, growth rate; Micromonas pusilla, particulate organic carbon production per cell; Micromonas pusilla, particulate organic carbon quota per cell; Micromonas pusilla, particulate organic nitrogen quota per cell; Ocean acidification; photophysiology; Picoeukaryotes; PSII; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 170 data points
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