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  • 1
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    The potential of sedimentary ancient DNA for reconstructing past sea ice evolution (2019)
    In:  EPIC3Nature ISME Journ. Microbial Ecol
    Details
    Publication Date: 2020-05-14
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 2
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    Virus infection of Haptolina ericina and Phaeocystis pouchetii implicates evolutionary conservation of programmed cell death induction in marine haptophyte–virus interactions (2014)
    Oxford University Press
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Plankton Research 36 (2014): 943-955, doi:10.1093/plankt/fbu029.
    Description: The mechanisms by which phytoplankton cope with stressors in the marine environment are neither fully characterized nor understood. As viruses are the most abundant entities in the global ocean and represent a strong top-down regulator of phytoplankton abundance and diversity, we sought to characterize the cellular response of two marine haptophytes to virus infection in order to gain more knowledge about the nature and diversity of microalgal responses to this chronic biotic stressor. We infected laboratory cultures of the haptophytes Haptolina ericina and Phaeocystis pouchetii with CeV-01B or PpV-01B dsDNA viruses, respectively, and assessed the extent to which host cellular responses resemble programmed cell death (PCD) through the activation of diagnostic molecular and biochemical markers. Pronounced DNA fragmentation and activation of cysteine aspartate-specific proteases (caspases) were only detected in virus-infected cultures of these phytoplankton. Inhibition of host caspase activity by addition of the pan-caspase inhibitor z-VAD-fmk did not impair virus production in either host–virus system, differentiating it from the Emiliania huxleyi-Coccolithovirus model of haptophyte–virus interactions. Nonetheless, our findings point to a general conservation of PCD-like activation during virus infection in ecologically diverse haptophytes, with the subtle heterogeneity of cell death biochemical responses possibly exerting differential regulation on phytoplankton abundance and diversity.
    Description: Funding to J.L.R, R.-A.S. and A.L. was provided by the Norwegian Research Council for the “VIPMAP” (nr. 186142) and “HAPTODIV” (nr. 190307) projects, and by the European Research Council Advanced Grant ERC-AG-LS8 “Microbial Network Organisation” (MINOS, project number 250254). J.L.R. received a FRIBIO overseas research fellowship from the Norwegian Research Council. K.D.B. and B.V.M. were supported by funding from the United States National Science Foundation (OCE-1061883).
    Keywords: Caspase ; DNA fragmentation ; IETD ; Phycodnaviridae ; z-VAD-fmk ; Haptophyte
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Format: application/msword
    Format: image/jpeg
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    PAPER (OA)
  • 3
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    Effect of increased pCO2 on bacterial assemblage shifts in response to glucose addition in Fram Strait seawater mesocosms (2012)
    PANGAEA
    In:  Supplement to: Ray, Jessica L; Töpper, Birte; An, Shu; Silyakova, Anna; Spindelböck, Joachim; Thyrhaug, Runar; DuBow, Michael S; Thingstad, Tron Frede; Sandaa, Ruth-Anne (2012): Effect of increased pCO2 on bacterial assemblage shifts in response to glucose addition in Fram Strait seawater mesocosms. FEMS Microbiology Ecology, 82(3), 713-723, https://doi.org/10.1111/j.1574-6941.2012.01443.x
    Details
    Publication Date: 2024-03-15
    Description: Ocean acidification may stimulate primary production through increased availability of inorganic carbon in the photic zone, which may in turn change the biogenic flux of dissolved organic carbon (DOC) and the growth potential of heterotrophic bacteria. To investigate the effects of ocean acidification on marine bacterial assemblages, a two-by-three factorial mescosom experiment was conducted using surface sea water from the East Greenland Current in Fram Strait. Pyrosequencing of the V1-V2 region of bacterial 16S ribosomal RNA genes was used to investigate differences in the endpoint (Day 9) composition of bacterial assemblages in mineral nutrient-replete mesocosms amended with glucose (0 µm, 5.3 µm and 15.9 µm) under ambient (250 µatm) or acidified (400 µatm) partial pressures of CO2 (pCO2). All mesocosms showed low richness and diversity by Chao1 estimator and Shannon index, respectively, with general dominance by Gammaproteobacteria and Flavobacteria. Nonmetric multidimensional scaling analysis and two-way analysis of variance of the Jaccard dissimilarity matrix (97% similarity cut-off) demonstrated that the significant community shift between 0 µm and 15.9 µm glucose addition at 250 µatm pCO2 was eliminated at 400 µatm pCO2. These results suggest that the response potential of marine bacteria to DOC input may be altered under acidified conditions.
    Keywords: Algae abundance; Alkalinity, total; Aragonite saturation state; Arctic; Bacteria, abundance; Bacterial production; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Class; Community composition and diversity; Entire community; EXP; Experiment; Family; Field experiment; Fram_Strait_OA; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gene expression (incl. proteomics); Incubation duration; Mesocosm or benthocosm; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Operational taxonomic unit; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phosphate; Polar; Salinity; Sequence abundance; Sequence coverage; Silicate; Species; Temperature, water; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 112442 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Palynology, biomarkers and droplet digital PCR data from the Late Quaternary of Site GS15-198-38, Greenland Sea (2019)
    PANGAEA
    In:  Supplement to: De Schepper, Stijn; Ray, Jessica L; Skaar, Katrine S; Sadatzki, Henrik; Ijaz, Umer Zeeshan; Stein, Ruediger; Larsen, Aud (2019): The potential of sedimentary ancient DNA for reconstructing past sea ice evolution. The ISME Journal, https://doi.org/10.1038/s41396-019-0457-1
    Details
    Publication Date: 2024-04-27
    Description: At Site GS15-198-38, Greenland Sea, we analysed the surface sample (from a multicore) and eight Late Quaternary samples from a Calypso core. The age model for the Calypso core GS15-198-38CC is based on seven AMS 14C ages down to 345 cm, and a 5-cm resolution N. pachyderma sinistral isotope stratigraphy (1) below that level. We analysed the palynology, generated organic biomarker data (including IP25, sterols) and performed quantitative PCR (droplet digital PCR, ddPCR) of the sympagic dinoflagellate Polarella glacialis.
    Keywords: Arctic Sea Ice and Greenland Ice Sheet Sensitivity; ice2ice
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 5
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    Polarella glacialis droplet digital PCR data from sediment cores from site GS15-198-38 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-27
    Keywords: 58GS20150719; Arctic Sea Ice and Greenland Ice Sheet Sensitivity; CALYPSO; Calypso Corer; Droplet Digital PCR (ddPCR); Event label; G. O. Sars (2003); Gene copies; GS15-198; GS15-198-38-CC; GS15-198-38-MC; ice2ice; MUC; MultiCorer; Sample code/label; Section; Section Bot in meters below surface; Section Top in meters below surface; Wet mass
    Type: Dataset
    Format: text/tab-separated-values, 1072 data points
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    DATA PANGAEA
  • 6
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    Palynology of sediment cores from site GS15-198-38 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-27
    Keywords: 58GS20150719; Acritarcha; Acritarcha, error; Acritarcha, reworked; Acritarcha indeterminata; Acritarcha per unit mass; AGE; Algae, freshwater; Algae, freshwater, error; Arctic Sea Ice and Greenland Ice Sheet Sensitivity; Bitectatodinium tepikiense; Botryococcus; Brigantedinium simplex; Brigantedinium spp.; CALYPSO; Calypso Corer; Counting, palynology; Cymatiosphaera? invaginata; Dinoflagellata: cysts indeterminata; Dinoflagellate cyst; Dinoflagellate cyst, standard error; Dinoflagellate cyst indeterminata; Dinoflagellate cyst per unit mass; Dinoflagellate cyst reworked; Dry mass; Echinidinium spp.; Evenness of species; Event label; G. O. Sars (2003); GS15-198; GS15-198-38-CC; GS15-198-38-MC; Halodinium minor; Halodinium spp.; ice2ice; Impagidinium pallidum; Impagidinium sp.; Islandinium minutum; Laboratory code/label; Leiospheres; Lingulodinium machaerophorum; Lycopodium clavatum; Lycopodium clavatum, standard deviation; Lycopodium clavatum spores per tablet; Lycopodium tablets; Lycopodium tablets charge number; MUC; MultiCorer; Nematosphaeropsis labyrinthus; Nematosphaeropsis rigida; Nematosphaeropsis spp.; Palynomorpha; Palynomorpha, reworked; Palynomorpha, reworked, error; Palynomorpha, reworked per unit sediment mass; Palynomorpha, terrestrial; Palynomorpha, terrestrial, error; Palynomorpha, terrestrial, reworked; Pediastrum; Picea; Pinus; Polarella glacialis; Pollen indeterminata; Protoceratium reticulatum, cysts; Pterospermella spp.; Sample code/label; Section; Section Bot in meters below surface; Section Top in meters below surface; Shannon Diversity Index; Species richness; Spiniferites elongatus; Spiniferites ramosus; Spiniferites spp.; Spores, trilete; Tsuga
    Type: Dataset
    Format: text/tab-separated-values, 385 data points
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    DATA PANGAEA
  • 7
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    Biomarkers of sediment cores from site GS15-198-38 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-27
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Ethylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; 58GS20150719; AGE; Arctic Sea Ice and Greenland Ice Sheet Sensitivity; CALYPSO; Calypso Corer; Carbon, organic, total; Carbon-Sulfur Determinator, ELTRA CS-2000; Diene highly branched isoprenoids, per unit mass total organic carbon; Diene highly branched isoprenoids per unit sediment mass; Event label; G. O. Sars (2003); Gas chromatography - Mass spectrometry (GC-MS); GS15-198; GS15-198-38-CC; GS15-198-38-MC; ice2ice; MUC; MultiCorer; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker Dinosterol IP25 index; Sample code/label; Sampling date; Section; Section Bot in meters below surface; Section Top in meters below surface
    Type: Dataset
    Format: text/tab-separated-values, 214 data points
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    DATA PANGAEA
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