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  • 1
    Online Resource
    Online Resource
    KMU - innovativ Verbundprojekt UvPAA: Ultraschall-Behandlung von Prozesswasser in Aquakultur- und Abwasseranlagen : Schlussbericht : Teilprojekt 2 : Laufzeit 01.09.2018 bis 31.12.2020 (2021)
    [Bremerhaven] : [Alfred Wegener Institut]
    Details Availability
    Keywords: Forschungsbericht ; Brauchwasser ; Abwasseraufbereitung ; Ultraschalltechnik
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (30 Seiten, 1,30 MB) , Illustrationen, Diagramme
    URL: https://doi.org/10.2314/KXP:182129226X
    DOI: 10.2314/KXP:182129226X
    Language: German
    Note: Förderkennzeichen BMBF 02WQ1432B , Verbundnummer 01181211 , Zuwendungsempfänger dem Förderkatalog entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
    Online Resource
    Online Resource
    Maßgeschneiderte biobasierte Inhaltsstoffe - Verbundvorhaben: „Nährstoffreiches und neuroprotektives Algenextrakt (RecAL)“ – Teilprojekt B : Projektlaufzeit: 01.09.2017 bis 31.12.2020 (2020)
    Bremerhaven : [Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung]
    Details Availability
    Keywords: Forschungsbericht ; Nahrungsergänzungsmittel ; Algen ; Neuroprotektivum
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (12 Seiten, 2,48 KB) , Illustrationen, Diagramme
    URL: https://doi.org/10.2314/KXP:1830731610
    DOI: 10.2314/KXP:1830731610
    Language: German
    Note: Förderkennzeichen BMBF 031B0367B , Verbundnummer 01180416
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  • 3
    Online Resource
    Online Resource
    Sondierungsvorhaben im Rahmen des Ideenwettbewerbs "Neue Produkte für die Bioökonomie": BIOBED - Erweiterung des kultivierbaren Algenspektrums um bisher nicht im industriellen Maßstab produzierbare Mikroalgen : Veröffentlichung der Ergebnisse von Forschungsvorhaben im BMBF-Programm : Projektlaufzeit: 01.10.2020 bis 31.01.2022 (2022)
    Bremerhaven : Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (13 Seiten, 1,45 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb23/1860424430.pdf
    URL: https://doi.org/10.2314/KXP:1860424430
    DOI: 10.2314/KXP:1860424430
    Language: German
    Note: Förderkennzeichen BMBF 031B1029 , Literaturverzeichnis: Seite 13 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 4
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    Deep carbon export from a Southern Ocean iron-fertilized diatom bloom (2012)
    Nature Publishing Group
    In:  Nature, 487 (7407). pp. 313-319.
    Details
    Publication Date: 2019-09-23
    Description: Fertilization of the ocean by adding iron compounds has induced diatom-dominated phytoplankton blooms accompanied by considerable carbon dioxide drawdown in the ocean surface layer. However, because the fate of bloom biomass could not be adequately resolved in these experiments, the timescales of carbon sequestration from the atmosphere are uncertain. Here we report the results of a five-week experiment carried out in the closed core of a vertically coherent, mesoscale eddy of the Antarctic Circumpolar Current, during which we tracked sinking particles from the surface to the deep-sea floor. A large diatom bloom peaked in the fourth week after fertilization. This was followed by mass mortality of several diatom species that formed rapidly sinking, mucilaginous aggregates of entangled cells and chains. Taken together, multiple lines of evidence—although each with important uncertainties—lead us to conclude that at least half the bloom biomass sank far below a depth of 1,000 metres and that a substantial portion is likely to have reached the sea floor. Thus, iron-fertilized diatom blooms may sequester carbon for timescales of centuries in ocean bottom water and for longer in the sediments.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
    DOI: 10.1038/nature11229
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Abundance and biomass of protozooplankton from the iron-induced phytoplankton bloom during the EisenEx experiment in 2000 in the Southern Ocean (2006)
    PANGAEA
    In:  Supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Smetacek, Victor (2007): Response of the larger protozooplankton to an iron-induced phytoplankton bloom in the Polar Frontal Zone of the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(5), 774-791, https://doi.org/10.1016/j.dsr.2007.02.005
    Details
    Publication Date: 2023-03-16
    Description: The responses of larger (〉50 µm in diameter) protozooplankton groups to a phytoplankton bloom induced by in situ iron fertilization (EisenEx) in the Polar Frontal Zone (PFZ) of the Southern Ocean in austral spring are presented. During the 21 days of the experiment, samples were collected from seven discrete depths in the upper 150 m inside and outside the fertilized patch for the enumeration of acantharia, foraminifera, radiolaria, heliozoa, tintinnid ciliates and aplastidic thecate dinoflagellates. Inside the patch, acantharian numbers increased twofold, but only negligibly in surrounding waters. This finding is of major interest, since acantharia are suggested to be involved in the formation of barite (BaSO_4 ) found in sediments and which is a palaeoindicator of both ancient and modern high productivity regimes. Foraminifera increased significantly in abundance inside and outside the fertilized patch. However the marked increase of juveniles after a full moon event suggests a lunar periodicity in the reproduction cycle of some foraminiferan species rather than a reproductive response to enhanced food availability. In contrast, adult radiolaria showed no clear trend during the experiment, but juveniles increased threefold indicating elevated reproduction. Aplastidic thecate dinoflagellates almost doubled in numbers and biomass, but also increased outside the patch. Tintinnid numbers decreased twofold, although biomass remained constant due to a shift in the size spectrum. Empty tintinnid loricae, however, increased by a factor of two indicating that grazing pressure on this group mainly by copepods intensified during EisenEx. The results show that iron-fertilization experiments can shed light on the biology and the role of these larger protists in pelagic ecosystem which will improve their use as proxies in palaeoceanography.
    Keywords: ANT-XVIII/2; CTD/Rosette; CTD11; CTD118; CTD121; CTD125; CTD130; CTD146; CTD15; CTD150; CTD19; CTD47; CTD52; CTD55; CTD58; CTD64; CTD67; CTD71; CTD75; CTD88; CTD-RO; EisenEx; European Iron Enrichment Experiment in the Southern Ocean; Polarstern; PS58/009-6; PS58/011-3; PS58/012-4; PS58/014-6; PS58/038-7; PS58/041-5; PS58/042-5; PS58/043-4; PS58/045-9; PS58/046-5; PS58/048-5; PS58/049-5; PS58/061-3; PS58/088-7; PS58/090-2; PS58/091-3; PS58/092-6; PS58/107-6; PS58/108-3; PS58 EISENEX; South Atlantic
    Type: Dataset
    Format: application/zip, 38 datasets
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    DATA PANGAEA
  • 6
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    Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic (2006)
    PANGAEA
    In:  Supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384, https://doi.org/10.1016/j.dsr.2006.12.004
    Details
    Publication Date: 2023-03-16
    Description: The dynamics, composition and grazing impact of microzooplankton were studied during the in situ iron fertilisation experiment EisenEx in the Antarctic Polar Frontal Zone in austral spring (November 2000). During the 21 day experiment, protozooplankton and small metazooplankton were sampled from the mixed layer inside and outside the patch using Niskin bottles. Aplastidic dinoflagellates increased threefold in abundance and biomass in the first 10 d of the experiment, but decreased thereafter to values twofold higher than pre-fertilisation values. The decline after day 10 is attributed to increasing grazing pressure by copepods. They also constrained ciliate abundances and biomass which were higher inside the fertilised patch than outside but highly variable. Copepod nauplii abundance also remained stable whereas biomass doubled. Numbers of copepodites and adults of small copepod species increased threefold inside the patch, but doubled in surrounding waters. Grazing rates estimated using the dilution method suggest that microzooplankton grazing constrained pico- and nanoplankton populations, but species capable of feeding on large diatoms (dinoflagellates and small copepods including possibly nauplii) were selectively predated by the metazoan community. Thus, iron fertilisation of a developing spring phytoplankton assemblage resulted in a trophic cascade which favoured dominance of the bloom by large diatoms.
    Keywords: ANT-XVIII/2; CTD/Rosette; CTD117; CTD123; CTD126; CTD128; CTD145; CTD149; CTD16; CTD18; CTD45; CTD51; CTD54; CTD57; CTD61; CTD66; CTD70; CTD74; CTD87; CTD9; CTD-RO; EisenEx; European Iron Enrichment Experiment in the Southern Ocean; Polarstern; PS58/009-2; PS58/011-1; PS58/012-5; PS58/014-4; PS58/038-3; PS58/041-2; PS58/042-2; PS58/043-2; PS58/045-2; PS58/046-3; PS58/048-3; PS58/049-3; PS58/061-1; PS58/088-4; PS58/090-4; PS58/091-4; PS58/092-3; PS58/107-5; PS58/108-1; PS58 EISENEX; South Atlantic
    Type: Dataset
    Format: application/zip, 38 datasets
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  • 7
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    Abundance of non-diatom phytoplankton measured on water bottle samples at station PS58/088-4
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: ANT-XVIII/2; CTD/Rosette; CTD117; CTD-RO; DEPTH, water; Dinoflagellates, autotrophic; EisenEx; European Iron Enrichment Experiment in the Southern Ocean; Mesoporos perforatus; Polarstern; Prorocentrum spp.; PS58/088-4; PS58 EISENEX; Quantitative phytoplankton method (Utermöhl, 1958); South Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 70 data points
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  • 8
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    Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean
    PANGAEA
    In:  Supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362, https://doi.org/10.1016/j.dsr.2006.12.005
    Details
    Publication Date: 2023-05-12
    Description: The dynamics of phytoplankton species populations recorded during the 3-week, iron-fertilization experiment EisenEx carried out in spring in the Antarctic Polar Frontal Zone are presented and discussed as the difference between growth and mortality rates. Only two cosmopolitan diatom species, the centric Chaetoceros debilis and the pennate Pseudo-nitzschia lineola, increased population density exponentially throughout the experiment to 150-fold and 90-fold of initial values respectively. Because C. debilis initial abundance was tenfold lower than that of P. lineola, the two contributed 1 % and 21 % to bloom biomass respectively at the end of the experiment, high-lighting the role of seeding in bloom formation. The other significant species increased population size at a linear rate throughout the experiment or for a short spurt phase to 3 to 18-fold of initial values. Conservative estimates of mortality rates within diatom species populations were obtained by comparing net accumulation rates of full cells with those of empty and broken frustules. The ratios were consistent over time for the various species but varied widely between them. The species-specific variation can be explained by differences in both growth and mortality rates, the latter partly due to either selective grazing or avoidance by the large protozoo- and metazooplankton populations present. Selective predation by the abundant copepod populations on protistan grazers (ciliates and heterotrophic dinoflagellates) of diatoms apparently aided diatom biomass build-up. The response patterns of populations of the phytoplankton species present fall into 6 categories comprising disparate species, indicating that phylogeny is a poor predictor of ecology. The group that did not respond to fertilization was the most diverse and included both endemic and cosmopolitan as well as background and bloom-forming species. This lack of response to the advent of favorable growth conditions indicates that proximate factors during EisenEx triggered growth only in some species but had little effect on others. We attribute the differences in behavior to ultimate factors such as seasonal effects on life cycles and other internal constraints on growth rates. The implications for our understanding of the evolutionary ecology of phytoplankton and its impact on global biogeochemical cycles are pointed out.
    Keywords: ANT-XVIII/2; CTD/Rosette; CTD117; CTD123; CTD126; CTD128; CTD145; CTD149; CTD16; CTD18; CTD45; CTD51; CTD54; CTD57; CTD61; CTD66; CTD70; CTD74; CTD88; CTD9; CTD-RO; EisenEx; European Iron Enrichment Experiment in the Southern Ocean; Polarstern; PS58/009-2; PS58/011-3; PS58/012-5; PS58/014-4; PS58/038-3; PS58/041-2; PS58/042-2; PS58/043-2; PS58/045-2; PS58/046-3; PS58/048-3; PS58/049-3; PS58/061-3; PS58/088-4; PS58/090-4; PS58/091-4; PS58/092-3; PS58/107-5; PS58/108-1; PS58 EISENEX; South Atlantic
    Type: Dataset
    Format: application/zip, 95 datasets
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    DATA PANGAEA
  • 9
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    Large protozoan and small metazoan abundance measured on concentrated water bottle samples at station PS65/593-18 (2007)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-07-10
    Keywords: Acantharia; Acantharians, skeletons, empty; Acanthostaurus spp.; Acanthostomella norvegica; Acanthrometra spp.; Achradina spp.; Actinomma antarcticum; Amphistaurus spp.; Amphorellopsis spp.; Amphorides spp.; Antarctissa spp.; ANT-XXI/3; Calanoida, copepodites, other; Calanoida, nauplii, other; Ceratium lineatum; Ceratium pentagonum; Challengeron spp.; Challengria spp.; Codonellopsis gaussii; Codonellopsis pusilla; Copepoda, juvenile; Copepodites; Counting; Counting 〈50 µm fraction; Counting 〉50 µm fraction; CTD/Rosette; CTD-RO; Ctenocalanus spp., copepodites; Ctenocalanus spp., nauplii; Cyclodophora bicornis; Cymatocylis antarctica; Cymatocylis calyciformis; Cymatocylis convallaria; Cymatocylis nobilis; Cymatocylis vanhoeffeni; DEPTH, water; Dictiophymus spp.; Dinoflagellates, thecate; Dinophysis spp.; Diplopsalis spp.; EIFEX; Euphysetta elegans; European Iron Fertilization Experiment; Favella spp.; Foraminifera, planktic; Foraminifera, planktic, adult; Foraminifera, planktic, juvenile; Gigartacon spp.; Globigerina bulloides; Laakmaniella spp.; Lirella spp.; Lithelius spp.; Lithomelissa setosa; Lonchostaurus spp.; Lophospyris spp.; Metridia spp., copepodites; Metridia spp., nauplii; Microsetella spp., copepodites; Microsetella spp., nauplii; Nassellaria; Nassellaria, juvenile; Nauplii; Neogloboquadrina pachyderma; Oithona spp., adult; Oithona spp., copepodites; Oithona spp., nauplii; Oncaea spp., copepodites; Oncaea spp., nauplii; Ormosella spp.; Phaeodaria; Phaeodaria indeterminata; Phalacroma spp.; Phyllostraurus spp.; Podolampas spp.; Polarstern; Protocystis spp.; Protocystis swirei; Protoperidinium spp.; Protorhabdonella spp.; PS65/593-18; PS65 EIFEX; Radiolarians; Radiolarians, adult; Radiolarians, juvenile; Rhincalanus gigas, nauplii; Salpingella spp.; Siphocampe spp.; South Atlantic Ocean; Spongophyle setosa; Spongotrochus glacialis; Spumellaria; Spumellaria, juvenile; Stauracon spp.; Steenstrupiella spp.; Stenosomella spp.; Sticholonche spp.; Tintinnid; Tintinnid loricae, full; Tintinnopsis spp.; Tolospyris spp.; Turborotalita quinqueloba
    Type: Dataset
    Format: text/tab-separated-values, 1044 data points
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  • 10
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    Large protozoan and small metazoan abundance measured on concentrated water bottle samples at station PS65/593-14 (2007)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-07-10
    Keywords: Acantharia; Acantharians, skeletons, empty; Acanthostaurus spp.; Acanthostomella norvegica; Acanthrometra spp.; Achradina spp.; Actinomma antarcticum; Amphistaurus spp.; Amphorellopsis spp.; Amphorides spp.; Antarctissa spp.; ANT-XXI/3; Calanoida, copepodites, other; Calanoida, nauplii, other; Ceratium lineatum; Ceratium pentagonum; Challengeron spp.; Challengria spp.; Codonellopsis gaussii; Codonellopsis pusilla; Copepoda, juvenile; Copepodites; Counting; Counting 〈50 µm fraction; Counting 〉50 µm fraction; CTD/Rosette; CTD-RO; Ctenocalanus spp., copepodites; Ctenocalanus spp., nauplii; Cyclodophora bicornis; Cymatocylis antarctica; Cymatocylis calyciformis; Cymatocylis convallaria; Cymatocylis nobilis; Cymatocylis vanhoeffeni; DEPTH, water; Dictiophymus spp.; Dinoflagellates, thecate; Dinophysis spp.; Diplopsalis spp.; EIFEX; Euphysetta elegans; European Iron Fertilization Experiment; Favella spp.; Foraminifera, planktic; Foraminifera, planktic, adult; Foraminifera, planktic, juvenile; Gigartacon spp.; Globigerina bulloides; Laakmaniella spp.; Lirella spp.; Lithelius spp.; Lithomelissa setosa; Lonchostaurus spp.; Lophospyris spp.; Metridia spp., copepodites; Metridia spp., nauplii; Microsetella spp., copepodites; Microsetella spp., nauplii; Nassellaria; Nassellaria, juvenile; Nauplii; Neogloboquadrina pachyderma; Oithona spp., adult; Oithona spp., copepodites; Oithona spp., nauplii; Oncaea spp., copepodites; Oncaea spp., nauplii; Ormosella spp.; Phaeodaria; Phaeodaria indeterminata; Phalacroma spp.; Phyllostraurus spp.; Podolampas spp.; Polarstern; Protocystis spp.; Protocystis swirei; Protoperidinium spp.; Protorhabdonella spp.; PS65/593-14; PS65 EIFEX; Radiolarians; Radiolarians, adult; Radiolarians, juvenile; Rhincalanus gigas, nauplii; Salpingella spp.; Siphocampe spp.; South Atlantic Ocean; Spongophyle setosa; Spongotrochus glacialis; Spumellaria; Spumellaria, juvenile; Stauracon spp.; Steenstrupiella spp.; Stenosomella spp.; Sticholonche spp.; Tintinnid; Tintinnid loricae, full; Tintinnopsis spp.; Tolospyris spp.; Turborotalita quinqueloba
    Type: Dataset
    Format: text/tab-separated-values, 1392 data points
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