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  • 2010-2014  (116)
  • 1995-1999  (15)
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  • 1
    Schlagwort(e): Forschungsbericht ; Flohkrebse ; Nahrungskette
    Materialart: Online-Ressource
    Seiten: Online-Ressource (PDF-Datei: 42 S., 3.114 KB) , Ill., graph. Darst., Kt.
    Sprache: Deutsch
    Anmerkung: Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Förderkennzeichen BMBF 03F0629A , Systemvoraussetzungen: Acrobat reader.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Polar biology 16 (1996), S. 409-422 
    ISSN: 1432-2056
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  The development of the phytoplankton bloom and its relation to water column stabilisation during the transition from early to high summer (of 1991) in the seasonally ice-covered zone of the Barents Sea were studied from a meridional transect of repeated hydrographic/biological stations. The water column stabilisation is described in detail with the aid of vertical profiles of the Brunt-Väisälä frequency squared (N2). The contributions of seasonal warming and ice melting to stabilisation are elucidated by determining the effects of temperature and salinity on N2. The spring bloom in 1991 migrated poleward from June to July by about 400 km, associated with the retreat of the ice edge. The spring bloom culminated with maximum chlorophyll concentrations in the mixed layer about 100–300 km north of the centre of the meltwater lens, at its northern edge, where the ice cover was still substantial. From the distribution of N2 it becomes obvious that the bloom starts at the very beginning of stabilisation, which results solely from the release of meltwater. The increase in temperature due to the seasonal warming does not contribute to the onset of vernal blooming; temperature starts to contribute to the stratification later, when the spring bloom has ceased due to the exhaustion of nutrients in the mixed layer. By that time a deep chlorophyll maximum has formed in the seasonal pycnocline, 20–30 m below the base of the mixed layer. The effect of the seasonal ice cover on the mean areal new primary production is discussed.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    facet.materialart.
    Unbekannt
    Wiley-Blackwell ; BioOne
    In:  Journal of Eukaryotic Microbiology, 61 (6). pp. 569-579.
    Publikationsdatum: 2015-03-13
    Beschreibung: Investigation of marine eukaryotic picoplankton composition is limited by missing morphological features for appropriate identification. Consequently, molecular methods are required. In this study, we used 454-pyrosequencing to study picoplankton communities at four stations in the West Spitsbergen Current (WSC; Fram Strait). High abundances of Micromonas pusilla were detected in the station situated closest to Spitsbergen, as seen in surveys of picoplankton assemblages in the Beaufort Sea. At the other three stations, other phylotypes, affiliating with Phaeocystis pouchetii and Syndiniales in the phylogenetic tree, were present in high numbers, dominating most of them. The picoplankton community structures at three of the stations, all with similar salinity and temperature, were alike. At the fourth station, the influence of the East Spitsbergen Current, transporting cold water from the Barents Sea around Spitsbergen, causes different abiotic parameters that result in a significantly different picoeukaryote community composition, which is dominated by M. pusilla. This observation is particularly interesting with regard to ongoing environmental changes in the Arctic. Ongoing warming of the WSC could convey a new picoplankton assemblage into the Arctic Ocean, which may come to affect the dominance of M. pusilla.
    Materialart: Article , PeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Publikationsdatum: 2019-09-23
    Beschreibung: Highlights: • Activity of Arctic bacterioplankton in summer is regulated by concentration and composition of organic matter. • Bacterial production in Fram Strait is significantly related to concentrations of total amino acids. • Bacterioplankton in Polar Water show enhanced enzymatic hydrolysis of combined carbohydrates compared to Atlantic Water. Abstract The bacterial turnover of organic matter was investigated in Fram Strait at 79°N. Both Atlantic Water (AW) inflow and exported Polar Water (PW) were sampled along a transect from Spitsbergen to the eastern Greenland shelf during a late successional stage of the main annual phytoplankton bloom in summer. AW showed higher concentrations of amino acids than PW, while organic matter in PW was enriched in combined carbohydrates. Bacterial growth and degradation activity in AW and PW were related to compositional differences of organic matter. Bacterial production and leucine-aminopeptidase along the transect were significantly correlated with concentrations of amino acids. Activity ratios between the extracellular enzymes β-glucosidase and leucine-aminopeptidase indicate the hydrolysis potential for polysaccharides relative to proteins. Along the transect, these ratios showed a higher hydrolysis potential for polysaccharides relative to proteins in PW than in AW, thus reflecting the differences in organic matter composition between the water masses. Q10 values for bacterial production ranged from 2.4 (± 0.8) to 6.0 (± 6.8), while those for extracellular enzymes showed a broader range of 1.5 (± 0.5) to 23.3 (± 11.8). Our results show that in addition to low seawater temperature also organic matter availability contributes to the regulation of bacterial growth and enzymatic activity in the Arctic Ocean.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Publikationsdatum: 2015-08-03
    Beschreibung: Our ability to understand the complex interactions of biological, chemical, physical, and geological processes in the ocean and on land is still limited by the lack of integrative and interdisciplinary observation infrastructures. The main purpose of the planned open-ocean infrastructure FRAM (FRontiers in Arctic marine Monitoring) is permanent presence at sea, from surface to depth, for the provision of near real-time data on climate variability and ecosystem change in a marine Arctic system. The Alfred-Wegener-Institut - Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), together with partner institutes in Germany and Europe, aims at providing such infrastructure for the polar ocean as a major contribution to the grand challenges of Earth observation and environmental status. The FRAM Ocean Observing System targets the gateway between the North Atlantic and the Central Arctic, representing a highly climate-sensitive and rapidly changing region of the Earth system. It will serve national and international tasks towards a better understanding of the effects of change in ocean circulation, water mass properties and sea-ice retreat on Arctic marine ecosystems and their main functions and services. FRAM will implement existing and nextgeneration sensors and observatory platforms, allowing synchronous observation of relevant ocean variables, as well as the study of physical, chemical and biological processes in the water column and at the seafloor. Experimental and event-triggered platforms will complement observational platforms. Products of the infrastructure are continuous long-term data with appropriate resolution in space and time, as well as ground-truthing information for ocean models and remote sensing. FRAM will integrate and develop already existing observatories, i.e. the oceanographic mooring array HAFOS (Hybrid Arctic/Antarctic Float Observing System) and the Long-Term Ecological Research (LTER) site HAUSGARTEN.
    Materialart: Conference or Workshop Item , PeerReviewed
    Format: text
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  • 6
    facet.materialart.
    Unbekannt
    Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
    In:  In: The Expedition of the Research Vessel "Polarstern" to the Arctic in 2012 (ARK-XXVII/2). , ed. by Soltwedel, T. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 658 . Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany, pp. 28-32.
    Publikationsdatum: 2016-06-03
    Materialart: Book chapter , NonPeerReviewed
    Format: text
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  • 7
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publikationsdatum: 2023-03-16
    Schlagwort(e): ARK-XXIV/2; AWI_EcolChem; Colorometric autoanalysis; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Ecological Chemistry @ AWI; Elevation of event; Event label; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; HG_IV; Latitude of event; Longitude of event; Long-term Investigation at AWI-Hausgarten off Svalbard; N4; Nitrate; Nitrite; North Greenland Sea; Optional event label; Phosphate; Polarstern; PS74; PS74/104-1; PS74/116-1; PS74/133-1; Silicate; V12
    Materialart: Dataset
    Format: text/tab-separated-values, 88 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publikationsdatum: 2023-03-16
    Schlagwort(e): Ammonium; ARK-XXV/2; AWI_EcolChem; Colorometric autoanalysis; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Ecological Chemistry @ AWI; Elevation of event; Event label; Fluorometric autoanalysis; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; HG_I; HG_IV; Kb0; Latitude of event; Longitude of event; Long-term Investigation at AWI-Hausgarten off Svalbard; N4; Nitrate; Nitrite; North Greenland Sea; Optional event label; Phosphate; Polarstern; PS76; PS76/134-1; PS76/135-1; PS76/136-1; PS76/149-2; PS76/173-1; PS76/179-3; Silicate; V12
    Materialart: Dataset
    Format: text/tab-separated-values, 269 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publikationsdatum: 2023-03-16
    Schlagwort(e): Ammonium; ARK-XXVII/2; AWI_EcolChem; Colorometric autoanalysis; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Ecological Chemistry @ AWI; Elevation of event; Event label; Fluorometric autoanalysis; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; HG_I; HG_IV; HG_IX; Latitude of event; Longitude of event; Long-term Investigation at AWI-Hausgarten off Svalbard; N4; Nitrate; Nitrite; North Greenland Sea; Optional event label; Phosphate; Polarstern; PS80; PS80/165-2; PS80/168-3; PS80/173-2; PS80/176-3; PS80/184-1; PS80/185-3; PS80/189-2; S3; Silicate
    Materialart: Dataset
    Format: text/tab-separated-values, 249 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publikationsdatum: 2023-03-16
    Schlagwort(e): Ammonium; ARK-XXVI/2; AWI_EcolChem; Colorometric autoanalysis; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Ecological Chemistry @ AWI; Elevation of event; Event label; Fluorometric autoanalysis; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; HG_III; HG_IV; HG_IX; HG_VII; KH; Latitude of event; Longitude of event; Long-term Investigation at AWI-Hausgarten off Svalbard; N4; Nitrate; Nitrite; Optional event label; Phosphate; Polarstern; PS78; PS78/143-1; PS78/145-16; PS78/151-1; PS78/153-1; PS78/154-1; PS78/159-1; PS78/162-3; PS78/162-7; PS78/174-1; PS78/177-2; S3; Silicate; V12
    Materialart: Dataset
    Format: text/tab-separated-values, 305 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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