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  • 1
    Electronic Resource
    Electronic Resource
    Phytoplankton growth and CO 2 (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 678-679 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] RIEBESELL ET AL. REPLY - Turpin makes two important points pertinent to the question of CO2 limitation of phyto-plankton growth. With respect to his first comment, we agree that inorganic carbon use by the common marine di-atom species needs to be rigorously tested. With the exception of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363678c0
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Das Kohlenstoffrätsel (1993)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 23 (1993), S. 97-101 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Etwa ein Drittel des von Menschen freigesetzten Treibhausgases Kohlendioxid (CO2) reichert sich in der Atmosphäre an und verstärkt dort den Treibhauseffekt. Zwei Drittel dieses Eintrags werden der Atmosphäre wieder entzogen und an anderer Stelle deponiert. Doch nur für etwa die Hälfte des wieder gebundenen Kohlendioxids kennen wir bisher die Senken. Wo bleibt der Rest? Um Aussagen über den Verbleib weiterer CO2-Emissionen und damit über die zukünftige Entwicklung des Treibhauseffektes machen zu können, bedarf es der Lösung des Kohlenstoffrätsels.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19930230208
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Aggregation of algae released from melting sea ice: Implications for seeding and sedimentation (1991)
    Springer
    In:  Polar Biology, 11 . pp. 239-248.
    Details
    Publication Date: 2016-11-14
    Description: Factors influencing the fate of ice algae released from melting sea ice were studied during a R V Polarstern cruise (EPOS Leg 2) to the northwestern Weddell Sea. The large-scale phytoplankton distribution patterns across the receding ice edge and small-scale profiling of the water column adjacent to melting ice floes indicated marked patchiness on both scales. The contribution of typical ice algae to the phytoplankton was not significant. In experiments simulating the conditions during sea ice melting, ice algae revealed a strong propensity to form aggregates. Differences in the aggregation potential were found for algal assemblages collected from the ice interior and the infiltration layer. Although all algal species collected from the ice were also found in aggregates, the species composition of dispersed and aggregated algae differed significantly. Aggregates were of a characteristic structure consisting of monospecific microaggregates which are likely to have formed in the minute brine pockets and channels within the ice. Sinking rates of aggregates were three orders of magnitude higher than those of dispersed ice algae. These observations, combined with the negligible seeding effect of ice algae found during this study, suggest that ice algae released from the melting sea ice are subject to rapid sedimentation. High grazing pressure at the ice edge of the investigation area is another factor eliminating ice algae released during melting. Data presented here were collected during the European Polarstern Study (EPOS) sponsored by the European Science Foundation
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/BF00238457
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Das Defizit in der Kohlenstoffbilanz. (1992)
    Spektrum d. Wiss. Verl.-Ges.
    In:  Spektrum der Wissenschaft, 7 . pp. 28-32.
    Details
    Publication Date: 2016-06-20
    Type: Article , NonPeerReviewed
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    OceanRep: Article in a Scientific Journal - without review
  • 5
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    Bremsen Algen die globale Erwärmung? (1993)
    Spektrum d. Wiss. Verl.-Ges.
    In:  Spektrum der Wissenschaft, 10 . pp. 24-27.
    Details
    Publication Date: 2016-06-20
    Description: Der vom Menschen bewirkte Anstieg des Gehalts der Atmosphäre an Kohlendioxid stimuliert nach neuesten Untersuchungen das Wachstum winziger Planktonalgen im Meer. Dadurch könnten die Ozeane mehr von dem Treibhausgas aufgenommen haben, so daß die Erde bisher vor einer stärkeren Erwärmung bewahrt blieb.
    Type: Article , NonPeerReviewed
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    OceanRep: Article in a Scientific Journal - without review
  • 6
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    Das Kohlenstoffrätsel (1993)
    Wiley
    In:  Biologie in unserer Zeit, 23 (2). pp. 97-101.
    Details
    Publication Date: 2016-06-17
    Description: Etwa ein Drittel des von Menschen freigesetzten Treibhausgases Kohlendioxid (CO2) reichert sich in der Atmosphäre an und verstärkt dort den Treibhauseffekt. Zwei Drittel dieses Eintrags werden der Atmosphäre wieder entzogen und an anderer Stelle deponiert. Doch nur für etwa die Hälfte des wieder gebundenen Kohlendioxids kennen wir bisher die Senken. Wo bleibt der Rest? Um Aussagen über den Verbleib weiterer CO2-Emissionen und damit über die zukünftige Entwicklung des Treibhauseffektes machen zu können, bedarf es der Lösung des Kohlenstoffrätsels.
    Type: Article , NonPeerReviewed
    Format: text
    DOI: 10.1002/biuz.19930230208
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    OceanRep: Article in a Scientific Journal - without review
  • 7
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    The relationship between physical aggregation of phytoplankton and particle flux: a numerical model (1992)
    Pergamon Press
    In:  Deep Sea Research Part A. Oceanographic Research Papers, 39 (7-8). pp. 1085-1102.
    Details
    Publication Date: 2016-09-30
    Description: Since large, rapidly-sinking particles account for most of the vertical flux in the ocean, mechanisms responsible for particle aggregation largely control the transport of carbon to depth. The particle flux resulting from a variety of different phytoplankton bloom conditions was simulated with a numerical model in which phytoplankton growth dynamics were combined with physical aggregation, particle size-dependent sedimentation and degradation. Model results demonstrated that particle flux to the deep ocean be generated by solely invoking physical aggregation during phytoplankton blooms. Sensitivity of the model in response to variations of both physico-chemical and biological paramters was tested. The model outcome, described as the fraction of export production leaving the upper ocean carbon pool, proved to be most sensitive to biological variables such as phytoplankton cell size, stickness, and growth characteristics (i.e. solitary vs chain-forming). Changes in these factors strongly affect the efficiency of the “biological pump” and could be explain interannual and geographic variance in deep-ocean flux.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0198-0149(92)90058-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Particle aggregation during a diatom bloom II. Biological aspects (1991)
    Inter Research
    In:  Marine Ecology Progress Series, 69 . pp. 281-291.
    Details
    Publication Date: 2018-05-07
    Description: For a 6 wk period covering the time before, during, and after the phytoplankton spring bloom, macroscopic aggregates (2 0.5 mm diameter) were repeatedly collected and water column properties simultaneously measured at a fixed station in the Southern North Sea. Distinct changes in aggregate structure and composition were observed during the study. Predominantly detrital aggregates during the early phase of the study were followed by diatom-dominated algal flocs around the peak of the bloom. Mucus-rich aggregates containing both algal and detrital components and with large numbers of attached bacteria dominated the post-bloom interval. The phytoplankton succession within the aggregates closely reflected the succession in the water column with a time delay of a few days. Algal flocculation did not occur as a simultaneous aggregation of the entire phytoplankton community, but as a successional aggregat~on of selected diatom species. Although the concentrations of inorganic nutrients diminished considerably during the development of the phytoplankton bloom, the termination of the bloom appeared to be mostly controlled by physical coagulation processes. The importance of biologically-controlled factors for physical coagulation is discussed.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Factors controlling the formation of marine snow and its sustained residence in surface waters (1992)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 37 (1). pp. 63-76.
    Details
    Publication Date: 2014-01-30
    Description: The formation of large marine snow macroflocs and stringers was monitored at a fixed station in the southern North Sea. During an 18-month investigation, large marine snow floes occurred in the water column on nine occasions for periods lasting between 5 and 16 d. Their formation coincided with both high phytoplankton biomass and low windspeeds. Retention of marine snow in the surface layer was related to slow sinking, neutral buoyancy, and rising of the large floes. Applying a specially developed instrument showed buoyancy to be caused by gas bubbles incorporated in the floes. Marine snow flotation coincided with periods of oxygen supersaturation in the water column, suggesting that oxygen production could be responsible for gas bubble formation within the floes. Disappearance of the large marine snow floes from the surface layer coincided with drastic increases in windspeed, indicating that enhanced wind-induced turbulent mixing in the surface layer could have resulted in the breakup of these floes. Formation and disappearance of marine snow had a marked influence on the light regime in the water.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Aggregation of Phaeocystis during phytoplankton spring blooms in the southern North Sea. (1993)
    Inter Research
    In:  Marine Ecology Progress Series, 96 . pp. 281-289.
    Details
    Publication Date: 2018-05-07
    Description: While marine snow aggregates were devoid of Phaeocystis in 1989, a large fraction of the Phaeocystis biomass was associated with aggregates two years later. This discrepancy corresponds to a significant difference in aggregate size between the two years studied, interpreted to be a consequence of different levels of turbulent mixing. Phaeocystis colonies remained freely suspended during 1989 when aggregates were small, and adhered loosely to the large aggregates observed forming during 1991. Overall, the aggregation potential of Phaeocystis was low in comparison to diatoms. Independent of the degree of aggregation, sedimentation was the dominant loss factor of Phaeocystis biomass from the upper layer
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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