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    Availability of phosphate for phytoplankton and bacteria and of labile organic carbon for bacteria at different pCO2 levels in a mesocosm study (2008)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 5 . pp. 669-678.
    Details
    Publication Date: 2012-07-06
    Description: Availability of phosphate for phytoplankton and bacteria and of glucose for bacteria at different pCO2 levels were studied in a mesocosm experiment (PeECE III). Using nutrient-depleted SW Norwegian fjord waters, three different levels of pCO2 (350 μatm: 1×CO2; 700 μatm: 2×CO2; 1050 μatm: 3×CO2) were set up, and nitrate and phosphate were added at the start of the experiment in order to induce a phytoplankton bloom. Despite similar responses of total particulate P concentration and phosphate turnover time at the three different pCO2 levels, the size distribution of particulate P and 33PO4 uptake suggested that phosphate transferred to the 〉10 μm fraction was greater in the 3×CO2 mesocosm during the first 6–10 days when phosphate concentration was high. During the period of phosphate depletion (after Day 12), specific phosphate affinity and specific alkaline phosphatase activity (APA) suggested a P-deficiency (i.e. suboptimal phosphate supply) rather than a P-limitation for the phytoplankton and bacterial community at the three different pCO2 levels. Specific phosphate affinity and specific APA tended to be higher in the 3×CO2 than in the 2×CO2 and 1×CO2 mesocosms during the phosphate depletion period, although no statistical differences were found. Glucose turnover time was correlated significantly and negatively with bacterial abundance and production but not with the bulk DOC concentration. This suggests that even though constituting a small fraction of the bulk DOC, glucose was an important component of labile DOC for bacteria. Specific glucose affinity of bacteria behaved similarly at the three different pCO2 levels with measured specific glucose affinities being consistently much lower than the theoretical maximum predicted from the diffusion-limited model. This suggests that bacterial growth was not severely limited by the glucose availability. Hence, it seems that the lower availability of inorganic nutrients after the phytoplankton bloom reduced the bacterial capacity to consume labile DOC in the upper mixed layer of the stratified mesocosms.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/bg-5-669-2008
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of chemostat culture: The effect of a delay in cell response
    Amsterdam : Elsevier
    Journal of Theoretical Biology 48 (1974), S. 149-159 
    Details
    ISSN: 0022-5193
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-5193(74)90186-6
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Dynamics of virus abundance in coastal seawater (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 19 (1996), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: The short term dynamics of virus abundance in coastal sea water was investigated by frequent sampling of open ecosystems and of water incubated in bottles in situ. Sampling intervals were 6–10 min. The viral abundance showed significant temporal fluctuations both in situ and in the bottles and it changed in some cases by a factor of 2–4 within 10–20 min. Laboratory incubations showed that production and release of viruses wre not induced or stimulated by nutrient addition, high light intensities or transient increase in temperatures ca. 10°C. Our interpretation of these results is that they result from synchronous lysis and release of virus particles from bacterial hosts and a rapid disintegration of these particles when released in sea water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1996.tb00218.x
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    On the connection between bacterial growth and division
    Amsterdam : Elsevier
    Bulletin of Mathematical Biology 38 (1976), S. 415-423 
    Details
    ISSN: 0092-8240
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0092-8240(76)80021-3
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    On the connection between bacterial growth and division
    Amsterdam : Elsevier
    Bulletin of Mathematical Biology 38 (1976), S. 415-423 
    Details
    ISSN: 0092-8240
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0092-8240(76)80021-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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