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  • 1
    Electronic Resource
    Electronic Resource
    Inorganic carbon acquisition by two Antarctic macroalgae, Porphyra endiviifolium (Rhodophyta: Bangiales) and Palmaria decipiens (Rhodophyta: Palmariales) (1999)
    Springer
    Polar biology 21 (1999), S. 310-315 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aspects of the physiology of two rhodophyte macroalgae from the Antarctic, Palmaria decipiens and Porphyra endiviifolium, were examined. Both species showed low light compensation points and I k values. Measurements of the dissolved inorganic carbon dependent kinetics of oxygen evolution gave values for K 0.5 (CO2) of 10.5 and 3.7 μM for Palmaria and Porphyra respectively. These values are lower than expected from the kinetic properties of ribulose 1,5-bisphosphate carboxylase oxygenase and imply that the two species are capable of the active transport and accumulation of dissolved inorganic carbon by a “CO2 concentrating mechanism”. Both organisms are able to use bicarbonate from the bulk medium. These features are similar to those found in temperate species and thus, despite the low photon flux, low temperatures and consequent elevated CO2 concentrations in seawater at air-equilibration, the Antarctic rhodophytes examined appeared not to have a diminished capacity for transport of dissolved inorganic carbon and internal CO2 concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050367
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Inorganic C-sources for Lemanea, Cladophora and Ranunculus in a fast-flowing stream: Measurements of gas exchange and of carbon isotope ratio and their ecological implications (1982)
    Springer
    Oecologia 53 (1982), S. 68-78 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary CO2-and O2-exchange characteristics and δ13C values have been measured in a rhodophycean haptophyte (Lemanea mamillosa), a chlorophycean haptophyte (Cladophora glomerata) and a magnoliophyte rhizophyte (Ranunculus sp.) from a 5 m stretch of the Dichty Burn near Dundee. Light-and CO2-saturated rates of photosynthesis are greatest on a dry weight basis for Cladophora and lowest for Lemanea; the order is reversed on a surface area basis. The CO2 concentration at pH 6.5 at which photosynthesis is half-saturated is 25–40 μM, with Lemanea rather lower than Cladophora or Ranunculus; these half-saturation values are similar to the free CO2 concentration in the Burn water. Lemanea cannot use HCO 3 - in photosynthesis, while Cladophora and Ranunculus can. Despite being within a factor or two of saturation with free CO2 in terms of the bulk water concentration, the growth habit of Cladophora and, particularly, Ranunculus means that the high water velocity in the Burn does not necessarily prevent C depletion effects around the plants, thus providing a possible role for HCO 3 - use by these plants. Lemanea lives in the fastest-growing parts of the Burn, and its growth habit insures that it is exposed to this high water velocity, thus minimising CO2 depletion during photosynthesis despite the low surface/volume ratio for this plant. δ13C measurements on the inorganic C in the Burn water are consistent with at least part of its excess (above air-equilibrium) inorganic C levels coming from heterotrophic activity. Lemanea has the most negative δ13C value of the three plants, consistent with CO2 use and small diffusion resistances. Ranunculus has the least negative δ13C value, consistent with some CO2 depletion and/or HCO 3 - use in situ related to a high diffusion resistance in a rhizophyte which does not have to obtain all of its N and P from the bulk water but can obtain some from the sediments. Cladophora is intermediate, suggesting some CO2 depletion and/or HCO 3 - use in this densely growing haptophyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377138
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in chlorophyll fluorescence during exposure of Dunaliella tertiolecta to UV radiation indicate a dynamic interaction between damage and repair processes (2000)
    Springer
    Photosynthesis research 63 (2000), S. 123-134 
    Details
    ISSN: 1573-5079
    Keywords: Dunaliella tertiolecta ; fluorescence ; microalgae ; PS II ; UVR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthesis in the green alga Dunaliella tertiolecta, as measured by chlorophyll fluorescence, is inhibited by ultraviolet radiation and specifically, under the conditions used, by UVB radiation (UVBR). The decline in the fluorescence parameters Fv/Fm and ΔF/Fm' under constant UVBR is a first-order function of time of exposure. The data are well-described by the Kok (1956) model, which assumes a dynamic interaction between damage and repair, with repair being proportional to the pool size of inactivated targets. The pattern of photoinhibition is also consistent with the Kok model, in that it shows an initial, approximately linear phase which is time-dependent (reciprocity holds), a transition phase and then an asymptotic phase, representing an equilibrium between damage and repair, which is determined by UVBR fluence rate (reciprocity fails). Photoinhibition in the presence of lincomycin, a protein synthesis inhibitor, is consistent with the cessation of repair processes and, under these conditions, photoinhibition is proportional to exposure time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006319802047
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    Paper (German National Licenses)
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  • 4
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    Using marine macroalgae for carbon sequestration: a critical appraisal (2011)
    Springer
    In:  Journal of Applied Phycology, 23 (5). pp. 877-886.
    Details
    Publication Date: 2018-01-19
    Description: There has been a good deal of interest in the potential of marine vegetation as a sink for anthropogenic C emissions (“Blue Carbon”). Marine primary producers contribute at least 50% of the world’s carbon fixation and may account for as much as 71% of all carbon storage. In this paper, we analyse the current rate of harvesting of both commercially grown and wild-grown macroalgae, as well as their capacity for photosynthetically driven CO2 assimilation and growth. We suggest that CO2 acquisition by marine macroalgae can represent a considerable sink for anthropogenic CO2 emissions and that harvesting and appropriate use of macroalgal primary production could play a significant role in C sequestration and amelioration of greenhouse gas emissions.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10811-010-9604-9
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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