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  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Compartmentation and turnover of organic carbon in the Staghorn coral Acropora formosa (1980)
    Springer
    Marine biology 59 (1980), S. 181-187 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four colonies of Acropora formosa were incubate with Na2 14CO3 for separate 2 h periods within a 24 h period, and then returned to the reef from which they were collected. Terminal branches were collected at intervals over the following 5 d and analysed for radioactivity associated with the skeleton and certain organic pools. Colonies incubated at night showed little or no loss of fixed radioactivity during the 5 d on the reef. However, 50–60% of photosynthetically-fixed 14C was lost from the terminal branches during the first 40 h on the reef. This loss of radioactivity probably resulted from release of mucus and dissolved organic carbon from the coral tissues. Most of the loss of photosynthetically-fixed 14C was due to decrease in the radioactivity of lipids (80% of the total 14C loss) and methanol-water soluble compounds. Determination of any sequencing in metabolic compartments was made difficult by the rapidity with which 14C dissappeared from most of the metabolic pools measured. 14C was incorporated into the skeleton throughout the 5 d on the reef, although the rate of incorporation was very low in colonies which had been incubated with Na2 14CO3 at night.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396866
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diurnal lipid and mucus production in the staghorn coral Acropora acuminata (1980)
    Springer
    Marine biology 60 (1980), S. 81-90 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Net 14C-accumulation into lipids of Acropora acuminata was rapid and increased with light intensity. Dark 14C-incorporation was less than 1% noon maximum. Structural lipids were the first radioactively labelled lipid types showing linear 14C-uptake kinetics. Storage lipids showed non-linear, power-curve kinetics for 14C-uptake. The rate of 14C-incorporation into triglycerides and wax esters was maximal during early afternoon and at midday, respectively. Electron microscopic evidence is given for zooxanthellae being primary sites for synthesis of lipids which are exuded from chloroplasts and transferred to animal tissues. Free lipid droplets and crystalline inclusions (wax ester) were common in animal tissues, the inclusions being often associated with mucus-producing cells. The diurnal rate of mucus production was constant. However, 14C-mucus-lipid production showed a light-dependent diurnal pattern and accounted for 60 to 90% total 14C of mucus during periods of photosynthetically-saturating light. Here, 14C was primarily associated with wax esters which were always present in the mucus-lipid. 14C-triglycerides occur in mucus released only during the day. Lipid and mucus synthesis is discussed in relation to the carbon budget of A. acuminata, in which mucus represented a loss of 40% net C fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389151
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Variability in the calcification rate of Acropora acuminata measured with radioisotopes (1982)
    Springer
    Coral reefs 1 (1982), S. 53-57 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Summary Under standard experimental conditions, sample groups of Acropora acuminata gave calcification results having a coefficient of variation approaching 50%. Because of this, the resolution of radioisotope measurements approaches the magnitude of the effect of light on calcification rate. Differences in calcification rate between samples appear to be caused by short-term variations in calcification rate of samples, rather than size differences between samples. The coefficient of variation associated with results can be decreased by relatively straightforward modifications to the standard technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286540
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    Paper (German National Licenses)
    Fulltext
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