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  • 1970-1974  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The role of metabolic nitrogen in coral calcification (1974)
    Springer
    Marine biology 28 (1974), S. 325-332 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When pieces of the staghorn coral Acropora acuminata are incubated with 14C-urea, the label is incorporated into skeletal carbonate. Incorporation of this label differs from that of H14CO 3 - , suggesting urea is not immediately hydrolysed to provide a further source of HCO 3 - . The effects of certain organic substrates upon calcification suggest the ornithine cycle is involved. Citrulline, an ornithine cycle intermediate, is found in high concentrations in the tissues of hermatypic corals. Urea, allantoins, NH3 and arginine are also present. These compounds are barely detectable in zooxanthellae or an ahermatypic coral. The allantoins may be present as calcium salts. It is suggested that allantoins are the medium by which Ca2+ and CO2 are transported to sites of calcification. Hydrolysis of urea, formed by breakdown of allantoins, yields CO2 and NH3. The NH3 may neutralise protons formed during precipitation of CaCO3 and bring about their removal from sites of calcification. As well as providing urea, the ornithine cycle may also be involved in the removal of NH3 from sites of calcification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388501
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    In situ studies of calcification and photosynthetic carbon fixation in the coralMontastrea annularis (1973)
    Springer
    Helgoland marine research 24 (1973), S. 284-291 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. The effect of varying light intensities on the rates of calcification and CO2 fixation in the coralMontastrea annularis is described. 2. High light intensities, above the saturation point of symbiont photosynthesis, are shown to inhibit the rate of calcification in both shallow and deep specimens. 3. Light enhanced calcification in reef-building corals appears to be an energy-requiring process involving the active transport of calcium and carbonate ions, and the translocation of symbiont photosynthate.
    Notes: Kurzfassung Das Ausmaß der Verkalkung und photosynthetischen Kohlenstoffixierung wurde bei Individuen vonMontastrea annularis in verschiedenen Rifftiefen und unter spezifischen Lichtbedingungen mittels der Radioisotope45Ca und14C bestimmt. Die Lichtintensität beeinflußt über die photosynthetische Tätigkeit der symbiotischen Algen vor allem die Geschwindigkeit der Verkalkung und zudem sehr wahrscheinlich die gesamte Wuchsform der Kolonie. Im allgemeinen fördern zunehmende Lichtintensitäten den Prozeß der Verkalkung, wenngleich von einer Sättigungsgrenze an dieser Vorgang eine rückläufige Tendenz aufweist. Eine derartige Beziehung konnte parallel hierzu auch für die Intensität der C-Fixierung und photosynthetischen O2-Produktion festgestellt werden. Diese in situ gewonnenen Ergebnisse wurden durch Laboruntersuchungen bestätigt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01609519
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Field and Laboratory Observations of the Crown-of-Thorns Starfish, Acanthaster planci : Locomotory Response of Acanthaster planci to Various Species of Coral (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 342-344 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE crown-of-thorns starfish, Acanthaster planci, which consumes coral tissues1,2, is destroying coral communities in widespread localities in the Pacific3–5. During a recent survey in Micronesia we noted that some corals survive better than others in the face of star-fish attack. Some ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/228342a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Triggering of the Stomach Eversion Reflex of Acanthaster planci by Coral Extracts (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 344-346 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] RECENT observations of Acanthaster planci populations in Micronesia suggest that the animal may eat certain corals in preference to others. The starfish feeds by everting its stomach and applying it to the coral surface. Neither the stimuli evoking stomach eversion nor the mechanism by which the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/228344a0
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    Paper (German National Licenses)
    Fulltext
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