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Coral Photobiology Article Abstract

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  • Coral Photobiology Article Abstract

    Greetings All !

    Just FYI ranting ...

    I haven't read the article yet, but I thought some of us might be interested in the abstract ...

    Journal of Phycology
    Volume 41 Issue 2 Page 335 - April 2005
    doi:10.1111/j.1529-8817.2005.04034.x


    CORAL PHOTOBIOLOGY STUDIED WITH A NEW IMAGING PULSE AMPLITUDE MODULATED FLUOROMETER1
    Peter J. Ralpha2, Ulrich Schreiberb, Rolf Gademannc, Michael Kühld and Anthony W. D. Larkume
    A new high-resolution imaging fluorometer (Imaging-PAM) was used to identify heterogeneity of photosynthetic activity across the surface of corals. Three species were examined: Acropora nobilis Dana (branching), Goniastrea australiensis Edwards & Haime (massive), and Pavona decussata Dana (plate). Images of fluorescence parameters (F, Fm', effective quantum yield, optimal quantum yield, electron transport rate, relative photosynthetic rate, and non-photochemical quenching) allowed heterogeneity to be detected in terms of position on colony and indicated that the photosynthetic activity of polyp and coenosarc tissues responded differently to changing light for all three species. The Imaging-PAM offers a special routine, with which images of PAR absorption (absorptivity) are obtained. In this way, for the first time it has become possible to derive images of the relative photosynthesis rate. Polyps had a lower PAR absorptivity than coenosarc tissue for A. nobilis and P. decussata, whereas G. australiensis showed the opposite pattern. Acropora nobilis showed heterogeneity along the longitudinal axis of the branch, which could be differentiated from the effect of variations in illumination across the rugose and curved surface. Diel changes were apparent and influenced the longitudinal heterogeneity along the A. nobilis branch. Images were also obtained showing the degree of photoinhibition caused by high-light stress across a coral surface at a hitherto unobtainable level of resolution.

    Abstract from:
    Journal of Phycology: Volume 41, Issue 2, Apr 2005
    The above issue is now available online from Blackwell Synergy at:
    http://www.blackwell-synergy.com/links/toc/jpy/41/2
    What jumped out at me was ...

    ... ...

    ... No ... Actually, it was the following quotes ...

    Images of fluorescence parameters (F, Fm', effective quantum yield, optimal quantum yield, electron transport rate, relative photosynthetic rate, and non-photochemical quenching) allowed heterogeneity to be detected in terms of position on colony and indicated that the photosynthetic activity of polyp and coenosarc tissues responded differently to changing light for all three species.
    Now they can take "pictures" of the energy processes of coral growth ... WAY cool! Apparently, it turns out that different tissue regions respond to light differently ... AND differently between coral species. Just when we thought we were finally getting a handle on the concept of reef lighting ...

    ... damn ...

    The Imaging-PAM offers a special routine, with which images of PAR absorption (absorptivity) are obtained. In this way, for the first time it has become possible to derive images of the relative photosynthesis rate.
    This has the potential of forcing us to re-examine, and to re-educate ourselves about almost everything we "know" about coral growth patterns ...

    ... damn ...

    Images were also obtained showing the degree of photoinhibition caused by high-light stress across a coral surface at a hitherto unobtainable level of resolution.
    Finally, a technique with the potential to provide data which could answer the eternal question, "Is there such a thing as TOO much light?" ...

    ... way cool ...

    Just trying to fill in the data set ...

    Sorry ... had to be done ...

    JMO ... FWIW.
    "When the going gets weird, the weird turn pro."
    Hunter S. Thompson

  • #2
    yeah is there gonna be a follow up on this ?
    Nick
    Nick
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