Julian Sprung's email.
jamaluddin.jompa at jcu.edu.au
Wed Aug 30 21:12:15 EDT 2000
Dear Jonathan Kelsey and Coral listers,
I am interested in your suggestion on the possibility of macroalgal shading
the effect of bleaching on corals (point 2 below). During the 1998 mass
event, on the inshore reefs of the GBR, we observed relatively lower rate
corals in control plots where macroalgal (mainly Sargassum)canopy were left
and ~ 1 m high) compared to plots where the canopy had been experimentally
removed. I would
be pleased to hear more information about this phenomenon.
The preliminary result can be seen on
At 08:52 25/08/00 -0400, Jonathan Kelsey wrote:
>I am very interested further discussion of these theories raised in Mr.
>1.) "Mass coral bleaching and subsequent coral death has nothing
>do with starvation. Nor is water pollution a factor. It is simply hot
>light that combined do the damage. The corals in a hot spot may bleach and
>in a matter of just a few days. Corals don't starve so quickly."
>2.) "Also, when you find survivors of bleaching events they tend to be in
>polluted (nutrient rich) habitats. That can be explained at least partly
>fact that these habitats have lower light penetration due to turbidity and
>also have shading caused by growths of macroalgae."
>-Are these generally accepted concepts?
>-Can one accurately assess coral mortality rates associated with a bleaching
>event after "a matter of just a few days"?
>-Are there quantitative studies showing that there is a greater bleaching
>survival rate among corals in polluted waters versus those in non-polluted
>-Any comments and/or further discussion would be greatly appreciated.
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