This is the paper that I brought in today:
Wild, FJ; Jones, AC; Tudhope, AW:Investigation of luminescent banding in solid coral: the contribution of phosphorescence (2000).Coral Reefs 19:2, pp132—140.
I tried to find a good picture to answer Kristen's question about what the bands actually are (sorry for not getting around to it before we all left!), and I came across this excellent page from the Australian Antarctic Division's website. Look at the third picture on the page!
Ack: Try searching for trees rings photophysics, and see if it's as cool as coral..
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Thanks Tomas - I think that does answer my question about the "banding" of the corals. The fact that the luminescence is due to phosphorescence is really interesting since that means the excited states will be relatively long lived (they quote something of the order of seconds in the paper). I really enjoyed that paper, thanks Tomas!
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