[Coral-List] Coral Polyps Rejecting/Ejecting Their Zooxanthellae
dustanp at cofc.edu
Thu Jan 31 19:54:25 EST 2008
For another perspective check out:
Downs, C.A., J.E. Fauth, J.C. Halas, P. Dustan,J. Bemiss,and C. Woodley.
2002. Oxidative stress and seasonal coral bleaching. Free Radical
Biology and Medicine, 33:4 pp533-543.
Suggests that zoox are expelled by their hosts as a last resort
because they become too much of a metabolic burden - virtually toxic
with too much oxygen....
Thomas Goreau wrote:
> Dunbar Steele and Nora Goreau found that degenerating and excess
> zooxanthellae are often expelled rather than absorbed.
> This fits with most coelenterates being obligate carnivores in diet,
> even those with symbiotic algae. Sir Maurice Yonge pointed out in the
> 1920s Reports of the Cambridge University Great Barrier Reef
> Expedition that corals spat out phytoplankton put in their gastric
> cavity but gobbled up zooplankton. In addition corals have many other
> heterotropic uptake pathways. For more on this see:
> TF Goreau, 1956, A study of the biology and histochemistry of corals,
> 227 p., Yale University
> TF Goreau, NI Goreau, and CM Yonge, 1971, Reef corals: autotrophs or
> heterotrophs? Biol. Bull. 141:247-260
> Thomas J. Goreau, PhD
> Global Coral Reef Alliance
> 37 Pleasant Street, Cambridge MA 02139
> goreau at bestweb.net
> On Jan 31, 2008, at 4:34 PM, James Cervino PhD. wrote:
>> There was a great paper published by Roger Steele and Nora Goreau
>> in 1977 that
>> discusses "farming of the alga". Here is the citation.
>> Steele, R.D. and N. Goreau, (1977). The breakdown of symbiotic
>> zooxanthellae in
>> the sea anemone Phyllactis (=Oulactis) flosculifera (Actiniara). J.
>> Zool. Lond.
>> 181: 421-437.
>> Dr. James M. Cervino
>> Pace University & Visiting Scientist
>> Woods Hole Oceanographic Inst.
>> Department of Marine Chemistry
>> Woods Hole MA.
>> Cell: 917-620*5287
>> Quoting Melissa Keyes <mekvinga at yahoo.com>:
>> * Hello, Listers,
>> * Do stressed Polyps eject their Zooxanthellae because the Zoox
>> are dying or
>> * have died, and are beginning to rot?
>> * Cheers,
>> * Melissa E. Keyes
>> * Christiansted, St. Croix, USVI
>> * Caribbean Sea
>> * ---------------------------------
>> * Looking for last minute shopping deals? Find them fast with
>> Yahoo! Search.
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