Literature request for Palythoa/scleractinian interaction
thomassi at com.univ-mrs.fr
Mon May 29 06:56:56 EDT 2000
Competition between brown Palythoa crops and corals is very common in
many reefs submitted to a sort of eutrophication, with input of
dissolved organic matter on reef flats (mostly outer reef fronts)
bathed by laminar currents.
I saw several good examples in different regions :
- Today, after the huge anthropogenic impact on the barrier reef
outer flat of Tuléar (south-west Malagasy) a belt of Palythoa of
several kilometers long and 30-50 m large overlaps the Acroporid
upper outer slope community (emerging at spring low tides). Before
between 1960-72, Michel PICHON et others we described this beautiful
coral assemblage of the tops of the spurs of the outer front.
- In New Caledonia in some reefs in front and close to Nouméa town I
observed those patches on reefs located at the middle of passage of
close to nickel factory of Doniambo in a canal with hotter seawater.
- In Mauritius, close to the opening of a non-treated industrial and
urban sewage I observed such patches on the outer barrier reef front
(always at the level of the small brakers).
- I have also example in the Mururoa atoll (but its is secret)...
My opinion is that the brown Palythoa (P. capensis and P. liscia at
Tulear)(see the Ch. HERBERTS's paper of 1972, in Marine Biology, 13
(2) : 127-136) outbreak overlaying the corals in the outer reef front
(quiet well exposed) where organic matter content in the water
increases. They are associated with a step of the eutrophisation of
Bernard A. THOMASSIN
thomassi at com.univ-mrs;fr
Centre d'Oceanologie de Marseille,
Station Marine d'Endoume,
rue de la Batterie des Lions,
tél. (33) 04 91 0416 17
tél. GSM 06 63 14 91 78
fax. (33) 04 91 04 16 35 (à l'attention de...)
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