Is it true???
Bernard.Thomassin at com.univ-mrs.fr
Mon Jun 11 09:44:07 EDT 2001
To answer to your question :
>"Is it true that "the 1997-98 El Nino killed 70% of all corals in the
I can assume that, for Mayotte Island (Comoro Archip.), located
the middle of the north of the Mozambique Channel, observations
before (April-June 1998) and following the establisment of the
Reef Observatory" (surveys in Dec. 1998, 1999, 2000), show that
the outer barrier reef slope, about 80 percent and in place more
the living corals between 3 and 15-20 m depth died following the
period of oceanic seawater bathing the island (mean weekly ocean
seawater temperature >31°C and reaching 32°C). The genera more
affected were : Pocilloporids, tabular and branched Acroporids,
Diploastrea, massive Porites also bleached but partly recovered.
Bleaching occured during more 3 months (April to June 1998).
Even encrusting platy corals at 25-35 m deep were bleached in
Even the soft corals (Sarcophyton cf. glaucum, Sinularia)
and regressed in size.
As it was observed the coral communities living in fringing reefs
coastal bays (more turbid and warm environments) less suffered
corals living in clear waters on the outer slopes of the barrier
Huge bleaching also occured in Aldabra atoll (see Abstracts of
ISRS 1998 Meeting at Perpignan).
People gave me observations from some of the Maldivian atolls. On
slopes there, about 70-80 percent also of the coral coverage
have some pictures.
If you have results from your enquiry from the West Indian Ocean
coral reefs I ma interested for comparisons.
Bernard A. THOMASSIN
Dir. recherches CNRS
Centre d'Océanologie de Marseille,
Station marine d'Endoume,
Chemin de la batterie des Lions,
"Environnement marin & littoral de
l'île de Mayotte"
tél. (33) 04 91 04 16 17 (ligne directe)
(33) 04 91 04 16 00 (standart)
mobile (33) 06 63 14 91 78
fax (33) 04 91 04 16 35 (à l'attention de....)
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