Coral bioherms below the euphotic zone in the Red Sea

Abstract
During exploration of the narrow western shelf in the Gulf of Aqaba by means of the research submersible ''GEO'', bioherms formed by the stony coral Madracis interjecta were discovered between 120 m and at least 200 m depth. The growth of the bioherms is supposed to be linked to the particularly warm-temperature regime of the Gulf of Aqaba; distribution depends probably on current patterns (providing nutrients), submarine topography and availability of hard substrate. The absence of symbiotic algae below the euphotic zone does not hamper the building of bioherms by stony corals. The Madracis-bioherms are true reefs in as much as the bioherms are surrounded by selected detrific facies types similar to ordinary, sheltered patch reefs in the photic zones.

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