, Volume 71, Issue 1, pp 29–37 | Cite as

Diversity and spatial pattern of coral communities in the Red Sea upper twilight zone

  • H. W. Fricke
  • B. Knauer
Original Papers


This is the first study based on numerical analysis of the abundance of 11 scleractinian corals of depths at between 100–210 m in the Red Sea twilight zone. Two distinct coral communities were found: a Leptoseris fragilis community at a depth of 100–130 m (zone 1) and a Dendrophillia horsti community below 130 m (zone 2, 3). Population densities and coral coverage are very low; distribution of individuals is highly clumped. Highest observed densities on 100 m2 were 2720 individuals for L. fraglis, 2720 for D. horsti and 2260 for Javania insignis. Calculated coverage rates were maximally 3.6% (L. fragilis), 0.08% (D. horsti) and 0.11% (J. insignis). L. fragilis, the only symbiont bearing coral, was very abundant. It has an unusual depth range for a photosynthesising coral. Coral density is only weakly correlated with hard bottom coverage. Species diversity with an average of 8 species is highest at 120–170 m and decreases in shallower and deeper water. The study depth range is a transient zone for coral distribution. It contains the upper distribution limits of a few “deep sea” corals and the lower ones of several shallower water species. Ahermatypic corals, collected at 160–170 m depth, were transplanted from their original depth to 159, 118, 70 and 40 m; after one year most species survived transplantation far beyond their upper distributional limits. The symbiotic L. fragilis, collected at 120 m, survived transplantation to deep water (159 m) as well as shallow zones (90, 70 and 40 m). The study demonstrates the feasibility of line-transect methods for coral community studies with a submersible.

Key words

Red Sea Corals Twilight zone Symbiosis 


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  1. Bright TJ, Kraemer GP, Minnery GA, Viada ST (1984) Hermatyps of the Flower Garden Banks, Northwestern Gulf of Mexico: a comparison to other Western Atlantic Reefs. Bull Mar Sci 34:461–476Google Scholar
  2. DeGhett VJ (1978) Hierarchical cluster analysis. In: Colgan RW (ed) Quantiative Ethology. Wiley and Sons, New York, pp 115–144Google Scholar
  3. Dodge RE, Logan A, Antonius A (1982) Quantitative reef assessment studies in Bermuda: A comparison of methods and preliminary results. Bull Mar Sci 32:745–760Google Scholar
  4. Dollar SJ (1982) Wave stress and coral community structure in Hawai. Coral Reefs 1:71–81Google Scholar
  5. Done TJ (1982) Patterns in the distributions of coral communities across the central Great Barrier Reef. Coral Reefs 1:95–107Google Scholar
  6. Fricke HW, Meischner D (1985) Depth limits of Bermudan scleractinian corals: a submersible survey. Mar Biol 88:175–187Google Scholar
  7. Fricke HW, Schuhmacher H (1983) The depth limits of Red Sea stony corals: an ecophysiological problem (a deep diving survey by submersible). PSZNI Mar Ecol 4:163–194Google Scholar
  8. Ginsburg RN, James NP (1973) British Honduras by submarine. Geotimes 18:23–24Google Scholar
  9. Goodwin MH, Cole MJC, Steward WE, Zimmermann BL (1976) Species density and associations in Caribbean reef corals. J Exp Mar Biol Ecol 24:19–31Google Scholar
  10. Graus RR, MacIntyre IG, Herchenroder BE (1984) Computer simulation of the reef zonation at Discovery Bay, Jamaica: Hurricane disruption and long-term physical oceanographic controls. Coral Reefs 3:59–68Google Scholar
  11. Jaap WC (1981) Stony corals (Milleporina and scleractinia). In: Jameson SC (ed) Key largo coral reef national marine sanctuary deep water resource survey. NOAA Technical Report CZ/SP 1, pp 7–13Google Scholar
  12. James NP, Ginsburg RG (1979) The seaward margin of Belize barrier and atoll reefs. Int Ass Sediment Spec Publ 3:1–191Google Scholar
  13. Klinker J, Reiss Z, Kropach C, Levanon I, Harpaz H, Shapiro Y (1978) Nutrients and biomass distribution in the Gulf of Aqaba, (Elat), Red Sea Mar Biol 45:53–64Google Scholar
  14. Lang J (1974) Biological zonation at the base of a reef. Am Sci 62:272–281Google Scholar
  15. Loya Y (1972) Community structure and species diversity of hermatypic corals at Eilat, Red Sea. Mar Biol 13:100–123Google Scholar
  16. Loya Y (1978) Plotless and transect methods. In: Stoddart DR, Johannes RE (eds) Coral reefs: research methods. UNESCO, pp 197–217Google Scholar
  17. Maragos JE (1974) Coral communities on a seaward reef slope? Fanning Island Pac Sci 28:257–258Google Scholar
  18. Marenzeller EV (1906) Tiefseekorallen (Expedition Pola in das Rote Meer 1895/96–1897/98). Denkschr Math Naturwiss Kl Kaiserl Akad Wiss Wien 80:13–25Google Scholar
  19. Mergner H (1981) Man-made influences on and natural changes in the settlement of the Aqaba reefs (Red Sea). Proc Fourth Int Cor Reef Sym Manila Vd. 1:133–207Google Scholar
  20. Mergner H, Schuhmacher H (1974) Morphologie, Ökologie und Zonierung von Korallenriffen bei Aqaba, (Golf von Aqaba, Rotes Meer). Helgoländer wiss Meeresunters 26:238–358Google Scholar
  21. Odum EP (1971) Fundamentals of ecology. Saunders Company, Philadelphia-Toronto 574Google Scholar
  22. Ott B, Auclair B (1977) Cluster-analytic definition of species ecological groups for a submerge barrier reef in Barbados, West Indies. Int Revue Ges Hydrobiol 62:41–51Google Scholar
  23. Porter J (1972) Patterns of species diversity in Caribbean reef corals. Ecology 53:745–748Google Scholar
  24. Porter J (1974) Ecology and species diversity of coral reefs on opposite sides of the Ithmus of Panama. Bull Biol Sco Wash 2:89–116Google Scholar
  25. Reed JK (1980) Distribution and structure of deep water Oculina varicosa reefs off Central Eastern Florida. Bull Mar Sci 30:667–677Google Scholar
  26. Reiss Z, Hottinger L (1984) The Gulf of Aqaba. Ecological Micropaleontology. Ecological studies 50:353, Springer Berlin, Heidelberg, TokyoGoogle Scholar
  27. Scheer G, Pillai CSG (1983) Report on the stony corals from the Red Sea. Zoologica 133:1–190Google Scholar
  28. Schlichter D, Fricke HW, Weber W (1986) Light harvesting by wavelength transformation in a symbiotic coral of the Red Sea twilight zone. Mar Biol (in press)Google Scholar
  29. Schuhmacher H, Zibrowius H (1985) What is hermatypic? A redefinition of ecological groups in corals and other organisms. Coral Reefs 4:1–9Google Scholar
  30. Sheppard CRC (1980) Coral cover, zonation and diversity of reef slopes of Chagos Atolls, and population structures of the major species. Mar Ecol Prog Ser 2:193–205Google Scholar
  31. Sheppard CRC (1982) Coral populations on reef slopes and their major controls. Mar Ecol Prog Ser 7:83–115Google Scholar
  32. Siegel S (1956) Nonparametric statistics. McGraw Hill, KogakushaGoogle Scholar
  33. Sokal RR, Rohlf FJ (1969) Biometry. Freeman and Company, San Francisco 776Google Scholar
  34. Walker DI, Ormond RFG (1982) Coral death from sewage and phosphate pollution at Aqaba (Red Sea). Mar Poll Bull 13:21–25Google Scholar
  35. Wallace CC, Dale MB (1977) An information analysis approach to zonation pattern of the coral genus Acropora on outer reef buttresses. Atoll Res Bull 220:95–110Google Scholar
  36. Yamazato K (1972) Bathymetric distribution of corals in the Ryukyu Islands. Proc Symp Corals and Coral Reefs, 1969, Mar Biol Assoc India 121–133Google Scholar
  37. Zar JH (1974) Biostatistical analysis. Prentice Hall, Inc. Englewood Cliffs, New YorkGoogle Scholar

Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • H. W. Fricke
    • 1
  • B. Knauer
    • 2
  1. 1.Max-Planck-Institut für VerhaltensphysiologieSeewiesenGermany
  2. 2.Heizz-Steinitz-Marine LaboratoryEilatIsrael

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