Hydrobiologia

, Volume 286, Issue 2, pp 109–124

Coral and sea urchin assemblage structure and interrelationships in Kenyan reef lagoons

  • T. R. McClanahan
  • J. C. Mutere
Article

Abstract

Patterns of hard coral and sea urchin assemblage structure (species richness, diversity, and abundance) were studied in Kenyan coral reef lagoons which experienced different types of human resource use. Two protected reefs (Malindi and Watamu Marine National Parks) were protected from fishing and coral collection, but exposed to heavy tourist use. One reef (Mombasa MNP) received protection from fishermen for one year and was exploited for fish and corals prior to protection and was defined as a ‘transitional reef’. Three reefs (Vipingo, Kanamai, and Diani) were unprotected and experienced heavy fishing and some coral collection. Protected and unprotected reefs were distinct in terms of their assemblage structure with the transitional reef grouping with unprotected reefs based on relative and absolute abundance of coral genera. Protected reefs had slightly higher (p<0.01) coral cover (23.6 ± 8.3 % ± S.D.) than unprotected reefs (16.7 ± 8.5), but the transitional reef had the highest coral cover (30.8 ± 6.4) which increased by 250% since measured in 1987: largely attributable to a large increase inPorites nigrescens cover. Protected reefs had higher coral species richness and diversity and a greater relative abundance ofAcropora, Montipora andGalaxea than unprotected reefs. The transitional reef had high species richness, but lower diversity due to the high dominance ofPorites. Sea urchins showed the opposite pattern with highest diversity in most unprotected reefs. Coral cover, species richness, and diversity were negatively associated with sea urchin abundance, but the relative abundance ofPorites increased with sea urchin abundance to the point wherePorites composed >90% of the coral cover at sites with the highest sea urchin abundance. Effects of coral overcollection was only likely for the genusAcropora (staghorn corals). A combination of direct and indirect effects of human resource use may reduce diversity, species richness, and abundance of corals while increasing the absolute abundance of sea urchins and the relative cover ofPorites.

Key words

coral reefs community structure diversity human impacts marine parks species richness 

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References

  1. Bell, J. D. & R. Galzin, 1984. Influence of live coral cover on coral-reef fish communities. Mar. Ecol. Prog. Ser. 15: 265–274.Google Scholar
  2. Birkeland, C., 1988. The influence of echinoderms on coral-reef communities. Echin. Studies 3: 1–79.Google Scholar
  3. Borowitzka, M. A., 1983. Calcium carbonate deposition by reef algae: morphological and physiological aspects. In Barnes D. J. (ed.), Perspectives on coral reefs. Brian Clouster Publisher, Manuka, Australia: 16–28.Google Scholar
  4. Carpenter, R. C., 1981. Grazing byDiadema antillarum Philippi and its effects on the benthic algal community. J. mar. Res. 39: 749–765.Google Scholar
  5. Carpenter, R. C., 1988. Mass-mortality of a Caribean sea urchin: immediate effects on community metabolism and other herbivores. Proc. Natl. acad. Sci. 85: 511–514.Google Scholar
  6. Carpenter, R. C., 1990. Mass mortality ofDiadema antillarum: I. Long-term effects on sea urchin population-dynamics and coral reef algal communities. Mar. Biol. 104: 67–77.CrossRefGoogle Scholar
  7. Chalker, B. E., 1983. Calcification by corals and other animals on the reef. In Barnes D. J. (ed.), Perspectives on Coral Reefs. Brian Clouster Publishers, Manuka: 29–45.Google Scholar
  8. Clark, A. M. & F. W. E. Rowe, 1971. Monograph of the Shallow-Water Indo-West Pacific Echinoderms. Pitman Press, Bath, England.Google Scholar
  9. Connell, J. H., 1978. Diversity in tropical rain forests and coral reefs. Science 199: 1302–1310.Google Scholar
  10. Crame, J. A., 1981. Ecological stratification in the Pleistocene coral reefs of the Kenya Coast. Palaeontology 24: 609–646.Google Scholar
  11. Done, T. J., 1982. Patterns in the distribution of coral communities across the central great barrier reef. Coral Reefs 1: 95–107.CrossRefGoogle Scholar
  12. Duggings, D. O., C. A. Simenstad & J. A. Estes, 1989. Magnification of secondary production by kelp detritus in coastal marine ecosystems. Science 245: 170–173.Google Scholar
  13. Hamilton, H. G. H. & W. H. Brakel, 1984. Structure and coral fauna of East African reefs. Bull. mar. Sci. 34: 248–266.Google Scholar
  14. Hawkins, J. P. & C. M. Roberts, 1993. Effects of recreational scuba diving on coral reefs: trampling on reef-flat communities. J. appl. Ecol. 30: 25–30.Google Scholar
  15. Hay, M. E., 1984. Patterns of fish and urchin grazing on Caribbean coral reefs: are previous results typical? Ecology 65: 446–454.Google Scholar
  16. Hughes, T. P., D. C. Reed & M. J. Boyle, 1987. Herbivory on coral reefs: community structure following mass mortalities of sea urchins. J. exp. mar. Biol. Ecol. 113: 39–59.CrossRefGoogle Scholar
  17. Huston, M. A., 1985. Patterns of species diversity on coral reefs. Annu. Rev. Ecol. Syst. 16: 149–177.CrossRefGoogle Scholar
  18. Hutchings, P. A., 1986. Biological destruction of coral reefs: a review. Coral Reefs 4: 239–252.CrossRefGoogle Scholar
  19. Khamala, C. P. M., 1971. Ecology ofEchinometra mathaei Echinoidea: Echinodermata at Diani beach, Kenya. Mar. Biol. 2: 167–172.Google Scholar
  20. Kohn, A. J. & P. J. Leviten, 1976. Effect of habitat complexity on population density and species richness in tropical intertidal predatory gastropod assemblages. Oecologia 25: 119–210.CrossRefGoogle Scholar
  21. Levitan, D. R., 1988. Algal-urchin biomass responses following mass mortality ofDiadema antillarum Philippi at Saint John Virgin Islands. J. exp. mar. Biol. Ecol. 119: 167–178.CrossRefGoogle Scholar
  22. Luckhurst, B. E. & K. Luckhurst, 1978. Analysis of the influence of substrate variables on coral reef fish communities. Mar. Biol. 49: 317–323.CrossRefGoogle Scholar
  23. Ludwig, J. A. & J. F. Reynolds, 1988. Statistical Ecology: a primer on methods and computing. John Wiley & Sons, New York.Google Scholar
  24. McClanahan, T. R., 1988a. Coexistence in a sea urchin guild and its implications to coral reef diversity and degradation. Oecologia 77: 210–218.CrossRefGoogle Scholar
  25. McClanahan, T. R., 1988b. Seasonality in East Africa's coastal waters. Mar. Ecol. Prog. Ser. 44: 191–199.Google Scholar
  26. McClanahan, T. R., 1990a. Hierarchical control of coral reef ecosystems. PhD, University of Florida, Gainesville.Google Scholar
  27. McClanahan, T. R., 1990b. Kenyan coral reef-associated gastropod assemblages: distribution and diversity patterns. Coral Reefs 9: 63–74.CrossRefGoogle Scholar
  28. McClanahan, T. R., 1992a. Resource utilization, competition and predation: a model and example from coral reef grazers. Ecol. Mod. 61: 195–215.CrossRefGoogle Scholar
  29. McClanahan, T. R., 1992b. Epibenthic gastropods of the Middle Florida Keys: The role of habitat and environmental stress on assemblage composition. J. exp. mar. Biol. Ecol. 160: 169–190.CrossRefGoogle Scholar
  30. McClanahan, T. R., 1994. Kenyan coral reef lagoonal fishes: associations with reef management, substrate complexity, and sea urchins. Coral Reefs, in press.Google Scholar
  31. McClanahan, T. R. & J. D. Kurtis, 1991. Population regulation of the rock-boring sea urchinEchinometra matahei de Blainville. J. exp. mar. Biol. Ecol. 147: 121–146.CrossRefGoogle Scholar
  32. McClanahan, T. R. & N. A. Muthiga, 1988. Changes in Kenyan coral reef community structure due to exploitation. Hydrobiologia 166: 269–276.CrossRefGoogle Scholar
  33. McClanahan, T. R. & N. A. Muthiga, 1989. Patterns of predation on a sea urchin,Echinometra mathaei de Blainville, on Kenyan coral reefs. J. exp. mar. Biol. Ecol. 126: 77–94.CrossRefGoogle Scholar
  34. McClanahan, T. R. & S. H. Shafir, 1990. Causes and consequences of sea urchin abundance and diversity in Kenyan coral reef lagoons. Oecologia 83: 362–370.Google Scholar
  35. Moorjani, S. A., 1978. The Ecology of Marine Algae of the Kenyan Coast. University of Nairobi PhD, Kenya.Google Scholar
  36. Moran P. J., 1986. TheAcanthaster Phenomenon. Oceanogr. Mar. Biol. annu. Rev. 24: 379–480.Google Scholar
  37. Muthiga, N. A. & T. R. McClanahan, 1987. Population changes in the sea urchinEchinometra mathaei on an exploited fringing reef. Afr. J. Ecol. 25: 1–8.Google Scholar
  38. Neudecker, S., 1979. Effects of grazing and browsing fishes on zonation of corals in Guam. Ecology 60: 666–672.Google Scholar
  39. Randall, R. H. & R. F. Myers, 1983. Guide to the coastal resources of Guam. II. The Corals. University of Guam Press, Mangilao, Guam.Google Scholar
  40. Rohlf, F. J. & R. R. Sokal, 1969. Statistical Tables. W. H. Freeman & Co., San Francisco.Google Scholar
  41. Russ, G. R. & A. C. Alcala, 1989. Effects of intense fishing pressure on an assemblage of coral reef fishes. Mar. Ecol. Prog. Ser. 56: 13–27.Google Scholar
  42. Sammarco, P. W., 1980.Diadema and its relationship to coral spat mortality: grazing, competition, and biological disturbance. J. exp. mar. Biol. Ecol. 45: 245–272.CrossRefGoogle Scholar
  43. Sammarco, P. W., 1982. Echinoid grazing as a structuring force in coral communities: whole reef manipulations. J. exp. mar. Biol. Ecol. 61: 31–35.CrossRefGoogle Scholar
  44. Samoilys, M. A., 1988. Abundance and species richness of coral reef fish on the Kenyan Coast: The effects of protective management and fishing. Proc. 6th Int. Coral Reef Symp. 2: 261–266.Google Scholar
  45. Scoffin, T. P., C. W. Stearn, D. Boucher, P. Fryal, C. M. Hawkins, I. G. Hunter & J. K. MacGeachy, 1980. Calcium carbonate budget of a fringing reef on the west coast of Barbados II. Erosion, sediments and internal structure. Bull. mar. Sci. 30: 475–508.Google Scholar
  46. Smith, S. V., 1983. Coral reef calcification. In Barnes D. J. (ed.), Perspectives on Coral Reefs. Brian Clouster Publisher, Manuka: 240–247.Google Scholar
  47. Sokal, R. R. & F. J. Rohlf, 1981. Biometry (2nd Edition): 859. Freeman, New York.Google Scholar
  48. Veron, J. E. N., 1986. Corals of Australia and the Indo-Pacific. Angus & Robertson Publishers, London.Google Scholar
  49. Veron, J. E. N. & M. Pichon, 1976. Scleractinia of Eastern Australia Part 1. Australian Government Publishing Service, Canberra.Google Scholar
  50. Veron, J. E. N. & M. Pichon, 1980. Scleractinia of Eastern Australia: Part 3. Australian National University Press, Canberra.Google Scholar
  51. Veron, J. E. N. & M. Pichon, 1982. Scleractinia of Eastern Australia: Part 4. Australian National University Press, Canberra.Google Scholar
  52. Veron, J. E. N., M. Pichon & M. Wijsman-Best, 1977. Scleractinia of Eastern Australia: Part 2. Australian Government Publishing Service, Canberra.Google Scholar
  53. Veron, J. E. N. & C. C. Wallace, 1984. Scleractinia of Eastern Australia: Part 5. Australian National University Press, Canberra.Google Scholar
  54. Walters, C. J. & C. S. Holling, 1990. Large-scale management experiments and learning by doing. Ecology 71: 2060–2068.Google Scholar
  55. Wellington, G. M., 1982. Depth zonation of corals in the Gulf of Panama: control and facilitation by resident reef fishes. Ecol. Monogr. 52: 223–241.Google Scholar
  56. Wells, S. M., 1981. International trade in ornamental corals and shells. Proc. 4th Int. Coral Reef Symp. 1: 323–330.Google Scholar
  57. Wells, S. M. & A. C. Alcala, 1987. Collecting of corals and shelsl. In Salvat B. (ed.), Human Impacts on Coral Reefs: Facts and Recommendations. Antenne de Tahiti Museum E.P.H.E., French Polynesia: 13–27.Google Scholar
  58. Woodland, D. J. & J. N. A. Hooper, 1977. The effect of trampling on coral reefs. Biol. Conserv. 11: 1–4.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • T. R. McClanahan
    • 1
  • J. C. Mutere
    • 2
  1. 1.NYZS - The Wildlife Conservation SocietyCoral Reef Conservatin ProjectMombasaKenya
  2. 2.Kenya Marine & Fisheries Research InstituteMombasaKenya

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