, Volume 530, Issue 1–3, pp 423–432 | Cite as

Morphological and genetic variation across reef habitats in a broadcast-spawning octocoral

  • Elizabeth Kim
  • Howard R. Lasker
  • Mary Alice Coffroth
  • Kiho KimEmail author


Octocorals, like many other colonial benthic invertebrates, exhibit remarkable levels of morphological variability. The basis for this variability has been largely unexplored. Plexaura flexuosa Lamouroux, a common Caribbean octocoral, is found in virtually all reef habitats, and exhibits habitat-related differences in growth rates and fecundity. Population genetic structure and morphological variability in branch and sclerite characters were examined in nine populations from back reef, shallow forereef, and forereef habitats in the Florida Keys. Discriminant analysis of morphological characters correctly classified 89, 88, and 100% of samples from back, shallow fore, and forereef habitats, respectively. Analysis of randomly amplified polymorphic DNA profiles (RAPDs) showed no evidence of genetic differentiation between shallow back, shallow fore, and the majority of forereef colonies. However, there were two distinct genetic groups of forereef colonies. Much of the habitat-related morphological variability among Plexaura flexuosa is due to plasticity, which is likely an important feature contributing to the broad distribution of this species. However, there may be two genetic subgroups on forereefs.


gorgonian phenotypic plasticity ecotypic variation RAPDs coral reef 


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  1. Ayre, D. J., Hughes, T. P. 2000Genotypic diversity and gene flow in brooding and spawning corals along the Great Barrier Reef, AustraliaEvolution5415901605PubMedGoogle Scholar
  2. Ayre, D. J., Willis, B. L. 1988Population structure in the coral Pavona cactus: clonal genotypes show little phenotypic plasticityMarine Biology99495505CrossRefGoogle Scholar
  3. Barnes, D. J. 1973Growth in colonial scleractiniansBulletin of Marine Science23280298Google Scholar
  4. Bastidas, C., Benzie, J. A. H., Uthicke, S., Fabricius, K. E. 2001Genetic differentiation among populations of a broadcast spawning soft coral, Sinularia flexibilis, on the Great Barrier ReefMarine Biology138517525CrossRefGoogle Scholar
  5. Bayer, F. M. 1961The Shallow-Water Octocorallia of the West Indian RegionMartinus NijhoffThe Hague373Google Scholar
  6. Beiring, E. A. 1997Life History and Reproductive Success of a Broadcast-Spawning Gorgonian Coral and Implication for Conservation BiologyUniversity of BuffaloBuffalo137Google Scholar
  7. Beiring, E. A., Lasker, H. R. 2000Egg production by colonies of a gorgonian coralMarine Ecology Progress Series196169177Google Scholar
  8. Brakel, W. H. 1977Corallite variation in Porites and the species problem in coralsProceedings of the Third International Coral Reef Symposium1457462Google Scholar
  9. Brakel, W. H. 1983Depth-related changes in the colony form of the reef coral Porites asteroidesReaka-Kudla, M. L. eds. The Ecology of Deep and Shallow Coral Reefs. US Department of CommercePhiladelphia2126Google Scholar
  10. Brazeau, D. A., Harvell, C. D. 1994Genetic structure of local populations and divergence between growth forms in a clonal invertebrate, the Caribbean octocoral Briareum asbestinumMarine Biology1195360CrossRefGoogle Scholar
  11. Bruno, J. F., Edmunds, P. J. 1997Clonal variation for phenotypic plasticity in the coral Madracis mirabilisEcology7821772190Google Scholar
  12. Carlon, D. B., Budd, A. F. 2002Incipient speciation across a depth gradient in a scleractinian coralEvolution5622272242PubMedGoogle Scholar
  13. Coffroth, M. A., Lasker, H. R. 1998Larval paternity and male reproductive success of a broadcast-spawning gorgonian, Plexaura kunaMarine Biology131329337CrossRefGoogle Scholar
  14. Coffroth, M. A., Lasker, H. R., Diamond, M. E., Bruenn, J. A., Bermingham, E. 1992DNA fingerprints of a gorgonian coral: a method for detecting clonal structure in a vegetative speciesMarine Biology114317325CrossRefGoogle Scholar
  15. Coffroth, M. A., Mulawka, J. M. 1995Identification of marine invertebrate larvae by means of PCR-RAPD species-specific markersLimnology and Oceanography40181189CrossRefGoogle Scholar
  16. Davies, P. S. 1977Carbon budgets and vertical zonation of Atlantic reef coralsProceedings of the 3rd International Coral Reef Symposium1391396Google Scholar
  17. Dustan, P. 1975Growth and form in the reef-building coral Montastrea annularisMarine Biology33101107CrossRefGoogle Scholar
  18. Excoffier, L., Smouse, P. E., Quattro, J. M. 1992Analysis of molecular variance inferred from metric distances among DNA haplotype: application to human mitochondrial DNA restriction sitesGenetics131479491PubMedGoogle Scholar
  19. Foster, A. B. 1979Phenotypic plasticity in the reef corals Montastrea annularis (Ellis & Solander) and Siderastrea siderea (Ellis & Solander)Journal of Experimental Marine Biology and Ecology392554CrossRefGoogle Scholar
  20. Goldberg, W. M. 1973The ecology of the coral-octocoral communities off the southeast Florida coast: geomorphology, species composition, and zonationBulletin of Marine Science23465488Google Scholar
  21. Goreau, N., Goreau, T., Hayes, R. 1981Settling, survivorship and spatial aggregation in planulae and juveniles of the coral Porites porites (Pallas)Bulletin of Marine Science31424435Google Scholar
  22. Graus, R. R., Macintyre, I. G. 1976Light control of growth forms in colonial reef corals: computer simulationScience193895897PubMedGoogle Scholar
  23. Grigg, R. W. 1972Orientation and growth form of sea fansLimnology and Oceanography17185192CrossRefGoogle Scholar
  24. Halpern, B. S., Warner, R. R. 2002Marine reserves have rapid and lasting effectsEcology Letters5361366CrossRefGoogle Scholar
  25. Helmuth, B. S. T., Sebens, K. P., Daniel, T. L. 1997Morphological variation in coral aggregations: branch spacing and mass flux to coral tissuesJournal of Experimental Marine Biology and Ecology209233259CrossRefGoogle Scholar
  26. Hudson, J. H. 1981Growth rates in Montastrea annularis: a record of environmental change in Key Largo coral reefs marine sanctuaryBulletin of Marine Science31444459Google Scholar
  27. Kim, K., Lasker, H. R. 1998Allometry of resource capture in colonial cnidarians and constraints on modular growthFunctional Ecology12646654CrossRefGoogle Scholar
  28. Kinzie, R. A.,III 1973The zonation of West Indian gorgoniansBulletin of Marine Science2393155Google Scholar
  29. Kjolner, S., Sastad, S. M., Taberlet, P., Brochmann, C. 2004Amplified fragment length polymorphism versus random amplified polymorphic DNA markers: clonal diversity in Saxifraga cernuaMolecular Ecology138186CrossRefPubMedGoogle Scholar
  30. Knowlton, N. 1993Sibling species in the seaAnnual Review of Ecology and Systematics25189216Google Scholar
  31. Knowlton, N., Jackson, J. B. C. 1994New taxonomy and niche partitioning on coral reefs: Jack of all trades or master of someTrends in Ecology & Evolution979Google Scholar
  32. Knowlton, N., Mate, J. L., Guzmán, H. M., Rowan, R., Jara, J. 1997Direct evidence for reproductive isolation among the three species of the Montastraea annularis complex in Central America (Panamá and Honduras)Marine Biology127705711CrossRefGoogle Scholar
  33. Lasker, H. R. 1981Phenotypic variation in the coral Montastrea cavernosa and its effects on colony energeticsBiological Bulletin160292302Google Scholar
  34. Lasker, H. R., Coffroth, M. A. 1983Octocoral distribution at Carrie Bow Cay, BelizeMarine Ecology Progress Series132128Google Scholar
  35. Lesser, M. P., Weis, V. M., Patterson, M. R., Jokiel, P. L. 1994Effects of morphology and water motion on carbon delivery and productivity in the reef coral, Pocillopora damicornis (Linnaeus): diffusion barriers, inorganic carbon limitation, and biochemical plasticityJournal of Experimental Marine Biology and Ecology178153179CrossRefGoogle Scholar
  36. McFadden, C. S. 1986Colony fission increases particle capture rates of a soft coral: advantages of being a small colonyJournal of Experimental Marine Biology and Ecology103120CrossRefGoogle Scholar
  37. Miller, K. J. 1994Morphological variation in the coral genus Platygra: environmental influences and taxonomic implicationsMarine Ecology Progress Series1101928Google Scholar
  38. Nei, M., Li, W.-H. 1979Mathematical model for studying genetic variation in terms of restriction endonucleasesProceedings of the National Academy of Sciences of the USA7652695273PubMedGoogle Scholar
  39. Oliver, J. K., Chalker, B. E., Dunlap, W. C. 1983Bathymetric adaptations of reef-building corals at Davies Reef, Great Barrier Reef, Australia. I. Long-term growth responses of Acropora formosa (Dana 1846).Journal of Experimental Marine Biology and Ecology731135CrossRefGoogle Scholar
  40. Palumbi, S. R. 2002Marine Reserves: A Tool for Ecosystem Management and ConservationPew Ocean CommissionArlington51Google Scholar
  41. Potts, D. C. 1978Differentiation in coral populationsAtoll Research Bulletin2205574Google Scholar
  42. Potts, D. C. 1984Natural selection in experimental populations of reef-building corals (Scleractinia)Evolution3810591078Google Scholar
  43. Ridgway, T., Hoegh-Guldberg, O., Ayre, D. J. 2001Panmixia in Pocillopora verrucosa from South AfricaMarine Biology139175181Google Scholar
  44. Rowan, R., Knowlton, N. 1995Intraspecific diversity and ecological zonation in coral-algal symbiosisProceedings of the National Academy of Sciences of the USA9228502853PubMedGoogle Scholar
  45. Schneider, S., Roesseli, D., Excoffier, L. 2000Arlequin ver 2. 000: A Software for Population Genetic Data Analysis.Genetics and Biometry Laboratory, University of GenevaGenevaGoogle Scholar
  46. Sebens, K. P. 1984Water flow and coral colony size: interhabitat comparisons of the octocoral Alcyonium sideriumProceedings of the National Academy of Sciences of the USA8154735477PubMedGoogle Scholar
  47. Stobart, B., Benzie, J. A. H. 1994Allozyme electrophoresis demonstrates that the scleractinian coral Montipora digitata is two speciesMarine Biology118183190CrossRefGoogle Scholar
  48. Takabayashi, M., Hoegh-Guldberg, O. 1995Ecological and physiological differences between two colour morphs of the coral Pocillopora damicornisMarine Biology123705714CrossRefGoogle Scholar
  49. Tureson, G. 1922The genotypic response of plant species to the habitatHereditas3211350Google Scholar
  50. Veghel, M. L. J., Bak, R. P. M. 1993Intraspecific variation of a dominant Caribbean reef building coral, Montastrea annularis: genetic, behavioral and morphometric aspectsMarine Ecology Progress Series92255265Google Scholar
  51. Velimirov, B. 1976Variations in growth forms of Eunicella cavolinii Koch (Octocorallia) related to intensity of water movementJournal of Experimental Marine Biology and Ecology21109117CrossRefGoogle Scholar
  52. Weil, E., Knowlton, N. 1994A multi-character analysis of the Caribbean coral Montastrea annularis (Ellis and Solander, 1786) and its two sibling species, Mfaveolata (Ellis and Solander,1786) and M. franksi (Gregory, 1895). Bulletin of Marine Science 55151175Google Scholar
  53. West, J. M., Harvell, C. D., Walls, A. M. 1993Morphological plasticity in a gorgonian coral (Briareum asbestinum) over a depth clineMarine Ecology Progress Series946169Google Scholar
  54. Wijsman-Best, M. 1974Habitat-induced modification of reef corals (Favidae) and its consequences for taxonomyProceedings of the2nd International Coral Reef Symposium 2217228Google Scholar
  55. Willis, B. L., Ayre, D. J. 1985Asexual reproduction and genetic determination of growth form in the coral Pavona cactus: biochemical genetic and immunogenetic evidenceOecologia65516525CrossRefGoogle Scholar
  56. Wood-Jones, F., 1907. On the growth forms and supposed species in corals. Proceedings of the Royal Society of London: 518--556.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Elizabeth Kim
    • 1
    • 2
  • Howard R. Lasker
    • 1
  • Mary Alice Coffroth
    • 1
  • Kiho Kim
    • 3
    Email author
  1. 1.Department of Biological SciencesUniversity at BuffaloBuffaloUSA
  2. 2.U.S. Environmental Protection Agency (4504T)Washington, DCUSA
  3. 3.Department of BiologyAmerican UniversityWashington, DCUSA

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