Coral Reefs

, Volume 29, Issue 2, pp 393–397 | Cite as

Charismatic microfauna alter cyanobacterial production through a trophic cascade

  • S. W. GeangeEmail author
  • A. C. Stier


The trophic ecology of cyanobacterial blooms is poorly understood on coral reefs. Blooms of toxic cyanobacteria, Lyngbya majuscula, can quickly form large mats. The herbivorous sea hare, Stylocheilus striatus, and the predatory nudibranch, Gymnodoris ceylonica, often associate with these blooms, forming a linear food chain: nudibranch—sea hare—cyanobacteria. Using laboratory studies, this study quantified (1) the functional response of nudibranchs, (2) the effect of sea hare size on predation rates, and (3) the strength of the indirect effect of sea hare predation on cyanobacteria (i.e., a trophic cascade). Nudibranchs consumed on average 2.4 sea hares d−1, with the consumption of small sea hares 22 times greater than the consumption of large sea hares. Predation of sea hares reduced herbivory. Cyanobacterial biomass was 1.5 times greater when nudibranchs were present relative to when nudibranchs were absent. Although sea hare grazing can substantially reduce cyanobacterial biomass, predation of sea hares may mitigate grazing pressure, and therefore increase the abundance of cyanobacteria.


Cyanobacteria Gymnodoris ceylonica Lyngbya majuscula Stylocheilus striatus Trophic cascade 



Comments by Craig Osenberg and Brian Silliman greatly improved this manuscript. Staff of the Richard B. Gump South Pacific Research Station provided invaluable logistical support. This project was possible with financial support from NSF (OCE-0242312), a Sigma-Xi grant to SWG, and a Three Seas Fellowship and FACE grant to ACS.


  1. Ahern KS, Ahern CR, Udy JW (2008) In situ field experiment shows Lyngbya majuscula (cyanobacterium) growth stimulated by added iron, phosphorus and nitrogen. Harmful Algae 7:389–404CrossRefGoogle Scholar
  2. Bolker BM (2008) Ecological models and data in R. Princeton University Press, New JerseyGoogle Scholar
  3. Capper A, Paul VJ (2008) Grazer interactions with four species of Lyngbya in southeast Florida. Harmful Algae 7:717–728CrossRefGoogle Scholar
  4. Capper A, Tibbetts IR, O’Neil JM, Shaw GR (2006) Dietary selectivity for the toxic cyanobacterium Lyngbya majuscula and resultant growth rates in two species of opisthobranch mollusc. J Exp Mar Biol Ecol 331:133–144CrossRefGoogle Scholar
  5. Corless RM, Gonnet GH, Hare DEG, Jeffrey DJ, Knuth DE (1996) On the Lambert W function. Advances in Computational Mathematics 5:329–359CrossRefGoogle Scholar
  6. Cruz-Rivera E, Paul VJ (2002) Coral reef benthic cyanobacteria as food and refuge: Diversity, chemistry and complex interactions. Proc 9th Int Coral Reef Symp 1:515–520Google Scholar
  7. Elmetri I, Bell PRF (2004) Effects of phosphorus on the growth and nitrogen fixation rates of Lyngbya majuscula: implications for management in Moreton Bay, Queensland. Mar Ecol Prog Ser 281:27–35CrossRefGoogle Scholar
  8. Gosliner TM, Behrens DW, Williams GC (1996) Coral reef animals of the Indo-Pacific. Sea Challengers, MontereyGoogle Scholar
  9. Holling CS (1961) Principles of insect predation. Annu Rev Entomol 6:163–182CrossRefGoogle Scholar
  10. Juliano SA (ed) (2001) Non-linear curve fitting: predation and functional response curves. Oxford University Press, New YorkGoogle Scholar
  11. Kuffner IB, Paul VJ (2004) Effects of the benthic cyanobacterium Lyngbya majuscula on larval recruitment of the reef corals Acropora surculosa and Pocillopora damicornis. Coral Reefs 23:455–458CrossRefGoogle Scholar
  12. McCoy MW, Bolker BM (2008) Trait-mediated interactions: influence of prey size, density and experience. J Anim Ecol 77:478–486CrossRefPubMedGoogle Scholar
  13. Nagle DG, Paul VJ (1998) Chemical defense of a marine cyanobacterial bloom. J Exp Mar Biol Ecol 225:29–38CrossRefGoogle Scholar
  14. Nagle DG, Paul VJ (1999) Production of secondary metabolites by filamentous tropical marine cyanobacteria: Ecological functions of the compounds. J Phycol 35:1412–1421CrossRefGoogle Scholar
  15. Osborne NJ, Webb PM, Shaw GR (2001) The toxins of Lyngbya majuscula and their human and ecological health effects. Environ Int 27:381–392CrossRefPubMedGoogle Scholar
  16. Paul VJ (2008) Global warming and cyanobacterial harmful algal blooms. Adv Exp Med Biol 619:239–257CrossRefPubMedGoogle Scholar
  17. Paul VJ, Pennings SC (1991) Diet-derived chemical defenses in the sea hare Stylocheilus longicauda (Quoy et Gaimard 1824). J Exp Mar Biol Ecol 151:227–243CrossRefGoogle Scholar
  18. Paul VJ, Thacker RW, Banks K, Golubic S (2005) Benthic cyanobacterial bloom impacts the reefs of South Florida (Broward County, USA). Coral Reefs 24:693–697CrossRefGoogle Scholar
  19. Pennings SC, Paul VJ (1993a) Secondary chemistry does not limit dietary range of the specialist sea hare Stylocheilus longicaud. J Exp Mar Biol Ecol 174:97–113CrossRefGoogle Scholar
  20. Pennings SC, Paul VJ (1993b) Sequestration of dietary secondary metabolites by three species of sea hares: location, specificity and dynamics. Mar Biol 117:535–546CrossRefGoogle Scholar
  21. Pennings SC, Nastisch S, Paul VJ (2001) Vulnerability of sea hares to fish predators: importance of diet and fish species. Coral Reefs 20:320–324CrossRefGoogle Scholar
  22. R Development Core Team (2008) R: A language and environment for statistical computing. R Foundation for Statistical Computing, ViennaGoogle Scholar
  23. Rogers D (1972) Random search and insect population models. J Anim Ecol 41:369–383CrossRefGoogle Scholar
  24. Rosenzweig ML (1971) Paradox of enrichment: Destabilization of exploitation ecosystems in ecological time. Science 171:385–387CrossRefPubMedGoogle Scholar
  25. Stielow S, Ballantine DL (2003) Benthic cyanobacterial, Microcoleus lyngbyaeus, blooms in shallow, inshore Puerto Rican seagrass habitats, Caribbean Sea. Harmful Algae 2:127–130Google Scholar
  26. Switzer-Dunlap M, Hadfield MG (1977) Observations on development, larval growth and metamorphosis of four species of aplysiidae (Gastropoda: Opisthobranchia) in laboratory culture. J Exp Mar Biol Ecol 29:245–261CrossRefGoogle Scholar
  27. Thacker RW, Nagle DG, Paul VJ (1997) Effects of repeated exposures to marine cyanobacterial secondary metabolites on feeding by juvenile rabbitfish and parrotfish. Mar Ecol Prog Ser 147:21–29CrossRefGoogle Scholar
  28. Watkinson AJ, O’Neil JM, Dennison WC (2005) Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia. Harmful Algae 4:697–715CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.School of Biological SciencesVictoria University of WellingtonWellingtonNew Zealand
  2. 2.Department of BiologyUniversity of FloridaGainesvilleUSA

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