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Field expenments support previous laboratory assays Indicating that crude lipid-soluble extracts of the Canbbean encrusting gorgonian octocoral Erythropod~um canbaeorum (Duchassalng & Mlchelotti) detel predation by reef fishes An extract of E canbaeorum incorporated into carrageenan food strips at the same volumetric concentration as i t occurred in gorgonian tlssues deterred feeding of a natural assemblage of fishes on the same reef from which the gorgonian had been collected Fleld assays using carrageenan stnps conta~ning naturally occurnng concentratlons of several pulitled secondary metabolites isolated from the crude extract revealed that the f e e d ~ n g deterrent effects were present In a fraction containing chlonnated dlterpenoid (Cz0) compounds (erythrolldes), but not in a fraction conta~ning sesquiterpene (Cl5) hydrocarbons (of which erythrodiene, a previously unreported manne natural product was a major component) Three compounds were purlfled from the erythrolide fraction erythrolide A, erythrolide B and erythrolide D Only the last 2 of these compounds, when assayed independently, Inhibited feeding of reef flshes at the natural concentratlons found in E canbaeorun~ Whlle the erythrolides appear to defend E canbaeorum from reef predators, the funct~on of sesqulterpene hydrocarbons, which occur in high concentratlons in the llpid-soluble extracts of many octocorals, remains unclear

Defensive properties of secondary metabolites from the Caribbean gorgonian coral Erythropodium caribaeorum