Seaweed allelopathy to corals: are active compounds on, or in, seaweeds?

摘要: Numerous seaweeds produce secondary metabolites that are allelopathic to corals. To date, most of the compounds identified in this interaction lipid-soluble instead water-soluble. Thus, understanding whether these stored internally where they would not contact corals, or occur on external surfaces could be transferred is critical seaweed–coral interactions and informing realistic experiments chemically mediated interactions. We conducted field assessing effects extracts from macroalgal alone versus total both internal tissues coral Pocillopora verrucosa. Extracts red algae Amansia rhodantha Asparagopsis taxiformis, green alga Chlorodesmis fastigiata, brown Dictyota bartayresiana suppressed photochemical efficiency; bioactive species, were more potent than surface-only despite concentration being many times greater extracts. This suggests previous assays with may ecologically meaningful, but also future should simpler, less concentrated, relevant surface Allelopathic As. taxiformis C. fastigiata significantly effect D. bartayresiana, Am. intermediate between groups. Neither nor seaweed Turbinaria ornata allelopathic, its lack potency differed all other species. Our results suggest lipid-soluble, usually deployed can effective surface-mediated against