Various experiments were performed to investigate the inductive effect of some biotic agents - adult conspecifics, macroalgae of the genera Laminaria and Enteromorpha and detrital particles - on the onset of metamorphosis in competent larvae of the echinoid Paracentrotus lividus. Adult conspecifics and laminarians did not induce larvae to metamorphose. Detrital particles always had a high inductive power, provided that contact occurred between larvae and particles. The inductive effect of enteromorph algae was seasonal, and metamorphosis was induced either through direct contact with the alga or with a surface previously conditioned by the alga, as well by placing larvae in water previously conditioned by the alga.
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