The role of diatom-based film as an inducer of metamorphosis in larvae of two species of sea urchin, Pseudocentrotus depressus and Anthocidaris crassispina
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概要
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Diatom-based film grown on plastic plates, consisting of several species of periphytic diatom and multispecies of bacteria, is used to induce larval metamorphosis during mass production of sea urchin juveniles. This study attempted to elucidate the roles of diatoms and bacteria in larval metamorphosis of the sea urchins Pseudocentrotus depressus and Anthocidaris crassispina, and to clarify the characteristics of the metamorphosis-inducing cue(s) in the film. Laboratory-grown diatom-based films induced larval metamorphosis in both species of sea urchin, but the response rate was higher in P. depressus. Diatoms collected on glass-fiber filters induced metamorphosis in larvae of both species, although the inducing activity was significantly less than that of the diatom-based films. By contrast, no larva metamorphosed on bacterial films that formed from the filtrates. These results suggest that bacteria alone cannot induce metamorphosis and that diatoms play a major role in the induction. Antibiotic treatment reduced the inducing activity in diatom-based films, even though the treatment did not control bacterial growth. None of five isolated species of periphytic diatom induced larval metamorphosis by itself. Glutaraldehyde (5%), HCl (1N), and heat treatment (45°C) destroyed the inducing activity of the films, but lectin treatments (LCA, SBA, and WGA) had no effect. This suggests that the metamorphosis-inducing cue(s) in diatom-based films is (are) unstable and that carbohydrates do not play a main role in inducing metamorphosis.
- 日本付着生物学会の論文
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