rat, alimentation, etc.) et écologiques (dynamique des populations, relations avec le milieu biotique et abiotique, etc.) à l'origine du succès de ce groupe animal.Echinoderms often dominate the ecosystem in which they live whatever they are predator, browser, or detritivorous. The research aims to determine the biological (larval biology, reproduction, settlement, feeding, etc.) and ecological (population dynamics, relationships with the biotic and abiotic environments, etc.) mecanisms explaining the succes of this animal group.