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Possible ways in which a coral associate could be affected by its host are given in Table I and four areas of interaction are discussed further in the following sections. The type of environment that a symbiont faces will be greatly influenced by its own size, by the feeding methods of the host, and by whether the coral polyps are small and numerous or large and fleshy. TABLE I P O T E N T I A L INTERACTIONS B E T W E E N C O R A L S AND T H E I R Coral feature Nematocysts and feeding mechanisms Coral tissue Coral mucus Plankton caught by coral Sediment settling on coral Zooxanthellae and cells expelled by coral Dissolved material released by coral Coral skeleton Possible positive effects on coral associate Protect established symbionts from predators, parasites, and fouling organisms Food; source of materials t h a t might deter predators Food source Food source Food source Food source INHABITANTS Possible negative effects on coral associate Could kill symbionts or their larval stages attempting to settle Enzymes from mesenterial filaments could destroy symbiont stages Could entangle and remove larval stages Food source ?

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