Producer - Composer - decomposer
Primary Producers: Primary producers in a coral reef ecosystem include plankton, sea weeds and sea grasses. All of these organisms are photosynthetic organisms that get their energy from the sun.
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Primary Consumers: The second trophic level in coral reef ecosystems are primary consumers such as zooplankton, coral polyps, sponges, mollusks, sea urchins, starfish and smaller fish.
Secondary Consumers: The third trophic level in a coral reef ecosystem are the secondary consumers that eat primary consumers. These organisms typically include larger reef fishes,Trigger fish,Parrot fish,Surgeon fish, lobsters and sea turtles.
Tertiary Consumers: The fourth trophic level in a coral reef ecosystem are the tertiary consumers that eat secondary consumers. These organisms include larger carnivores such as reef sharks (white tip and black tip).
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Decomposers: Fan worms, sea cucumbers, snails, crabs, bristle worms and bacteria are decomposers in the Great Barrier Reef.