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Certain species form communities called microatolls, which are colonies whose top is dead and mostly above the water line, but whose perimeter is mostly submerged and alive. Average tide level limits their height.

These are commonly known as zooxanthellae. Such corals require sunlight and grow in clear, shallow water, typically at depths less than 60 metres (200 ft). Corals are major contributors to the physical structure of the coral reefs that develop in tropical and subtropical waters, such as the Great Barrier Reef off the coast of Queensland, Australia.

In the Caribbean and tropical Pacific, direct contact between ~quarenta–70% of common seaweeds and coral causes bleaching and death to the coral via transfer of lipid-soluble metabolites.[54] Seaweed and algae proliferate given adequate nutrients and limited grazing by herbivores such as parrotfish.

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Planula larvae exhibit positive phototaxis, swimming towards light aqui to reach surface waters, where they drift and grow before descending to seek a hard surface to which they can attach and begin a new colony. They also exhibit positive sonotaxis, moving towards sounds that emanate from veja mais the reef and away from open water.

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Over many generations, the colony thus creates a large skeleton characteristic of the species. Individual heads grow by asexual reproduction of polyps. Corals also breed sexually by spawning: polyps of the same species release gametes simultaneously over a period of one to several nights around a full moon.

A coral "group" is a colony of myriad genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and saiba mais a few centimeters in length. A set of tentacles surround a central mouth opening. An exoskeleton is excreted near the base.

The most popular kind of coral kept is soft coral, especially zoanthids and mushroom corals, which are especially easy to grow and propagate in a wide variety of conditions, because they originate in enclosed parts of reefs where water conditions vary and lighting may be less veja mais reliable and direct.

Brooding species are most often ahermatypic (not reef-building) in areas of high current or wave action. Brooders release only sperm, which is negatively buoyant, veja mais sinking on to the waiting egg carriers who harbor unfertilized eggs for weeks.

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