Coral reefs

Coral reefs

Coral reefs are structures formed from the calcium carbonate secretions of corals. They are colonies of tiny animals in marine areas containing few nutrients.

Industry: Natural environment

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Coral reefs

Paliform crown

Natural environment; Coral reefs

A circle of paliform lobes that surround the columella.

Limits of acceptable change (LAC)

Natural environment; Coral reefs

A framework for establishing acceptable and appropriate resource and social conditions in recreation settings. LAC is an approach to balance recreational use of a "wilderness" area with environmental ...

Chemoreceptor

Natural environment; Coral reefs

A receptor that is stimulated by the presence of certain chemical substances.

Biocycle

Natural environment; Coral reefs

A subdivision of the biosphere, e.g., a biochore.

Frontal threat display

Natural environment; Coral reefs

Agonistic display behaviour in which a fish faces another fish and flares its gill covers (opercula) and opens its mouth wide. This behaviour may indicate aggression, territoriality or self defence ...

Syphon

Natural environment; Coral reefs

An opening in molluscs or in urochordates (tunicates) which draws water into the body cavity. In many molluscs, such as octopods and squids, the syphon may be used to forcibly expel water, providing ...