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

Nominal exposure

Natural environment; Coral reefs

With refefence to oil spills, oil exposure concentrations based on the proportions of oil added to water (without actually measuring how much oil was ultimately mixed into the water).

Palatine

Natural environment; Coral reefs

A bone in the roof of the mouth of fishes. The palatine is cartilaginous in some primitive bony fishes.

Self-contained underwater breathing apparatus (SCUBA)

Natural environment; Coral reefs

A diving mode independent of surface air supply in which the diver uses open circuit self-contained underwater breathing apparatus which supplies air or breathing gases at ambient pressure.

Transect

Natural environment; Coral reefs

A line used to survey the distribution of organisms or substrate across a given area. Sample plots or points are established along the transect for collecting data.

Hydrophyte

Natural environment; Coral reefs

A plant that grows partly or wholly in water whether rooted in the substrate or floating without anchorage, as the water hyacinth; an aquatic plant.

Directional selection

Natural environment; Coral reefs

A type of natural selection that removes individuals from one end of a phenotypic distribution and thus causes a shift in the distribution. The frequency of an allele is changed in a constant ...

Periderm

Natural environment; Coral reefs

An external layer of secreted cuticular material in many Anthozoa. The term is synonymous with "cuticle." In woody plants, the periderm is a protective secondary tissue produced by the cork cambium .