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Reef
From Wikipedia, the free encyclopedia
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For other uses, see
Reef (disambiguation).
Pamalican island with surrounding reef,
Sulu Sea,
Philippines.
A reef surrounding an
islet.
In nautical terminology, a reef is a
rock,
sandbar, or other feature lying beneath the surface of the water (six
fathoms or less beneath low water).
Many reefs result from
abiotic processes?
deposition of
sand,
wave erosion planning down rock outcrops, and other natural processes?but the best-known reefs are the
coral reefs of
tropical waters developed through
biotic processes dominated by
corals and
calcareous algae.
Artificial reefs such as shipwrecks are sometimes created to enhance physical complexity on generally featureless sand bottoms in order to attract a diverse assemblage of organisms, especially
fish.
Contents
Biotic reef
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