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Stones,
blocks and cliffs can be composed of different material. Hard material like
granite is a secure base for organisms to attach to, compared to more porous
and easily eroded material like sand and limestone, but because of their
porosity, they do not dry out as quick. They can also build many micro environments,
for example in crevices, cavities and caves, which is important for a great
many organisms. Notice how many cliff
living organisms find hard man made objects congenial.
Zoning and flecked occurrence
On cliffs by the sea, certain organisms are
more common than others, especially vertically. Here it is possible to see
distinctive belts or zones that are dominated by a certain very noticable
specie, but often the organisms are so mixed that no distinctive pattern
is seen. How these variations arise and change during different periods,
for example seasonal, has not
been studied enough to enable an exact description.
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