are the most common type of seaweed found on rocky beaches. They
normally have a method to strongly attach themselves to rock surfaces.The brown colour of the seaweed is due to the
fucoxanthin overriding the green pigment chlorophyll. Both pigments
are used in the photosynthesis of light, fucoxanthin improving the
process when the algae is covered by water.
species has its own niche on the shore, the major factors being the amount
of time they are left uncovered by the tide and the degree of shelter
the beach offers. These niches are often strongly defined allowing
the species of brown seaweed found on a beach to be used to zone
it, or classify it shelter or exposure level, particularly relevant
in the case of the wracks.
richest area of brown seaweed with its accompanying abundant animal
life is the kelp forest. This forest is rarely seen, its fringe
only being uncovered with spring tides. The forest is dominated
by large brown seaweeds such as kelp. These large seaweeds have
strong holdfasts to grip the rock face, but with strong storms even
these are ripped from the forest, the seaweeds becoming stranded
en masse on the shore. After a storm not only will the seaweed thrown
up on the beach, but even the anchorage rock the plant was attached
to. This is the only easy opportunity to study these seaweeds.