The Beach: Sandy Shores and Surf Zones

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The Sandy Beach

The sandy beach and surf zones are two environments, which are usually

found along the edges of the sea. The sandy shore environment is made

up of sand and grains of rock and crushed shells while the surf zone

environment is made up mainly of water. Although the sandy beach zone

is said to be one of the most common environments along the shore, it

is considered a very harsh and dynamic environment.

Sandy beach shores usually have very harsh physical conditions. The

constant sand movement presents a problem for living organisms. These

organisms have nothing to hold on to, and have to either swim or

burrow rapidly or else they will be swept away by the water and the

sand. They also cannot live on the surface or live in permanent

burrow. This is why sandy beaches are hardly populated when compared

to other shores. In the sandy beach zone there are approximately 6 to

7 different species. However, although there is little diversity each

of these species may be millions in numbers.

The Upper inter-tidal zone consists mainly of dunes trees and

crustaceans. This zone has the widest range of heat and cold. Because

of this it also presents problems of heat in the summer and problems

with freezing for organisms in the winter.

The Mid-zone has similar problems with temperature as the upper

inter-tidal zone. This zone has more waves and therefore has rapid

sand removal during storms. Organisms such as the Pismo clam and spiny

mole crab live in this zone. The swash zone is where wave breaking

occurs. This zone has the highest water movement but does not have the

extreme temperatures, which the other zones have. The organisms that

live in the swash zone include the sand crab among others. Despite the

harsh conditions, which characterize this environment, sandy beach

shores, gives different number of habitats for organisms. Each habitat

or zone contains a particular group of organisms living in the zone.

For example the upper part of the beach contains a zone of plants such

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