Introduction: from snow and ice melting.not forgetting the lakes


the two thirds of our planet surface is enveloped with water. The earth’s five oceans
and its seas, rivers that comes from rainfall, from snow and ice melting.not forgetting the lakes and ground water even swamps.
They are all connected to present the aquatic area which is a home of huge
number of living things.

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The water is very effective and important
molecule for all organism and it is essential part in life. Most of the
organisms cannot survive without the presence of water. Although, they don’t live inside it such as human and
plants and different organisms, they have provided with food from inside it,
also passengers and goods are often carried by sea.

biodiversity of hydrous ecosystems is one of 
largest fortunes. When biodiversity word comes on people’s minds, the
first thing they ever think about is the rainforests. The rainforests contain a
huge amount of biodiversity, and alot of sorts that we never thought about
them. In fact in aquatic oceans there is a similar biodiversity found in there.
For instance, coral reefs have been considered as the rainforests of the sea
because they are a home where alot of marine organisms lives in. But coral
reefs, like aquatic ecosystems, are easily affected by outside factors.

factors are ingredients of a natural environment that are not alive. In other
words, physical or chemical parts of the environment that affect the organisms
that are in that environment. For aquatic ecosystems, these factors include
light levels, water flow rate, temperature, dissolved oxygen, acidity (pH),
salinity and depth.An aquatic ecosystem is a community of living organisms
socializing with each other and their surroundings under the water. There are two main kinds of aquatic
ecosystems called saltwater ecosystem and freshwater ecosystems.

Wet lands are areas that are permantly or regularly under
fresh or salty water, such as bonds, rivers, bogs, marshes, estuaries and
mangrove swamps.

While the open
ocean starts at the edge of continental shelf where the seabed plunges suddenly
down the continental slope to greater depths. Its divided into three zones: the
benthic zone is at the bottom, above that the demersal zone, and the pelagic
zone is uppermost.

Ocean currents
are driven by a combination of winds and the earth’s rotation, and they are
regulating permanent or continuous movement of ocean’s
water. The motion of the ocean water is
promoted by forces acting on the water counting the breaking waves, salinity
differences, Coriolis effects, the wind and temperatures

While ocean
surface currents are like large rivers many kilometers wide, on average 100m
deep and flowing at 15 km per hour. also it affect only the top 100m so the
ocean deep current involve the whole ocean

 However, the major currents are spilt on
either side of equator into huge rings called gyres.

This essay is
concentrating on comparing between fresh and salt water and the features that include
each ecosystem. we will discuss a few elements that impact aquatic ecosystems.
concentrated on the abiotic factors and how they affect aquatic life. These are
the factors that cause a deep ocean to be totally different from a shallow


Plus, it will
include the types of Ocean currents and their effects in order to work to
neutralize the temperature difference between different areas in the oceans
such the winds do on land. As a body of water warms and cools slowly it’s an
excellent, and fairly stable, transmitter of heat and cold which feeds into the
weather system.