Estuaries

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Term Paper Title	Estuaries
# of Words	1190
# of Pages (250 words per page double spaced)	4.76

Estuaries

Estuaries

     An estuary is a coastal area where fresh water from rivers and streams
mixes with salt water from the ocean.  Many bays, sounds, and lagoons along
coasts are estuaries. Portions of rivers and streams connected to estuaries are
also considered part of the estuary.  The land area from which fresh water
drains into the estuary is its watershed. Estuaries come in all shapes and sizes,
each unique to their location and climate.  Bays, sounds, marshes, swamps,
inlets, and sloughs are all examples of estuaries.
     An estuary is a fascinating place from the largest landscape features to
the smallest microscopic organisms.  When viewing an estuary from the air on is
practically amazed by dramatic river bends as freshwater finds its way back to
the sea.  The vast expanse of marsh grasses or mudflats extend into calm waters
that then follow the curve of an expansive barrier beach.  Wherever there are
estuaries, there is a unique beauty.  As rivers meet the sea, both ocean and
land contribute to an ecosystem of specialized plants and animals.
     At high tide, seawater changes estuaries, submerging the plants and
flooding creeks, marshes, panes, mudflats or mangroves, until what once was land
is now water. Throughout the tides, the days and the years, an estuary is
cradled between outreaching headlands and is buttressed on its vulnerable
seaward side by fingers of sand or mud.
     Estuaries transform with the tides, the incoming waters seemingly
bringing back to life organisms that have sought shelter from their temporary
exposure to the non-aquatic world.  As the tides decline, organisms return to
their protective postures, receding into sediments and adjusting to changing
temperatures.
     The community of life found on the land and in the water includes
mammals, birds, fish, reptiles, shellfish, and plants all interacting within
complex food webs.  Flocks of shore birds stilt through the shallows, lunging
long bills at their abundant prey of fish, worms, crabs or clams.  Within the
sediments, whether mud, sand or rocks, live billions of microscopic bacteria, a
lower level of the food web based largely on decaying plants.
     Estuaries are tidally-influenced ecological systems where rivers meet
the sea and fresh water mixes with salt water.  Estuaries provide habitat;tens
of thousands of birds, mammals, fish, and other wildlife depend on estuaries.
They provide marine organisms, most commercially valuable fish species included,
depend on estuaries at some ...

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