The Effects Of Foreign Species Introduction On An Ecosystem

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Term Paper Title	The Effects Of Foreign Species Introduction On An Ecosystem
# of Words	619
# of Pages (250 words per page double spaced)	2.48

The Effects of Foreign Species Introduction On An Ecosystem

The Effects of Foreign Species Introduction On An Ecosystem

     The effects of foreign species introduction into an ecosystem are very
profound.  From small microorganisms to species of large mammals, many foreign
species introductions occur every day.  New implications of their introduction
are found just as often.
     When a foreign species is introduced into an ecosystem, often the
ecosystem contains no natural predators for the new species.  This lack of
predators sometimes leads to; in conjunction with a supply of food suitable for
the new species, a period of exponential growth of the species.  This growth and
severe increase in the size of the population can cause a shortage of food for
native species.  When this occurs, the native species disappear and the
biodiversity in the ecosystem is reduced.  The carrying capacity is also reduced
because the ecosystem will not be capable of supporting the same amount of life.
If one species hogs the food and does not contribute itself to the food chain,
the balance is disrupted and there will be less available for the native species.
Once the new species has found its ecological niche however, balance begins to
restore itself.
     When the biodiversity in the ecosystem is reduced, the ability of the
ecosystem to grow, or the biotic potential, is as well reduced.  More species
residing in an ecosystem which depend on each other allows for a greater chance
of survival and perpetuation.  This may occur for several reasons, for example a
bee and a flower.  The bee requires the pollen of the flower to make its honey.
However, while gathering the pollen from the flowers, it transfers some of the
pollen to female flowers, allowing them to make seeds and spawn further
generations.  However, a foreign species may, for example, eat the bees
therefore allowing for decreased fecundity of the flowers.
     Another implication of the introduction of foreign species into an
ecosystem is the potential fo...

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