In the 1940's Argentina wanted to start fur trading. In order to do this they released 50 North American Beavers into the wild. The results have been disastrous. Here is a link to an article covering this.
http://www.nature.com/news/2008/080618/full/453968a.html
A list of introduced species is located here.
http://en.wikipedia.org/wiki/List_of_introduced_species
Keep in mind that an ecosystem is a lot like a row of dominoes. If one thing changes, then all things will change. Just like the dominoes, when one falls the rest follow.
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