NOAA
Noaa: Lionfish Discovery Story
The National Ocean Service Education Association has put together this well supported set of articles outlining the cause and resulting effects of invasive species, primarily the Lionfish. This link begins with looking at the story of...
American Institute of Biological Sciences
Action Bioscience: Biodiversity
This site from the American Institute of Biological Sciences contains articles on a wide array of issues related to species diversity and extinction. Many articles available in Spanish.
Other
Florida Fish and Wildlife Conservation Commission: How Do They Get Here?
An article that explains the pathways by which non-native fish and wildlife find their way into Florida's ecosystem.
Untamed Science
Untamed Science: Competition
This well-written article explains what competition in an ecosystem is and the different ways it can manifest itself. It also looks at how organisms avoid competition, some disadvantages and outcomes of competition, the impact of a...