Why are top predators particularly subject to overfishing? What are some major implications for the rest of the food web? In addition, provide an example of a top predator and how it has been impacted by overfishing.
In what sense are invasive species "exotic?" In addition, provide a few sentences about snakehead fish, and lionfish as exotics -- which aquatic environments do they present dangers around the United States? How about the Great Lakes-- zebra mussels?