Jonathan Armien and Matthew Andrighetti
populations of wading birds declined by 85 to 95%; sixty-eight plant and animal species were threatened or endangered; over 1.5 million acres were infested with invasive, exotic plants; and one million acres were contaminated with mercury. for more on this topic visit: http://www.pbchistoryonline.org/page/swamps-or-marshes-human-interaction
People hunt Alligators for food. The Alligator population is dropping down because of it.
Python constricting Deer
Every year people keep Pythons as pets and let them go in swamps when the get big.