Threatening processes
Reasons for the decline of threatened species.
Aquatic weeds
Many of Queensland's freshwater lakes, billabongs, creeks and rivers are threatened by the introduction of exotic aquatic plants. These weeds can smother native plants and reduce the quality of habitat for native animals.
Freshwater ferals
Some exotic fish such as mosquito fish, tilapia, carp and other aquarium species have established in Queensland waterways. They can threaten native fish and frogs through predation, competition, and by spreading disease and parasites.
Shark and ray release
Queensland has some of the best fishing in the world. Fishers can enjoy perfect weather and a huge variety of fish in the rich tropical and sub-tropical waters. But despite this abundance of marine life human activities such as development, destruction of habitats, and fishing are causing some sharks, rays, and sawfish to become threatened.
Stainless steel hooks
Stainless steel fish hooks that become embedded in animals can last for years, causing continuing distress and infections, and sometimes death. Hooks swallowed by smaller fish cause more problems down the food chain when those fish are eaten by pelicans, other seabirds and sharks.
Boat strike
Each year many marine turtles, dugongs and whales are injured or killed by inappropriate operation of boats and personal watercraft. These species are vulnerable in shallow coastal areas and everyone that enjoys the use of these areas should 'go slow for those below'.
Bird disturbance on beaches
Beaches and sandflats are great places for recreation. But they are also the only nesting, roosting and feeding places for some bird species that cannot 'go somewhere else' if all our shorelines are disturbed by people. By not driving or walking on some beaches and sandflats, and by keeping dogs on a lead, we can make a big difference to the survival of terns, curlews and oystercatchers.
Last reviewed 19 July 2011
Last updated 31 August 2007