An aquatic ecosystem include wetlands, rivers, lakes, oceans and coastal estuar- ies. These essential elements of the eaith's dynamic natural resources. The aquatic ecosystem work in unison to provide necessary components to humans, animals, economies, and land. Aquatic ecosystems provide freshwater which is necessary to life of all living organisms. It is also a major component is the world's food supply. They are also a means for recreation such as shing, swimming, and boating. They affect many aspects of other ecosystems including human life. Aquatic ecosystems are critical to our global environment