An aquatic ecosystem is an ecosystem in a body of water. Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. The two main types of aquatic ecosystems are marine ecosystems and freshwater ecosystems.An aquatic ecosystem is an ecosystem in a body of water. Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. The two main types of aquatic ecosystems are marine ecosystems and freshwater ecosystems Ecosystems. The marine biome is divided into three distinct ecosystems: oceans, coral reefs and estuaries. The oceans, which include the Pacific, Atlantic, Indian, Southern and Arctic Oceans, are interconnected and cover about 71 percent of the Earth's surface Aquatic ecosystems are located within a watery environment (aquatic environment) and cover more than 70% of Earth's surface. Examples of aquatic ecosystems include lakes, ponds, bogs, rivers, estuaries and the open ocean. Aquatic ecosystems include oceans, lakes, rivers, streams, estuaries, and wetlands. Within these aquatic ecosystems are living things that depend on the water for survival, such as fish, plants, and microorganismsOrganisms which survive in water are called aquatic organisms. ... Examples of aquatic ecosystem include oceans, lakes and rivers. An aquatic ecosystem includes freshwater habitats like lakes, ponds, rivers, oceans and streams, wetlands, swamp, etc Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. The two main types of aquatic ecosystems are marine ecosystems and freshwater ecosystems