Aquatic ecosystem
（重定向自Pondlife）
![An estuary mouth and coastal waters, part of an aquatic ecosystem](/Images/godic/202502/03/Estuary-mouth4428.jpg")
![A classification of marine habitats.](/Images/godic/202502/03/Oceanic_divisions.svg4428.png")
![Freshwater ecosystem.](/Images/godic/202502/03/Panorama_presa_las_niñas_mogan_gran_canaria4428.jpg")
![The three primary zones of a lake.](/Images/godic/202502/03/Primary_zones_of_a_lake4428.png")
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.