1. Lotic
1.1. Rivers
1.1.1. fast current
1.1.2. 8-14 mg/L oxygen concentration
1.2. Streams
1.2.1. slow current
1.2.2. 8-14 mg/L oxygen concentration
1.3. Oceans
1.3.1. constant current
1.3.2. 9 mg/L oxygen concentration
2. Lentic
2.1. Lakes
2.1.1. no current
2.1.2. 9-10 mg/L oxygen concentration
2.1.3. Littoral zone
2.1.3.1. emerged plants
2.1.3.2. floating plants
2.1.3.3. submerged plants
2.1.4. Limnetic zone
2.1.4.1. euphotic zone
2.1.4.1.1. dark
2.1.4.1.2. decomposers
2.1.5. Euphotic zone
2.2. Wetland
2.2.1. no current
2.2.2. 7-14 mg/L oxygen concentration
2.2.3. wet meadow
2.2.3.1. plants
2.2.4. emergent
2.2.4.1. plants that emerge from water's surface
2.2.5. aquatic
2.2.5.1. submerged plants
2.3. Ponds
2.3.1. no current
2.3.2. 6-11 concentration
2.3.3. Littoral zone
2.3.3.1. emerged plants
2.3.3.2. floating plants
2.3.3.3. submerged plants
2.3.4. Limnetic zone
2.3.4.1. euphotic zone
2.3.4.1.1. dark
2.3.4.1.2. decomposers
2.3.5. Euphotic zone