How River Ecosystems Function

Rivers are dynamic freshwater ecosystems shaped by flowing water. Key components:

1. Water Flow – creates habitats (riffles, pools, runs) and transports nutrients, oxygen, sediments.
2. Nutrient Cycling – nitrogen, phosphorus from runoff and decay fuel primary production.
3. Aquatic Plants – algae, macrophytes, mosses produce oxygen, provide habitat, stabilize banks.
4. Invertebrates – insects, mollusks, crustaceans; indicators of water quality.
5. Fish & Amphibians – diverse species occupying various trophic levels.
6. Food Webs – energy flows from producers to top predators; decomposers recycle nutrients.
7. Human Impact – pollution, water extraction, dams threaten balance; conservation is critical.