Wetlands can be classified as marshland and swamps, found along lakes and rivers, in local depressions and prairie sinkholes. Wetlands play a major part in the Earth's ecosystem by controlling erosion, absorbing floodwater, purifying surface water and helping recharge aquifers. Wetlands create a great diversity of animal and plant life. The more diverse the plant life, the more species of animals will be attracted. Wetlands are vital in the balance of the Earth's ecosystems and create sanctuaries for wildlife, fish, and migratory birds.
Wetlands are examples of all levels of the food chain.
Level 1 includes plants being the primary producer creating food for the other levels to be sustained. Also included in level 1 would be bacteria, fungi and decomposers. Level 2 includes the primary consumers. These would be the herbivores alias plant eaters or salad munchers. Level 3 includes the secondary consumers.