Marshes that extend for miles are found further south in the Barataria-Terrebonne Estuary.
Marsh plant roots bind the soil, creating the fabric that holds the wetlands in place. Marshes also offer food and shelter to animals. Decomposed marsh plants are the foundation of this part of the estuary’s food chain. The food chain begins with the microorganisms that flourish on the decomposing plants. These microorganisms are a primary food source for many bottom- dwelling invertebrates that in turn provide food for small fish, shellfish, birds, and mammals. Marsh habitats can be divided into four zones that extend roughly parallel to the coastline: fresh marsh, intermediate marsh, brackish marsh, and salt marsh.