Most visitors to a Louisiana salt marsh are drawn to the plants, birds, and small animals such as snails, mussels, and fish visible on the marsh surface. Below the sediment surface is a community of animals, mostly worms and small crustaceans that make up the benthic infauna (size < 0.5 mm). These organisms are a vital part of the marsh ecosystem with their burrowing activities (supporting healthy marsh soils) and provisioning of food for larger predators. Benthic infauna, because they are confined to a limited area, are considered indicators of marsh health and function. Our work is focused on the infauna within the sediments along pre-determined transects into the marsh at 10- and 50-m distance. Sampling is by core tubes, sieved organisms from the sediments, and microscopic determination of abundance and diversity.