During low tide bears leave the salt marshes for the adjacent mud flats to dig razor clams and other bivalves. Tidal streams bisecting the salt marshes provide nursery habitat for a variety of juvenile fish. In late summer, salmon enter the salt marsh streams on their way to their spawning grounds. As salmon arrive, bears transition from sedges to salmon in preparation for the upcoming winter months. Waterfowl, shorebirds, song birds, moose, river otters, and other small mammals can also be found using these marshes.
Coastal salt marshes comprise less than 1% of Lake Clark National Park and Preserve yet are critical to the survival of the park's coastal brown bears. The importance of the salt marshes to the ecology of the park has prompted National Park Service scientists to monitor the condition of these vital systems.