• Autumn photo of Lake Clark and the Aleutian Range in Lake Clark National Park & Preserve

    Lake Clark

    National Park & Preserve Alaska

Coastal Salt Marshes

Silver Salmon Creek salt marsh.
Extensive and isolated salt marshes such as this one at Silver Salmon Creek occur along the Park's Cook Inlet coast.
K Jalone, NPS Photo
 
Bear cub in Salt Marsh.

An early protein source for young bear cubs along the coast are the young salt marsh sedges.

C. Carson/NPS Photo

Salt marshes are among the most productive ecosystems in the world and a prominent feature of Lake Clark National Park's coastline. Each spring brown and black bears congregate in these meadows to graze on the fresh green sedges after winter hibernation. With their fat reserves depleted and with young cubs to feed, bears emerge from their dens in need of high protein nutrition. Young sedges in the salt marshes are a critical early season nutrition source for bears. 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.

Did You Know?

Lake Clark is fed by snowfall and glaciers in the surrounding mountains.

Lake Clark is 1056 feet deep and covers 128 square miles. Thousands of years ago, the lake (and nearby Lake Iliamna) may have been open to salt water before being closed off by glacial outwash deposits.