"The national park system was created to conserve unimpaired many of the world's most magnificent landscapes, places that enshrine our nation's enduring principles, and places that remind us of the tremendous sacrifices Americans have made on behalf of those principles" (NPS 2006). To accomplish this, an important component of the current management strategies calls for the National Park Service (NPS) to maintain as parts of the natural ecosystems of parks all plants and animals native to park ecosystems and to restore, where appropriate, native plant and animal species (NPS 2006), While management actions today make every attempt to meet this mandate, during the formative years of the NPS, managers promoted parks by managing scenery and enhancing tourism activities such as recreational fishing, sometimes to the detriment of natural systems.