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Some areas get only partial sun, and many of the areas are under or around pine and fir trees. An invasion of American beach grass is under way along the Oregon coast, threatening to change dune ecology and reduce the ability of dunes to protect roads, property and towns from coastal storms.Scientists at Oregon State University have documented a slow but steady takeover by this beach grass, an invasive species. Farther inland, the oblique dunes stand 200 feet or more above sea level, their ridgelines formed by the interaction of prevailing summer winds from the north-northwest and winter winds from the south-southwest. A number of small inter-dune lakes, such as Lily Lake to the north and Saunders, Beal, and Horsfall Lakes to the south, are largely fed by seasonal precipitation.Tree islands, another prominent topographic feature of the Oregon Dunes, are erosional remnants of a formerly more extensive forested dune surface. The second species of beach grass is called European beach grass (Ammophila arenaria). .Oregon State University. Oregon State University. The third, which is limited to one area, is a subspecies of American beach grass. Introduced near the mouth of the Columbia River in the mid-1930s, also to stabilize beaches, American beach grass tends to out-compete its European cousin. It is Champlain beach grass, or Ammophila breviligulata ssp. There are two primary species of beach grasses in the Unites States, and one uncommon species that is actually a subspecies. The European beach grass did so well that by the 1930s it had spread along the entire Oregon coast, and created an extensive “foredune” system, large protective sand hills found in front of almost every sandy beach in Oregon. Conservation Status: Although still common in many areas, this species has been widely supplanted by European Beach Grass ( Ammophila arenaria ) which grows faster and can better tolerate a variety of environmental factors. Invasion of the European beach grass, the disturbance by off-road vehicles, and encroaching beachfront developments have all contributed to the steep decline in the numbers of Pink Sand Verbena plant clusters. This entry was last updated on March 17, 2018 Film. ScienceDaily shares links with scholarly publications in the Content on this website is for information only. But even beyond that, from Pacific City south, most of the beach grass is the American beach grass, with just a few pockets of European beach grass.“Lower dune heights, increasing wave heights that have been observed over the last 50 years, and global climate change could create a scenario in which the dunes no longer serve a coastal protection function,” Hacker said.Beyond the protection concerns, there are other ecological issues in play as well.While the foredune system created by European beach grass is good for coastal landowners, it is not so good for endangered beach plant species and the federally-threatened Western snowy plover, scientists say. European Beach Grass on the Oregon coast - YouTube. www.sciencedaily.com/releases/2007/09/070923203558.htm (accessed August 14, 2020).Below are relevant articles that may interest you. Invasion Of New Beach Grass Could Weaken Shoreline Protection. Miles and miles of windblown sand. The …Created by Congress in 1972, the Oregon Dunes National Recreation Area (ODNRA) provides federal management for the largest expanse of sand dunes on the West Coast. The Coos Bay estuary is a semi-enclosed, elongated series of sloughs and tidewater streams that drains approximately 825 square miles of southern Oregon's rugged Coast Range. The status of this beach grass variety went unnoticed for more than 50 years, until Seabloom and a colleague discovered it had crept as far south as Tillamook Head and as far north as the Olympic Peninsula.Surveys of the entire Oregon coast have determined that the current range of domination of American beach grass extends from Long Beach, Wash., to Pacific City, Ore. Only Siltcoos, Tahkenitch, and Tenmile Lakes are drained by creeks that flow into the Pacific Ocean.