DESCRIPTION
Ecoregions
Columbia Plateau
The Columbia Plateau ecoregion was shaped by cataclysmic floods and large deposits of wind-borne silt and sand earlier in its geological history. It is dominated by a rolling landscape of arid lowlands dissected by several important rivers, and extends from the eastern slopes of the Cascades Mountains, south and east from the Columbia River to the Blue Mountains.
Nearshore
The Nearshore ecoregion includes a variety of habitats ranging from submerged high-relief rocky reefs to broad expanses of intertidal mudflats in estuaries and hosts a vast array of fish, invertebrates, marine mammals, birds, plants, and micro-organisms. This ecoregion encompasses the area from the outer boundary of Oregon's Territorial Sea to the supra-tidal zone, and up into the estuaries.
Key Habitats
Coastal Dunes
Occurring along the Oregon coastline, coastal dunes provide habitat for species that prefer open, sandy habitats with a high degree of disturbance from winds and tides.
Estuaries
Estuaries are broadly defined as partially enclosed coastal bodies of tidally influenced water with one or more inputs of freshwater, and with a free or intermittent connection to the open sea. Estuaries typically occur at locations where freshwater from rivers, streams, or creeks meets saltwater from the nearshore ocean, creating a tidal basin that experiences frequent …
Grasslands
Grasslands include a variety of upland grass-dominated habitats, such as upland prairies, coastal bluffs, and montane grasslands.
Late Successional Mixed Conifer Forests
Late successional mixed conifer forests provide a multi-layered tree canopy, including large-diameter trees, shade-tolerant tree species in the understory, and a high volume of dead wood, such as snags and logs.
Natural Lakes
Natural lakes are relatively large bodies of freshwater surrounded by land that were formed through geological processes, such as glacial scouring, tectonic movements, volcanic activity and river meander cutoffs. In Oregon, natural lakes are defined as standing water bodies larger than 20 acres, including some seasonal lakes. Depth is not a reference for characterization of …
Oak Habitats
There are several oak habitat types in Oregon, where oaks comprise most of the canopy. These can include oak woodlands, oak forest, oak chaparral, and riparian oak. Oak savanna is covered in the Grasslands Key Habitat. Oaks may also co-dominate a canopy in oak/fir, oak pine, and oak hardwood habitats.
Flowing Water and Riparian Habitats
Flowing Water and Riparian Habitats include all naturally occurring flowing freshwater streams and rivers throughout Oregon as well as the adjacent riparian habitat.
Wetlands
Wetlands are habitats that are inundated or saturated by surface water or ground water at a frequency and duration sufficient to support vegetation typically adapted for life in sodden soil conditions. While dominated by periods of inundation, the natural ecological cycle may also include dry intervals. Permanently wet habitats include backwater sloughs, oxbow lakes, peatlands, …
Nearshore Key Habitats
Nearshore Habitats encompass the coastal and marine habitats in the area from the 3 nautical mile outer limit of Oregon’s territorial sea, where water depths average 66 m (216 ft) and range from 17 m to 194 m (56 to 308 ft), to the supratidal areas of the shoreline affected by wave spray and overwash …
Species of Greatest Conservation Need
American White Pelican (Modeled Habitat)
Pelecanus erythrorhynchos
Black Oystercatcher (Modeled Habitat)
Haematopus bachmani
California Myotis (Modeled Habitat)
Myotis californicus
Caspian Tern (Modeled Habitat)
Hydroprogne caspia
California Brown Pelican (Modeled Habitat)
Pelecanus occidentalis californicus
Cope’s Giant Salamander (Modeled Habitat)
Dicamptodon copei
Common Nighthawk (Modeled Habitat)
Chordeiles minor
Columbia Torrent Salamander (Modeled Habitat)
Rhyacotriton kezeri
Coastal Tailed Frog (Modeled Habitat)
Ascaphus truei
Fork-tailed Storm-Petrel (Modeled Habitat)
Oceanodroma furcata
Harlequin Duck (Modeled Habitat)
Histrionicus histrionicus
Hoary Bat (Modeled Habitat)
Lasiurus cinereus
Long-billed Curlew (Modeled Habitat)
Numenius americanus
Leach’s Storm-Petrel (Modeled Habitat)
Hydrobates leucorhoa
Long-legged Myotis (Modeled Habitat)
Myotis volans
Marbled Murrelet (Modeled Habitat)
Brachyramphus marmoratus
Northern Red-legged Frog (Modeled Habitat)
Rana aurora
Northern Spotted Owl (Modeled Habitat)
Strix occidentalis caurina
Olive-sided Flycatcher (Modeled Habitat)
Contopus cooperi
Pallid Bat (Modeled Habitat)
Antrozous pallidus
Red-necked Grebe (Holboell) (Modeled Habitat)
Podiceps grisegena holbollii
Rock Sandpiper (Modeled Habitat)
Calidris ptilocnemis tschuktschorum
Short-eared Owl (Modeled Habitat)
Asio flammeus flammeus
Silver-haired Bat (Modeled Habitat)
Lasionycteris noctivagans
Sierra Nevada Red Fox (Modeled Habitat)
Vulpes vulpes necator
Townsend’s Big-eared Bat (Modeled Habitat)
Corynorhinus townsendii
Trumpeter Swan (Modeled Habitat)
Cygnus buccinator
Tufted Puffin (Modeled Habitat)
Fratercula cirrhata
Oregon Vesper Sparrow (Modeled Habitat)
Pooecetes gramineus affinis
Western Meadowlark (Modeled Habitat)
Sturnella neglecta
Willow Flycatcher (Modeled Habitat)
Empidonax traillii
Western Snowy Plover (Modeled Habitat)
Anarhynchus nivosus nivosus