Priority Conservation Areas for the Willamette Valley - Puget Trough - Georgia Basin Ecoregion. October, 2003.
The Willamette Valley-Puget Trough-Georgia Basin ecoregion is a long ribbon of broad valley lowlands and inland sea flanked by the rugged Cascade and coastal mountain ranges of British Columbia, Washington, and Oregon. It encompasses some 5,550,000 ha of Pacific inlet, coastal lowlands, islands, and intermontane lowland, and extends from the Sunshine Coast and eastern lowland of Vancouver Island along Georgia Strait, south through Puget Sound and the extensive plains and river floodplains in the Willamette Valley.
Five expert technical teams collaborated on a series of analyses based on methods developed byThe Nature Conservancy and other scientists. Three teams covered the terrestrial environment’splants, animals and ecological systems. A fourth assessed the nearshore marine environmentwithin the Puget Sound and Georgia Strait. A fifth team studied the ecoregion’s freshwater systems.
Salmon were not addressed in this assessment.
The final portfolio includes 372 priority conservation areas with a combined area of 1,264,000 hectares (ha) (3,122,080 acres [ac]), representing 23 percent of the ecoregion’s total area. Thirty-nine shoreline segments totaling 89 kilometers (km) (55 miles [mi]) are also included.The portfolio includes the last places where many of the ecoregion’s most imperiled speciesoccur and the last, large expanses of relatively intact natural habitat. The sites included here are those regarded as having the highest likelihood of successful conservation according to the suitability factors utilized in the assessment.