free hit counter

Bull Trout Trends and Abundance*

(DRAFT)

Coastal Recovery Unit

Willamette River Core AreaDeschutes River Core AreaHood River Core AreaKlickitat River Core AreaLewes River Core Area Abundance: 2,100 - 5,550
Trend: Stable

Historic and current activities have led to conditions that are limiting the abundance and productivity of bull trout in the Coastal Recovery Unit. Activities such as construction of impassable dams/culverts/diversions, land-use management, road construction/maintenance, and past fisheries management actions have affected the quality and quantity of riparian and aquatic conditions.

Throughout the recovery unit, dams/culverts/diversions: 1) prevent bull trout passage, 2) fragment habitat and population, and 3) degrade water quality and quantity.

Historic and present land-use practices (i.e., forestry, grazing, and agricultural) have degraded riparian and aquatic resources. Habitat degradation (riparian and in-stream) and impaired water quality/quantity are limiting bull trout abundance and productivity in all Coastal Recovery Unit core areas.

Construction and maintenance of road networks for forestry activities and general transportation have degraded habitat and water quality/quantity. Examples of some impacts associated with the transportation networks in the Coastal Recovery Unit include increased sediment loading, altered runoff patterns, restriction of normal stream channel movements and bank stabilization, and migration barriers.

Effects from past fishery management practices (non-native brook trout releases) continue to limit bull trout abundance and productivity. Brook trout present an on-going threat to bull trout through hybridization and possible competition for resources, as well as potential predation.

*The abundance and trend estimates represents summations of the information provided in the USFWS 5-Year Review. For a comprehensive review of the estimated abundance and trends, please refer to U.S. Fish and Wildlife Service. 2008. Bull Trout (Salvelinus confluentus) 5-Year Review: Summary and Evaluation. U.S. Fish and Wildlife Service. Portland, OR. 55 pp.

For a comprehensive review of the limiting factors affecting bull trout in this Core Area, please refer to:
http://www.fws.gov/pacific/bulltrout/RP/Chapter_20_%20Lower%20Columbia.pdf
http://www.fws.gov/pacific/bulltrout/RP/Chapter_7%20Deshutes.pdf
http://www.fws.gov/pacific/bulltrout/RP/Chapter_6%20Hood.pdf
http://www.fws.gov/pacific/bulltrout/RP/Chapter_5%20Willamette.pdf

Adapted From:
U.S. Fish and Wildlife Service. 2002. Chapter 20, Lower Columbia Recovery Unit, Washington. 89 p. In: U.S. Fish and Wildlife Service. Bull Trout (Salvelinus confluentus) Draft Recovery Plan. Portland, OR.

U.S. Fish and Wildlife Service. 2002. Chapter 7, Deschutes Recovery Unit, Oregon. 62 p. In: U.S. Fish and Wildlife Service. Bull Trout (Salvelinus confluentus) Draft Recovery Plan. Portland. OR.

U.S. Fish and Wildlife Service. 2002. Chapter 6, Hood River Recovery Unit, Oregon. 66 p. In: U.S. Fish and Wildlife Service. Bull Trout (Salvelinus confluentus) Draft Recovery Plan. Portland, OR.

U.S. Fish and Wildlife Service. 2002. Chapter 5, Willamette River Recovery Unit, Oregon. 96 p. In: U.S. Fish and Wildlife Service. Bull Trout (Salvelinus confluentus) Draft Recovery Plan. Portland, OR.