scholarly journals Distribution and Movement of Steelhead and Anglers in the Clearwater River, Idaho

2019 ◽  
Vol 39 (5) ◽  
pp. 1056-1072 ◽  
Author(s):  
Stacey F. Feeken ◽  
Brett J. Bowersox ◽  
Marika E. Dobos ◽  
Matthew P. Corsi ◽  
Michael C. Quist ◽  
...  
Keyword(s):  
Clearwater River

scholarly journals Biogeochemical water type influences community composition, species richness, and biomass in megadiverse Amazonian fish assemblages

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Juan David Bogotá-Gregory ◽  
Flávio C. T. Lima ◽  
Sandra B. Correa ◽  
Cárlison Silva-Oliveira ◽  
David G. Jenkins ◽  
...  
Keyword(s):  
Species Richness ◽  
Community Composition ◽  
Fish Assemblages ◽  
Nutrient Content ◽  
Sediment Type ◽  
Water Type ◽  
High Transparency ◽  
Water Types ◽  
Amazonian Fish ◽  
Clearwater River

Abstract Amazonian waters are classified into three biogeochemical categories by dissolved nutrient content, sediment type, transparency, and acidity—all important predictors of autochthonous and allochthonous primary production (PP): (1) nutrient-poor, low-sediment, high-transparency, humic-stained, acidic blackwaters; (2) nutrient-poor, low-sediment, high-transparency, neutral clearwaters; (3) nutrient-rich, low-transparency, alluvial sediment-laden, neutral whitewaters. The classification, first proposed by Alfred Russel Wallace in 1853, is well supported but its effects on fish are poorly understood. To investigate how Amazonian fish community composition and species richness are influenced by water type, we conducted quantitative year-round sampling of floodplain lake and river-margin habitats at a locality where all three water types co-occur. We sampled 22,398 fish from 310 species. Community composition was influenced more by water type than habitat. Whitewater communities were distinct from those of blackwaters and clearwaters, with community structure correlated strongly to conductivity and turbidity. Mean per-sampling event species richness and biomass were significantly higher in nutrient-rich whitewater floodplain lakes than in oligotrophic blackwater and clearwater river-floodplain systems and light-limited whitewater rivers. Our study provides novel insights into the influences of biogeochemical water type and ecosystem productivity on Earth’s most diverse aquatic vertebrate fauna and highlights the importance of including multiple water types in conservation planning.

scholarly journals Quantitative testing of bedrock incision models for the Clearwater River, NW Washington State

2003 ◽  
Vol 108 (B6) ◽  
Author(s):  
Jonathan H. Tomkin ◽  
Mark T. Brandon ◽  
Frank J. Pazzaglia ◽  
Jonathan R. Barbour ◽  
Sean D. Willett
Keyword(s):  
Washington State ◽  
Clearwater River

An evaluation of the Clearwater River supplementation program in western Washington

2006 ◽  
Vol 63 (2) ◽  
pp. 423-437 ◽  
Author(s):  
Rishi Sharma ◽  
Gary Morishima ◽  
Shizhen Wang ◽  
André Talbot ◽  
Larry Gilbertson
Keyword(s):  
Coho Salmon ◽  
Reproductive Efficiency ◽  
Natural Environments ◽  
Brood Stock ◽  
Natural Origin ◽  
High Productivity ◽  
Western Washington ◽  
Queets River ◽  
Research Questions ◽  
Clearwater River

This paper presents preliminary results of a study to evaluate the potential utility of supplementation of natural origin coho salmon (Oncorhynchus kisutch) on the Clearwater River, a tributary of the Queets River in western Washington. The study, initiated in 1984, involves the collection of natural origin brood stock, rearing in a combination of hatchery and natural environments, and volitional releases, combined with marking and sampling of natural origin fish. Primary findings relative to five essential research questions of this study concluded that (i) smolts from supplementation returned at a lower rate than natural smolts; (ii) the reproductive efficiency (spawner to spawner) of fish taken for supplementation was higher than that for fish allowed to spawn naturally; (iii) supplemental fish successfully reproduced and the combined supplemental–natural spawning population had a high productivity; (iv) supplementation did not appear to have affected the overall reproductive performance of the population for the duration of the project; and (v) supplementation increased the overall spawner return on the Clearwater River and is required to maximize adult production, unless conditions in both freshwater and ocean environments are optimal.

Sign in / Sign up

Export Citation Format

Share Document