scholarly journals Population Structure of Columbia River Basin Chinook Salmon and Steelhead Trout, Technical Report 2001.

2002 ◽  
Author(s):  
E.L. Brannon
Keyword(s):  
Population Structure ◽  
River Basin ◽  
Chinook Salmon ◽  
Columbia River ◽  
Columbia River Basin ◽  
Steelhead Trout ◽  
Technical Report

Population Structure of Columbia River Basin Chinook Salmon and Steelhead Trout

2004 ◽  
Vol 12 (2-3) ◽  
pp. 99-232 ◽  
Author(s):  
ERNEST L. BRANNON ◽  
MADISON S. POWELL ◽  
THOMAS P. QUINN ◽  
ANDRÉ TALBOT
Keyword(s):  
Population Structure ◽  
River Basin ◽  
Chinook Salmon ◽  
Columbia River ◽  
Columbia River Basin ◽  
Steelhead Trout

Influence of pinniped-caused injuries on the survival of adult Chinook salmon (Oncorhynchus tshawytscha) and steelhead trout (Oncorhynchus mykiss) in the Columbia River basin

2011 ◽  
Vol 68 (9) ◽  
pp. 1615-1624 ◽  
Author(s):  
George P. Naughton ◽  
Matthew L. Keefer ◽  
Tami S. Clabough ◽  
Michael A. Jepson ◽  
Steven R. Lee ◽  
...  
Keyword(s):  
Oncorhynchus Mykiss ◽  
River Basin ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Columbia River ◽  
Columbia River Basin ◽  
Small Fish ◽  
Steelhead Trout ◽  
Large Fish ◽  
Density Dependent

Increasing pinniped abundance in the Pacific Northwest has coincided with population declines of Pacific salmon ( Oncorhynchus  spp.) and steelhead trout ( Oncorhynchus mykiss ), and concentrated predation may affect the recovery of some threatened and endangered salmonid stocks. We used radiotelemetry to evaluate pinniped-caused injury effects on migration survival of 17 007 adult Columbia River Chinook salmon ( Oncorhynchus tshawytscha ) and steelhead trout. Injuries from pinnipeds were common (mean injury rate across 29 run-years = 36.5%) and were most common for spring Chinook salmon and steelhead trout. Injury was not consistently associated with adult survival to spawning tributaries, but some negative survival effects were detected. Pinniped-caused injury rates decreased as annual run sizes increased, indicating density-dependent or saturation effects. Within a run, large fish generally had a higher injury incidence than small fish, suggesting pinnipeds targeted large fish or more efficiently captured small fish. Seasonal, size-dependent, and density-dependent results imply that pinniped effects likely differ widely among salmonid populations within the Columbia River basin. A better understanding of these effects is needed to guide management and conservation strategies.

Stock-Specific Migration Timing of Adult Spring–Summer Chinook Salmon in the Columbia River Basin

2004 ◽  
Vol 24 (4) ◽  
pp. 1145-1162 ◽  
Author(s):  
Matthew L. Keefer ◽  
Christopher A. Peery ◽  
Michael A. Jepson ◽  
Kenneth R. Tolotti ◽  
Theodore C. Bjornn ◽  
...  
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Columbia River ◽  
Columbia River Basin ◽  
Migration Timing
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