Cumulative Effects of Avian Predation on Upper Columbia River Steelhead

2019 ◽  
Vol 148 (5) ◽  
pp. 896-913
Author(s):  
Allen F. Evans ◽  
Quinn Payton ◽  
Bradley M. Cramer ◽  
Ken Collis ◽  
Nathan J. Hostetter ◽  
...  
Keyword(s):  
Columbia River ◽  
Cumulative Effects ◽  
Avian Predation

scholarly journals Avian Predation on Juvenile Salmonids in the Lower Columbia River: 1997 Annual Report.

1998 ◽  
Author(s):  
Daniel D. Roby ◽  
David P. Craig ◽  
Ken Collis ◽  
Stephanie L. Adamany
Keyword(s):  
Annual Report ◽  
Columbia River ◽  
Avian Predation ◽  
Juvenile Salmonids

Late-season mortality during migration of radio-tagged adult sockeye salmon (Oncorhynchus nerka) in the Columbia River

2005 ◽  
Vol 62 (1) ◽  
pp. 30-47 ◽  
Author(s):  
George P Naughton ◽  
Christopher C Caudill ◽  
Matthew L Keefer ◽  
Theodore C Bjornn ◽  
Lowell C Stuehrenberg ◽  
...  
Keyword(s):  
Sockeye Salmon ◽  
Negative Impact ◽  
Oncorhynchus Nerka ◽  
Columbia River ◽  
River System ◽  
Cumulative Effects ◽  
Negative Effects ◽  
Temperature Regimes ◽  
Migration Corridor ◽  
Passage Times

We radio-tagged 577 adult sockeye salmon (Oncorhynchus nerka) returning to the Columbia River in 1997 to determine how migration behaviors were related to migration success in an altered river system. The probability of successful migration declined dramatically for late-entry individuals, concomitant with declines in discharge and the onset of stressful temperatures. Long dam passage times were not related to unsuccessful migration at most dams. However, when migration histories were analyzed across multiple dams or reservoirs, relatively slow migration was significantly associated with unsuccessful migration, suggesting potential cumulative effects. Median passage times at dams were rapid (7.9–33.4 h), although 0.2%–8% of salmon took more than 5 days to pass. Reservoir passage was also rapid, averaging 36.8–61.3 km·day–1, and appeared to compensate for slowed migration at dams. Rates observed in the unimpounded Hanford Reach suggest that total predam migration rates may have been similar to current rates. Overall, our results suggest that cumulative effects may be more important than negative effects of passage at single dams and that hydrosystem alteration of temperature regimes in the migration corridor may have an important indirect negative impact on adults.

scholarly journals Avian Predation on Juvenile Salmonids in the Lower Columbia River: 1998 Annual Report.

2000 ◽  
Author(s):  
Ken Collis ◽  
Stephanie Adamany ◽  
Daniel D. Roby ◽  
David P. Craig ◽  
Donald E. Lyons
Keyword(s):  
Annual Report ◽  
Columbia River ◽  
Avian Predation ◽  
Juvenile Salmonids
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