Two Alternative Juvenile Life History Types for Fall Chinook Salmon in the Snake River Basin

2005 ◽  
Vol 134 (2) ◽  
pp. 291-304 ◽  
Author(s):  
William P. Connor ◽  
John G. Sneva ◽  
Kenneth F. Tiffan ◽  
R. Kirk Steinhorst ◽  
Doug Ross
Keyword(s):  
Life History ◽  
River Basin ◽  
Chinook Salmon ◽  
Snake River

Movement and Spawner Distribution of Hatchery Fall Chinook Salmon Adults Acclimated and Released as Yearlings at Three Locations in the Snake River Basin

2004 ◽  
Vol 24 (4) ◽  
pp. 1134-1144 ◽  
Author(s):  
Aaron P. Garcia ◽  
William P. Connor ◽  
Deborah J. Milks ◽  
Stephen J. Rocklage ◽  
R. Kirk Steinhorst
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Snake River

scholarly journals Fall Chinook Salmon Spawning Ground Surveys in the Snake River Basin Upriver of Lower Granite Dam, 2004 Annual Report.

2005 ◽  
Author(s):  
A.P. Garcia ◽  
S. Bradbury ◽  
B.D. Arnsberg ◽  
S.J. Rocklage ◽  
P.A. Groves
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Annual Report ◽  
Snake River ◽  
Spawning Ground

scholarly journals Juvenile life-history diversity and population stability of spring Chinook salmon in the Willamette River basin, Oregon

2016 ◽  
Vol 73 (6) ◽  
pp. 921-934 ◽  
Author(s):  
R. Kirk Schroeder ◽  
Luke D. Whitman ◽  
Brian Cannon ◽  
Paul Olmsted
Keyword(s):  
Life History ◽  
River Basin ◽  
Chinook Salmon ◽  
Life Histories ◽  
Oncorhynchus Tshawytscha ◽  
Juvenile Salmon ◽  
Population Stability ◽  
Willamette River ◽  
June July ◽  
Willamette River Basin

Migratory and rearing pathways of juvenile spring Chinook salmon (Oncorhynchus tshawytscha) were documented in the Willamette River basin to identify life histories and estimate their contribution to smolt production and population stability. We identified six primary life histories that included two phenotypes for early migratory tactics: fry that migrated up to 140–200 km shortly after emergence (movers) and fish that reared for 8–16 months in natal areas (stayers). Peak emigration of juvenile salmon from the Willamette River was in June–July (subyearling smolts), March–May (yearling smolts), and November–December (considered as “autumn smolts”). Alternative migratory behaviors of juvenile salmon were associated with extensive use of diverse habitats that eventually encompassed up to 400 rkm of the basin, including tributaries in natal areas and large rivers. Juvenile salmon that reared in natal reaches and migrated as yearlings were the most prevalent life history and had the lowest temporal variability. However, the total productivity of the basin was increased by the contribution of fish with dispersive life histories, which represented over 50% of the total smolt production. Life-history diversity reduced the variability in the total smolt population by 35% over the weighted mean of individual life histories, providing evidence of a considerable portfolio effect through the asynchronous contributions of life histories. Protecting and restoring a diverse suite of connected habitats in the Willamette River basin will promote the development and expression of juvenile life histories, thereby providing stability and resilience to native salmon populations.

Growth and Long-Range Dispersal by Wild Subyearling Spring and Summer Chinook Salmon in the Snake River Basin

2001 ◽  
Vol 130 (6) ◽  
pp. 1070-1076 ◽  
Author(s):  
William P. Connor ◽  
Anne R. Marshall ◽  
Theodore C. Bjornn ◽  
Howard L. Burge
Keyword(s):  
Long Range ◽  
River Basin ◽  
Chinook Salmon ◽  
Snake River
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