scholarly journals Migrational Characteristics, Biological Observations, and Relative Survival of Juvenile Salmonids Entering the Columbia River Estuary, 1966-1983, 1985 Final Report of Research.

1986 ◽  
Author(s):  
Earl M. Dawley
Keyword(s):  
River Estuary ◽  
Relative Survival ◽  
Columbia River ◽  
Final Report ◽  
Columbia River Estuary ◽  
Juvenile Salmonids

scholarly journals Pair-Trawl Detection of PIT-Tagged Juvenile Salmonids Migrating in the Columbia River Estuary, 2008 Report of Research.

2009 ◽  
Author(s):  
Robert J. Magie ◽  
Matthew S. Morris ◽  
Richard D. Ledgerwood
Keyword(s):  
River Estuary ◽  
Columbia River ◽  
Columbia River Estuary ◽  
Juvenile Salmonids

Effect of Migration Pathway on Travel Time and Survival of Acoustic-Tagged Juvenile Salmonids in the Columbia River Estuary

2012 ◽  
Vol 141 (2) ◽  
pp. 507-519 ◽  
Author(s):  
Ryan A. Harnish ◽  
Gary E. Johnson ◽  
Geoffrey A. McMichael ◽  
Michael S. Hughes ◽  
Blaine D. Ebberts
Keyword(s):  
Travel Time ◽  
River Estuary ◽  
Columbia River ◽  
Columbia River Estuary ◽  
Juvenile Salmonids ◽  
Migration Pathway

Quantifying the effect of predators on endangered species using a bioenergetics approach: Caspian terns and juvenile salmonids in the Columbia River estuary

2003 ◽  
Vol 81 (2) ◽  
pp. 250-265 ◽  
Author(s):  
Daniel D Roby ◽  
Donald E Lyons ◽  
David P Craig ◽  
Ken Collis ◽  
G Henk Visser
Keyword(s):  
Endangered Species ◽  
River Basin ◽  
River Estuary ◽  
Columbia River ◽  
Energy Requirements ◽  
Columbia River Basin ◽  
Columbia River Estuary ◽  
Juvenile Salmonids ◽  
Caspian Terns ◽  
Caspian Tern

We estimated the consumption of juvenile salmonids (Oncorhynchus spp.) and other forage fishes by Caspian terns (Sterna caspia) nesting on Rice Island in the Columbia River estuary in 1997 and 1998 using a bioenergetics modeling approach. The study was prompted by concern that Caspian tern predation might be a substantial source of mortality to out-migrating juvenile salmonids from throughout the Columbia River basin, many populations of which are listed as threatened or endangered under the U.S. Endangered Species Act. The bioenergetics model used estimates of the energy requirements of the tern population and the proportion of tern energy requirements met by various prey types. The resulting estimate of the number of juvenile salmonids consumed by Rice Island Caspian terns was 8.1 million (5.9–10.4 million) in 1997 and 12.4 million (9.1–15.7 million) in 1998. Tern predation rates on juvenile salmonids were substantial, representing up to 15% of the juveniles to reach the estuary from some listed populations. Nevertheless, based on simple age-structured models of salmonid populations, it appears unlikely that management of Caspian tern predation alone would reverse salmonid declines. Management to reduce tern predation could, however, contribute to a comprehensive strategy to recover imperiled salmonid populations in the Columbia River basin.

scholarly journals Migratory Behavior and Survival of Juvenile Salmonids in the Lower Columbia River, Estuary, and Plume in 2010

2011 ◽  
Author(s):  
Geoffrey A. McMichael ◽  
Ryan A. Harnish ◽  
John R. Skalski ◽  
Katherine A. Deters ◽  
Kenneth D. Ham ◽  
...  
Keyword(s):  
River Estuary ◽  
Columbia River ◽  
Migratory Behavior ◽  
Columbia River Estuary ◽  
Juvenile Salmonids
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