The Abundance and Distribution of Hatchery and Naturally Produced Chinook Salmon in Columbia River Estuary Nearshore Habitat

2021 ◽  
Author(s):  
Daniel L. Bottom ◽  
Susan A. Hinton ◽  
David J. Teel ◽  
G. Curtis Roegner ◽  
Lyndal L. Johnson ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
River Estuary ◽  
Columbia River ◽  
Columbia River Estuary ◽  
Nearshore Habitat ◽  
Abundance And Distribution

The influence of the Columbia River plume on the survival of steelhead (Oncorhynchus mykiss) and Chinook salmon (Oncorhynchus tshawytscha): a numerical exploration

2010 ◽  
Vol 67 (10) ◽  
pp. 1671-1684 ◽  
Author(s):  
Michela Burla ◽  
António M. Baptista ◽  
Edmundo Casillas ◽  
John G.  Williams ◽  
Douglas M.  Marsh
Keyword(s):  
Oncorhynchus Mykiss ◽  
Chinook Salmon ◽  
Large Scale ◽  
Oncorhynchus Tshawytscha ◽  
Numerical Models ◽  
River Estuary ◽  
Columbia River ◽  
River Plume ◽  
Columbia River Estuary ◽  
Columbia River Plume

Are smolt-to-adult return rates (SARs) for wild steelhead (i.e., sea-run rainbow trout, Oncorhynchus mykiss ) and wild Snake River spring–summer Chinook salmon ( Oncorhynchus tshawytscha ) related to changes in the Columbia River plume at the time that juvenile migrants enter the ocean? We used three-dimensional (3D) numerical models of the baroclinic circulation in the Columbia River estuary–plume–shelf system to simulate within-season variation in plume size and location, comparing the results with SARs for each day that juvenile salmon entered the ocean for 1999–2003. We found that steelhead benefited from the plume environment at a narrow window of time around their ocean entry. However, when large-scale ocean conditions turned unfavorable, the contribution of local plume conditions to the overall variability in steelhead survival became not significant. A similar evaluation revealed that the plume did not affect survival of Chinook salmon, at least at the fine scale of variability considered. The differential response between the two species is consistent with observed and previously reported behavioral characteristics they exhibit. We speculate that steelhead mainly use the plume to move quickly away from coastal habitats and the predation pressures associated with this environment, for a more direct migration than Chinook salmon to ocean habitats in the Gulf of Alaska.

Relative Vulnerability of PIT-Tagged Subyearling Fall Chinook Salmon to Predation by Caspian Terns and Double-Crested Cormorants in the Columbia River Estuary

2013 ◽  
Vol 142 (5) ◽  
pp. 1321-1334 ◽  
Author(s):  
Scott H. Sebring ◽  
Melissa C. Carper ◽  
Richard D. Ledgerwood ◽  
Benjamin P. Sandford ◽  
Gene M. Matthews ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
River Estuary ◽  
Columbia River ◽  
Columbia River Estuary ◽  
Caspian Terns ◽  
Relative Vulnerability
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