Evaluating Cumulative Ecosystem Response to Restoration Projects in the Columbia River Estuary, Annual Report 2006

Johnson, Gary E.; Borde, Amy B.; Dawley, Earl M.; Diefenderfer, Heida L.; Ebberts, Blaine D.; Putman, Douglas A.; Roegner, G. Curtis; Thom, Ronald M.; Vavrinec, John; Whiting, Allan H.

doi:10.2172/921262

Cited by 8 publications

(1 citation statement)

References 88 publications

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“…). The timing of Chum Salmon in our catch is consistent with the typical migration season of these populations (Myers and Holton ; Johnson ) and with other recent reports of Chum Salmon occurrence in the LCRE (Roegner et al. ; Johnson et al.…”

Section: Discussionsupporting

confidence: 92%

Juvenile Salmonid Assemblages at the Mirror Lake Complex in the Lower Columbia River before and after a Culvert Modification

Sol

Hanson

Marcoe

et al. 2018

N American J Fish Manag

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This study examined salmonid assemblages upstream of a culvert connecting the Mirror Lake Complex with the lower Columbia River before and after the culvert was modified to improve habitat connectivity and fish passage. Initially the culvert limited water flow between the Columbia River and the Mirror Lake Complex. The outlet and interior of the culvert were reconfigured to create a more “natural” and suitable passageway for salmonids through the removal of riprap and the strategic placement of boulders, cobbles, gravels, baffles, and weirs. Prior to the culvert modification, three sites were sampled monthly between April and August of 2008, 5.0 and 0.5 km upstream of the culvert and immediately downstream of the culvert. After the culvert modification, the same sites were sampled from 2009 to 2012, with two additional sites added in 2010. Sites near the culvert supported Chinook Salmon Oncorhynchus tshawytscha, Coho Salmon O. kisutch, and Chum Salmon O. keta, while sites further from the culvert supported unmarked Coho Salmon and Rainbow Trout O. mykiss, steelhead (anadromous Rainbow Trout), and Cutthroat Trout O. clarkii. Clear trends in salmonid occurrence were not observed, although densities of Chinook Salmon tended to be higher in years postmodification than before modification. Culvert modifications should focus on alleviating site‐specific fish passage conditions to result in substantial changes to habitat connectivity.

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Section: Discussionsupporting

confidence: 92%

Juvenile Salmonid Assemblages at the Mirror Lake Complex in the Lower Columbia River before and after a Culvert Modification

Sol

Hanson

Marcoe

et al. 2018

N American J Fish Manag

View full text Add to dashboard Cite

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A methodology for the classification of estuary restoration areas: A management tool

Jiménez

Castanedo

Medina

et al. 2012

Ocean & Coastal Management

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Estuarine Habitat and Juvenile Salmon: Current and Historical Linkages in the Lower Columbia River and Estuary

Bottom¹,

Baptista²,

Burke³

et al. 2011

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Prescribed by ANSI Std Z39-18 Performance Metrics: Population Structure, Life History Diversity, and Growth 8. Different genetic stock groups of Chinook salmon exhibit characteristic patterns of temporal and spatial distribution in the lower estuary. Genetic stock groups in the lower estuary were not uniformly distributed but exhibited distinct temporal and spatial patterns. Fall-run juveniles from the West Cascade and Spring Creek Group stocks (both from the Lower Columbia River Chinook Salmon ESU) dominated shallow habitats of the lower estuary. Whereas the Spring Creek Group fall stocks were widely distributed and abundant primarily during spring, proportions of the West Cascade fall stock generally increased with distance from the estuary mouth and were well represented from spring through fall. Representatives from the Upper Columbia River summer/fall stock group were distributed throughout the estuary, but few appeared in our samples until summer and fall. No consistent differences in stock composition were apparent at finer scales (i.e., habitat scales). To determine restoration priorities for at-risk salmon, further investigation is needed on stock-specific patterns of estuary habitat use, particularly in the poorly studied tidalfluvial reaches between rkm 100 and Bonneville Dam. 9. Most Chinook salmon Evolutionarily Significant Units (ESUs) are capable of expressing subyearling life histories. Both lower and upper Columbia River stock groups can produce subyearlings that reside in the estuary for several months. Subyearling Chinook salmon from all ESUs occupied shallow-water habitats of the lower estuary, except for spring run groups from the interior Columbia River basin. Otolith collections from Pt. Adams Beach indicated that subyearlings from a diverse subset of these ESUs expressed estuary-resident life histories. Back-calculations using otolith chemical analyses indicated that size at saltwater entry for lower Columbia River fall stocks (West Cascade and Spring Creek Group) averaged near 60 mm FL. Mean residence times in the saltwater portion of the estuary were estimated at between 1 and 2 months. Although the average back-calculated size at entry for Upper Columbia River summer/fall collections (n = 9) was much larger (88 mm FL), the estimated period of estuary residency averaged 2 months or more. Estimates from otolith analyses indicated positive growth rates for estuary-rearing salmon during all seasons, including maximum mean values of 0.55 mm day-1 during late summer (August). However, by this time, water temperatures in much of the estuary had increased to high levels, and salmon abundance had declined substantially. We have no measure of the daily rations or water temperatures that supported our growth rate estimates, which were back-calculated from otolith increment widths for individuals xiii captured near the river mouth (Pt. Adams Beach). Bioenergetic modeling may offer the best tool to investigate further the interactive effects of water temperature, salmon densities, and prey availabil...

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Evaluating Cumulative Ecosystem Response to Restoration Projects in the Columbia River Estuary, Annual Report 2006

Cited by 8 publications

References 88 publications

Juvenile Salmonid Assemblages at the Mirror Lake Complex in the Lower Columbia River before and after a Culvert Modification

Juvenile Salmonid Assemblages at the Mirror Lake Complex in the Lower Columbia River before and after a Culvert Modification

A methodology for the classification of estuary restoration areas: A management tool

Estuarine Habitat and Juvenile Salmon: Current and Historical Linkages in the Lower Columbia River and Estuary

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