2019 State of Oregon Coast Coho 12 Year Assessment, Appendix I (OR Fish & Wildlife Commission, 2021)

2022-06-28T13:47:30+00:00

The Oregon Coast Coho Conservation Plan (OCCCP) provides criteria, metrics, and goals for abundance, persistence, productivity, distribution, diversity, and habitat condition. Criteria, metrics and goals for the Oregon Coast Coho Evolutionarily Significant Unit (OC Coho ESU) and Independent Populations are summarized below. Criteria, metrics and goals for Dependent Populations are described in Section II. Additional details can be found in OCCCP Appendix 2, Desired Status: Measurable Criteria for the Oregon Coast Coho Conservation Plan for the State of Oregon. VIEW PDF

2019 State of Oregon Coast Coho 12 Year Assessment, Appendix I (OR Fish & Wildlife Commission, 2021)2022-06-28T13:47:30+00:00

Juvenile Coho Salmon Movement, Growth & Survival (Bell, 2021)

2022-06-28T13:50:14+00:00

Juvenile salmonids display highly variable spatial and temporal patterns of early dispersal that are influenced by density-dependent and density-independent factors. Although juvenile coho salmon (Oncorhynchus kisutch) movement patterns in streams and their relationship with body mass and growth have been examined in previous studies, most observations were limited to one season or one stream section. In this study, we monitored the movement of juvenile coho salmon throughout their period of residence in a coastal basin to identify prevalent dispersal strategies and their relationships with body mass, growth rates and survival. Our results revealed seasonally and spatially variable movement patterns. [...]

Juvenile Coho Salmon Movement, Growth & Survival (Bell, 2021)2022-06-28T13:50:14+00:00

Ecological Effects of Tide Gate Upgrade or Removal (Oregon Watershed Enhancement Board, 2018)

2022-06-28T13:40:31+00:00

This document reports on findings, conclusions and recommendations derived from scientific literature and knowledge regarding the effectiveness of tide gate removal or upgrade in improving conditions for Oregon’s native migratory fish species, particularly salmonids, and other plant and animal species that utilize estuarine ecosystems. The project was commissioned by the Oregon Watershed Enhancement Board (OWEB) to foster better understanding of the effectiveness of their past investments in estuary habitat restoration involving tide gates, and to aid in targeting future investments. This will be especially important because many less-complicated projects (e.g. those on public land, smaller, single-action projects, those with [...]

Ecological Effects of Tide Gate Upgrade or Removal (Oregon Watershed Enhancement Board, 2018)2022-06-28T13:40:31+00:00

Spatial Pattern of Fall Movement of Juvenile Coho Salmon in the West Fork Smith River, Oregon (Hance et al, 2016)

2022-06-28T13:49:19+00:00

For several species of Pacific salmon (Oncorhynchus spp.) inhabiting coastal temperate streams, juvenile fish have been recorded moving between mainstem and tributary habitats during the transition from the summer dry season to the winter wet season. Such movement that connects summer and winter habitats may be particularly important for coho salmon, O. kisutch, because availability of overwintering habitat can limit freshwater survival for this species. Here, I describe basin-scale variability in the spatial pattern of fall movement for juvenile coho salmon between mainstem and tributary streams during the fall of 2002, 2003, 2004, and 2005. Juvenile coho salmon were [...]

Spatial Pattern of Fall Movement of Juvenile Coho Salmon in the West Fork Smith River, Oregon (Hance et al, 2016)2022-06-28T13:49:19+00:00

Riverscape Patterns Juvenile Coho Salmon in Midcoastal Oregon (Flitcroft et al, 2014)

2022-06-28T13:49:25+00:00

Patterns of salmon distribution throughout a riverscape may be expected to change over time in response to environmental conditions and population sizes. Changing patterns of use, including identification of consistently occupied locations, are informative for conservation and recovery planning. We explored interannual patterns of distribution by juvenile Coho Salmon Oncorhynchus kisutch in 11 subbasins on the midcoast of Oregon. We found that juvenile Coho Salmon distribution expanded and contracted around stream sections that were continuously occupied (core areas). Timing of expansion or contraction was synchronous among subbasins and appeared to be related to the size of the parental spawning [...]

Riverscape Patterns Juvenile Coho Salmon in Midcoastal Oregon (Flitcroft et al, 2014)2022-06-28T13:49:25+00:00

Geographic Variation in Environmental Factors Outmigration Timing of Coho Salmon Smolts (Spence, 2014)

2022-06-28T13:50:38+00:00

The environmental cues that regulate smoltification and trigger downstream movement by salmon should vary across space in response to differences in the predictability of favorable conditions for migration and ocean entry. To examine this, we modeled the short-term outmigration probability of four coho salmon (Oncorhynchus kisutch) populations in three distinct geographic regions in relation to photoperiod, temperature, streamflow, lunar phase, and interactions among these variables. For smolts in Deer and Flynn creeks, Oregon (1960–1972), migration probability was influenced by numerous factors, including photoperiod, temperature (absolute and change), flow (absolute and change), and lunar phase, with certain factors interacting. Smolts [...]

Geographic Variation in Environmental Factors Outmigration Timing of Coho Salmon Smolts (Spence, 2014)2022-06-28T13:50:38+00:00

Contribution of Migrant Coho Salmon to Spawning Populations on the S. Oregon Coast (Nordholm, 2014)

2022-06-28T13:51:32+00:00

The typical coho salmon life history has been characterized by juvenile fish that spend their entire first year in freshwater habitats before migrating into estuaries as smolts. However, reports of early migrating coho fry (age 0), including migration downstream to estuarine habitats, date back to the 1960s. Until a few years ago, these individuals were considered to be displaced surplus fish with low chances of survival. Recent studies have suggested that subyearling estuarine migrating coho salmon could be an alternative life history in coastal populations, but their return as jacks or mature adults needed to be documented for this [...]

Contribution of Migrant Coho Salmon to Spawning Populations on the S. Oregon Coast (Nordholm, 2014)2022-06-28T13:51:32+00:00

Climatic Influences on the Productivity of Salmon Populations (Rogers et al, 2011)

2022-06-28T13:53:51+00:00

Ecological studies relating population parameters to climate conditions are limited by a lack of experimental control systems and rely instead on correlative evidence to draw inferences about how populations respond to environmental forcing. Consequently, some correlations turn out to be spurious and not ecologically meaningful. To strengthen inferences, multiple populations may be examined simultaneously to confirm whether relationships can be generalized across multiple systems; however, this assumes that populations respond similarly to climate drivers, ignoring the potential for ecological complexity. Using data on eight sockeye salmon populations from southwestern Alaska, we constructed a series of models based on ecological [...]

Climatic Influences on the Productivity of Salmon Populations (Rogers et al, 2011)2022-06-28T13:53:51+00:00

Juvenile Coho Salmon Movement & Migration Through Tide Gates (Bass, 2010)

2022-06-28T13:45:25+00:00

Tidal marshlands in the upper estuary ecotone provide essential habitat for juvenile salmonids. In this environment, salmonids grow rapidly and acclimate to saltwater. Worldwide, tidal marshes have been diked and drained to provide agricultural and residential land. Tide gates are one-way doors integrated into dike systems that prevent saltwater flooding and allow upland drainage to the estuary during low tide. By preventing tidal exchange, tide gates have significant upstream effects on water temperature and chemistry, plant and animal community structure, and geomorphology. Since they are closed most of the day and may be difficult to pass when open, tide [...]

Juvenile Coho Salmon Movement & Migration Through Tide Gates (Bass, 2010)2022-06-28T13:45:25+00:00

Coho Salmon Life History Patterns in the Pacific Northwest California (Lestelle, 2007)

2022-06-28T13:51:41+00:00

In 1997 coho salmon (Oncorhynchus kisutch) in the Klamath River basin, as part of the Southern Oregon Northern California Coasts evolutionary significant unit (SONCC Coho ESU), were listed as threatened under the Endangered Species Act (ESA). The National Marine Fisheries Service (NMFS) cited water management, water quality, loss of habitat, overfishing, and other factors as causing a serious decline of the species within this ESU. VIEW PDF

Coho Salmon Life History Patterns in the Pacific Northwest California (Lestelle, 2007)2022-06-28T13:51:41+00:00

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