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Juvenile Coho Salmon Diet in Brackish Freshwater Habitats in the Stream Estuaries of Coos Bay, Oregon (Mackereth, 2016)

2022-06-28T13:50:31+00:00

Loss of lowland estuarine and freshwater off-channel habitats along the Pacific Northwest coast has contributed to the decline of salmonid populations. These habitats serve as nursery grounds for juvenile salmonids providing them with food, winter shelter, and a transition zone between freshwater and saltwater. Lowland areas have undergone anthropogenic alterations (e.g., installation of tide gates, construction of dikes, channelization) to increase the net area of land suitable for agriculture and development resulting in watershed fragmentation and reduction in the amount of habitats with high intrinsic potential to support populations of juvenile salmonids. Until recent years, subyearling coho salmon found [...]

Juvenile Coho Salmon Diet in Brackish Freshwater Habitats in the Stream Estuaries of Coos Bay, Oregon (Mackereth, 2016)2022-06-28T13:50:31+00:00

Oregon Department of Fish & Wildlife Comments (NOAA, 2015)

2022-06-28T13:46:53+00:00

The following discussion, tables, and figures provide information for use by NOAA as part of the 2015 status review for the Oregon Coast Coho Salmon ESU. The status of Oregon Coast coho salmon has improved, largely as a result of actions identified in the Oregon Coast Coho Conservation Plan (OCCCP; http://www.dfw.state.or.us/fish/CRP/docs/coastal_coho/final/Coho_Plan.pdf). Hatchery and harvest issues have been addressed, watershed-based organizations have been created to coordinate habitat needs, significant investments have been made in habitat restoration, and the Oregon Plan for Salmon and Watersheds has established a framework for coordination among land managers and owners. ODFW considers the Oregon Coast [...]

Oregon Department of Fish & Wildlife Comments (NOAA, 2015)2022-06-28T13:46:53+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

Stream Evolution Model Integrating Habitat & Ecosystem Benefits (Thorne, 2013)

2022-06-28T13:44:13+00:00

For decades, Channel Evolution Models have provided useful templates for understanding morphological responses to disturbance associated with lowering base level, channelization or alterations to the flow and/or sediment regimes. In this paper, two well-established Channel Evolution Models are revisited and updated in light of recent research and practical experience. The proposed Stream Evolution Model includes a precursor stage, which recognizes that streams may naturally be multi-threaded prior to disturbance, and represents stream evolution as a cyclical, rather than linear, phenomenon, recognizing an evolutionary cycle within which streams advance through the common sequence, skip some stages entirely, recover to a [...]

Stream Evolution Model Integrating Habitat & Ecosystem Benefits (Thorne, 2013)2022-06-28T13:44:13+00:00

Scientific Conclusions of the Status Review for Oregon Coast Coho Salmon (NOAA, 2013)

2022-06-28T13:48:14+00:00

Beginning in the 1990s, the National Marine Fisheries Service (NMFS) conducted a series of reviews of the status of West Coast populations of Pacific salmon and steelhead (Oncorhynchus spp.) with respect to the U.S. Endangered Species Act (ESA). This report summarizes the scientific conclusions of the most recent status review of the Oregon Coast Coho Salmon (Oncorhynchus kisutch) (OCCS) Evolutionarily Significant Unit (ESU). VIEW PDF

Scientific Conclusions of the Status Review for Oregon Coast Coho Salmon (NOAA, 2013)2022-06-28T13:48:14+00:00

Restoring Salmon Habitat for a Changing Climate (Beechie et al, 2013)

2022-06-28T13:52:11+00:00

An important question for salmon restoration efforts in the western USA is ‘How should habitat restoration plans be altered to accommodate climate change effects on stream flow and temperature?’ We developed a decision support process for adapting salmon recovery plans that incorporates (1) local habitat factors limiting salmon recovery, (2) scenarios of climate change effects on stream flow and temperature, (3) the ability of restoration actions to ameliorate climate change effects, and (4) the ability of restoration actions to increase habitat diversity and salmon population resilience. To facilitate the use of this decision support framework, we mapped scenarios of [...]

Restoring Salmon Habitat for a Changing Climate (Beechie et al, 2013)2022-06-28T13:52:11+00:00

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