Insights into Estuary Habitat Loss in Western U.S. (Brophy et al, 2019)

2022-06-28T13:42:57+00:00

Effective conservation and restoration of estuarine wetlands require accurate maps of their historical and current extent, as well as estimated losses of these valued habitats. Existing coast-wide tidal wetland mapping does not explicitly map historical tidal wetlands that are now disconnected from the tides, which represent restoration opportunities; nor does it use water level models or high-resolution elevation data (e.g. lidar) to accurately identify current tidal wetlands. To better inform estuarine conservation and restoration, we generated new maps of current and historical tidal wetlands for the entire contiguous U.S. West Coast (Washington, Oregon, and California). The new maps are [...]

Insights into Estuary Habitat Loss in Western U.S. (Brophy et al, 2019)2022-06-28T13:42:57+00:00

Effects of Intertidal Water Crossing Structures on Estuarine Fish & Habitat (Munsch et al, 2017)

2022-06-28T13:42:49+00:00

For hundreds of years, people have built water crossing structures to enable the transportation of people, livestock, vehicles, and materials across rivers and other bodies of water. These structures have often created barriers to fish passage, an issue which has recently drawn intense scrutiny due to concerns over impacts to anadromous fish. While much work has focused on the impacts of freshwater crossing structures, intertidal structures have received less attention. This may be due to the importance of passage for adult anadromous fish in freshwater, and that bidirectional flows in intertidal environments complicate interpretation of structures as barriers. Intertidal [...]

Effects of Intertidal Water Crossing Structures on Estuarine Fish & Habitat (Munsch et al, 2017)2022-06-28T13:42:49+00:00

5-Year Review Summary Evaluation of Oregon Coast Coho Salmon (NOAA, 2016)

2022-06-28T13:48:20+00:00

Many West Coast salmon and steelhead (Oncorhynchus sp.) stocks have declined substantially from their historic numbers and now are at a fraction of their historical abundance. There are several factors that contribute to these declines, including: overfishing, loss of freshwater and estuarine habitat, hydropower development, poor ocean conditions, and hatchery practices. These factors collectively led to the National Marine Fisheries Service’s (NMFS) listing of 28 salmon and steelhead stocks in California, Idaho, Oregon, and Washington under the Federal Endangered Species Act (ESA). VIEW PDF

5-Year Review Summary Evaluation of Oregon Coast Coho Salmon (NOAA, 2016)2022-06-28T13:48:20+00:00

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

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

Estuarine Rearing Strategy Promoting Resilience in Coho Salmon (Koski, 2009)

2022-06-28T13:50:46+00:00

Adult coho salmon (Oncorhynchus kisutch) typically enter small coastal streams or tributaries of larger rivers in fall and usually ascend to the headwaters to spawn enabling their progeny to fill habitats throughout the system. Conventional understanding of coho salmon life history presumes that, following emergence from the redd in spring, coho fry take up residency in the stream for a year or more before migrating to sea in spring as smolts (Sandercock 1991). However, large numbers of fry (age 0, 1st year of life), typically move downstream following emergence. Chapman (1962) first coined the term “nomads” referring to those [...]

Estuarine Rearing Strategy Promoting Resilience in Coho Salmon (Koski, 2009)2022-06-28T13:50:46+00:00

Juvenile Coho Salmon Growth Survival Across Stream Network Seasonal Habitats (Ebersole et al, 2006)

2022-06-28T13:50:24+00:00

Understanding watershed-scale variation in juvenile salmonid survival and growth can provide insights into factors influencing demographics and can help target restoration and mitigation efforts for imperiled fish populations. We assessed growth, movement, and apparent overwinter survival of individually tagged juvenile coho salmon Oncorhynchus kisutch in a coastal Oregon watershed from June 2002 to June 2003 and related growth and survival parameters to stream characteristics. Fall body size of juvenile coho salmon was a good predictor of smolt size and survival, but smolt size was also influenced by overwintering location. This was due to strong spatial patterns in winter growth [...]

Juvenile Coho Salmon Growth Survival Across Stream Network Seasonal Habitats (Ebersole et al, 2006)2022-06-28T13:50:24+00:00

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