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

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

A Process‐Based Approach to Restoring Depositional River Valleys (Powers et al, 2018)

2022-06-28T13:40:46+00:00

Stream restoration approaches most often quantify habitat degradation, and therefore recovery objectives, on aquatic habitat metrics based on a narrow range of species needs (e.g., salmon and trout), as well as channel evolution models and channel design tools biased toward single‐threaded, and “sediment‐balanced” channel patterns. Although this strategy enhances perceived habitat needs, it often fails to properly identify the underlying geomorphological and ecological processes limiting species recovery and ecosystem restoration. In this paper, a unique process‐based approach to restoration that strives to restore degraded stream, river, or meadow systems to the premanipulated condition is presented. The proposed relatively simple [...]

A Process‐Based Approach to Restoring Depositional River Valleys (Powers et al, 2018)2022-06-28T13:40:46+00:00

Methods to Predict Beaver Dam Occurrence in Coastal Oregon (Petro et al, 2018)

2022-06-28T13:41:01+00:00

Pools provided by beaver (Castor canadensis) contribute to critical habitat requirements of salmonids in fluvial systems of the Pacific Northwest, therefore more land managers are interested in managing watersheds that include beavers or engaging in beaver-related restoration projects. We evaluated the utility of applying an existing beaver habitat suitability model to better understand beaver dam site characteristics in coastal Oregon, identify optimum dam site locations, and guide future beaver-related restoration efforts. We used a combination of t-tests, Wilcoxon rank sum tests, and a stepwise discriminant function analysis to examine stream habitat associations with field data collected at known and [...]

Methods to Predict Beaver Dam Occurrence in Coastal Oregon (Petro et al, 2018)2022-06-28T13:41:01+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

Freshwater Ecosystems & Resilience of Pacific Salmon: Habitat Management Based on Natural Variability (Bisson et al, 2009)

2022-06-28T13:45:12+00:00

In spite of numerous habitat restoration programs in fresh waters with an aggregate annual funding of millions of dollars, many populations of Pacific salmon remain significantly imperiled. Habitat restoration strategies that address limited environmental attributes and partial salmon life-history requirements or approaches that attempt to force aquatic habitat to conform to idealized but ecologically unsustainable conditions may partly explain this lack of response. Natural watershed processes generate highly variable environmental conditions and population responses, i.e., multiple life histories, that are often not considered in restoration. Examples from several locations underscore the importance of natural variability to the resilience of [...]

Freshwater Ecosystems & Resilience of Pacific Salmon: Habitat Management Based on Natural Variability (Bisson et al, 2009)2022-06-28T13:45:12+00:00

Freshwater Climate Effects on Aquatic Riparian Ecosystems (Mulholland et al, 1997)

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

This Phase 1 draft final report provides a first-ever compilation of what is known—and not known— about climate change effects on freshwater aquatic and riparian ecosystems in the geographic extent of the North Pacific Landscape Conservation Cooperative (NPLCC). The U.S. Fish and Wildlife Service funded this report to help inform members of the newly established NPLCC as they assess priorities and begin operations. Production of this report was guided by University of Washington‘s Climate Impacts Group and information was drawn from more than 250 documents and more than 100 interviews. A final report will be published in 2012 following [...]

Freshwater Climate Effects on Aquatic Riparian Ecosystems (Mulholland et al, 1997)2022-06-28T13:53:28+00:00

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