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

Summer Streamflow Deficits from Regenerating Douglas‐fir Forest in the Pacific Northwest (Perry & Jones, 2016)

2022-06-28T13:41:43+00:00

Despite controversy about effects of plantation forestry on streamflow, streamflow response to forest plantations over multiple decades is not well understood. Analysis of 60‐year records of daily streamflow from eight paired‐basin experiments in the Pacific Northwest of the United States (Oregon) revealed that the conversion of old‐growth forest to Douglas‐fir plantations had a major effect on summer streamflow. Average daily streamflow in summer (July through September) in basins with 34‐ to 43‐year‐old plantations of Douglas‐fir was 50% lower than streamflow from reference basins with 150‐ to 500‐year‐old forests dominated by Douglas‐fir, western hemlock, and other conifers. Study plantations are [...]

Summer Streamflow Deficits from Regenerating Douglas‐fir Forest in the Pacific Northwest (Perry & Jones, 2016)2022-06-28T13:41:43+00:00

Ecosystem Experiment Reveals Benefits of Natural & Simulated Beaver Dams to a Threatened Population of Steelhead (Bouwes et al, 2016)

2022-06-28T13:44:40+00:00

Beaver have been referred to as ecosystem engineers because of the large impacts their dam building activities have on the landscape; however, the benefits they may provide to fluvial fish species has been debated. We conducted a watershed-scale experiment to test how increasing beaver dam and colony persistence in a highly degraded incised stream affects the freshwater production of steelhead (Oncorhynchus mykiss). Following the installation of beaver dam analogs (BDAs), we observed significant increases in the density, survival, and production of juvenile steelhead without impacting upstream and downstream migrations. The steelhead response occurred as the quantity and complexity of [...]

Ecosystem Experiment Reveals Benefits of Natural & Simulated Beaver Dams to a Threatened Population of Steelhead (Bouwes et al, 2016)2022-06-28T13:44:40+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

Social Ecological Resilience in Salmon Ecosystems (Bottom et al, 2009)

2022-06-28T13:51:55+00:00

Fishery management programs designed to control Pacific salmon (Oncorhynchus spp.) for optimum production have failed to prevent widespread fish population decline and have caused greater uncertainty for salmon, their ecosystems, and the people who depend upon them. In this special feature introduction, we explore several key attributes of ecosystem resilience that have been overlooked by traditional salmon management approaches. The dynamics of salmon ecosystems involve social–ecological interactions across multiple scales that create difficult mismatches with the many jurisdictions that manage fisheries and other natural resources. Of particular importance to ecosystem resilience are large-scale shifts in oceanic and climatic regimes [...]

Social Ecological Resilience in Salmon Ecosystems (Bottom et al, 2009)2022-06-28T13:51:55+00:00

The Effects of Temperature on Steelhead Trout, Coho Salmon, and Chinook Salmon Biology and Function by Life Stage (Carter, 2005)

2022-06-28T13:44:31+00:00

Temperature is one of the most important environmental influences on salmonid biology. Most aquatic organisms, including salmon and steelhead, are poikilotherms, meaning their temperature and metabolism is determined by the ambient temperature of water. Temperature therefore influences growth and feeding rates, metabolism, development of embryos and alevins, timing of life history events such as upstream migration, spawning, freshwater rearing, and seaward migration, and the availability of food. Temperature changes can also cause stress and lethality (Ligon et al. 1999). Temperatures at sub-lethal levels can effectively block migration, lead to reduced growth, stress fish, affect reproduction, inhibit smoltification, create disease [...]

The Effects of Temperature on Steelhead Trout, Coho Salmon, and Chinook Salmon Biology and Function by Life Stage (Carter, 2005)2022-06-28T13:44:31+00:00

Appendix to the Oregon Coastal Coho Conservation Management Plan (OR Fish & Wildlife, 2004)

2022-06-28T13:45:34+00:00

Early in 2004, the State of Oregon and the National Marine Fisheries Service (NOAA Fisheries) joined together to engage in a collaborative project to address the conservation of coastal coho on the Oregon Coast. The primary objectives of the project, presented at the formation meeting of the Stakeholder Team... VIEW PDF

Appendix to the Oregon Coastal Coho Conservation Management Plan (OR Fish & Wildlife, 2004)2022-06-28T13:45:34+00:00

Viable Salmonid Populations Unit Recovery (NOAA, 2000)

2022-06-28T13:45:42+00:00

This document introduces the viable salmonid population (VSP) concept, identifies VSP attributes, and provides guidance for determining the conservation status of populations and larger-scale groupings of Pacific salmonids. The concepts outlined here are intended to serve as the basis for a general approach to performing salmonid conservation assessments. As a specific application, the VSP approach is intended help in the establishment of Endangered Species Act (ESA) delisting goals. This will aid in the formulation of recovery plans and can serve as interim guidance until such plans are completed. VIEW PDF

Viable Salmonid Populations Unit Recovery (NOAA, 2000)2022-06-28T13:45:42+00:00
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