Sediment mobility and river corridor assessment for a 140-kilometer segment of the main-stem Klamath River below Iron Gate Dam, California

Curtis, Jennifer A.; Poitras, Travis B.; Bond, Sandra; Byrd, Kristin B.

doi:10.3133/ofr20201141

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Over the long term, the restoration of more natural and variable flow and sediment regimes will decrease annelid habitat suitability (stability) and prevent establishment of high-density populations (Jordan, 2012;Alexander et al, 2014;Alexander et al, 2016). The predicted increases in frequency of events that disturb substrate and attached periphyton (threshold critical flow events, Curtis et al, 2021) should drive patchier annelid distribution and lower densities overall as a result of mechanical scour and flushing (Alexander et al, 2016). In particular, high density annelid populations within the pre-dam-removal-infectious-zone (within S2), should be reduced greatly after dam removal.…”

Section: Impacts On Annelid Hostsmentioning

confidence: 99%

Deconstructing dams and disease: predictions for salmon disease risk following Klamath River dam removals

Bartholomew,

Alexander,

Alvarez

et al. 2023

Front. Ecol. Evol.

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The health of fish populations and the river systems they inhabit have broad ecological, cultural, recreational, and economic relevance. This is exemplified by the iconic anadromous salmonid fishes native to the West Coast of North America. Salmon populations have been constrained since the mid nineteenth century by dam construction and water reallocation. In the Klamath River (Oregon and California, USA), a series of dams built in the early-mid 20th century cut the basin in two and blocked anadromous fish access to more than 600 river kilometers. This dramatic loss of habitat, coupled with infectious diseases and resulting epizootics, have impacted the wellbeing of these salmonid populations. In 2023-2024, the Klamath River will undergo the largest river restoration project in US history. Removal of the four lowermost dams will cause profound physical changes to the river, including flow, water temperature, and channel geomorphology. The dam removals will reconnect the lower and upper portions of the basin, and provide fish passage after a century of segregation. Reestablishment of upstream and downstream fish movements will also alter the occupancy and abundance of the salmonid hosts and their pathogens. The increased habitat availability and longer migration routes will increase duration of pathogen exposure and potential impacts on juvenile survival and adult pre-spawn mortality. However, restoration of more natural flow and sediment regimes will decrease overall fish disease risk by disrupting complex parasite life cycles. To better understand these multifarious, competing factors, we review the salmonid species in the Klamath River, and provide an overview of their historical pathogen challenges and associated diseases and use this as a framework to predict the effects of dam removals on disease dynamics. Our review and predictions are a synthesis of expertise from tribal biologists, fish health specialists and fish biologists, many of whom have lived and worked on the Klamath River for decades. We conclude with recommendations for expansion of current pathogen monitoring and research efforts to measure changes in host-pathogen dynamics basin-wide.

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Section: Impacts On Annelid Hostsmentioning

confidence: 99%

Deconstructing dams and disease: predictions for salmon disease risk following Klamath River dam removals

Bartholomew,

Alexander,

Alvarez

et al. 2023

Front. Ecol. Evol.

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“…In this river system, 3 types of flow are utilized to mitigate C. shasta (Hillemeier et al ., 2017) and their influence on disease dynamics depends upon their timing (season), magnitude and duration. For example, a deep flushing flow of high discharge for short duration (approximating a 5–10 year magnitude flood, 24 h) in spring every other year is prescribed to move armoured bed layer sediments and reduce annelid populations (Curtis et al ., 2021). A surface flushing flow of moderate discharge (equivalent to ~2–5 year interval magnitude flood) for 72 h every winter moves surface (fine) sediments, again to reduce annelid populations.…”

Section: Management and Controlmentioning

confidence: 99%

Ceratonova shasta: a cnidarian parasite of annelids and salmonids

et al. 2022

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The myxozoan Ceratonova shasta was described from hatchery rainbow trout over 70 years ago. The parasite continues to cause severe disease in salmon and trout, and is recognized as a barrier to salmon recovery in some rivers. This review incorporates changes in our knowledge of the parasite's life cycle, taxonomy and biology and examines how this information has expanded our understanding of the interactions between C. shasta and its salmonid and annelid hosts, and how overarching environmental factors affect this host–parasite system. Development of molecular diagnostic techniques has allowed discrimination of differences in parasite genotypes, which have differing host affinities, and enabled the measurement of the spatio-temporal abundance of these different genotypes. Establishment of the C. shasta life cycle in the laboratory has enabled studies on host–parasite interactions and the availability of transcriptomic data has informed our understanding of parasite virulence factors and host defences. Together, these advances have informed the development of models and management actions to mitigate disease.

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Reservoir evolution, downstream sediment transport, downstream channel change, and synthesis of geomorphic responses of Fall Creek and Middle Fork Willamette River to water years 2012–18 streambed drawdowns at Fall Creek Lake, Oregon

Keith,

Wallick,

Schenk

et al. 2024

Scientific Investigations Report

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with the U.S. Army Corps of Engineers. Brian Bangs (formerly with the Oregon Department of Fish and Wildlife, now U.S. Fish and Wildlife Service) provided insights on processes and habitat responses to streambed drawdowns in the reaches downstream from Fall Creek Dam. John and Pam Baumann, Pat and Kerney Simpson, Jeff and Joan Devore, and Carol Brewer (residents, landowners, and land managers along Fall Creek and the Middle Fork Willamette River) provided access to monitoring sites and shared observations regarding channel conditions and streambed drawdown operations at Fall Creek Lake. Melissa Olson and Jason Nuckols with The Nature Conservancy provided access to field monitoring sites and perspectives on channel changes. Audrey Squires and Sarah Dyrdahl (both formerly with the Middle Fork Willamette Watershed Council) contributed knowledge of the Middle Fork Willamette River Basin. Audrey also assisted with field surveys. Mikel Calle Navarro (formerly with El Museo Nacional de Ciencias Naturales) provided field assistance. Aerial imagery was provided by Frontier Precision (Chase Fly) and Brown-Western Aviation (Gary and

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Sediment mobility and river corridor assessment for a 140-kilometer segment of the main-stem Klamath River below Iron Gate Dam, California

Cited by 3 publications

References 17 publications

Deconstructing dams and disease: predictions for salmon disease risk following Klamath River dam removals

Deconstructing dams and disease: predictions for salmon disease risk following Klamath River dam removals

Ceratonova shasta: a cnidarian parasite of annelids and salmonids

Reservoir evolution, downstream sediment transport, downstream channel change, and synthesis of geomorphic responses of Fall Creek and Middle Fork Willamette River to water years 2012–18 streambed drawdowns at Fall Creek Lake, Oregon

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