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  • Seasonal Movement of Coastal Cutthroat Trout (Oncorhynchus clarkii clarkii) in Headwater Streams in Oregon

    Creator:
    Linkem, Christina N.
    Abstract:
    Headwater streams in the Oregon Coastal Range are subject to drastic fluctuations in flow and temperature because of the changing seasonality of a Mediterranean climate. In response to these changes, stream fishes exhibit a variety of movement patterns. Coastal Cutthroat Trout (Oncorhynchus clarkii clarkii) have evolved an assortment of life...
    Resource Type:
    Masters Thesis
    Full Text:
    refuge sites (Lyon et al. 2010; Armstrong and Schindler 2013; Huntsman and Falke 2019). Though these

  • Spatial and Temporal Dynamics of Eulachon (Thaleichthys pacificus) in Northern Southeast Alaska

    Creator:
    Pochardt, Meredith R.
    Abstract:
    In Southeast Alaska, Eulachon (Thaleichthys pacificus) are a culturally and biologically important anadromous fish. Eulachon populations have significantly declined in the southern part of their range, and in 2010 eulachon in northern California, Oregon, and Washington were listed as a threatened species under the Endangered Species Act. In the same...
    Resource Type:
    Masters Thesis
    Full Text:
    friends for their support throughout this endeavor and my committee: Taal Levi, Johnny Armstrong, and

  • Diving into Diversity: Fish Populations and Climate Resilience in an Endorheic Basin

    Creator:
    Dew, Aleah
    Abstract:
    The Goose Lake Basin, situated on the border of Oregon and California, USA, faces significant challenges from drought, wildfire, and other environmental stressors. This region hosts numerous endemic fish species such as the Goose Lake redband trout (Oncorhynchus mykiss newberri), Goose Lake lamprey (Entosphenus sp.), Goose Lake tui chub (Siphateles...
    Resource Type:
    Masters Thesis
    Full Text:
    committee members Dr. Taal Levi, Dr. Jonny Armstrong, and Alex Harrison for their valuable feedback on my

  • The physiological response of larval Pacific lamprey to chronic heat stress

    Creator:
    Carilli, Patrick B.
    Abstract:
    Pacific lamprey is an important cultural and ecological species to freshwater ecosystems of the Pacific Northwest. Lamprey often rear in low gradient portions of watersheds that have high exposure to climate warming, yet very little is known about their thermal physiology in comparison with other anadromous fishes such as Pacific...
    Resource Type:
    Masters Thesis
    Full Text:
    pleased to acknowledge the support of my mentors Jerri Bartholomew, Scott Heppell, Jonathan Armstrong

  • Spatiotemporal Distribution of Ceratonova shasta and its Genotypes in the Deschutes River Basin

    Creator:
    Hubbard, Kalyn M.
    Abstract:
    The waterborne, myxozoan parasite Ceratonova shasta is endemic to the Pacific Northwest and can be lethal to its secondary salmonid host, including the culturally, economically, and recreationally important spring Chinook salmon (Oncorhynchus tshawytscha) of the Deschutes River, OR. Previously described genotypes of C. shasta exhibit specificity with their salmonid hosts....
    Resource Type:
    Masters Thesis
    Full Text:
    appreciation to my committee members Sascha Hallett, Jerri Bartholomew, Jonathan Armstrong, and Jovana

  • Aquatic food web responses to patchy shading along forested headwater streams

    Creator:
    Heaston, Emily
    Abstract:
    In small forested streams, changes in age and structure of riparian vegetation covering the stream have been shown to directly influence the amount of light reaching the stream benthos. Light has the potential to impact in-stream resources that support secondary production through constraints on primary productivity. The influence of landscape...
    Resource Type:
    Masters Thesis
    Full Text:
    (Forest Ecosystems & Society), Lisa Ganio (Forest Ecosystems & Society), Jonathan Armstrong (Fisheries

  • Modifications to Rearing Environments as a Method for Reducing Domestication Selection in Hatchery-reared Steelhead (Oncorhynchus mykiss)

    Creator:
    Obley, Miriam
    Abstract:
    Since the decline of salmonid populations in the Pacific Northwest, supplementation programs have become frequently implemented by hatcheries as a way to protect and conserve wild stock. However, hatchery-reared fish have lower fitness than wild fish which is likely due to adaptation to the hatchery environment, i.e., domestication selection. Fish...
    Resource Type:
    Masters Thesis
    Full Text:
    sincere appreciation to my graduate committee; Jonathan Armstrong, Tiffany Garcia, and David Lytle, all

  • The Influence of Prey Predictability on the Foraging Behavior and Movement of Intertidal Predators

    Creator:
    Hennessey, Shannon M.
    Abstract:
    Fluctuations and spatial heterogeneity of habitat and resources is thought to underlie niche variation in animal populations, with intraspecific differences serving to produce or maintain population-, community-, or ecosystem-level patterns. Individual diet variation, defined as individual variation in food resource use within a population that is consistent over time, is...
    Resource Type:
    Dissertation
    Full Text:
    my committee members Bruce Menge, Dave Lytle, Jonny Armstrong, and Ivan Arismendi. I greatly

  • Bottom-up Drivers of Primary Producers and Predator Populations in Oregon Streams

    Creator:
    Kaylor, Matthew J.
    Abstract:
    Humans have drastically altered the physical habitat and food web structure of stream ecosystems. Two major impacts humans have had on Pacific Northwest streams are modification of streamside forests (as a result of agriculture, land development, and timber harvest), and declines in the return of wild anadromous salmon to headwater...
    Resource Type:
    Dissertation
    Full Text:
    , Seth White, Johnny Armstrong, and Brian Haley. They were always there when I needed advice on project