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  • 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:
    : ______________________________________________________ Dana Warren In small forested streams, changes in age and structure of riparian vegetation

  • Experiments and Observations on How Changes in Riparian Forests Affect Light and Stream Ecosystems

    Creator:
    Swartz, Allison G.
    Abstract:
    Riparian zones are ecotones between terrestrial and aquatic ecosystems. Processes in streams are strongly influenced by riparian forest communities, age, stage and structure. Temperate forests across much of North America, including riparian areas, are recovering from historic land clearing with many stands in the stem-exclusion phase of development in which...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________________ Dana R. Warren Riparian zones are ecotones between

  • A Review and Recommendations for Assessing Floodplain Vegetation Recovery Following Stage 0 and Beaver Dam Analog Restorations in the Pacific Northwest

    Creator:
    Colley, Lara K. M.
    Abstract:
    Floodplains are a significant and increasingly threatened ecosystem. As restoration projects are implemented more frequently in degraded floodplains, novel methods are emerging with a focus on restoring critical processes in which vegetation plays a key role. The purpose of this paper is two-fold: 1) to develop expectations for vegetation response,...
    Resource Type:
    Capstone Project
    Full Text:
    would like to thank my faculty advisor, Dana Warren for his support and guidance over the last few

  • Stream Temperature and Autotrophic Responses to Riparian Canopy Gaps Over Forested Headwater Streams

    Creator:
    Swartz, Allison
    Abstract:
    Across much of North America, legacies of historic and contemporary timber harvest have created a landscape dominated by regenerating forest stands in the early to middle stages of development. Most streamside forests are currently in the stem-exclusion phase of stand development and these closed canopies shade the forest understory and...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Dana R. Warren Across much of North America, legacies of historic and contemporary

  • 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:
    . CONTRIBUTION OF AUTHORS Dana R. Warren contributed to all aspects of this dissertation and associated

  • Truth to Nature: The Art and Ecology of Hudson River School Painting

    Creator:
    Loeb, Harper
    Abstract:
    Beginning with the inception of American art history as a formal discipline in the 1940s, the dominant mode of interpreting nineteenth-century American landscape painting has been to view aspects of the landscape as symbols for grand cultural, religious, national, and moral narratives. While this method of interpretation highlights some key...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: Dana R. Warren Peter Betjemann Beginning with the inception of

  • The Interaction of Fire Refugia and Climate Refugia: A Case Study within California’s Diablo Mountain Range

    Creator:
    Turk, Douglas E.
    Abstract:
    As climate change contributes to larger and more severe wildfires in California, areas of fire refugia – considered unburned and low-severity burn patches – are playing an increasingly important role in sustaining ecosystem resilience, maintaining biodiversity, and supporting post-disturbance recovery. At the same time, climate refugia – which are areas...
    Resource Type:
    Masters Thesis
    Full Text:
    Krawchuk Abstract approved: ______________________________________________________ Dana Warren

  • A Novel Approach to Process-based River Restoration in Oregon : Practitioners’ Perspectives, and Effects on In-stream Wood

    Creator:
    Bianco, Stephanie R.
    Abstract:
    The widespread fragmentation, channelization, and simplification of river ecosystems has had acute environmental impacts, including degradation of water quality and habitat and biodiversity loss (Vörösmarty et al., 2010). These concerns have incited an increased focus on reestablishing ecological and hydrogeomorphological functions and improving habitat that has been lost in riverine...
    Resource Type:
    Masters Thesis
    Full Text:
    the details. Dana Warren and Catalina Segura, my valued and brilliant committee members, also played

  • The Influence of Lithology on Stream Metabolism in Mountain Systems

    Creator:
    Cargill, Samantha K.
    Abstract:
    Physical disturbance in streams has important effects on the metabolic rates of gross primary production (GPP) and ecosystem respiration (ER). Underlying lithology can control sediment size, amount, and evolution in the stream, influencing substrate stability and its effect on benthic organisms. We assessed the patterns of disturbance and recovery of...
    Resource Type:
    Masters Thesis
    Full Text:
    sandstone basin. Recovery of GPP was more rapid in the sandstone basin than the basalt basin. The P/R

  • Effects of Stage 0 Stream Restoration on Aquatic Macroinvertebrate Production

    Creator:
    Jennings, Jeremy C.
    Abstract:
    Contemporary stream restoration efforts increasingly prioritize restoring natural stream processes to regain lost ecosystem functions. Stage 0 stream restoration resets disturbed, channelized streams to a theoretical pre-disturbance state (“stage zero”). It is assumed that this valley-scale restoration/disturbance will restore natural abiotic and biotic processes, leading to greater primary and secondary...
    Resource Type:
    Masters Thesis
    Full Text:
    Jonathan Armstrong, Dana Warren, and James Ryan Bellmore for their mentorship, support, enthusiasm, and