Index Catalog // ScholarsArchive@OSU

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Creator:: Sobota, Daniel J.
Abstract:: Land use alters the physical and biological structure of stream ecosystems and potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in abundance on the biosphere during the past century from human activities. In this dissertation, I quantified uptake and transformation of nitrate (NO₃⁻)...
Resource Type:: Dissertation
Full Text:: Stanley V. Gregory Land use alters the physical and biological structure of stream ecosystems and

Comparisons of fish assemblages and habitat associations in littoral zones of reservoirs in the Willamette Basin, Oregon

Creator:: Bennett, Paul Michael
Abstract:: The littoral zones of seven reservoirs in the southern Willamette Valley of Oregon were sampled with a boat electroshocker during the summer months of 1995 and 1996. Shoreline substrates were inventoried before sampling sites were randomly selected. Sampling sites consisted of 9 of 12 possible habitat types including four substrate...
Resource Type:: Masters Thesis
Full Text:: . Abstract Approved: Wayne K. Seim Stanley V. Gregory The littoral zones of seven reservoirs in the

Microhabitat associations and behavioral dynamics of co-occurring native Pacifastacus leniusculus and invasive Procambarus clarkii crayfish in Oregon's southern Willamette Valley

Creator:: Hanshew, Brett Alan
Abstract:: Biological invasions are the second largest threat to biodiversity following habitat loss, and studying invasions has been a focus of ecological the past two decades. Despite the intense research, many basic questions remain empirically unanswered, particularly in the realm of behavior. The purpose of this research was to explore the...
Resource Type:: Masters Thesis
Full Text:: field assistance from M. O’Neil. I would also like to thank Drs. S. Gregory, D. Wooster, and L.M

Riparian vegetation composition and structure associated with channel morphology of headwater meadow streams in the Blue Mountains, northeast Oregon

Creator:: Toledo, Zachary O.
Abstract:: Relationships between the structure and composition of riparian vegetation with channel morphology were examined in three montane meadow streams in the headwaters of the Upper Grande Ronde River and North Fork John Day River in the Blue Mountains, northeast Oregon. Vegetation composition, root biomass, and channel morphology cross-sections were sampled...
Resource Type:: Masters Thesis
Full Text:: Stan Gregory brought focus and insights to the research. Bob Carson and Mike Bonoff provided

Factors influencing population density of stream-living Redband Trout in southeast Oregon, USA

Creator:: Thorson, Justin M.
Abstract:: Fisheries managers often use models of population density to evaluate the status of stream-living fishes, but many of these models have low predictive performance for abundance and density. These models could incorporate several factors that can limit population density, particularly the effect of body size, envisioned by the theory of...
Resource Type:: Masters Thesis
Full Text:: , McMillan et al. 2012, Grossman and Simon 2020), and these processes drive abundance. Although the

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

Streamside forests, channel constraint, large woody debris characteristics, and pool morphology in low order streams, Blue Mountains, Oregon

Creator:: Cordova, Jerry J.
Resource Type:: Masters Thesis
Full Text:: . 1987; Gregory et al. 1991). Salmonid fishes, in particular, have evolved in stream systems in which

A comparison of nest site selection and reproductive effort by reticulate sculpin (Cottus perplexus) in two streams of different geologies in the central Coast Range of Oregon

Creator:: Bateman, Douglas S.
Abstract:: Nest sites of reticulate sculpin (Cottus perplexus) were located in two stream reaches, one from a basalt basin and one from a sandstone basin. Stream reaches were similar in gradient, basin area, elevation, climate, and riparian vegetation but differed in biologic community structure and substrate characteristics. An electivity index was...
Resource Type:: Masters Thesis
Full Text:: ; Simon and Brown 1943; Bailey 1952; Bond 1963; Millikan 1968). A quantitative study enumerating habitat

Linking Moral Obligations, Assumption-based Research, and Structured Decision Making to Inform Bull Trout Recovery

Creator:: Brignon, William R.
Abstract:: More than 1500 species of plants and animals in the United States are listed as threatened or endangered under the Endangered Species Act (ESA). The U.S. Departments of Interior and Commerce are required, under Section 4(f)(1) of the ESA, to develop recovery plans for ESA-listed species under the respective agency...
Resource Type:: Dissertation
Full Text:: west coast salmonids (Gregory and Long 2009). Reintroduction and captive breeding decisions

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

ScholarsArchive@OSU

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Comparisons of fish assemblages and habitat associations in littoral zones of reservoirs in the Willamette Basin, Oregon

Microhabitat associations and behavioral dynamics of co-occurring native Pacifastacus leniusculus and invasive Procambarus clarkii crayfish in Oregon's southern Willamette Valley

Riparian vegetation composition and structure associated with channel morphology of headwater meadow streams in the Blue Mountains, northeast Oregon

Factors influencing population density of stream-living Redband Trout in southeast Oregon, USA

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

Streamside forests, channel constraint, large woody debris characteristics, and pool morphology in low order streams, Blue Mountains, Oregon

A comparison of nest site selection and reproductive effort by reticulate sculpin (Cottus perplexus) in two streams of different geologies in the central Coast Range of Oregon

Linking Moral Obligations, Assumption-based Research, and Structured Decision Making to Inform Bull Trout Recovery

Effects of Stage 0 Stream Restoration on Aquatic Macroinvertebrate Production

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