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Filtering by: Creator Richards, Judith D. Remove constraint Creator: Richards, Judith D. Academic Affiliation Fisheries and Wildlife Remove constraint Academic Affiliation: Fisheries and Wildlife

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  • Invertebrate composition and distribution in desert springs of Oregon

    Creator:
    Mauger, Susan
    Abstract:
    In the summers of 1998 and 1999, aquatic invertebrate and plant communities were sampled from nineteen springs in the Warner Basin of southeastern Oregon. Across the landscape, these springs exhibited a broad range in water temperature (5-24°C), pH, conductivity, elevation, and gradient. Within a particular spring, water temperature and chemistry...
    Resource Type:
    Masters Thesis
    Full Text:
    Of Oregon. Abstract approved Judith L. Li In the summers of 1998 and 1999, aquatic invertebrate

  • Ecology of populations of Van Dyke's salamanders in the Cascade Range of Washington State

    Creator:
    McIntyre, Aimee P.
    Abstract:
    The Van Dyke's salamander (Plethodon vandyke,) is a rare species endemic to Washington State. It has been found in cool moist microhabitats along streams, splash zones of waterfalls, and headwater seeps. We explored the association of the Van Dyke's salamander with hydrologic condition, geomorphology, disturbance characteristics, and vegetation structure in...
    Resource Type:
    Masters Thesis
    Full Text:
    ioiulations of Van Dyke's salamanders in the Cascade Range of Washington State Abstract approved: Richard

  • From continua to patches : longitudinal patterns in the Middle Fork of the John Day River, Oregon

    Creator:
    Wright, Kristopher Keith
    Abstract:
    The Middle Fork John Day River is composed of low gradient, alluvial valley segments separated by constrained, canyon-like reaches, and has a history of multiple land-uses. These factors can alter the physical and biological structure of streams, and disrupt the longitudinal river continuum. I examined habitat, fish, macroinvertebrates, and primary...
    Resource Type:
    Dissertation
    Full Text:
    : Judith Lew Li The Middle Fork John Day River is composed of low gradient, alluvial valley segments

  • The effects of irrigation water withdrawals on macroinvertebrate community structure and life history strategies

    Creator:
    Miller, Scott W.
    Abstract:
    I used current water management practices in central and eastern Oregon and Washington as natural experiments to quantify the effects of irrigation water withdrawals on macroinvertebrate community structure and life history strategies. Reduced discharge had direct (e.g. decreased velocity and wetted habitat) and indirect (e.g. increased conductivity and temperature) effects...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________________________ David Wooster Judith L. Li I used current water management practices in central

  • Fish and invertebrate distribution at multiple scales in Thomas Creek, Oregon : a transition from conifer uplands to agricultural lowlands

    Creator:
    Langshaw, Russell B.
    Abstract:
    Longitudinal patterns of fish and benthic invertebrate distribution and habitat use were similar in Thomas Creek, Oregon but clarity of these patterns differed. I studied fish and aquatic invertebrates simultaneously, at multiple scales, and used multivariate statistical techniques to compare responses to the same environmental conditions. Both types of organisms...
    Resource Type:
    Masters Thesis
    Full Text:
    Lowlands. Abstract appr Judith L. Li Longitudinal patterns of fish and benthic invertebrate distribution

  • A multi-trophic level examination of recreational impacts on a national wild and scenic river

    Creator:
    Wright, Kristopher Keith
    Abstract:
    Initially, components of an aquatic food web were examined to study impacts of recreational use on the aquatic ecology of Quartzville Creek, Oregon in 1995 and 1996. Measurements of the food web components consisted of observations of harlequin ducks (Histrionicus histrionicus), visual counts of the larval caddisfly Dicosmoecus gilvipes, benthic...
    Resource Type:
    Masters Thesis
    Full Text:
    Examination of Recreational Impacts on a National Wild and Scenic River. Abstract approved: Judith Lew

  • Lotic macroinvertebrate distribution patterns in northeastern Oregon

    Creator:
    Gerth, William J.
    Abstract:
    This study was an investigation of lotic macroinvertebrate distribution in northeastern Oregon at two different spatial and biological scales. Examination of assemblages at a limited spatial scale revealed relationships with natural and disturbance gradients and led to questions about distribution of a population at broader spatial scales. In a 16...
    Resource Type:
    Masters Thesis
    Full Text:
    specimens from the Middle Fork John Day River. and Dr. Judith Li provided data and L. pluviale specimens

  • Salmon and marine-derived nutrient effects on primary and secondary trophic levels

    Creator:
    Claeson, Shannon M.
    Abstract:
    The purpose of this study was to understand the influence of organic material and nutrients from spawning salmon and supplemented salmon carcasses on stream food webs. My study objectives were to examine 1) assimilation of salmon-derived nutrients (SDN) by producers and consumers in the food web, 2) epilithic biofilm productivity,...
    Resource Type:
    Masters Thesis
    Full Text:
    , backrubs, smiles and generosity. CONTRIBUTION OF AUTHORS Dr. Judith Li contributed to the study design

  • Seasonal dynamics of a riparian food web in the Oregon Coast Range mountains

    Creator:
    Robillard, Amanda Lynn
    Abstract:
    Riparian areas are eco-tones where aquatically- and terrestrially-derived insect biomass is exchanged between habitats, presenting consumers with new sources of energy, and resulting in a reciprocal subsidy. The relative contribution of energy exchange and the resulting impacts on vertebrate riparian consumers, such as fish or birds, remains poorly understood. We...
    Resource Type:
    Masters Thesis
    Full Text:
    Judith L. Li Riparian areas are eco-tones where aquatically- and terrestrially-derived insect biomass

  • Over-wintering diet, growth, and prey available to juvenile coho salmon (Oncorhynchus kisutch) in the West Fork Smith River, Oregon

    Creator:
    Olegario, Anthony
    Abstract:
    Over-winter growth of juvenile salmonids may be linked to ocean survival and thus species persistence. Diet, growth, and prey available to juvenile coho, Oncorhynchus kisutch, were examined from December 2004 to April 2005 in four tributaries of the West Fork Smith River (WFSR), Oregon. Juvenile coho growth rate and condition...
    Resource Type:
    Masters Thesis
    Full Text:
    : __________________________________________ Judith L. Li Over-winter growth of juvenile salmonids may be linked to ocean survival