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  • Water chemistry of Oregon Cascade wilderness lakes : a comparison to 1985 data

    Creator:
    Logan, Michael Burke
    Abstract:
    The Western Lake Survey (WLS) of 1985 documented the status of lake water chemistry across the western US and inferred population representations of various subregions and geomorphic units via statistically analyses. Results from this 1985 study indicated that lakes of the Oregon Cascades had the second most pristine and dilute...
    Resource Type:
    Masters Thesis
    Full Text:
    ............................................ 62 Figure 26: Precipitation Record for Cascade Summit (Lat. 43.59 N, Long. 122.06 W: 22 km

  • Elevation, thermal environment, and stream temperatures on headwater streams in northeastern Oregon

    Creator:
    Meays, Cynthia L.
    Abstract:
    A case study examining the relationship between stream temperatures and the thermal environment through which streams flow was conducted on the headwaters of 4 tributaries of the Burnt River (Barney, Elk, Greenhorn, and Stevens Creeks) in northeastern Oregon during July through August 1998 and 1999. Barney Creek and Stevens Creek...
    Resource Type:
    Masters Thesis
    Full Text:
    temperature for descending elevation, July and August 1998 and 1999 62 Mean time differences for first daily

  • Polar organic compounds as tracers of environmental processes

    Creator:
    Medeiros, Patricia Matheus de
    Abstract:
    Sources of polar/water-soluble organic compounds conjunctly with apolar biomarkers were characterized in natural organic matter. This multi-biomarker approach was accomplished by a simple analytical method consisting of extraction with dichloromethane:methanol (2:1, v/v), silylation and analysis by gaschromatography- mass spectrometry (GC-MS). Polar and apolar biomarkers, derived mainly from higher plants and...
    Resource Type:
    Dissertation
    Full Text:
    ................................................................................................................... 62 TABLE OF CONTENTS (Continued) Page 4.1. Introduction 63 4.2. Experimental Methods

  • Community analysis of the Wyoming big sagebrush alliance and functional role of Wyoming big sagebrush

    Creator:
    Davies, Kirk W.
    Abstract:
    This study consisted of two research projects in the Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis (Beetle & A. Young) S.L. Welsh) alliance, the most extensive of the big sagebrush complex in the Intermountain West. In the first project, we intensively sampled 107 relatively undisturbed, late seral Wyoming big sagebrush...
    Resource Type:
    Dissertation
    Full Text:
    communities occupy over 62 million hectares in the western United States (Küchler 1970, Miller et al. 1994

  • Using in situ turbidity to estimate sediment loads in forested headwater streams : a top-down versus bottom-up approach

    Creator:
    Meadows, Matthew W.
    Abstract:
    Suspended sediment and in situ turbidity data from two western Oregon streams, Oak Creek and South Fork Hinkle Creek, were used to estimate annual sediment loads for the 2006 water year (October 1, 2005 to September 30, 2006). Water samples and in situ turbidity observations were taken following the Turbidity...
    Resource Type:
    Masters Thesis
    Full Text:
    Developing SSC vs in situ Relationships....................................62 4.3.4 Oak Creek Annual

  • The influence of environmental and physical factors on the thermal patterns of headwater streams

    Creator:
    Carr, Craig A.
    Abstract:
    A case study was performed in 2000 and 2001 to characterize the thermal pattern of four morphologically similar eastern Oregon streams and to identify the physical and environmental factors that expressed significant and functionally viable relationships with stream temperature (daily maximum, daily minimum and daily rate of heating). Stream and...
    Resource Type:
    Masters Thesis
    Full Text:
    stream heating, daily minimum air temperature (mm air), and daily maximum air temperature (max air) 62