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DigitalCommons@USU
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Volcanism is a major agent of natural disturbance in the Pacific Northwest and other regions of the world. Volcanic eruptions alter surrounding landscapes and ecosystems and strongly influence the distribution and abundance of species. Although...
2005-01-01
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I examined whether variation in timing and length of the growth period for 11 species of Ephemerellidae was a function of either microhabitat stability or food availability. My data indicate that the growth patterns of these related species may be...
1990-01-01
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We examined spatial variation in daytime drift density of Baetis larvae collected from 42 habitat patches in Clearwater Creek, southwest Washington, USA. Drift density ranged between 22 and 525 100 m-3. Variation in drift density appeared to be...
1990-01-01
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[1] Robust predictions of stream solute concentrations expected under natural (reference) conditions would help establish more realistic water quality standards and improve stream ecological assessments. Models predicting solute concentrations...
2013-01-01
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Differences in the raw data used in bioassessments and choices regarding how those data are analyzed and summarized can affect inferences regarding the status of ecological resources and, thus, the degree to which we can trust individual...
2011-01-01
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RIVPACS models produce a community-level measure of biological condition known as O/E, which is derived from a comparison of the observed (O) biota with those expected (E) to occur in the absence of anthropogenic stress. We used benthic...
2007-01-01
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Water resources managers and conservation biologists need reliable, quantitative, and directly comparable methods for assessing the biological integrity of the world's aquatic ecosystems. Large-scale assessments are constrained by the lack of...
2006-01-01
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An important component of the biological assessment of stream condition is an evaluation of the direct or indirect effects of human activities or disturbances. The concept of a “reference condition” is increasingly used to describe the standard or...
2006-01-01
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The ratio of the number of observed taxa to that expected to occur in the absence of human-caused stress (OIE) is an intuitive and ecologically meaningful measure of biological integrity. We examined how OIE ratios derived from stream invertebrate...
2000-01-01
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Relative numerical dominance and densities of invertebrate functional feeding groups are compared with longitudinal and seasonal changes in food resources in a Cascade Range stream system in Oregon. We also compare our data with hypothetical...
1981-01-01
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Individual growth and densities of six taxa of ephemerellid mayflies were examined in relation to differences in temperature and food among streams of western North America. For most taxa, growth rate was not a simple function of either...
1986-01-01
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Although droughts and floods produce short‐term fluctuations in the elevation of Great Salt Lake, water diversions since the arrival of 19th Century pioneers represent a persistent reduction in water supply to the lake, decreasing its elevation by...
2016-02-24
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Documentation of the interacting effects of river regulation and climate on riparian vegetation has typically been limited to small segments of rivers or focused on individual plant species. We examine spatiotemporal variability in riparian...
2015-08-01
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Paleolimnological and plant physiological literature were reviewed to determine which types of aquatic plant macrofossils are suitable for radiocarbon dating, with a particular focus on the uptake of reservoir-aged dissolved inorganic carbon (DIC)...
2014-12-01
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Tributaries of the Colorado River Basin, historically home to a complex of endemic omnivores collectively referred to as the ‘three species’; flannelmouth sucker (Catostomus latipinnis), bluehead sucker (C. discobolus) and roundtail chub (Gila...
2013-01-01
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