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Fish are one of the most imperiled groups of vertebrates worldwide. Threats to fish fall into one of four general categories: physical habitat loss or degradation, chemical pollution, overfishing, and nonnative species introductions. Nonnative...
2009-05-01
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I used Moderate-Resolution Imaging Spectroradiometer (MODIS) imagery to answer two ecological questions. In the first project, I investigated the interactions between bark beetle-caused tree mortality and fire occurrence in western U.S. forests. I...
2010-05-01
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In lakes, fish and zooplankton can be both sources and sinks of nitrogen (N) and phosphorus (P) through the consumption of organic N and P, and subsequent excretion of bioavailable inorganic forms. These source/sink dynamics, known as...
2009-05-01
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A landscape perspective is critically important for understanding community structure, particularly in systems dominated by migratory fauna. I aimed to understand how the structure of riverscapes in Puerto Rico mediates potential anthropogenic...
2009-05-01
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Criteria used to characterize lotic salmonid habitat are often based on observed correlations between physical habitat characteristics and salmonid abundances. A focus on physical habitat features ignores other habitat components, such as an...
2009-05-01
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Limnologists and stream ecologists acknowledge the fundamental importance of temperature for regulating many ecological, biological, chemical, and physical processes. I investigated how water temperatures were affected by hydrologic linkages...
2010-12-01
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Investigations of limited and selected areas along the western shore of Bear Lake were carried out to determine the relative algal productivity with relation to nutrient concentrations and incident sunlight. The primary objective of the study was...
1972-05-01
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I studied nine streams near Grand Teton National Park, Wyoming, covering a land use gradient (urban, agricultural, and forested) to assess influences of land use on denitrification rates and hyporheic exchange. I hypothesized denitrification in...
2008-05-01
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Stream restoration activities in Reach 6 of Blackwood Creek involved constructing a new stream channel in a reach that had been eroding and adjusting to historic land uses since the 1960s. In 2010, the spring after restoration work was completed,...
2012-05-01
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Restoration of the upper Strawberry River included bank stabilization techniques because it was assumed that excessive bank erosion was degrading spawning habitat for Bonneville cutthroat trout (Oncorhynchus clarki Utah)(BCT). Using a long-term...
2011-05-01
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Short-term environmental education programs such as water festivals and field days are a common outreach tool for watershed programs, yet little is known about their effectiveness at increasing knowledge and environmental awareness. To address...
2012-05-01
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Freshwater mussels are the most threatened taxonomic group in North America with extinction rates that exceed those of many species found in both terrestrial and freshwater ecosystems including fish, birds, and amphibians. Part of the reason that...
2012-05-01
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I measured inflows and outflows of nutrients and suspended solid through the wetland complex, known as Dingle Marsh, at the Bear River Migratory Bird Refuge between October 2007 and September 2008. My analysis of changes throughout the year will...
2011-12-01
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Fine sediment, normally understood to refer to sand, silts, and clays; is a natural constituent in all rivers. When in excess this fine sediment can degrade the habitat for aquatic life in these rivers, and carry with it many pollutants and...
2012-05-01
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Terrestrial vegetation plays an important role in global carbon cycling and climate change by assimilating carbon into biomass during the growing season and releasing it due to natural or anthropogenic disturbances. Remote sensing and ecosystem...
2012-05-01
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Brown trout (Salmo trutta), one of the world’s most successful introduced species in river and lake systems, negatively impacts native species through predation, competition, and systemwide effects. Thus, there is a need to understand factors...
2012-05-01
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Determining if a stream has been degraded by human activities requires knowing what that stream’s natural water quality and freshwater species composition would likely be without any alteration. However stream natural conditions vary greatly from...
2012-05-01
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To protect and restore stream biota, managers need to be able to both detect biological degradation and infer likely causes of impairment. Managers commonly develop indices based on stream biota to assess the biological condition of streams....
2012-05-01
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Beaver, their dams and associated networks of dens, side-channels and pools have a profound influence on habitat heterogeneity and the complexity of the environments they occupy. The purpose of this paper is to illustrate the hydrologic and...
2012-12-01
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In the past many inland trout species were believed to be sedentary, only occupying small stream segments (20 meters) during their life span. Recently it has been found that cutthroat trout do move and many populations do contain both mobile and...
2012-05-01
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Recent declines in many species of aquatic organisms have raised concerns about loss of biodiversity in river systems and the need to protect populations in peril. To conserve endangered species, scientists need to know information about the...
2013-05-01
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Understanding and managing the effects of livestock grazing on stream systems is of particular concern on federal lands throughout the Interior Columbia River Basin. Land managers monitor three short-term indicators of livestock disturbance...
2013-05-01
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The water resources of the State of Utah are rapidly being developed for agriculture and industry. They are so extensively exploited that their continued and additional use must be justified on the basis of need and efficiency of utilization. To...
1963-05-01
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A major bioenvironmental effect of The United States Atomic Energy Commission's Underground Nuclear Testing Program on Amchitka Island, Alaska was the decimation of stream communities by drilling muds from the device emplacement holes. These muds...
1975-05-01
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Comprehensive population studies in the field of fisheries are in great demand. Many of our fishable waters are being changed, and we need to be able to predict the results of these habitat alterations. We must know how to include beneficial...
1963-05-01
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