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276 - 300 of 657 Items << < 7 8 9 10 11 12 13 14 15 16 > >>
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1. The distribution of species is affected by many factors operating at a variety of temporal and spatial scales in a heterogeneous landscape. In lakes, fish communities are dynamic, influenced by landscape-level factors that control colonisation...
2006-01-01
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Bonneville cisco Prosopium gemmifer are endemic to and found only in Bear Lake, Utah–Idaho. As part of an investigation into life history characteristics of this species of special conservation concern, we examined survival of Bonneville cisco...
1997-01-01
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Two commonly used simulation models were combined to assess the effects of stocking and harvest regulations on the consumption dynamics of walleyes Stizostedion vitreum in Lake Mendota, Wisconsin. An age-structured population model was used to...
1991-01-01
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Laboratory experiments demonstrated an ontogenetic shift in feeding habits of juvenile cutthroat trout Salmo clarki. Fish smaller than 6.0 cm in standard length preferred planktonic prey Daphnia pulex to each of three benthic prey (species of...
1986-01-01
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The probability that bluegills (sunfish) (Lepomis macrochirus) will locate prey varies with distance and position of the prey in three-dimensional space. Location ability is greatest in the hemisphere directly ahead of the fish. The probability...
1981-01-01
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Excessive suspended sediment in rivers is often the combined result of complex interactions between climate, hydrology, geomorphology, and human land use. Developing a process-based understanding of these interactions represents a formidable...
2010-01-01
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We use the 10Be concentration in alluvial sand and gravel to document hillslope exposure history and trace the reduction in grain size of river alluvium in the Clearwater River basin, western Washington State. Clearwater tributary basins Wilson...
2007-01-01
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Over the past 100 years, riparian vegetation communities throughout the Southwest United States have been extensively invaded by Tamarix spp. (saltcedar). Saltcedar derives its common name from its physiological adaptation to excrete salts. The...
1998-05-01
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Studies done by the Nevada Department of Wildlife (NDOW) and the Arizona Fish and Game between 1978 and 1981 indicate that inadequate cover may be limiting the production and survival of largemouth bass at the Lake Mead National Recreation Area...
1989-12-01
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Analysis and development of carbonate-bicarbonate chemical subroutine.
1982-06-28
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The Great Salt Lake is bordered to the south and east by a growing metropolitan area that contributes high nutrients to Farmington Bay. This large bay is eutrophic, and there is concern that continued increases in effluents from the Salt Lake City...
2004-01-01
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The diurnal vertical movement of zooplankton was first recorded in freshwater lakes by Weismann (1877) in Lake Constance (Bodensee), although Cuvier was credited with observing the migration of Daphniae in 1817 (Gushing, 1955). The migration is...
1974-01-01
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Zooplankton samples collected from throughout Lake Mead, in 1981-1982, demonstrate the presence of a statistically significant seasonal and spatial heterogeneity in zooplankton densities. Seasonally, the major zooplankton groups were most abundant...
1984-05-01
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The response to periodic desiccation of periphyton communities developed in eddy environments or in areas exposed to variable, direct current was examined. Algal communities were incubated on clay tiles for between 2 and 12 weeks in the Colorado...
1984-12-01
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Watershed scale models simulating hydrological and water quality processes have advanced rapidly in sophistication, process representation, flexibility in model structure, and input data. With calibration being an inevitable step prior to any...
2018-05-31
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