| pesticide and pcb residues in the upper snake river ecosystem, southeastern idaho, following the collapse of the teton dam 1976. | the teton dam in southeastern idaho collapsed on june 5, 1976. the resulting flood damaged a large area and caused the release of toxicants into the snake river. a pesticide recovery team in a helicopter worked the flooded area for three weeks and collected 1,104 containers, about 35% of which contained toxicants. it was estimated that less than 60% of the lost pesticide containers were recovered. this paper addresses the results of a one-time sampling effort designed to determine the magnitude ... | 1979 | 120135 |
| lesions of tuberculosis in mountain whitefish (prosopium williamsoni). | lesions of tuberculosis in mountain whitefish (prosopium williamsoni) were present in all visceral organs. the tubercles were composed of large rounded macrophages which contained numerous intracytoplasmic acid-fast bacilli. the lesions were not encapsulated and mineralization was not observed. | 1978 | 650789 |
| mycobacteriosis in mountain whitefish (prosopium williamsoni) from the yakima river, washington. | mycobacteriosis was found in mountain whitefish (prosopium williamsoni) taken from the yakima river near richland, washington in 1975 and 1976. the disease appeared to affect about 8% of the population sampled. gross lesions were present in most visceral organs, but were most common in the kidney, liver and pyloric caeca. microscopically, the lesions consisted of large numbers of macrophages containing numerous intracellular bacilli. an organism was isolated and has been tentatively classified a ... | 1978 | 691127 |
| cumulative industrial activity alters lotic fish assemblages in two boreal forest watersheds of alberta, canada. | we evaluated the cumulative effects of land use disturbance resulting from forest harvesting, and exploration and extraction of oil and gas resources on the occurrence and structure of stream fish assemblages in the kakwa and simonette watersheds in alberta, canada. logistic regression models showed that the occurrence of numerically dominant species in both watersheds was related to two metrics defining industrial activity (i.e., percent disturbance and road density), in addition to stream wett ... | 2008 | 18815827 |
| acute toxicity of zinc to several aquatic species native to the rocky mountains. | national water-quality criteria for the protection of aquatic life are based on toxicity tests, often using organisms that are easy to culture in the laboratory. species native to the rocky mountains are poorly represented in data sets used to derive national water-quality criteria. to provide additional data on the toxicity of zinc, several laboratory acute-toxicity tests were conducted with a diverse assortment of fish, benthic invertebrates, and an amphibian native to the rocky mountains. tes ... | 2012 | 21811884 |
| environmental monitoring of bleached kraft pulp mill chlorophenolic compounds in a northern canadian river system. | the environmental transport of pulp mill effluent compounds and the exposure of two fish species has been monitored by parallel analyses of effluent, water column and suspended sediment samples, and fish bile and muscle. compounds analyzed included over 20 chlorophenolic compounds and 12 fatty and resin acids. the concentration of chlorophenols varied with seasonal river flows and mill process changes such as the substitution of chlorine dioxide (clo2) for chlorine gas (cl2) in the bleach plant. ... | 1994 | 8044637 |
| a new microsporidium sp. (microsporidia) from the musculature of the mountain whitefish prosopium williamsoni from british columbia: morphology and phylogeny. | few microsporidia have been reported from whitefish species (subfamily coregoninae). for the most part, these microsporidia have been incompletely described. in a survey of parasites of mountain whitefish prosopium williamsoni collected from kootenay lake, british columbia, we encountered an unusual microsporidium infecting the endomysium of the skeletal musculature. spores were uninucleate, ovoid to pyriform, and were 5.6 (5-7) microm x 3.2 (3-4) microm with 13-16 coils in the polar filament. w ... | 1999 | 10647045 |