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Full-Text Articles in Physical Sciences and Mathematics
Illuminating Whole Effluent Toxicity Testing: Ultraviolet Radiation, Phototoxicity, And Pah-Contaminated Groundwater, Jason C. Fortner
Illuminating Whole Effluent Toxicity Testing: Ultraviolet Radiation, Phototoxicity, And Pah-Contaminated Groundwater, Jason C. Fortner
WWU Graduate School Collection
In this study, the acute toxicity of polycyclic aromatic hydrocarbon (PAH) - contaminated groundwater to Daphnia magna and Pimephales promelas were characterized under both ambient laboratory lighting and ambient laboratory lighting supplemented with ultraviolet radiation (UVR) using USEPA Whole Effluent Toxicity (WET) test methods. Research has shown the toxicity of some PAHs to aquatic organisms increases significantly in the presence of sunlight or artificial UVR, a phenomenon known as photoactivated toxicity or phototoxicity. Based on these findings, the discharge of PAH-contaminated groundwater to surface waters may be a phototoxic hazard to aquatic organisms. Since WET tests are frequently employed to …
A Comparison Of Benthic Macroinvertebrate Assemblages Among Kryal And Rhithral Lake Outlets In The North Cascade Mountains, Kelley L. Turner
A Comparison Of Benthic Macroinvertebrate Assemblages Among Kryal And Rhithral Lake Outlets In The North Cascade Mountains, Kelley L. Turner
WWU Graduate School Collection
This study compares the physico-chemical conditions and composition of benthic macroinvertebrates from five rhithral (snowmelt-fed) and five kryal (glacially-fed) lake outlet streams in the North Cascade Mountains, WA. Non-metric, non-parametric cluster and association analysis (NMCAA) clearly separated outlet streams of kryal and rhithral origin based on physico-chemical and taxon variables. Kryal lake outlets were characterized by lower water temperatures, unstable in-stream channels and higher turbidity, discharge and fine substrates than rhithral sites. A total of 24,985 specimens representing 93 macroinvertebrate taxa were collected. Rhithral lake outlets had significantly higher densities and supported more taxa than kryal sites (9,049 ind./m2 and …
Effects Of Salmon-Derived Nutrients On An Artificial Stream System, Danielle M. Love
Effects Of Salmon-Derived Nutrients On An Artificial Stream System, Danielle M. Love
WWU Graduate School Collection
An artificial stream system was constructed to study responses of autotrophic and heterotrophic stream communities to salmon-derived nutrients. The artificial stream system contained 12 raceways (1.2 m long x 20 cm wide x 13 cm tall) that were provided with a constant flow of well water. The experimental treatment group consisted of clay pots filled with pureed salmon carcasses and agar to simulate decomposing salmon carcasses; a control group was included consisting of pots containing agar without salmon tissue. Unglazed clay tiles were placed downstream from the clay pots for periphyton to colonize. Periphyton samples were collected from these tiles. …