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Full-Text Articles in Physical Sciences and Mathematics
Assessment Of Hazard Metrics For Predicting Field Benthic Invertebrate Toxicity In The Detroit River, Ontario, Canada, Kerry N. Mcphedren, Alice Grigicak-Mannnion, Gord Paterson, Briggs Tedd, Jan J.H. Ciborowski, G. Douglass Haffner, Ken G. Drouillard
Assessment Of Hazard Metrics For Predicting Field Benthic Invertebrate Toxicity In The Detroit River, Ontario, Canada, Kerry N. Mcphedren, Alice Grigicak-Mannnion, Gord Paterson, Briggs Tedd, Jan J.H. Ciborowski, G. Douglass Haffner, Ken G. Drouillard
Great Lakes Institute for Environmental Research Publications
Numerical sediment quality guidelines (SQGs) are frequently used to interpret site specific sediment chemistry and predict potential toxicity to benthic communities. These SQGs are useful for a screening line of evidence (LOE) that can be combined with other LOEs in a full weight of evidence (WOE) assessment of impacted sites. Three common multi-chemical hazard quotient methods (PEC-Qavg, PEC-Qmet and PEC-Qsum) and a novel (Hazard Score; HZD) approach were used in conjunction with a consensus based set of SQGs to evaluate the ability of different scoring metrics to predict the biological effects of sediment contamination under …
Is It Appropriate To Composite Fish Samples For Mercury Trend Monitoring And Consumption Advisories?, Ken G. Drouillard, Nilima Gandhi, Satyendra P. Bhavsar, Sarah B. Gewurtz, George B. Arhonditsis, Steve Petro
Is It Appropriate To Composite Fish Samples For Mercury Trend Monitoring And Consumption Advisories?, Ken G. Drouillard, Nilima Gandhi, Satyendra P. Bhavsar, Sarah B. Gewurtz, George B. Arhonditsis, Steve Petro
Great Lakes Institute for Environmental Research Publications
Monitoring mercury levels in fish can be costly because variation by space, time, and fish type/size needs to be captured. Here, we explored if compositing fish samples to decrease analytical costs would reduce the effectiveness of the monitoring objectives. Six compositing methods were evaluated by applying them to an existing extensive dataset and examining their performance in reproducing the fish consumption advisories and temporal trends. The methods resulted in varying amount (average 34-72%) of reductions in samples, but all (except one) reproduced advisories very well (96-97% of the advisories did not change or were one category more restrictive compared to …
Fullfact: An R Package For The Analysis Of Genetic And Maternal Variance Components From Full Factorial Mating Designs, Aimee Lee S. Houde, Trevor E. Pitcher
Fullfact: An R Package For The Analysis Of Genetic And Maternal Variance Components From Full Factorial Mating Designs, Aimee Lee S. Houde, Trevor E. Pitcher
Great Lakes Institute for Environmental Research Publications
Full factorial breeding designs are useful for quantifying the amount of additive genetic, nonadditive genetic, and maternal variance that explain phenotypic traits. Such variance estimates are important for examining evolutionary potential. Traditionally, full factorial mating designs have been analyzed using a two-way analysis of variance, which may produce negative variance values and is not suited for unbalanced designs. Mixed-effects models do not produce negative variance values and are suited for unbalanced designs. However, extracting the variance components, calculating significance values, and estimating confidence intervals and/or power values for the components are not straightforward using traditional analytic methods. We introduce fullfact …
Quantitative Biomonitoring In The Detroit River Using Elliptio Complanata: Verification Of Steady State Correction Factors And Temporal Trends Of Pcbs In Water Between 1998-2015, Ken G. Drouillard, Mark Cook, Todd A. Leadley, Paul Drca, Ted Briggs, G Douglas Haffner
Quantitative Biomonitoring In The Detroit River Using Elliptio Complanata: Verification Of Steady State Correction Factors And Temporal Trends Of Pcbs In Water Between 1998-2015, Ken G. Drouillard, Mark Cook, Todd A. Leadley, Paul Drca, Ted Briggs, G Douglas Haffner
Great Lakes Institute for Environmental Research Publications
Quantitative biomonitoring methods were applied to determine PCB concentrations in water from the Detroit River over a 17 year period. During 2014, mussels were deployed for and extended duration (21-364 d) and time dependent PCB concentrations were fit to a bioaccumulation model to estimate elimination coefficients (ktot) and provide site specific calibration of mussel toxicokinetics. The site specific calibration and different ktot versus KOW relationships from the literature were used to correct for steady state. ∑PCB concentrations in water were not significantly dependent on the ktot values used indicating that individual variation exceeds error contributed …
Determination Of Pcb Elimination Coefficients In Round Goby And Tubenose Goby, Xin Sun, Tim B. Johnson, Ken G. Drouillard
Determination Of Pcb Elimination Coefficients In Round Goby And Tubenose Goby, Xin Sun, Tim B. Johnson, Ken G. Drouillard
Great Lakes Institute for Environmental Research Publications
Whole-body elimination coefficients of polychlorinated biphenyls (PCBs) were determined in two Great Lakes invasive fish species, round goby (Neogobius melanostomus) and tubenose goby (Proterorhinus semilunaris). Elimination rates were determined for a set of model PCB congeners (n=12 congeners) dosed to fish by intraperitoneal injection and allowed to depurate at a temperature of 21.4oC for 90 d. Eight PCBs (PCB 6, 13, 21, 57, 62, 68, 89, 112 and 125) exhibited significant elimination by round goby and had corresponding half lives ranging from 13 to 39.8 d. For tubenose goby, four congeners (PCBs 21, 58, …