Aaron DeLonay
Aaron is an Ecologist at the Columbia Environmental Research Center.
Science and Products
Filter Total Items: 42
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Filter Total Items: 56
Hydroecological modeling of the Lower Missouri River Hydroecological modeling of the Lower Missouri River
No abstract avaikable
Authors
H.E. Johnson, R. B. Jacobson, A. J. DeLonay
Gender identification of shovelnose sturgeon using ultrasonic and endoscopic imagery and the application of the method to the pallid sturgeon Gender identification of shovelnose sturgeon using ultrasonic and endoscopic imagery and the application of the method to the pallid sturgeon
Monthly sampling of shovelnose sturgeon Scaphirhynchus platorynchus, a biological surrogate for the endangered pallid sturgeon Scaphirhynchus albus, was conducted to develop a multiseasonal profile of reproductive stages. Data collected included histological characteristics of gonads from wild caught fish and laboratory and field ultrasonic and endoscopic images. These data were used to...
Authors
M. L. Wildhaber, D. M. Papoulias, A. J. DeLonay, D. Tillitt, J.L. Bryan, M.L. Annis, J.A. Allert
Age estimation for shovelnose sturgeon: A cautionary note based on annulus formation in pectoral fin rays Age estimation for shovelnose sturgeon: A cautionary note based on annulus formation in pectoral fin rays
Numerous studies have examined the age and growth of shovelnose sturgeon Scaphirhynchus platorynchus, but only one study attempted to validate age estimation techniques. Therefore, our objective was to use marginal increment analysis to validate annulus formation in pectoral fin rays of shovelnose sturgeon collected from the Missouri River. We also compared the precision of age estimates...
Authors
K.W. Whiteman, V.H. Travnichek, M. L. Wildhaber, A. DeLonay, D. Papoulias, D. Tillett
Physical aquatic habitat assessment, Fort Randall segment of the Missouri River, Nebraska and South Dakota Physical aquatic habitat assessment, Fort Randall segment of the Missouri River, Nebraska and South Dakota
This study addressed habitat availability and use by endangered pallid sturgeon (Scaphirhynchus albus) in the Fort Randall segment of the Missouri River. Physical aquatic habitat - depth, velocity, and substrate - was mapped in 15 sites in Augsust and October of 2002. Habitat assessments were compared with fish locations using radio telemetry. Results indicate that pallid sturgeon...
Authors
Caroline Elliott, Robert Jacobson, Aaron DeLonay
Behavioral dysfunctions correlate to altered physiology in rainbow trout (Oncorynchus mykiss) exposed to cholinesterase-inhibiting chemicals Behavioral dysfunctions correlate to altered physiology in rainbow trout (Oncorynchus mykiss) exposed to cholinesterase-inhibiting chemicals
We selected four metrics of swimming behavior (distance swam, speed, rate of turning, and tortuosity of path) and the commonly used biochemical marker, brain cholinesterase (ChE) activity, to assess (1) the sensitivity and reliability of behavior as a potential biomarker in monitoring work, (2) the potential for these endpoints to be used in automated monitoring, and (3) the linkage...
Authors
S.K. Brewer, E. Little, A. J. DeLonay, S.L. Beauvais, S.B. Jones, Mark Ellersieck
Fishes of Missouri River, chute, and flood plain habitats: Chapter 4 in Initial biotic survey of Lisbon Bottom, Big Muddy National Fish and Wildlife Refuge Fishes of Missouri River, chute, and flood plain habitats: Chapter 4 in Initial biotic survey of Lisbon Bottom, Big Muddy National Fish and Wildlife Refuge
The Lisbon Bottom Unit of the Big Muddy National Fish and Wildlife Refuge (Refuge) is approximately 2,200 acres and is the first complete unit of the Refuge. Primary objectives of the Refuge are to create and restore diverse riverine aquatic habitats and reconnect the Missouri River to its flood plain where feasible. Management seeks to accomplish these objectives by encouraging natural...
Authors
Joanne Grady, Jim Milligan, Duane Chapman, Ellen Ehrhardt, Douglas Dieterman, David Galat, John Hooker, John Kubisiak, Aaron DeLonay, Edward Little, Jack Robinson, John Tibbs
Use of automated monitoring to assess behavioral toxicology in fish: Linking behavior and physiology Use of automated monitoring to assess behavioral toxicology in fish: Linking behavior and physiology
We measured locomotory behaviors (distance traveled, speed, tortuosity of path, and rate of change in direction) with computer-assisted analysis in 30 day posthatch rainbow trout (Oncorhynchus mykiss) exposed to pesticides. We also examined cholinesterase inhibition as a potential endpoint linking physiology and behavior. Sublethal exposure to chemicals often causes changes in swimming...
Authors
S.K. Brewer, A. J. DeLonay, S.L. Beauvais, E. Little, S.B. Jones
Behavioral avoidance: Possible mechanism for explaining abundanc and distribution of trout species in a metal-impacted river Behavioral avoidance: Possible mechanism for explaining abundanc and distribution of trout species in a metal-impacted river
Behavioral avoidance of metal mixtures by rainbow trout (Oncorhynchus mykiss) was determined in the laboratory under water quality conditions that simulated the upper Clark Fork River, Montana, USA. A metal mixture with a fixed ratio of observed ambient metal concentrations (12 μg/L Cu:1.1 μg/L Cd:3.2 μg/L Pb:50 μg/L Zn) was used to determine avoidance in a countercurrent avoidance...
Authors
James Hansen, Daniel Woodward, Edward Little, Aaron DeLonay, Harold Bergman
Environmental toxicology and risk assessment: Seventh volume Environmental toxicology and risk assessment: Seventh volume
This publication, Environmental Toxicology and Risk Assessment: Seventh Volume, contains papers presented at the Seventh Symposium on Toxicology and Risk Assessment: Ultraviolet Radiation and the Environment, held 7-9 April, 1997 in St. Louis, MO. The symposium, the 24th in a series on environmental toxicology, was sponsored by Committee E-47. Edward E. Little, of the U.S. Geological...
Methods for assessing the impacts of ultraviolet-B radiation on aquatic invertebrates Methods for assessing the impacts of ultraviolet-B radiation on aquatic invertebrates
A standard methodology for assessing the impacts of simulated solar ultraviolet-B radiation (UV-B) on aquatic invertebrates was established. A solar simulator was used to expose a variety of aquatic invertebrates to different levels of UV-B. The simulator was calibrated as close as possible to match local ambient solar radiation measured in and out of water with a scanning...
Authors
R.D. Hurtubise, Edward Little, J.E. Havel
Occurrence and distribution of semivolatile organic compounds in stream bed sediments, United States, 1992-95 Occurrence and distribution of semivolatile organic compounds in stream bed sediments, United States, 1992-95
Bed-sediment samples from streams were collected from 443 sites in 19 major river basins during 1992-95 and analyzed for semivolatile organic compounds (SVOCs) to assess the occurrence and distribution of selected Hydrophobic contaminants. Forty SVOCs were detected in more than 5 percent of samples. Of these 40 SVOCs, 27 were polycyclic aromatic hydrocarbons (PAHs), 5 were azaarenes, 5...
Authors
Thomas Lopes, Edward Furlong, Jeffrey Pritt
Measures of fish behavior as indicators of sublethal toxicosis during standard toxicity tests Measures of fish behavior as indicators of sublethal toxicosis during standard toxicity tests
Behavioral functions essential for growth and survival can be dramatically altered by sublethal exposure to toxicants. Measures of these behavioral responses are effective in detecting adverse effects of sublethal contaminant exposure. Behavioral responses of fishes can be qualitatively and quantitatively evaluated during routine toxicity tests. At selected intervals of exposure...
Authors
E. Little, A. J. DeLonay
Science and Products
Filter Total Items: 42
No results found.
Filter Total Items: 56
Hydroecological modeling of the Lower Missouri River Hydroecological modeling of the Lower Missouri River
No abstract avaikable
Authors
H.E. Johnson, R. B. Jacobson, A. J. DeLonay
Gender identification of shovelnose sturgeon using ultrasonic and endoscopic imagery and the application of the method to the pallid sturgeon Gender identification of shovelnose sturgeon using ultrasonic and endoscopic imagery and the application of the method to the pallid sturgeon
Monthly sampling of shovelnose sturgeon Scaphirhynchus platorynchus, a biological surrogate for the endangered pallid sturgeon Scaphirhynchus albus, was conducted to develop a multiseasonal profile of reproductive stages. Data collected included histological characteristics of gonads from wild caught fish and laboratory and field ultrasonic and endoscopic images. These data were used to...
Authors
M. L. Wildhaber, D. M. Papoulias, A. J. DeLonay, D. Tillitt, J.L. Bryan, M.L. Annis, J.A. Allert
Age estimation for shovelnose sturgeon: A cautionary note based on annulus formation in pectoral fin rays Age estimation for shovelnose sturgeon: A cautionary note based on annulus formation in pectoral fin rays
Numerous studies have examined the age and growth of shovelnose sturgeon Scaphirhynchus platorynchus, but only one study attempted to validate age estimation techniques. Therefore, our objective was to use marginal increment analysis to validate annulus formation in pectoral fin rays of shovelnose sturgeon collected from the Missouri River. We also compared the precision of age estimates...
Authors
K.W. Whiteman, V.H. Travnichek, M. L. Wildhaber, A. DeLonay, D. Papoulias, D. Tillett
Physical aquatic habitat assessment, Fort Randall segment of the Missouri River, Nebraska and South Dakota Physical aquatic habitat assessment, Fort Randall segment of the Missouri River, Nebraska and South Dakota
This study addressed habitat availability and use by endangered pallid sturgeon (Scaphirhynchus albus) in the Fort Randall segment of the Missouri River. Physical aquatic habitat - depth, velocity, and substrate - was mapped in 15 sites in Augsust and October of 2002. Habitat assessments were compared with fish locations using radio telemetry. Results indicate that pallid sturgeon...
Authors
Caroline Elliott, Robert Jacobson, Aaron DeLonay
Behavioral dysfunctions correlate to altered physiology in rainbow trout (Oncorynchus mykiss) exposed to cholinesterase-inhibiting chemicals Behavioral dysfunctions correlate to altered physiology in rainbow trout (Oncorynchus mykiss) exposed to cholinesterase-inhibiting chemicals
We selected four metrics of swimming behavior (distance swam, speed, rate of turning, and tortuosity of path) and the commonly used biochemical marker, brain cholinesterase (ChE) activity, to assess (1) the sensitivity and reliability of behavior as a potential biomarker in monitoring work, (2) the potential for these endpoints to be used in automated monitoring, and (3) the linkage...
Authors
S.K. Brewer, E. Little, A. J. DeLonay, S.L. Beauvais, S.B. Jones, Mark Ellersieck
Fishes of Missouri River, chute, and flood plain habitats: Chapter 4 in Initial biotic survey of Lisbon Bottom, Big Muddy National Fish and Wildlife Refuge Fishes of Missouri River, chute, and flood plain habitats: Chapter 4 in Initial biotic survey of Lisbon Bottom, Big Muddy National Fish and Wildlife Refuge
The Lisbon Bottom Unit of the Big Muddy National Fish and Wildlife Refuge (Refuge) is approximately 2,200 acres and is the first complete unit of the Refuge. Primary objectives of the Refuge are to create and restore diverse riverine aquatic habitats and reconnect the Missouri River to its flood plain where feasible. Management seeks to accomplish these objectives by encouraging natural...
Authors
Joanne Grady, Jim Milligan, Duane Chapman, Ellen Ehrhardt, Douglas Dieterman, David Galat, John Hooker, John Kubisiak, Aaron DeLonay, Edward Little, Jack Robinson, John Tibbs
Use of automated monitoring to assess behavioral toxicology in fish: Linking behavior and physiology Use of automated monitoring to assess behavioral toxicology in fish: Linking behavior and physiology
We measured locomotory behaviors (distance traveled, speed, tortuosity of path, and rate of change in direction) with computer-assisted analysis in 30 day posthatch rainbow trout (Oncorhynchus mykiss) exposed to pesticides. We also examined cholinesterase inhibition as a potential endpoint linking physiology and behavior. Sublethal exposure to chemicals often causes changes in swimming...
Authors
S.K. Brewer, A. J. DeLonay, S.L. Beauvais, E. Little, S.B. Jones
Behavioral avoidance: Possible mechanism for explaining abundanc and distribution of trout species in a metal-impacted river Behavioral avoidance: Possible mechanism for explaining abundanc and distribution of trout species in a metal-impacted river
Behavioral avoidance of metal mixtures by rainbow trout (Oncorhynchus mykiss) was determined in the laboratory under water quality conditions that simulated the upper Clark Fork River, Montana, USA. A metal mixture with a fixed ratio of observed ambient metal concentrations (12 μg/L Cu:1.1 μg/L Cd:3.2 μg/L Pb:50 μg/L Zn) was used to determine avoidance in a countercurrent avoidance...
Authors
James Hansen, Daniel Woodward, Edward Little, Aaron DeLonay, Harold Bergman
Environmental toxicology and risk assessment: Seventh volume Environmental toxicology and risk assessment: Seventh volume
This publication, Environmental Toxicology and Risk Assessment: Seventh Volume, contains papers presented at the Seventh Symposium on Toxicology and Risk Assessment: Ultraviolet Radiation and the Environment, held 7-9 April, 1997 in St. Louis, MO. The symposium, the 24th in a series on environmental toxicology, was sponsored by Committee E-47. Edward E. Little, of the U.S. Geological...
Methods for assessing the impacts of ultraviolet-B radiation on aquatic invertebrates Methods for assessing the impacts of ultraviolet-B radiation on aquatic invertebrates
A standard methodology for assessing the impacts of simulated solar ultraviolet-B radiation (UV-B) on aquatic invertebrates was established. A solar simulator was used to expose a variety of aquatic invertebrates to different levels of UV-B. The simulator was calibrated as close as possible to match local ambient solar radiation measured in and out of water with a scanning...
Authors
R.D. Hurtubise, Edward Little, J.E. Havel
Occurrence and distribution of semivolatile organic compounds in stream bed sediments, United States, 1992-95 Occurrence and distribution of semivolatile organic compounds in stream bed sediments, United States, 1992-95
Bed-sediment samples from streams were collected from 443 sites in 19 major river basins during 1992-95 and analyzed for semivolatile organic compounds (SVOCs) to assess the occurrence and distribution of selected Hydrophobic contaminants. Forty SVOCs were detected in more than 5 percent of samples. Of these 40 SVOCs, 27 were polycyclic aromatic hydrocarbons (PAHs), 5 were azaarenes, 5...
Authors
Thomas Lopes, Edward Furlong, Jeffrey Pritt
Measures of fish behavior as indicators of sublethal toxicosis during standard toxicity tests Measures of fish behavior as indicators of sublethal toxicosis during standard toxicity tests
Behavioral functions essential for growth and survival can be dramatically altered by sublethal exposure to toxicants. Measures of these behavioral responses are effective in detecting adverse effects of sublethal contaminant exposure. Behavioral responses of fishes can be qualitatively and quantitatively evaluated during routine toxicity tests. At selected intervals of exposure...
Authors
E. Little, A. J. DeLonay