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: 50
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 preferentially
Authors
Caroline M. Elliott, Robert B. Jacobson, Aaron J. DeLonay
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 between behavi
Authors
S.K. Brewer, E. E. Little, A. J. DeLonay, S.L. Beauvais, S.B. Jones, Mark R. Ellersieck
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 chamber. Rainbo
Authors
James A. Hansen, Daniel F. Woodward, Edward E. Little, Aaron J. DeLonay, Harold L. Bergman
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 behavior, r
Authors
S.K. Brewer, A. J. DeLonay, S.L. Beauvais, E. E. Little, S.B. Jones
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 spectroradiometer. A ser
Authors
R.D. Hurtubise, Edward E. Little, J.E. Havel
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, qualitative evalu
Authors
E. E. Little, A. J. DeLonay
Behavioral avoidance as evidence of injury to fishery resources: Applications to natural resource damage assessment
Natural Resource Damage Assessment (NRDA) provisions enacted under Comprehensive Environmental Response Compensation and Liability Act (CERCLA) and the Oil Pollution Act (OPA) empower natural resource trustees to seek compensation for environmental injury resulting from the release of oil or hazardous substances. Under NRDA regulations promulgated under CERCLA, fish avoidance behavior is recognize
Authors
Aaron J. Delonay, Edward E. Little, J. Lipton, D. F. Woodward, J.A. Hansen
Behavioral studies of contaminant effects on aquatic invertebrates: A review of Russian investigations
Studies by Russian scientists have documented significant alterations and impairment of critical behavioral functions in aquatic organisms following exposure to environmental contaminants. Behavioral responses disrupted by sublethal exposure to toxicants are intimately involved in habitat selection, foraging, competition, predator-prey relationships, and reproduction, and are essential to surviv
Authors
V. A. Nepomnyashchikh, V. A. DeLonay, E. E. Little
Use of behavioral avoidance testing in natural resource damage assessment
Natural Resource Damage Assessment (NRDA) provisions established under federal and state statutes enable natural resource trustees to recover compensation from responsible parties to restore injured natural resources. Behavioral avoidance testing with fish has been used in NRDAs to determine injuries to natural resources and to establish restoration thresholds. In this manuscript we evaluate the u
Authors
J. Lipton, E. E. Little, J.C.A. Marr, A. J. DeLonay
Pathological and behavioral manifestations of the “Cayuga syndrome,” a thiamine deficiency in larval landlocked Atlantic salmon
The “Cayuga syndrome” is a maternally transmitted, naturally occurring thiamine deficiency that causes 100% mortality of larval landlocked Atlantic salmon Salmo salar in several of New York's Finger Lakes, Results of multiyear studies to qualify and quantify the neurobehavioral and gross pathological signs of this condition are described, Affected sac fry became weak and ataxic and responded atypi
Authors
Jeffrey P. Fisher, Jan M. Spitsbergen, Tina Iamonte, Edward E. Little, Aaron DeLonay
Brown trout avoidance of metals in water characteristic of the Clark Fork River, Montana
The avoidance response of brown trout (Salmo trutta) to mixtures of cadmium, copper, lead, and zinc was determined in water simulating the Clark Fork River, Montana. Effects of acidification on the avoidance response were also evaluated. Tests were conducted in a cylindrical chamber that received reference water at one end and metal-contaminated water at the other; a distinct boundary formed at th
Authors
Daniel F. Woodward, James A. Hansen, Harold L. Bergman, Aaron J. Delonay, Edward E. Little
Metals-contaminated benthic invertebrates in the Clark Fork River, Montana: Effects on age-0 brown trout and rainbow trout
Benthic organisms in the upper Clark Fork River have recently been implicated as a dietary source of metals that may be a chronic problem for young-of-the-year rainbow trout (Oncorhynchus mykiss). In this present study, early life stage brown trout (Salmo trutta) and rainbow trout were exposed for 88 d to simulated Clark Fork River water and a diet of benthic invertebrates collected from the river
Authors
Daniel F. Woodward, Aïda M. Farag, Harold L. Bergman, Aaron J. Delonay, Edward E. Little, Charlie E. Smiths, Frederic T. Barrows
Science and Products
Filter Total Items: 42
No results found.
Filter Total Items: 50
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 preferentially
Authors
Caroline M. Elliott, Robert B. Jacobson, Aaron J. DeLonay
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 between behavi
Authors
S.K. Brewer, E. E. Little, A. J. DeLonay, S.L. Beauvais, S.B. Jones, Mark R. Ellersieck
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 chamber. Rainbo
Authors
James A. Hansen, Daniel F. Woodward, Edward E. Little, Aaron J. DeLonay, Harold L. Bergman
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 behavior, r
Authors
S.K. Brewer, A. J. DeLonay, S.L. Beauvais, E. E. Little, S.B. Jones
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 spectroradiometer. A ser
Authors
R.D. Hurtubise, Edward E. Little, J.E. Havel
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, qualitative evalu
Authors
E. E. Little, A. J. DeLonay
Behavioral avoidance as evidence of injury to fishery resources: Applications to natural resource damage assessment
Natural Resource Damage Assessment (NRDA) provisions enacted under Comprehensive Environmental Response Compensation and Liability Act (CERCLA) and the Oil Pollution Act (OPA) empower natural resource trustees to seek compensation for environmental injury resulting from the release of oil or hazardous substances. Under NRDA regulations promulgated under CERCLA, fish avoidance behavior is recognize
Authors
Aaron J. Delonay, Edward E. Little, J. Lipton, D. F. Woodward, J.A. Hansen
Behavioral studies of contaminant effects on aquatic invertebrates: A review of Russian investigations
Studies by Russian scientists have documented significant alterations and impairment of critical behavioral functions in aquatic organisms following exposure to environmental contaminants. Behavioral responses disrupted by sublethal exposure to toxicants are intimately involved in habitat selection, foraging, competition, predator-prey relationships, and reproduction, and are essential to surviv
Authors
V. A. Nepomnyashchikh, V. A. DeLonay, E. E. Little
Use of behavioral avoidance testing in natural resource damage assessment
Natural Resource Damage Assessment (NRDA) provisions established under federal and state statutes enable natural resource trustees to recover compensation from responsible parties to restore injured natural resources. Behavioral avoidance testing with fish has been used in NRDAs to determine injuries to natural resources and to establish restoration thresholds. In this manuscript we evaluate the u
Authors
J. Lipton, E. E. Little, J.C.A. Marr, A. J. DeLonay
Pathological and behavioral manifestations of the “Cayuga syndrome,” a thiamine deficiency in larval landlocked Atlantic salmon
The “Cayuga syndrome” is a maternally transmitted, naturally occurring thiamine deficiency that causes 100% mortality of larval landlocked Atlantic salmon Salmo salar in several of New York's Finger Lakes, Results of multiyear studies to qualify and quantify the neurobehavioral and gross pathological signs of this condition are described, Affected sac fry became weak and ataxic and responded atypi
Authors
Jeffrey P. Fisher, Jan M. Spitsbergen, Tina Iamonte, Edward E. Little, Aaron DeLonay
Brown trout avoidance of metals in water characteristic of the Clark Fork River, Montana
The avoidance response of brown trout (Salmo trutta) to mixtures of cadmium, copper, lead, and zinc was determined in water simulating the Clark Fork River, Montana. Effects of acidification on the avoidance response were also evaluated. Tests were conducted in a cylindrical chamber that received reference water at one end and metal-contaminated water at the other; a distinct boundary formed at th
Authors
Daniel F. Woodward, James A. Hansen, Harold L. Bergman, Aaron J. Delonay, Edward E. Little
Metals-contaminated benthic invertebrates in the Clark Fork River, Montana: Effects on age-0 brown trout and rainbow trout
Benthic organisms in the upper Clark Fork River have recently been implicated as a dietary source of metals that may be a chronic problem for young-of-the-year rainbow trout (Oncorhynchus mykiss). In this present study, early life stage brown trout (Salmo trutta) and rainbow trout were exposed for 88 d to simulated Clark Fork River water and a diet of benthic invertebrates collected from the river
Authors
Daniel F. Woodward, Aïda M. Farag, Harold L. Bergman, Aaron J. Delonay, Edward E. Little, Charlie E. Smiths, Frederic T. Barrows