Alec Maule, Ph.D.
Alec is a Research Physiologist Emeritus for the USGS, Columbia River Research Laboratory.
Science and Products
Filter Total Items: 65
Migration depths of juvenile Chinook salmon and steelhead relative to total dissolved gas supersaturation in a Columbia River reservoir
The in situ depths of juvenile salmonids Oncorhynchus spp. were studied to determine whether hydrostatic compensation was sufficient to protect them from gas bubble disease (GBD) during exposure to total dissolved gas (TDG) supersaturation from a regional program of spill at dams meant to improve salmonid passage survival. Yearling Chinook salmon O. tshawytscha and juvenile steelhead O. mykiss imp
Authors
J.W. Beeman, A.G. Maule
Biological science in Oregon
Fishing is an important part of Oregon's culture. The Western Fisheries Research Center (WFRC) has been conducting research in Oregon for many years to provide information that can be used by managers to help keep fish and other parts of the ecosystem healthy. Below are examples of some of WFRC's studies.
Authors
Lyman Thorsteinson
Evidence of detrimental effects of environmental contaminants on growth and reproductive physiology of white sturgeon in impounded areas of the Columbia River
This study sought to determine whether wild white sturgeon from the Columbia River (Oregon) were exhibiting signs of reproductive endocrine disruption. Fish were sampled in the free-flowing portion of the river (where the population is experiencing reproductive success) and from three reservoirs behind hydroelectric dams (where fish have reduced reproductive success). All of the 18 pesticides and
Authors
G.W. Feist, M.A.H. Webb, D.T. Gundersen, E.P. Foster, C.B. Schreck, A.G. Maule, M.S. Fitzpatrick
Aroclor 1254 exposure reduces disease resistance and innate immune responses in fasted arctic charr
To examine the immunological impacts of polychlorinated biphenyls (PCBs) in an environmentally relevant way, we orally contaminated Arctic charr (Salvelinus alpinus) with Aroclor 1254. After contamination, fish were either fed (0 and 100 mg Aroclor 1254 kg-1 fish wt) or fasted (0, 1, 10, and 100 mg kg-1) to mimic cycles of feeding-fasting experienced by Arctic animals. After four months, PCB conce
Authors
A.G. Maule, E.H. Jorgensen, M.M. Vijayan, J.-E.A. Killie
Assessment of smolt condition: Biological and environmental interactions -- The impact of prey and predators on juvenile salmonids
The Bonneville Power Administration (BPA) has funded the Assessment of Smolt Condition project since 1987. During that time the project changed frequently to meet the information needs of fish managers by conducting studies throughout the Columbia River basin. Past research has examined the influence of smolt physiological development and health on migration rate; differences in development and mi
Authors
Sally T. Sauter, Robin M. Schrock, James H. Petersen, Alec G. Maule
PCB disruption of the hypothalamus-pituitary-interrenal axis involves brain glucocorticoid receptor downregulation in anadromous Arctic charr
We examined whether brain glucocorticoid receptor (GR) modulation by polychlorinated biphenyls (PCBs) was involved in the abnormal cortisol response to stress seen in anadromous Arctic charr (Salvelinus alpinus). Fish treated with Aroclor 1254 (0, 1, 10, and 100 mg/kg body mass) were maintained for 5 mo without feeding in the winter to mimic their seasonal fasting cycle, whereas a fed group with 0
Authors
N. Aluru, E.H. Jorgensen, A.G. Maule, M.M. Vijayan
Distribution and relative abundance of fishes in littoral areas of Chief Joseph Reservoir, Columbia River
We surveyed fish assemblages in littoral areas of Chief Joseph Reservoir of the upper Columbia River to aid in understanding this ecosystem. Fish distributions and abundances were examined during April-July 1999 in relation to environmental conditions in the reservoir. We also compared the fish assemblages in Chief Joseph reservoir in 1999 to a past study conducted during 1974-1975, and to assembl
Authors
Dena M. Gadomski, David A. Venditti, T. Craig Robinson, John W. Beeman, Alec G. Maule
Acute exposure to gas-supersaturated water does not affect reproductive success of female adult chinook salmon late in maturation
At times, total dissolved gas concentrations in the Columbia and Snake rivers have been elevated due to involuntary spill from high spring runoff and voluntary spill used as a method to pass juvenile salmonids over dams. The goal of this project was to determine if acute exposure to total dissolved gas supersaturation (TDGS) affects the reproductive performance of female chinook salmon late in the
Authors
William L. Gale, A.G. Maule, A. Postera, M.H. Peters
Gas bubble disease monitoring and research of juvenile salmonids. Annual report 2004
No abstract available
Authors
A.G. Maule
Xenobiotic impact on Arctic char: Nutritional modulation and physiological consequences
No abstract available
Authors
A.G. Maule
Gas bubble disease monitoring and research of juvenile salmonids, 1999
Abstract not available
Authors
J.W. Beeman, T.C. Robinson, P.V. Haner, S. P. VanderKooi, A.G. Maule
Gas bubble disease in resident fish below Grand Coulee Dam: final report of research
Fish kills have occurred in the reservoir below Grand Coulee Dam possibly due to total dissolved gas supersaturation (TDGS), which occurs when water cascades over a dam or waterfall. The highest TDGS below Grand Coulee Dam has occurred after spilling water via the outlet tubes, though TDGS from upstream sources has also been recorded. Exposure to TDGS can cause gas bubble disease in aquatic organi
Authors
J.W. Beeman, D.A. Venditti, R.G. Morris, D.M. Gadomski, B.J. Adams, S.J. Vanderkooi, T.C. Robinson, A.G. Maule
Science and Products
Filter Total Items: 65
Migration depths of juvenile Chinook salmon and steelhead relative to total dissolved gas supersaturation in a Columbia River reservoir
The in situ depths of juvenile salmonids Oncorhynchus spp. were studied to determine whether hydrostatic compensation was sufficient to protect them from gas bubble disease (GBD) during exposure to total dissolved gas (TDG) supersaturation from a regional program of spill at dams meant to improve salmonid passage survival. Yearling Chinook salmon O. tshawytscha and juvenile steelhead O. mykiss imp
Authors
J.W. Beeman, A.G. Maule
Biological science in Oregon
Fishing is an important part of Oregon's culture. The Western Fisheries Research Center (WFRC) has been conducting research in Oregon for many years to provide information that can be used by managers to help keep fish and other parts of the ecosystem healthy. Below are examples of some of WFRC's studies.
Authors
Lyman Thorsteinson
Evidence of detrimental effects of environmental contaminants on growth and reproductive physiology of white sturgeon in impounded areas of the Columbia River
This study sought to determine whether wild white sturgeon from the Columbia River (Oregon) were exhibiting signs of reproductive endocrine disruption. Fish were sampled in the free-flowing portion of the river (where the population is experiencing reproductive success) and from three reservoirs behind hydroelectric dams (where fish have reduced reproductive success). All of the 18 pesticides and
Authors
G.W. Feist, M.A.H. Webb, D.T. Gundersen, E.P. Foster, C.B. Schreck, A.G. Maule, M.S. Fitzpatrick
Aroclor 1254 exposure reduces disease resistance and innate immune responses in fasted arctic charr
To examine the immunological impacts of polychlorinated biphenyls (PCBs) in an environmentally relevant way, we orally contaminated Arctic charr (Salvelinus alpinus) with Aroclor 1254. After contamination, fish were either fed (0 and 100 mg Aroclor 1254 kg-1 fish wt) or fasted (0, 1, 10, and 100 mg kg-1) to mimic cycles of feeding-fasting experienced by Arctic animals. After four months, PCB conce
Authors
A.G. Maule, E.H. Jorgensen, M.M. Vijayan, J.-E.A. Killie
Assessment of smolt condition: Biological and environmental interactions -- The impact of prey and predators on juvenile salmonids
The Bonneville Power Administration (BPA) has funded the Assessment of Smolt Condition project since 1987. During that time the project changed frequently to meet the information needs of fish managers by conducting studies throughout the Columbia River basin. Past research has examined the influence of smolt physiological development and health on migration rate; differences in development and mi
Authors
Sally T. Sauter, Robin M. Schrock, James H. Petersen, Alec G. Maule
PCB disruption of the hypothalamus-pituitary-interrenal axis involves brain glucocorticoid receptor downregulation in anadromous Arctic charr
We examined whether brain glucocorticoid receptor (GR) modulation by polychlorinated biphenyls (PCBs) was involved in the abnormal cortisol response to stress seen in anadromous Arctic charr (Salvelinus alpinus). Fish treated with Aroclor 1254 (0, 1, 10, and 100 mg/kg body mass) were maintained for 5 mo without feeding in the winter to mimic their seasonal fasting cycle, whereas a fed group with 0
Authors
N. Aluru, E.H. Jorgensen, A.G. Maule, M.M. Vijayan
Distribution and relative abundance of fishes in littoral areas of Chief Joseph Reservoir, Columbia River
We surveyed fish assemblages in littoral areas of Chief Joseph Reservoir of the upper Columbia River to aid in understanding this ecosystem. Fish distributions and abundances were examined during April-July 1999 in relation to environmental conditions in the reservoir. We also compared the fish assemblages in Chief Joseph reservoir in 1999 to a past study conducted during 1974-1975, and to assembl
Authors
Dena M. Gadomski, David A. Venditti, T. Craig Robinson, John W. Beeman, Alec G. Maule
Acute exposure to gas-supersaturated water does not affect reproductive success of female adult chinook salmon late in maturation
At times, total dissolved gas concentrations in the Columbia and Snake rivers have been elevated due to involuntary spill from high spring runoff and voluntary spill used as a method to pass juvenile salmonids over dams. The goal of this project was to determine if acute exposure to total dissolved gas supersaturation (TDGS) affects the reproductive performance of female chinook salmon late in the
Authors
William L. Gale, A.G. Maule, A. Postera, M.H. Peters
Gas bubble disease monitoring and research of juvenile salmonids. Annual report 2004
No abstract available
Authors
A.G. Maule
Xenobiotic impact on Arctic char: Nutritional modulation and physiological consequences
No abstract available
Authors
A.G. Maule
Gas bubble disease monitoring and research of juvenile salmonids, 1999
Abstract not available
Authors
J.W. Beeman, T.C. Robinson, P.V. Haner, S. P. VanderKooi, A.G. Maule
Gas bubble disease in resident fish below Grand Coulee Dam: final report of research
Fish kills have occurred in the reservoir below Grand Coulee Dam possibly due to total dissolved gas supersaturation (TDGS), which occurs when water cascades over a dam or waterfall. The highest TDGS below Grand Coulee Dam has occurred after spilling water via the outlet tubes, though TDGS from upstream sources has also been recorded. Exposure to TDGS can cause gas bubble disease in aquatic organi
Authors
J.W. Beeman, D.A. Venditti, R.G. Morris, D.M. Gadomski, B.J. Adams, S.J. Vanderkooi, T.C. Robinson, A.G. Maule