Bruce A Manny (Former Employee)
Science and Products
Filter Total Items: 63
Burrowing mayfly nymphs in western Lake Erie, 1942-1944
These data, collected during 1942-1944 by Dr. David C. Chandler, describe the density, biomass, and growth of a now extinct population of burrowing mayfly nymphs (primarily Hexagenia limbata) that lived in the sediments of western Lake Erie near South Bass Island. The growth dynamics of this population have not previously been documented. Female nymphs grew faster than males and were about 4 mm lo
Authors
Bruce A. Manny
Compsopogon cf. coeruleus, a benthic red alga (Rhodophyta) new to the Laurentian Great Lakes
We found Compsopogon cf. coeruleus for the first time in the Laurentian Great Lakes, growing on limestone rocks at a depth of 21 m on Six Fathom Bank in central Lake Huron. It is the first freshwater red alga to be found in the Great Lakes and the only red alga ever found on an offshore reef in the Great Lakes. However, because this alga usually inhabits water 10–28 °C and has not survived freezin
Authors
Bruce A. Manny, Thomas A. Edsall, Daniel E. Wujek
Chemical contamination and physical characteristics of sediments in the upper Great Lakes connecting channels 1985
Contamination of sediments by toxic organic substances and heavy metals was widespread throughout the connecting channels of the upper Great Lakes in 1985. Sediments at 250 stations in the connecting channels were analyzed for total PCBs, oil and grease, phenols, total cyanide, total volatile solids, mercury, cadmium, chromium, cobalt, copper, lead, nickel, and zinc, and the results were evaluate
Authors
Paul E. Bertram, Thomas A. Edsall, Bruce A. Manny, Susan J. Nichols, Donald W. Schloesser
Distribution of Hexagenia nymphs and visible oil in sediments of the Upper Great Lakes connecting channels
As part of the study of the Upper Great Lakes Connecting Channels sponsored by the U.S. Environmental Protection Agency, the U.S. Fish and Wildlife Service examined the occurrence ofHexagenia nymphs and visible oil in sediments at 250 stations throughout the St. Marys River and the St. Clair-Detroit River system from May 14 to June 11, 1985. The mean density of Hexagenianymphs per square meter ave
Authors
Donald W. Schloesser, Thomas A. Edsall, Bruce A. Manny, Susan J. Nichols
Decline of wildcelery buds in the lower Detroit River, 1950-85
American wildcelery buds (Vallisneria americana), an abundant food eaten by diving ducks (Aythini) during migrations, decreased in the lower Detroit River of the Great Lakes from 1950 to 1985. Bud densities decreased at 2 (-14 and -18 buds/mA?) of 5 locations and were similar at 3 (-2, +2, and +3 buds/mA?) of 5 locations. Net change in all 5 areas combined, however, was a decrease of 36,720,000 bu
Authors
Donald W. Schloesser, Bruce A. Manny
Hydrological, morphometrical, and biological characteristics of the connecting rivers of the International Great Lakes: a review
The connecting channels of the Great Lakes are large rivers (1, 200-9, 900 m3 • s-1) with limited tributary drainage systems and relatively stable hydrology (about 2:1 ration of maximum to minimum flow). The rivers, from headwaters to outlet, are the St. Marys, St. Clair, Detroit, Niagara, and St. Lawrence. They share several characteristics with certain other large rivers: the fish stocks that hi
Authors
Clayton J. Edwards, Patrick L. Hudson, Walter G. Duffy, Stephen J. Nepszy, Clarence D. McNabb, Robert C. Haas, Charles R. Liston, Bruce Manny, Wolf-Dieter N. Busch
Assessment of lake trout spawning habitat quality in central Lake Huron by submarine
Interstitial water quality was measured using a submersible at seven locations on Six Fathom Bank. Historically, the bank was an important lake trout spawning ground. It is currently the focus of coordinated, interagency efforts to rehabilitate lake trout in Lake Huron. Water quality, evaluated from measurements of biochemical oxygen demand, dissolved oxygen, ammonia, and hydrogen sulfide among
Authors
Bruce A. Manny, Thomas A. Edsall
Potential effects of shipping on submersed macrophytes in the St. Clair and Detroit Rivers of the Great Lakes
An extensive survey of submersed macrophytes in the St. Clair and Detroit rivers revealed statistically significant differences in the composition and density of macrophyte beds in shipping channels (used by commercial vessels passing between Lakes Huron and Erie) and non-shipping channels. Of nine common macrophyte taxa, four (Characae, Potamogeton richardsonii, Potamogeton spp. narrow-leaf form
Authors
Donald W. Schloesser, Bruce A. Manny
Field test of a bioassay procedure for assessing habitat quality on fish spawning grounds
A bioassay procedure to assess habitat quality was tested on Port Austin reef in southern Lake Huron, a spawning area of lake trout Salvelinus namaycush. In 1986, Plexiglas incubators filled with fertilized lake trout eggs were buried by scuba divers in rock rubble at two sites. The incubators then were attached to chains between large trap-net anchors on the bottom and left over winter. At one si
Authors
Bruce A. Manny, David J. Jude, Randy L. Eshenroder
Management of fish populations in large rivers: a review of tools and approaches
In common with most branches of science, the management of riverine fish populations is characterised by reductionist and isolationist philosophies. Traditional fish management focuses on stocking and controls on fishing. This paper presents a consensus of scientists involved in the LARS workshop on the management of fish populations in large rivers. A move towards a more holistic philosophy is ad
Authors
Geoffrey E. Petts, Jack G. Imhoff, Bruce A. Manny, John F. B. Maher, Stephen B. Weisberg
Development of a benthic invertebrate objective for mesotrophic Great Lakes waters
A biological indicator of mesotrophic conditions should (1) provide an appropriate and interpretable objective; (2) be achievable if corrective measures are taken (i.e., it should be within the expected environmental range of the system); and (3) allow measurement of progress toward the objective. Historical data from the Great Lakes suggest that population density of the burrowing mayfly, Hexagen
Authors
Trefor B. Reynoldson, Donald W. Schloesser, Bruce A. Manny
Use of aerial photography to inventory aquatic vegetation
This study demonstrates the feasibility of using low-altitude aerial photography to inventory submersed macrophytes in the connecting channels of the Great Lakes. For this purpose, we obtained aerial color transparencies and collateral ground truth information about submersed vegetation at 160 stations within four study sites in the St. Clair and Detroit rivers, September 17 to October 4, 1984. Ph
Authors
Donald W. Schloesser, Charles L. Brown, Bruce A. Manny
Science and Products
Filter Total Items: 63
Burrowing mayfly nymphs in western Lake Erie, 1942-1944
These data, collected during 1942-1944 by Dr. David C. Chandler, describe the density, biomass, and growth of a now extinct population of burrowing mayfly nymphs (primarily Hexagenia limbata) that lived in the sediments of western Lake Erie near South Bass Island. The growth dynamics of this population have not previously been documented. Female nymphs grew faster than males and were about 4 mm lo
Authors
Bruce A. Manny
Compsopogon cf. coeruleus, a benthic red alga (Rhodophyta) new to the Laurentian Great Lakes
We found Compsopogon cf. coeruleus for the first time in the Laurentian Great Lakes, growing on limestone rocks at a depth of 21 m on Six Fathom Bank in central Lake Huron. It is the first freshwater red alga to be found in the Great Lakes and the only red alga ever found on an offshore reef in the Great Lakes. However, because this alga usually inhabits water 10–28 °C and has not survived freezin
Authors
Bruce A. Manny, Thomas A. Edsall, Daniel E. Wujek
Chemical contamination and physical characteristics of sediments in the upper Great Lakes connecting channels 1985
Contamination of sediments by toxic organic substances and heavy metals was widespread throughout the connecting channels of the upper Great Lakes in 1985. Sediments at 250 stations in the connecting channels were analyzed for total PCBs, oil and grease, phenols, total cyanide, total volatile solids, mercury, cadmium, chromium, cobalt, copper, lead, nickel, and zinc, and the results were evaluate
Authors
Paul E. Bertram, Thomas A. Edsall, Bruce A. Manny, Susan J. Nichols, Donald W. Schloesser
Distribution of Hexagenia nymphs and visible oil in sediments of the Upper Great Lakes connecting channels
As part of the study of the Upper Great Lakes Connecting Channels sponsored by the U.S. Environmental Protection Agency, the U.S. Fish and Wildlife Service examined the occurrence ofHexagenia nymphs and visible oil in sediments at 250 stations throughout the St. Marys River and the St. Clair-Detroit River system from May 14 to June 11, 1985. The mean density of Hexagenianymphs per square meter ave
Authors
Donald W. Schloesser, Thomas A. Edsall, Bruce A. Manny, Susan J. Nichols
Decline of wildcelery buds in the lower Detroit River, 1950-85
American wildcelery buds (Vallisneria americana), an abundant food eaten by diving ducks (Aythini) during migrations, decreased in the lower Detroit River of the Great Lakes from 1950 to 1985. Bud densities decreased at 2 (-14 and -18 buds/mA?) of 5 locations and were similar at 3 (-2, +2, and +3 buds/mA?) of 5 locations. Net change in all 5 areas combined, however, was a decrease of 36,720,000 bu
Authors
Donald W. Schloesser, Bruce A. Manny
Hydrological, morphometrical, and biological characteristics of the connecting rivers of the International Great Lakes: a review
The connecting channels of the Great Lakes are large rivers (1, 200-9, 900 m3 • s-1) with limited tributary drainage systems and relatively stable hydrology (about 2:1 ration of maximum to minimum flow). The rivers, from headwaters to outlet, are the St. Marys, St. Clair, Detroit, Niagara, and St. Lawrence. They share several characteristics with certain other large rivers: the fish stocks that hi
Authors
Clayton J. Edwards, Patrick L. Hudson, Walter G. Duffy, Stephen J. Nepszy, Clarence D. McNabb, Robert C. Haas, Charles R. Liston, Bruce Manny, Wolf-Dieter N. Busch
Assessment of lake trout spawning habitat quality in central Lake Huron by submarine
Interstitial water quality was measured using a submersible at seven locations on Six Fathom Bank. Historically, the bank was an important lake trout spawning ground. It is currently the focus of coordinated, interagency efforts to rehabilitate lake trout in Lake Huron. Water quality, evaluated from measurements of biochemical oxygen demand, dissolved oxygen, ammonia, and hydrogen sulfide among
Authors
Bruce A. Manny, Thomas A. Edsall
Potential effects of shipping on submersed macrophytes in the St. Clair and Detroit Rivers of the Great Lakes
An extensive survey of submersed macrophytes in the St. Clair and Detroit rivers revealed statistically significant differences in the composition and density of macrophyte beds in shipping channels (used by commercial vessels passing between Lakes Huron and Erie) and non-shipping channels. Of nine common macrophyte taxa, four (Characae, Potamogeton richardsonii, Potamogeton spp. narrow-leaf form
Authors
Donald W. Schloesser, Bruce A. Manny
Field test of a bioassay procedure for assessing habitat quality on fish spawning grounds
A bioassay procedure to assess habitat quality was tested on Port Austin reef in southern Lake Huron, a spawning area of lake trout Salvelinus namaycush. In 1986, Plexiglas incubators filled with fertilized lake trout eggs were buried by scuba divers in rock rubble at two sites. The incubators then were attached to chains between large trap-net anchors on the bottom and left over winter. At one si
Authors
Bruce A. Manny, David J. Jude, Randy L. Eshenroder
Management of fish populations in large rivers: a review of tools and approaches
In common with most branches of science, the management of riverine fish populations is characterised by reductionist and isolationist philosophies. Traditional fish management focuses on stocking and controls on fishing. This paper presents a consensus of scientists involved in the LARS workshop on the management of fish populations in large rivers. A move towards a more holistic philosophy is ad
Authors
Geoffrey E. Petts, Jack G. Imhoff, Bruce A. Manny, John F. B. Maher, Stephen B. Weisberg
Development of a benthic invertebrate objective for mesotrophic Great Lakes waters
A biological indicator of mesotrophic conditions should (1) provide an appropriate and interpretable objective; (2) be achievable if corrective measures are taken (i.e., it should be within the expected environmental range of the system); and (3) allow measurement of progress toward the objective. Historical data from the Great Lakes suggest that population density of the burrowing mayfly, Hexagen
Authors
Trefor B. Reynoldson, Donald W. Schloesser, Bruce A. Manny
Use of aerial photography to inventory aquatic vegetation
This study demonstrates the feasibility of using low-altitude aerial photography to inventory submersed macrophytes in the connecting channels of the Great Lakes. For this purpose, we obtained aerial color transparencies and collateral ground truth information about submersed vegetation at 160 stations within four study sites in the St. Clair and Detroit rivers, September 17 to October 4, 1984. Ph
Authors
Donald W. Schloesser, Charles L. Brown, Bruce A. Manny