Bruce A Manny (Former Employee)
Science and Products
Filter Total Items: 63
Burrowing mayflies in Lake Erie - a review
This paper describes the life history, distribution, and abundance of Hexagenia in Lake Erie, as shown by sediment core samples containing preserved Hexagenia remains dating back to about 1740, periodic sampling of living nymphal populations since about 1930, observations of emergences and mating swarms of adults, and the incidence of Hexagenia in fish stomachs. The roles of eutrophication and an
Authors
Thomas A. Edsall, C.P. Madenjian, B.A. Manny
Recovery of burrowing mayflies (Ephemeroptera: Ephemeridae: Hexagenia) in western Lake Erie
Burrowing mayflies (Hexagenia spp.) are native to western Lake Erie and were abundant until the 1950s, when they disappeared due to degraded water and sediment quality. Nymphs were absent from the sediments of most of western Lake Erie after the 1950s, although small, widely disjunct populations apparently persisted near shore. Sediment samples collected in 1993 revealed several small populations
Authors
Kenneth A. Krieger, Don W. Schloesser, Bruce A. Manny, Carmen E. Trisler, Susan E. Heady, Jan J.H. Ciborowski, Kenneth M. Muth
Oligochaete fauna of western Lake Erie 1961 and 1982: Signs of sediment quality recovery
The oligochaete fauna at 40 stations in western Lake Erie were collected in 1982 and compared to oligochaete fauna collected similarly in 1961. A total of 34 taxa, representing 18 Tubificidae and 16 Naididae, were identified. Changes in the proportions of low, moderate, and heavy polluted sediments, as determined by ranges of total numbers of oligochaetes, indicate that, in general, heavy pollutio
Authors
Don W. Schloesser, Trefor B. Reynoldson, Bruce A. Manny
An evaluation of lake trout reproductive habitat on Clay Banks Reef, northwestern Lake Michigan
The extinction of the native populations of lake trout (Salvelinus namaycush) in Lake Michigan in about 1956 has been followed by a decades-long attempt to reestablish self-sustaining populations of this valuable species in habitats it formerly occupied throughout the lake. One of the most recent management strategies designed to facilitate recovery was to make a primary management objective the e
Authors
Thomas A. Edsall, Mark E. Holey, Bruce A. Manny, Gregory W. Kennedy
Lake trout spawning habitat in the Great Lakes - a review of current knowledge
We review existing information on lake trout spawning habitat, which might indicate whether habitat is now a limiting factor in lake trout reproductive success. Lake trout spawning habitat quality is defined by the presence or absence of olfactory cues for homing, reef location with respect to the shoreline, water depth, proximity to nursery areas, reef size, contour, substrate size and shape, dep
Authors
J. Ellen Marsden, John M. Casselman, Thomas A. Edsall, Robert F. Elliott, John D. Fitzsimons, William H. Horns, Bruce A. Manny, Scott C. McAughey, Peter G. Sly, Bruce L. Swanson
Survival of lake trout eggs on reputed spawning grounds in Lakes Huron and Superior: In situ incubation, 1987-1988
Lake trout reproduce widely in Lake Superior but little in Lake Huron. We examined whether survival of lake trout eggs and fry in either lake was reduced by physical disturbances and swim-up mortality. Eggs were collected from feral lake trout in Lake Superior and placed in 108 plastic incubators. A total of 48 incubators was set at Partridge Island Reef in southern Lake Superior, 48 were set at P
Authors
Bruce A. Manny, Thomas A. Edsall, James W. Peck, Gregory W. Kennedy, Anthony M. Frank
Nutrient additions by waterfowl to lakes and reservoirs: predicting their effects on productivity and water quality
Lakes and reservoirs provide water for human needs and habitat for aquatic birds. Managers of such waters may ask whether nutrients added by waterfowl degrade water quality. For lakes and reservoirs where primary productivity is limited by phosphorus (P), we developed a procedure that integrates annual P loads from waterfowl and other external sources, applies a nutrient load-response model, and
Authors
Bruce A. Manny, W.C. Johnson, R.G. Wetzel
Production of Hexagenia limbata nymphs in contaminated sediments in the Upper Great Lakes connecting channels
In April through October 1986, we sampled sediments and populations of nymphs of the burrowing mayfly, Hexagenia limbata (Serville), at 11 locations throughout the connecting channels of the upper Great Lakes, to determine if sediment contaminants adversely affected nymph production. Production over this period was high (980 to 9231 mg dry wt m-2) at the five locations where measured sediment leve
Authors
Thomas A. Edsall, Bruce A. Manny, Donald W. Schloesser, Susan J. Nichols, Anthony M. Frank
Long-term decline in freshwater mussels (Bivalvia: Unionidae) of the western basin of Lake Erie
Long-term trends in the abundance of unionids in the western basin of Lake Erie were examined from data collected at 17 stations in 1961, 1972, and 1982. The mean number of unionids at these stations declined over this time period, decreasing from 10 m−2 in 1961, to 6 m−2 in 1972, down to 4 m−2 in 1982. This decline in abundance was reflected in the decrease in the number of stations where mussels
Authors
Thomas F. Nalepa, Bruce A. Manny, James C. Roth, Samuel C. Mozley, Donald W. Schloesser
The Detroit River: Effects of contaminants and human activities on aquatic plants and animals and their habitats
Despite the extensive urbanization of its watershed, the Detroit River still supports diverse fish and wildlife populations. Conflicting uses of the river for waste disposal, water withdrawals, shipping, recreation, and fishing require innovative management. Chemicals added by man to the Detroit River have adversely affected the health and habitats of the river's plants and animals. In 1985, as pa
Authors
Bruce A. Manny, David Kenaga
Heavy metals in aquatic macrophytes drifting in a large river
Macrophytes drifting throughout the water column in the Detroit River were collected monthly from May to October 1985 to estimate the quantities of heavy metals being transported to Lake Erie by the plants. Most macrophytes (80–92% by weight) drifted at the water surface. Live submersed macrophytes made up the bulk of each sample. The most widely distributed submersed macrophyte in the river, Amer
Authors
Bruce A. Manny, Susan J. Nichols, Donald W. Schloesser
Heavy metal contamination of sediments in the upper connecting channels of the Great Lakes
In 1985, sampling at 250 stations throughout the St. Marys, St. Clair, and Detroit rivers and Lake St. Clair — the connecting channels of the upper Great Lakes — revealed widespread metal contamination of the sediments. Concentrations of cadmium, chromium, copper, lead, mercury, nickel, and zinc each exceeded U.S. Environmental Protection Agency sediment pollution guidelines at one or more station
Authors
S. Jerrine Nichols, Bruce A. Manny, Donald W. Schloesser, Thomas A. Edsall
Science and Products
Filter Total Items: 63
Burrowing mayflies in Lake Erie - a review
This paper describes the life history, distribution, and abundance of Hexagenia in Lake Erie, as shown by sediment core samples containing preserved Hexagenia remains dating back to about 1740, periodic sampling of living nymphal populations since about 1930, observations of emergences and mating swarms of adults, and the incidence of Hexagenia in fish stomachs. The roles of eutrophication and an
Authors
Thomas A. Edsall, C.P. Madenjian, B.A. Manny
Recovery of burrowing mayflies (Ephemeroptera: Ephemeridae: Hexagenia) in western Lake Erie
Burrowing mayflies (Hexagenia spp.) are native to western Lake Erie and were abundant until the 1950s, when they disappeared due to degraded water and sediment quality. Nymphs were absent from the sediments of most of western Lake Erie after the 1950s, although small, widely disjunct populations apparently persisted near shore. Sediment samples collected in 1993 revealed several small populations
Authors
Kenneth A. Krieger, Don W. Schloesser, Bruce A. Manny, Carmen E. Trisler, Susan E. Heady, Jan J.H. Ciborowski, Kenneth M. Muth
Oligochaete fauna of western Lake Erie 1961 and 1982: Signs of sediment quality recovery
The oligochaete fauna at 40 stations in western Lake Erie were collected in 1982 and compared to oligochaete fauna collected similarly in 1961. A total of 34 taxa, representing 18 Tubificidae and 16 Naididae, were identified. Changes in the proportions of low, moderate, and heavy polluted sediments, as determined by ranges of total numbers of oligochaetes, indicate that, in general, heavy pollutio
Authors
Don W. Schloesser, Trefor B. Reynoldson, Bruce A. Manny
An evaluation of lake trout reproductive habitat on Clay Banks Reef, northwestern Lake Michigan
The extinction of the native populations of lake trout (Salvelinus namaycush) in Lake Michigan in about 1956 has been followed by a decades-long attempt to reestablish self-sustaining populations of this valuable species in habitats it formerly occupied throughout the lake. One of the most recent management strategies designed to facilitate recovery was to make a primary management objective the e
Authors
Thomas A. Edsall, Mark E. Holey, Bruce A. Manny, Gregory W. Kennedy
Lake trout spawning habitat in the Great Lakes - a review of current knowledge
We review existing information on lake trout spawning habitat, which might indicate whether habitat is now a limiting factor in lake trout reproductive success. Lake trout spawning habitat quality is defined by the presence or absence of olfactory cues for homing, reef location with respect to the shoreline, water depth, proximity to nursery areas, reef size, contour, substrate size and shape, dep
Authors
J. Ellen Marsden, John M. Casselman, Thomas A. Edsall, Robert F. Elliott, John D. Fitzsimons, William H. Horns, Bruce A. Manny, Scott C. McAughey, Peter G. Sly, Bruce L. Swanson
Survival of lake trout eggs on reputed spawning grounds in Lakes Huron and Superior: In situ incubation, 1987-1988
Lake trout reproduce widely in Lake Superior but little in Lake Huron. We examined whether survival of lake trout eggs and fry in either lake was reduced by physical disturbances and swim-up mortality. Eggs were collected from feral lake trout in Lake Superior and placed in 108 plastic incubators. A total of 48 incubators was set at Partridge Island Reef in southern Lake Superior, 48 were set at P
Authors
Bruce A. Manny, Thomas A. Edsall, James W. Peck, Gregory W. Kennedy, Anthony M. Frank
Nutrient additions by waterfowl to lakes and reservoirs: predicting their effects on productivity and water quality
Lakes and reservoirs provide water for human needs and habitat for aquatic birds. Managers of such waters may ask whether nutrients added by waterfowl degrade water quality. For lakes and reservoirs where primary productivity is limited by phosphorus (P), we developed a procedure that integrates annual P loads from waterfowl and other external sources, applies a nutrient load-response model, and
Authors
Bruce A. Manny, W.C. Johnson, R.G. Wetzel
Production of Hexagenia limbata nymphs in contaminated sediments in the Upper Great Lakes connecting channels
In April through October 1986, we sampled sediments and populations of nymphs of the burrowing mayfly, Hexagenia limbata (Serville), at 11 locations throughout the connecting channels of the upper Great Lakes, to determine if sediment contaminants adversely affected nymph production. Production over this period was high (980 to 9231 mg dry wt m-2) at the five locations where measured sediment leve
Authors
Thomas A. Edsall, Bruce A. Manny, Donald W. Schloesser, Susan J. Nichols, Anthony M. Frank
Long-term decline in freshwater mussels (Bivalvia: Unionidae) of the western basin of Lake Erie
Long-term trends in the abundance of unionids in the western basin of Lake Erie were examined from data collected at 17 stations in 1961, 1972, and 1982. The mean number of unionids at these stations declined over this time period, decreasing from 10 m−2 in 1961, to 6 m−2 in 1972, down to 4 m−2 in 1982. This decline in abundance was reflected in the decrease in the number of stations where mussels
Authors
Thomas F. Nalepa, Bruce A. Manny, James C. Roth, Samuel C. Mozley, Donald W. Schloesser
The Detroit River: Effects of contaminants and human activities on aquatic plants and animals and their habitats
Despite the extensive urbanization of its watershed, the Detroit River still supports diverse fish and wildlife populations. Conflicting uses of the river for waste disposal, water withdrawals, shipping, recreation, and fishing require innovative management. Chemicals added by man to the Detroit River have adversely affected the health and habitats of the river's plants and animals. In 1985, as pa
Authors
Bruce A. Manny, David Kenaga
Heavy metals in aquatic macrophytes drifting in a large river
Macrophytes drifting throughout the water column in the Detroit River were collected monthly from May to October 1985 to estimate the quantities of heavy metals being transported to Lake Erie by the plants. Most macrophytes (80–92% by weight) drifted at the water surface. Live submersed macrophytes made up the bulk of each sample. The most widely distributed submersed macrophyte in the river, Amer
Authors
Bruce A. Manny, Susan J. Nichols, Donald W. Schloesser
Heavy metal contamination of sediments in the upper connecting channels of the Great Lakes
In 1985, sampling at 250 stations throughout the St. Marys, St. Clair, and Detroit rivers and Lake St. Clair — the connecting channels of the upper Great Lakes — revealed widespread metal contamination of the sediments. Concentrations of cadmium, chromium, copper, lead, mercury, nickel, and zinc each exceeded U.S. Environmental Protection Agency sediment pollution guidelines at one or more station
Authors
S. Jerrine Nichols, Bruce A. Manny, Donald W. Schloesser, Thomas A. Edsall