Publications
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Distribution of alewives in southeastern Lake Ontario in autumn and winter: a clue to winter mortalities
Alewives Alosa pseudoharengus in the Great Lakes are thought to avoid extreme cold in winter by moving to deep water where the temperature is usually highest because of inverse thermal stratification. Information collected in Lake Ontario during autumn and winter 1981–1984 with an echo sounder and bottom and midwater trawls indicated that many alewives remained at depths above 110 m, regardless of
Authors
Roger A. Bergstedt, Robert O'Gorman
Side-scan sonar mapping of lake trout spawning habitat in northern Lake Michigan
Native stocks of lake trout Salvelinus namaycush were virtually or completely extirpated from the lower four Great Lakes by the early 1960s. The failure of early attempts to reestablish self-sustaining populations of lake trout was attributed partly to the practice of stocking hatcheryreared juveniles at locations and over substrates that had not been used in the past for spawning by native fish.
Authors
Thomas A. Edsall, Thomas P. Poe, Robert T. Nester, Charles L. Brown
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
Submersed macrophyte communities before and after an episodic ice jam in the St. Clair and Detroit rivers
We conducted surveys in 1983 and 1984 of submersed macrophyte communities off six islands in the St. Clair and Detroit rivers using low altitude aerial photography and ground-truth collections. Sample collections in 1984 followed one of the coldest winters on record, during which ice up to 4 m thick developed in areas that were normally ice-free. Growth of many of the 20 taxa collected was delayed
Authors
S. Jerrine Nichols, Donald W. Schloesser, Patrick L. Hudson
Food of forage fishes in western Lake Erie, 1975-76
In western Lake Erie in the summer and fall of 1975–1976, food eaten by seven forage fishes—emerald shiner (Notropis atherinoides), spottail shiner (Notropis hudsonius), trout-perch (Percopsis omiscomaycus), andyoung-of-the-year (YOY) of alewife (Alosa pseudoharengus), gizzard shad (Dorosoma cepedianum), white bass (Morone chrysops), and freshwater drum (Aplodi-notus grunniens)—was divided among s
Authors
Kenneth M. Muth, Wolf-Dieter N. Busch
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
Sublethal effects of phenanthrene, nicotine, and pinane on Daphnia pulex
Chronic studies of Daphnia Pulex exposed to different concentrations of phenanthrene, nicotine, and pinane produced consistent sublethal effects among replicates and concentrations. The LOEC's for growth and fecundity with each chemical tested were 3 to 30% of the 48-hr EC50's. Growth decreased as concentration increased for each chemical tested, and fecundity approached zero at 2 to 5 times the L
Authors
Jacqueline F. Savino, Lila L. Tanabe
Behavioural interaction between fish predators and their prey: effects of plant density
Prey-specific anti-predatory behaviour under different degrees of structural complexity determines foraging success of predators. The behaviour of piscivorous fish (largemouth bass, Micropterus salmoides and northern pike, Esox lucius) and their prey (bluegills, Lepomis macrochirus, and fathead minnows, Pimephales promelas) were quantified in 60-min experiments in laboratory pools (2 multiplied by
Authors
Jacqueline F. Savino, Roy A. Stein
ROV dives under Great Lakes ice
Observations of the underside of ice have a wide variety of applications. Severe under-ice roughness can affect ice movements, rough under-ice surfaces can scour the bottom disturbing biota and man-made structures such as pipelines, and the flow rate of rivers is often affected by under-ice roughness. A few reported observations of the underside of an ice cover have been made, usually by cutting
Authors
S. J. Bolsenga, John E. Gannon, Gregory Kennedy, D. C. North, Charles E. Herdendorf
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
Migration and control of purple loosestrife (Lythrum salicaria L.) along highway corridors
The east-west density gradient and the pattern and mode of migration of the wetland exotic, purple loosestrife (Lythrum salicaria L.), were assessed in a survey of populations along the New York State Thruway from Albany to Buffalo to determine if the highway corridor contributed to the spread of this species. During the peak flowering season of late July to early August, individual colonies of pu
Authors
Douglas A. Wilcox
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