Patrick L Hudson, PhD
Patrick Hudson is a Scientist Emeritus based in Ann Arbor, MI.
Science and Products
Publications by this scientist
Filter Total Items: 39
Limitations to lake trout (Salvelinus namaycush) rehabilitation in the Great Lakes imposed by biotic interactions occurring at early life stages
We examine evidence that biotic factors, particularly predation, may be limiting early survival of wild lake trout (Salvelinus namaycush) juveniles in many areas of the Great Lakes. The Great Lakes contain numerous potential predators of lake trout eggs and fry, some of which are recent invaders, and most of which were probably absent when lake trout most recently re-invaded the Great Lakes after
Authors
Michael L. Jones, Gary W. Eck, David O. Evans, Mary C. Fabrizio, Michael H. Hoff, Patrick L. Hudson, John Janssen, David Jude, Robert O'Gorman, Jacqueline F. Savino
New records of Ergasilus (Copepoda: Ergasilidae) in the Laurentian Great Lakes, including a lakewide review of records and host associations
Ergasilus nerkae was found infecting ninespine stickleback (Pungitius pungitius) in lakes Huron, Michigan, and Superior and threespine stickleback (Gasterosteus aculeatus) and round whitefish (Prosopium cylindraceum) in Lake Huron. Based upon the literature and study of archived material, we propose that E. nerkae is enzootic to the Great Lakes and that ninespine stickleback are a preferred host i
Authors
Patrick L. Hudson, Charles A. Bowen, Ralph M. Stedman
Effects of pulsed turbidity and vessel traffic on lake herring eggs and larvae
Proposals to extend commercial shipping in the St. Marys River (connecting Lakes Superior and Huron) to include winter months have raised concerns regarding its effect on lake herring (Coregonus artedi). Because lake herring spawn in fall and their eggs overwinter in the river and hatch in spring, their hatching success could be impacted by early opening of the locks in spring. Our laboratory stud
Authors
Jacqueline F. Savino, Marc A. Blouin, Bruce M. Davis, Patrick L. Hudson, Thomas N. Todd, Guy W. Fleischer
Review of habitat classification schemes appropriate to streams, rivers, and connecting channels in the Great Lakes drainage system
Studies of lotic classification, zonation, and distribution carried out since the turn of the century were reviewed for their use in developing a habitat classification scheme for flowing water in the Great Lakes drainage basin. Seventy papers, dealing mainly with fish but including benthos, were organized into four somewhat distinct groups. A heirarchical scale of habitat measurements is sugges
Authors
Patrick L. Hudson, R.W. Griffiths, T.J. Wheaton
Distribution and abundance of caddisflies (Trichoptera) in the St. Clair-Detroit River system
Abundance and distribution patterns of the caddisflies of the St. Clair-Detroit River system were investigated in 1983–84. Collections of both adults and larvae yielded 70 species representing 34 genera and 12 families. Leptoceridae and Hydroptilidae were the most common families and Ceraclea the most common genus in number of species. This study adds 21 species to the Michigan record. The hydrops
Authors
Bruce M. Davis, Patrick L. Hudson, Brian J. Armitage
Chironomidae of the southeastern United States: a checklist of species and notes on biology, distribution, and habitat
We provide a current listing of the species of midges (Diptera:Chironomidae) in the southeastern United States (Alabama, Florida, Georgia, North Carolina, South Carolina, and Tennessee). This checklist should aid research on this group of insects, which have often proved useful in the assessment of water quality. We document each species' distribution and general habitat and provide the best taxon
Authors
Patrick L. Hudson, David R. Lenat, Broughton A. Caldwell, David Smith
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
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
Thermal and dissolved oxygen characteristics of a South Carolina cooling reservoir
Temperature and dissolved oxygen concentrations were measured monthly from January 1971 to December 1982 at 1-m depth intervals at 13 stations in Keowee Reservoir in order to characterize spatial and temporal changes associated with operation of the Oconee Nuclear Station. The reservoir water column was i to 4°C warmer in operational than in non-operational years. The thermo-dine was at depths of
Authors
James L. Oliver, Patrick L. Hudson
Unusual larval habitats and life history of chironomid (Diptera) genera
Ninety-three genera, representing all subfamilies of Chironomidae, are organized into 9 categories of unusual habitats or life history including hygropetric, riparian (bank, floodplain, upland), hyporheic, symbiotic, and intertidal; others live in water held in plants or mine into unusual substrates. In riparian zones precise location of optimum habitat is difficult to determine as is definition o
Authors
Patrick L. Hudson
Distribution and habitat of Nitellopsis obtuse (Characeae) in the Laurentian Great Lakes
Nitellopsis obtusa, a macroalga (Characeae) native to Europe and Asia, was found in U.S. waters of the St. Clair-Detroit River system in 1983, thus extending the range of this taxon into the Laurentian Great Lakes about 850 km from the St. Lawrence River where it was first discovered in North America in 1978. Its occurrence only in water frequented by commercial shipping vessels suggests that it i
Authors
Donald W. Schloesser, Patrick L. Hudson, S. Jerrine Nichols
Distribution and habitat of Nitellopsis obtusa (Characeae) in the Laurentian Great Lakes
Nitellopsis obtusa, a macroalga (Characeae) native to Europe and Asia, was found in U.S. waters of the St. Clair-Detroit River system in 1983, thus extending the range of this taxon into the Laurentian Great Lakes about 850 km from the St. Lawrence River where it was first discovered in North America in 1978. Its occurrence only in water frequented by commercial shipping vessels suggests that it i
Authors
Donald W. Schloesser, Patrick L. Hudson, S. Jerrine Nichols
Science and Products
- Publications
Publications by this scientist
Filter Total Items: 39Limitations to lake trout (Salvelinus namaycush) rehabilitation in the Great Lakes imposed by biotic interactions occurring at early life stages
We examine evidence that biotic factors, particularly predation, may be limiting early survival of wild lake trout (Salvelinus namaycush) juveniles in many areas of the Great Lakes. The Great Lakes contain numerous potential predators of lake trout eggs and fry, some of which are recent invaders, and most of which were probably absent when lake trout most recently re-invaded the Great Lakes afterAuthorsMichael L. Jones, Gary W. Eck, David O. Evans, Mary C. Fabrizio, Michael H. Hoff, Patrick L. Hudson, John Janssen, David Jude, Robert O'Gorman, Jacqueline F. SavinoNew records of Ergasilus (Copepoda: Ergasilidae) in the Laurentian Great Lakes, including a lakewide review of records and host associations
Ergasilus nerkae was found infecting ninespine stickleback (Pungitius pungitius) in lakes Huron, Michigan, and Superior and threespine stickleback (Gasterosteus aculeatus) and round whitefish (Prosopium cylindraceum) in Lake Huron. Based upon the literature and study of archived material, we propose that E. nerkae is enzootic to the Great Lakes and that ninespine stickleback are a preferred host iAuthorsPatrick L. Hudson, Charles A. Bowen, Ralph M. StedmanEffects of pulsed turbidity and vessel traffic on lake herring eggs and larvae
Proposals to extend commercial shipping in the St. Marys River (connecting Lakes Superior and Huron) to include winter months have raised concerns regarding its effect on lake herring (Coregonus artedi). Because lake herring spawn in fall and their eggs overwinter in the river and hatch in spring, their hatching success could be impacted by early opening of the locks in spring. Our laboratory studAuthorsJacqueline F. Savino, Marc A. Blouin, Bruce M. Davis, Patrick L. Hudson, Thomas N. Todd, Guy W. FleischerReview of habitat classification schemes appropriate to streams, rivers, and connecting channels in the Great Lakes drainage system
Studies of lotic classification, zonation, and distribution carried out since the turn of the century were reviewed for their use in developing a habitat classification scheme for flowing water in the Great Lakes drainage basin. Seventy papers, dealing mainly with fish but including benthos, were organized into four somewhat distinct groups. A heirarchical scale of habitat measurements is suggesAuthorsPatrick L. Hudson, R.W. Griffiths, T.J. WheatonDistribution and abundance of caddisflies (Trichoptera) in the St. Clair-Detroit River system
Abundance and distribution patterns of the caddisflies of the St. Clair-Detroit River system were investigated in 1983–84. Collections of both adults and larvae yielded 70 species representing 34 genera and 12 families. Leptoceridae and Hydroptilidae were the most common families and Ceraclea the most common genus in number of species. This study adds 21 species to the Michigan record. The hydropsAuthorsBruce M. Davis, Patrick L. Hudson, Brian J. ArmitageChironomidae of the southeastern United States: a checklist of species and notes on biology, distribution, and habitat
We provide a current listing of the species of midges (Diptera:Chironomidae) in the southeastern United States (Alabama, Florida, Georgia, North Carolina, South Carolina, and Tennessee). This checklist should aid research on this group of insects, which have often proved useful in the assessment of water quality. We document each species' distribution and general habitat and provide the best taxonAuthorsPatrick L. Hudson, David R. Lenat, Broughton A. Caldwell, David SmithHydrological, 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 hiAuthorsClayton 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. BuschSubmersed 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 delayedAuthorsS. Jerrine Nichols, Donald W. Schloesser, Patrick L. HudsonThermal and dissolved oxygen characteristics of a South Carolina cooling reservoir
Temperature and dissolved oxygen concentrations were measured monthly from January 1971 to December 1982 at 1-m depth intervals at 13 stations in Keowee Reservoir in order to characterize spatial and temporal changes associated with operation of the Oconee Nuclear Station. The reservoir water column was i to 4°C warmer in operational than in non-operational years. The thermo-dine was at depths ofAuthorsJames L. Oliver, Patrick L. HudsonUnusual larval habitats and life history of chironomid (Diptera) genera
Ninety-three genera, representing all subfamilies of Chironomidae, are organized into 9 categories of unusual habitats or life history including hygropetric, riparian (bank, floodplain, upland), hyporheic, symbiotic, and intertidal; others live in water held in plants or mine into unusual substrates. In riparian zones precise location of optimum habitat is difficult to determine as is definition oAuthorsPatrick L. HudsonDistribution and habitat of Nitellopsis obtuse (Characeae) in the Laurentian Great Lakes
Nitellopsis obtusa, a macroalga (Characeae) native to Europe and Asia, was found in U.S. waters of the St. Clair-Detroit River system in 1983, thus extending the range of this taxon into the Laurentian Great Lakes about 850 km from the St. Lawrence River where it was first discovered in North America in 1978. Its occurrence only in water frequented by commercial shipping vessels suggests that it iAuthorsDonald W. Schloesser, Patrick L. Hudson, S. Jerrine NicholsDistribution and habitat of Nitellopsis obtusa (Characeae) in the Laurentian Great Lakes
Nitellopsis obtusa, a macroalga (Characeae) native to Europe and Asia, was found in U.S. waters of the St. Clair-Detroit River system in 1983, thus extending the range of this taxon into the Laurentian Great Lakes about 850 km from the St. Lawrence River where it was first discovered in North America in 1978. Its occurrence only in water frequented by commercial shipping vessels suggests that it iAuthorsDonald W. Schloesser, Patrick L. Hudson, S. Jerrine Nichols