James T Rogala (Former Employee)
Science and Products
Filter Total Items: 25
Nutrient cycling, connectivity, and free-floating plant abundance in backwater lakes of the Upper Mississippi River
River eutrophication may cause the formation of dense surface mats of free floating plants (FFP; e.g., duckweeds and filamentous algae) which may adversely affect the ecosystem. We investigated associations among hydraulic connectivity to the channel, nutrient cycling, FFP, submersed aquatic vegetation (SAV), and dissolved oxygen concentration (DO) in ten backwater lakes of the Upper Mississippi R
Authors
Jeffrey N. Houser, Shawn M. Giblin, William F. James, H.A. Langrehr, James T. Rogala, John F. Sullivan, Brian R. Gray
Treating floodplain lakes of large rivers as study units for variables that vary within lakes; an evaluation using chlorophyll a and inorganic suspended solids data from floodplain lakes of the Upper Mississippi River
Contiguous floodplain lakes ('lakes') have historically been used as study units for comparative studies of limnological variables that vary within lakes. The hierarchical nature of these studies implies that study variables may be correlated within lakes and that covariate associations may differ not only among lakes but also by spatial scale. We evaluated the utility of treating lakes as study u
Authors
B. R. Gray, J.R. Rogala, J.N. Houser
Application of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects
Models based upon coastal engineering equations have been developed to quantify wind fetch length and several physical wave characteristics including significant height, length, peak period, maximum orbital velocity, and shear stress. These models were used to quantify differences in proposed island construction designs for three Habitat Rehabilitation and Enhancement Projects (HREPs) in the U.S.
Authors
Jason J. Rohweder, James T. Rogala, Barry L. Johnson, Dennis Anderson, Steve Clark, Ferris Chamberlin
Patterns in species richness and assemblage structure of native mussels in the Upper Mississippi River
1. To evaluate patterns in mussel assemblages in the Upper Mississippi River (UMR), data from systematic surveys of mussels conducted in three large reaches (Navigation Pools 5, 6, and 18) from 2005–2007 were analysed. 2. Nonmetric multi-dimensional scaling analyses and permutation tests indicated that assemblages differed among reaches. The mussel assemblage in Pool 18 was substantially different
Authors
Steven J. Zigler, Teresa J. Newton, Mike Davis, James T. Rogala
Population assessment and potential functional roles of native mussels in the Upper Mississippi River
1. Despite a heightened global concern for native mussels, fundamental research on mussel ecology in large rivers is lacking. These gaps in knowledge about where mussels occur, and why, are limiting habitat restoration activities. 2. Large-scale systematic surveys for native mussels in three reaches of the Upper Mississippi River documented mussel communities composed of 16–23 species and ranging
Authors
Teresa J. Newton, Steven J. Zigler, James T. Rogala, Brian R. Gray, Mike Davis
Evaluation of single and two-stage adaptive sampling designs for estimation of density and abundance of freshwater mussels in a large river
Reliable estimates of abundance are needed to assess consequences of proposed habitat restoration and enhancement projects on freshwater mussels in the Upper Mississippi River (UMR). Although there is general guidance on sampling techniques for population assessment of freshwater mussels, the actual performance of sampling designs can depend critically on the population density and spatial distrib
Authors
D. R. Smith, J. T. Rogala, B. R. Gray, S. J. Zigler, T.J. Newton
Cumulative effects of restoration efforts on ecological characteristics of an open water area within the Upper Mississippi River
Ecological restoration efforts in large rivers generally aim to ameliorate ecological effects associated with large-scale modification of those rivers. This study examined whether the effects of restoration efforts-specifically those of island construction-within a largely open water restoration area of the Upper Mississippi River (UMR) might be seen at the spatial scale of that 3476ha area. The c
Authors
B. R. Gray, W. Shi, J.N. Houser, J. T. Rogala, Z. Guan, J. L. Cochran-Biederman
Application of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects
Models based upon coastal engineering equations have been developed to quantify wind fetch length and several physical wave characteristics including significant height, length, peak period, maximum orbital velocity, and shear stress. These models, developed using Environmental Systems Research Institute's ArcGIS 9.2 Geographic Information System platform, were used to quantify differences in prop
Authors
Jason J. Rohweder, James T. Rogala, Barry L. Johnson, Dennis Anderson, Steve Clark, Ferris Chamberlin, Kip Runyon
Chlorophyll a and inorganic suspended solids in backwaters of the upper Mississippi River system: Backwater lake effects and their associations with selected environmental predictors
The Long Term Resource Monitoring Program (LTRMP) uses a stratified random sampling design to obtain water quality statistics within selected study reaches of the Upper Mississippi River System (UMRS). LTRMP sampling strata are based on aquatic area types generally found in large rivers (e.g., main channel, side channel, backwater, and impounded areas). For hydrologically well-mixed strata (i.e.,
Authors
James T. Rogala, Brian R. Gray
Modelling habitat associations with fingernail clam (Family: Sphaeriidae) counts at multiple spatial scales using hierarchical count models
1. Macroinvertebrate count data often exhibit nested or hierarchical structure. Examples include multiple measurements along each of a set of streams, and multiple synoptic measurements from each of a set of ponds. With data exhibiting hierarchical structure, outcomes at both sampling (e.g. within stream) and aggregated (e.g. stream) scales are often of interest. Unfortunately, methods for modelli
Authors
Brian R. Gray, Roger J. Haro, James T. Rogala, Jennifer S. Sauer
Pool 13 drawdown: Predicting success rates and affected areas
The likelihood of 1- or 2-foot drawdowns, and the area affected by such alternative drawdowns, was estimated for Pool 13 on the Upper Mississippi River. Minimum water surface (elevation) requirements were compared to computed water surface profiles to determine a critical low flow that would allow a navigation channel 400 feet wide and 10.5 feet deep. An upper limit on flow was established based o
Authors
James T. Rogala, Joseph H. Wlosinski, Kevin J. Landwehr
Hydrologic modification to improve habitat in riverine lakes: Management objectives, experimental approach, and initial conditions
The Finger Lakes habitat-rehabilitation project is intended to improve physical and chemical conditions for fish in six connected back water lakes in Navigation Pool 5 of the upper Missouri River. The primary management objective is to improve water temperature, dissolved oxygen concentration and current velocity during winter for bluegills, Lepomis macrochirus, and black crappies, Pomoxis nigroma
Authors
Barry L. Johnson, John W. Barko, Yuri Gerasimov, William F. James, Alexander Litvinov, Teresa J. Naimo, James G. Wiener, Robert F. Gaugush, James T. Rogala, Sara J. Rogers
Science and Products
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Filter Total Items: 25
Nutrient cycling, connectivity, and free-floating plant abundance in backwater lakes of the Upper Mississippi River
River eutrophication may cause the formation of dense surface mats of free floating plants (FFP; e.g., duckweeds and filamentous algae) which may adversely affect the ecosystem. We investigated associations among hydraulic connectivity to the channel, nutrient cycling, FFP, submersed aquatic vegetation (SAV), and dissolved oxygen concentration (DO) in ten backwater lakes of the Upper Mississippi RAuthorsJeffrey N. Houser, Shawn M. Giblin, William F. James, H.A. Langrehr, James T. Rogala, John F. Sullivan, Brian R. GrayTreating floodplain lakes of large rivers as study units for variables that vary within lakes; an evaluation using chlorophyll a and inorganic suspended solids data from floodplain lakes of the Upper Mississippi River
Contiguous floodplain lakes ('lakes') have historically been used as study units for comparative studies of limnological variables that vary within lakes. The hierarchical nature of these studies implies that study variables may be correlated within lakes and that covariate associations may differ not only among lakes but also by spatial scale. We evaluated the utility of treating lakes as study uAuthorsB. R. Gray, J.R. Rogala, J.N. HouserApplication of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects
Models based upon coastal engineering equations have been developed to quantify wind fetch length and several physical wave characteristics including significant height, length, peak period, maximum orbital velocity, and shear stress. These models were used to quantify differences in proposed island construction designs for three Habitat Rehabilitation and Enhancement Projects (HREPs) in the U.S.AuthorsJason J. Rohweder, James T. Rogala, Barry L. Johnson, Dennis Anderson, Steve Clark, Ferris ChamberlinPatterns in species richness and assemblage structure of native mussels in the Upper Mississippi River
1. To evaluate patterns in mussel assemblages in the Upper Mississippi River (UMR), data from systematic surveys of mussels conducted in three large reaches (Navigation Pools 5, 6, and 18) from 2005–2007 were analysed. 2. Nonmetric multi-dimensional scaling analyses and permutation tests indicated that assemblages differed among reaches. The mussel assemblage in Pool 18 was substantially differentAuthorsSteven J. Zigler, Teresa J. Newton, Mike Davis, James T. RogalaPopulation assessment and potential functional roles of native mussels in the Upper Mississippi River
1. Despite a heightened global concern for native mussels, fundamental research on mussel ecology in large rivers is lacking. These gaps in knowledge about where mussels occur, and why, are limiting habitat restoration activities. 2. Large-scale systematic surveys for native mussels in three reaches of the Upper Mississippi River documented mussel communities composed of 16–23 species and rangingAuthorsTeresa J. Newton, Steven J. Zigler, James T. Rogala, Brian R. Gray, Mike DavisEvaluation of single and two-stage adaptive sampling designs for estimation of density and abundance of freshwater mussels in a large river
Reliable estimates of abundance are needed to assess consequences of proposed habitat restoration and enhancement projects on freshwater mussels in the Upper Mississippi River (UMR). Although there is general guidance on sampling techniques for population assessment of freshwater mussels, the actual performance of sampling designs can depend critically on the population density and spatial distribAuthorsD. R. Smith, J. T. Rogala, B. R. Gray, S. J. Zigler, T.J. NewtonCumulative effects of restoration efforts on ecological characteristics of an open water area within the Upper Mississippi River
Ecological restoration efforts in large rivers generally aim to ameliorate ecological effects associated with large-scale modification of those rivers. This study examined whether the effects of restoration efforts-specifically those of island construction-within a largely open water restoration area of the Upper Mississippi River (UMR) might be seen at the spatial scale of that 3476ha area. The cAuthorsB. R. Gray, W. Shi, J.N. Houser, J. T. Rogala, Z. Guan, J. L. Cochran-BiedermanApplication of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects
Models based upon coastal engineering equations have been developed to quantify wind fetch length and several physical wave characteristics including significant height, length, peak period, maximum orbital velocity, and shear stress. These models, developed using Environmental Systems Research Institute's ArcGIS 9.2 Geographic Information System platform, were used to quantify differences in propAuthorsJason J. Rohweder, James T. Rogala, Barry L. Johnson, Dennis Anderson, Steve Clark, Ferris Chamberlin, Kip RunyonChlorophyll a and inorganic suspended solids in backwaters of the upper Mississippi River system: Backwater lake effects and their associations with selected environmental predictors
The Long Term Resource Monitoring Program (LTRMP) uses a stratified random sampling design to obtain water quality statistics within selected study reaches of the Upper Mississippi River System (UMRS). LTRMP sampling strata are based on aquatic area types generally found in large rivers (e.g., main channel, side channel, backwater, and impounded areas). For hydrologically well-mixed strata (i.e.,AuthorsJames T. Rogala, Brian R. GrayModelling habitat associations with fingernail clam (Family: Sphaeriidae) counts at multiple spatial scales using hierarchical count models
1. Macroinvertebrate count data often exhibit nested or hierarchical structure. Examples include multiple measurements along each of a set of streams, and multiple synoptic measurements from each of a set of ponds. With data exhibiting hierarchical structure, outcomes at both sampling (e.g. within stream) and aggregated (e.g. stream) scales are often of interest. Unfortunately, methods for modelliAuthorsBrian R. Gray, Roger J. Haro, James T. Rogala, Jennifer S. SauerPool 13 drawdown: Predicting success rates and affected areas
The likelihood of 1- or 2-foot drawdowns, and the area affected by such alternative drawdowns, was estimated for Pool 13 on the Upper Mississippi River. Minimum water surface (elevation) requirements were compared to computed water surface profiles to determine a critical low flow that would allow a navigation channel 400 feet wide and 10.5 feet deep. An upper limit on flow was established based oAuthorsJames T. Rogala, Joseph H. Wlosinski, Kevin J. LandwehrHydrologic modification to improve habitat in riverine lakes: Management objectives, experimental approach, and initial conditions
The Finger Lakes habitat-rehabilitation project is intended to improve physical and chemical conditions for fish in six connected back water lakes in Navigation Pool 5 of the upper Missouri River. The primary management objective is to improve water temperature, dissolved oxygen concentration and current velocity during winter for bluegills, Lepomis macrochirus, and black crappies, Pomoxis nigromaAuthorsBarry L. Johnson, John W. Barko, Yuri Gerasimov, William F. James, Alexander Litvinov, Teresa J. Naimo, James G. Wiener, Robert F. Gaugush, James T. Rogala, Sara J. Rogers