Robert Jacobson, PhD (Former Employee)
Science and Products
Filter Total Items: 14
Southeast Regional Assessment Project (SERAP): Assessing Global Change Impacts on Natural and Human Systems in the Southeast
The Southeastern United States spans a broad range of physiographic settings and maintains exceptionally high levels of faunal diversity. Unfortunately, many of these ecosystems are increasingly under threat due to rapid human development, and management agencies are increasingly aware of the potential effects that climate change will have on these ecosystems. Natural resource managers...
USGS-USFS Partnership to Help Managers Evaluate Conservation Strategies for Aquatic Ecosystems Based on Future Climate Projections
The Southeastern U.S. spans broad ranges of physiographic settings and contains a wide variety of aquatic systems that provide habitat for hundreds of endemic aquatic species that pose interesting challenges and opportunities for managers of aquatic resources, particularly in the face of climate change. For example, the Southeast contains the southernmost populations of the eastern brook...
Filter Total Items: 142
Hydraulics of freshwater mussel habitat in select reaches of the Big River, Missouri Hydraulics of freshwater mussel habitat in select reaches of the Big River, Missouri
The Big River is a tributary to the Meramec River in south-central Missouri. It drains an area that has been historically one of the largest lead producers in the world, and associated mine wastes have contaminated sediments in much of the river corridor. This study investigated hydraulic conditions in four study reaches to evaluate the potential contribution of physical habitat dynamics...
Authors
Maura O. Roberts, Robert Jacobson, Susannah Erwin
Remote sensing of visible dye concentrations during a tracer experiment on a large, turbid river Remote sensing of visible dye concentrations during a tracer experiment on a large, turbid river
Understanding dispersion in rivers is critical for numerous applications, such as characterizing larval drift for endangered fish species and responding to spills of hazardous materials. Injecting a visible dye into the river can yield insight on dispersion processes, but conventional field instrumentation yields limited data on variations in dye concentration over time at a few, fixed...
Authors
Carl Legleiter, Brandon Sansom, R. B. Jacobson
Stream classification and gravel-bar inventory for Buffalo National River and Ozark National Scenic Riverways Stream classification and gravel-bar inventory for Buffalo National River and Ozark National Scenic Riverways
The data summarized in this report provide a baseline characterization of the physical attributes of the riverine ecosystems in two landscapes managed by the National Park Service—Ozark National Scenic Riverways, Missouri, and Buffalo National River, Arkansas—to inform understanding and management of aquatic habitat. The study utilized a basin-scale approach and consisted of two...
Authors
Susannah Erwin, Robert Jacobson, Jabari Jones
Physical characteristics and simulated transport of pallid sturgeon and shovelnose sturgeon eggs Physical characteristics and simulated transport of pallid sturgeon and shovelnose sturgeon eggs
The imperiled pallid sturgeon (Scaphirhynchus albus) and closely related, but more common, shovelnose sturgeon (S. platorynchus) are believed to broadcast adhesive, demersal eggs in the current and over coarse substrate in turbid rivers of the North American midcontinent. It has been hypothesized that eggs settle immediately following fertilization, but field conditions preclude direct...
Authors
Kimberly Chojnacki, Susannah Erwin, Amy George, James Candrl, Robert Jacobson, Aaron Delonay
Characterization of pallid sturgeon (Scaphirhynchus albus) spawning habitat in the Lower Missouri River Characterization of pallid sturgeon (Scaphirhynchus albus) spawning habitat in the Lower Missouri River
Acipenseriformes (sturgeons and paddlefish) globally have declined throughout their range due to river fragmentation, habitat loss, overfishing, and degradation of water quality. In North America, pallid sturgeon (Scaphirhynchus albus) populations have experienced poor to no recruitment, or substantial levels of hybridization with the closely related shovelnose sturgeon (S. platorynchus)...
Authors
Caroline Elliott, Aaron Delonay, Kimberly Chojnacki, Robert Jacobson
A hydrogeomorphic classification of connectivity of large rivers of the Upper Midwest, United States A hydrogeomorphic classification of connectivity of large rivers of the Upper Midwest, United States
River connectivity is defined as the water-mediated exchange of matter, energy, and biota between different elements of the riverine landscape. Connectivity is an especially important concept in large-river corridors (channel plus floodplain ) because large rivers integrate fluxes of water, sediment, nutrients, contaminants, and other transported constituents emanating from large...
Authors
Robert Jacobson, Jason Rohweder, Nathan De Jager
Interior Least Tern sandbar nesting habitat measurements from Landsat Thematic Mapper imagery Interior Least Tern sandbar nesting habitat measurements from Landsat Thematic Mapper imagery
Sandbars of large sand-bedded rivers of the central United States serve important ecological functions to many species, including the endangered Interior Least Tern (Sternula antillarum, ILT). The ILT is a colonial bird that feeds on fish and nests primarily on riverine sandbars during its annual breeding season of around May through July, depending on region. During this time, ILTs...
Authors
Edward Bulliner, Caroline Elliott, Robert Jacobson, Casey Lott
Overview and progress of the pallid sturgeon assessment framework redesign process Overview and progress of the pallid sturgeon assessment framework redesign process
The Pallid Sturgeon Population Assessment Program (PSPAP) was initiated in 2003, and full implementation began in 2006, to monitor the trend of Scaphirhynchus albus (pallid sturgeon) and native fish communities in the Upper and Lower Missouri River Basins. The original PSPAP (v. 1.0) was a catch-effort based monitoring program where population abundance and trend were monitored using a...
Authors
Michael E. Colvin, Sara Reynolds, Robert Jacobson, Landon Pierce, Kirk Steffensen, Timothy Welker
Evaluating flow management as a strategy to recover an endangered sturgeon species in the Upper Missouri River, USA Evaluating flow management as a strategy to recover an endangered sturgeon species in the Upper Missouri River, USA
In the Upper Missouri River, Fort Peck and Garrison Dams limit the length of free‐flowing river available to the endangered pallid sturgeon. These barriers restrict the upstream migration of adults and downstream larval dispersal. A one‐dimensional (1D) modelling framework is currently in use to evaluate reservoir operation alternatives and to simulate drift of dispersing free embryos...
Authors
Susannah Erwin, Edward Bulliner, Craig Fischenich, Robert Jacobson, Patrick Braaten, Aaron Delonay
Bend-scale geomorphic classification and assessment of the Lower Missouri River from Sioux City, Iowa, to the Mississippi River for application to pallid sturgeon management Bend-scale geomorphic classification and assessment of the Lower Missouri River from Sioux City, Iowa, to the Mississippi River for application to pallid sturgeon management
Management actions intended to increase growth and survival of pallid sturgeon (Scaphirhynchus albus) age-0 larvae on the Lower Missouri River require a comprehensive understanding of the geomorphic habitat template of the river. The study described here had two objectives relating to where channel-reconfiguration projects should be located to optimize effectiveness. The first objective...
Authors
Robert Jacobson, Michael E. Colvin, Edward Bulliner, Darcy Pickard, Caroline Elliott
Assessment of adult pallid sturgeon fish condition, Lower Missouri River—Application of new information to the Missouri River Recovery Program Assessment of adult pallid sturgeon fish condition, Lower Missouri River—Application of new information to the Missouri River Recovery Program
During spring 2015, Nebraska Game and Parks Commission (NGPC) biologists noted that pallid sturgeon (Scaphirhynchus albus) were in poor condition during sampling associated with the Pallid Sturgeon Population Assessment Project and NGPC’s annual pallid sturgeon broodstock collection effort. These observations prompted concerns that reduced fish condition could compromise reproductive...
Authors
Michael Randall, Michael E. Colvin, Kirk Steffensen, Timothy Welker, Landon Pierce, Robert Jacobson
Non-USGS Publications**
Jacobson, R. B., 1986, Genesis and distribution of colluvium, Buffalo Creek Area, Marion County, West Virginia: Transportation Research Record, Transportation Research Board, v. 1089, p. 63-67.
Jacobson, R. B., and Coleman, D.J., 1986, Stratigraphy and recent evolution of Maryland Piedmont flood plains: American Journal of Science, v. 286, p. 617-637
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 14
Southeast Regional Assessment Project (SERAP): Assessing Global Change Impacts on Natural and Human Systems in the Southeast
The Southeastern United States spans a broad range of physiographic settings and maintains exceptionally high levels of faunal diversity. Unfortunately, many of these ecosystems are increasingly under threat due to rapid human development, and management agencies are increasingly aware of the potential effects that climate change will have on these ecosystems. Natural resource managers...
USGS-USFS Partnership to Help Managers Evaluate Conservation Strategies for Aquatic Ecosystems Based on Future Climate Projections
The Southeastern U.S. spans broad ranges of physiographic settings and contains a wide variety of aquatic systems that provide habitat for hundreds of endemic aquatic species that pose interesting challenges and opportunities for managers of aquatic resources, particularly in the face of climate change. For example, the Southeast contains the southernmost populations of the eastern brook...
Filter Total Items: 142
Hydraulics of freshwater mussel habitat in select reaches of the Big River, Missouri Hydraulics of freshwater mussel habitat in select reaches of the Big River, Missouri
The Big River is a tributary to the Meramec River in south-central Missouri. It drains an area that has been historically one of the largest lead producers in the world, and associated mine wastes have contaminated sediments in much of the river corridor. This study investigated hydraulic conditions in four study reaches to evaluate the potential contribution of physical habitat dynamics...
Authors
Maura O. Roberts, Robert Jacobson, Susannah Erwin
Remote sensing of visible dye concentrations during a tracer experiment on a large, turbid river Remote sensing of visible dye concentrations during a tracer experiment on a large, turbid river
Understanding dispersion in rivers is critical for numerous applications, such as characterizing larval drift for endangered fish species and responding to spills of hazardous materials. Injecting a visible dye into the river can yield insight on dispersion processes, but conventional field instrumentation yields limited data on variations in dye concentration over time at a few, fixed...
Authors
Carl Legleiter, Brandon Sansom, R. B. Jacobson
Stream classification and gravel-bar inventory for Buffalo National River and Ozark National Scenic Riverways Stream classification and gravel-bar inventory for Buffalo National River and Ozark National Scenic Riverways
The data summarized in this report provide a baseline characterization of the physical attributes of the riverine ecosystems in two landscapes managed by the National Park Service—Ozark National Scenic Riverways, Missouri, and Buffalo National River, Arkansas—to inform understanding and management of aquatic habitat. The study utilized a basin-scale approach and consisted of two...
Authors
Susannah Erwin, Robert Jacobson, Jabari Jones
Physical characteristics and simulated transport of pallid sturgeon and shovelnose sturgeon eggs Physical characteristics and simulated transport of pallid sturgeon and shovelnose sturgeon eggs
The imperiled pallid sturgeon (Scaphirhynchus albus) and closely related, but more common, shovelnose sturgeon (S. platorynchus) are believed to broadcast adhesive, demersal eggs in the current and over coarse substrate in turbid rivers of the North American midcontinent. It has been hypothesized that eggs settle immediately following fertilization, but field conditions preclude direct...
Authors
Kimberly Chojnacki, Susannah Erwin, Amy George, James Candrl, Robert Jacobson, Aaron Delonay
Characterization of pallid sturgeon (Scaphirhynchus albus) spawning habitat in the Lower Missouri River Characterization of pallid sturgeon (Scaphirhynchus albus) spawning habitat in the Lower Missouri River
Acipenseriformes (sturgeons and paddlefish) globally have declined throughout their range due to river fragmentation, habitat loss, overfishing, and degradation of water quality. In North America, pallid sturgeon (Scaphirhynchus albus) populations have experienced poor to no recruitment, or substantial levels of hybridization with the closely related shovelnose sturgeon (S. platorynchus)...
Authors
Caroline Elliott, Aaron Delonay, Kimberly Chojnacki, Robert Jacobson
A hydrogeomorphic classification of connectivity of large rivers of the Upper Midwest, United States A hydrogeomorphic classification of connectivity of large rivers of the Upper Midwest, United States
River connectivity is defined as the water-mediated exchange of matter, energy, and biota between different elements of the riverine landscape. Connectivity is an especially important concept in large-river corridors (channel plus floodplain ) because large rivers integrate fluxes of water, sediment, nutrients, contaminants, and other transported constituents emanating from large...
Authors
Robert Jacobson, Jason Rohweder, Nathan De Jager
Interior Least Tern sandbar nesting habitat measurements from Landsat Thematic Mapper imagery Interior Least Tern sandbar nesting habitat measurements from Landsat Thematic Mapper imagery
Sandbars of large sand-bedded rivers of the central United States serve important ecological functions to many species, including the endangered Interior Least Tern (Sternula antillarum, ILT). The ILT is a colonial bird that feeds on fish and nests primarily on riverine sandbars during its annual breeding season of around May through July, depending on region. During this time, ILTs...
Authors
Edward Bulliner, Caroline Elliott, Robert Jacobson, Casey Lott
Overview and progress of the pallid sturgeon assessment framework redesign process Overview and progress of the pallid sturgeon assessment framework redesign process
The Pallid Sturgeon Population Assessment Program (PSPAP) was initiated in 2003, and full implementation began in 2006, to monitor the trend of Scaphirhynchus albus (pallid sturgeon) and native fish communities in the Upper and Lower Missouri River Basins. The original PSPAP (v. 1.0) was a catch-effort based monitoring program where population abundance and trend were monitored using a...
Authors
Michael E. Colvin, Sara Reynolds, Robert Jacobson, Landon Pierce, Kirk Steffensen, Timothy Welker
Evaluating flow management as a strategy to recover an endangered sturgeon species in the Upper Missouri River, USA Evaluating flow management as a strategy to recover an endangered sturgeon species in the Upper Missouri River, USA
In the Upper Missouri River, Fort Peck and Garrison Dams limit the length of free‐flowing river available to the endangered pallid sturgeon. These barriers restrict the upstream migration of adults and downstream larval dispersal. A one‐dimensional (1D) modelling framework is currently in use to evaluate reservoir operation alternatives and to simulate drift of dispersing free embryos...
Authors
Susannah Erwin, Edward Bulliner, Craig Fischenich, Robert Jacobson, Patrick Braaten, Aaron Delonay
Bend-scale geomorphic classification and assessment of the Lower Missouri River from Sioux City, Iowa, to the Mississippi River for application to pallid sturgeon management Bend-scale geomorphic classification and assessment of the Lower Missouri River from Sioux City, Iowa, to the Mississippi River for application to pallid sturgeon management
Management actions intended to increase growth and survival of pallid sturgeon (Scaphirhynchus albus) age-0 larvae on the Lower Missouri River require a comprehensive understanding of the geomorphic habitat template of the river. The study described here had two objectives relating to where channel-reconfiguration projects should be located to optimize effectiveness. The first objective...
Authors
Robert Jacobson, Michael E. Colvin, Edward Bulliner, Darcy Pickard, Caroline Elliott
Assessment of adult pallid sturgeon fish condition, Lower Missouri River—Application of new information to the Missouri River Recovery Program Assessment of adult pallid sturgeon fish condition, Lower Missouri River—Application of new information to the Missouri River Recovery Program
During spring 2015, Nebraska Game and Parks Commission (NGPC) biologists noted that pallid sturgeon (Scaphirhynchus albus) were in poor condition during sampling associated with the Pallid Sturgeon Population Assessment Project and NGPC’s annual pallid sturgeon broodstock collection effort. These observations prompted concerns that reduced fish condition could compromise reproductive...
Authors
Michael Randall, Michael E. Colvin, Kirk Steffensen, Timothy Welker, Landon Pierce, Robert Jacobson
Non-USGS Publications**
Jacobson, R. B., 1986, Genesis and distribution of colluvium, Buffalo Creek Area, Marion County, West Virginia: Transportation Research Record, Transportation Research Board, v. 1089, p. 63-67.
Jacobson, R. B., and Coleman, D.J., 1986, Stratigraphy and recent evolution of Maryland Piedmont flood plains: American Journal of Science, v. 286, p. 617-637
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.