Zachary H Bowen, Ph.D.
Zachary is currently the Acting Deputy Associate Director for the Ecosystems Mission Area.
Science and Products
Filter Total Items: 16
Filter Total Items: 63
Sampling effort and estimates of species richness based on prepositioned area electrofisher samples Sampling effort and estimates of species richness based on prepositioned area electrofisher samples
Estimates of species richness based on electrofishing data are commonly used to describe the structure of fish communities. One electrofishing method for sampling riverine fishes that has become popular in the last decade is the prepositioned area electrofisher (PAE). We investigated the relationship between sampling effort and fish species richness at seven sites in the Tallapoosa River...
Authors
Zachary H. Bowen, Mary C. Freeman
U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative-2009 Annual Report U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative-2009 Annual Report
This is the second report produced by the U.S. Geological Survey (USGS) for the Wyoming Landscape Conservation Initiative (WLCI) to detail annual work activities. The first report described work activities for 2007 and 2008; this report covers work activities conducted in 2009. Important differences between the two reports are that (1) this report does not lump all the Effectiveness...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Laura R. H. Biewick, Steven W. Blecker, R. Sky Bristol, Natasha B. Carr, Anna D. Chalfoun, Geneva W. Chong, James E. Diffendorfer, Bradley C. Fedy, Steven L. Garman, Stephen S. Germaine, Richard I. Grauch, JoAnn M. Holloway, Collin G. Homer, Matthew Kauffman, Douglas Keinath, Natalie Latysh, Daniel J. Manier, Robert R. McDougal, Cynthia P. Melcher, Kirk A. Miller, Jessica Montag, Constance J. Nutt, Christopher J. Potter, Hall Sawyer, Spencer Schell, Sarah L. Shafer, David B. Smith, Lisa L. Stillings, Michele L. Tuttle, Anna B. Wilson
U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2008 Annual Report U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2008 Annual Report
The Wyoming Landscape Conservation Initiative (WLCI) was launched in 2007 in response to concerns about threats to the State's world class wildlife resources, especially the threat posed by rapidly increasing energy development in southwest Wyoming. The overriding purpose of the WLCI is to assess and enhance aquatic and terrestrial habitats at a landscape scale, while facilitating...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Lori Anne Baer, R. Sky Bristol, Natasha B. Carr, Geneva W. Chong, Jay E. Diffendorfer, Bradley C. Fedy, Steven L. Garman, Steve Germaine, Richard I. Grauch, Collin G. Homer, Daniel J. Manier, Matthew J. Kauffman, Natalie Latysh, Cynthia P. Melcher, Kirk A. Miller, Jessica Montag, Constance J. Nutt, Christopher Potter, Hall Sawyer, David B. Smith, Michael J. Sweat, Anna B. Wilson
Relation between Streamflow of Swiftcurrent Creek, Montana, and the Geometry of Passage for Bull Trout (Salvelinus confluentus) Relation between Streamflow of Swiftcurrent Creek, Montana, and the Geometry of Passage for Bull Trout (Salvelinus confluentus)
Operation of Sherburne Dam in northcentral Montana has typically reduced winter streamflow in Swiftcurrent Creek downstream of the dam and resulted in passage limitations for bull trout (Salvelinus confluentus). We defined an empirical relation between discharge in Swiftcurrent Creek between Sherburne Dam and the downstream confluence with Boulder Creek and fish passage geometry by...
Authors
Gregor T. Auble, Christopher L. Holmquist-Johnson, Jim T. Mogen, Lynn R. Kaeding, Zachary H. Bowen
U.S. Geological Survey Science Strategy for the Wyoming Landscape Conservation Initiative U.S. Geological Survey Science Strategy for the Wyoming Landscape Conservation Initiative
Southwest Wyoming's wildlife and habitat resources are increasingly affected by energy and urban/exurban development, climate change, and other key drivers of ecosystem change. To ensure that southwest Wyoming's wildlife populations and habitats persist in the face of development and other changes, a consortium of public resource-management agencies proposed the Wyoming Landscape...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Geneva W. Chong, Mark A. Drummond, Collin G. Homer, Ronald C. Johnson, Matthew J. Kauffman, Steven T. Knick, John J. Kosovich, Kirk A. Miller, Tom Owens, Sarah L. Shafer, Michael J. Sweat
Fort Collins Science Center Ecosystem Dynamics Branch Fort Collins Science Center Ecosystem Dynamics Branch
Complex natural resource issues require understanding a web of interactions among ecosystem components that are (1) interdisciplinary, encompassing physical, chemical, and biological processes; (2) spatially complex, involving movements of animals, water, and airborne materials across a range of landscapes and jurisdictions; and (3) temporally complex, occurring over days, weeks, or...
Authors
Jim Wilson, C. Melcher, Z. Bowen
Channel Change in 2007 at Selected Sites on the Marias River, Montana, Following a 2006 High-Flow Release from Tiber Dam Channel Change in 2007 at Selected Sites on the Marias River, Montana, Following a 2006 High-Flow Release from Tiber Dam
In June 2006, an opportunistic high-flow release was made from Tiber Dam on the Marias River in Montana to investigate possible alternatives for partially restoring the river's natural flow pattern and variability. At two sites along the river, we measured channel geometry in 2006 before and after the high-flow release to evaluate channel change and alteration of physical habitat. Here...
Authors
Gregor T. Auble, Zachary H. Bowen
Multiscale sagebrush rangeland habitat modeling in southwest Wyoming Multiscale sagebrush rangeland habitat modeling in southwest Wyoming
Sagebrush-steppe ecosystems in North America have experienced dramatic elimination and degradation since European settlement. As a result, sagebrush-steppe dependent species have experienced drastic range contractions and population declines. Coordinated ecosystem-wide research, integrated with monitoring and management activities, would improve the ability to maintain existing sagebrush...
Authors
Collin G. Homer, Cameron L. Aldridge, Debra K. Meyer, Michael J. Coan, Zachary H. Bowen
A Regional Approach to Wildlife Monitoring Related to Energy Exploration and Development in Colorado A Regional Approach to Wildlife Monitoring Related to Energy Exploration and Development in Colorado
The U.S. Bureau of Land Management (BLM) is currently developing a National Monitoring Strategy that will guide efforts to create an efficient and effective process for monitoring land health by BLM. To inform the ongoing development of the national strategy, BLM selected two States (Colorado, Alaska) to serve as focal areas on which to base a flexible framework for developing monitoring...
Authors
Natasha B. Kotliar, Zachary H. Bowen, Douglas S. Ouren, Adrian H. Farmer
An aerial-photographic assessment of reenacted handcart treks on a section of the Mormon Pioneer National Historic Trail, Fremont County, Wyoming An aerial-photographic assessment of reenacted handcart treks on a section of the Mormon Pioneer National Historic Trail, Fremont County, Wyoming
Reenactments of historical pioneer emigrations have increased in popularity since the celebration of these events during the United States bicentennial in 1976. From 1999 to 2006, approximately 70,000 Mormon trekkers traveled the Mormon Pioneer National Historic Trail (hereinafter referred to as the Trail) segment between Sixth Crossing and Rock Creek Hollow in Fremont County, Wyoming...
Authors
Robert R. McDougal, Robert G. Waltermire, Cameron L. Aldridge, Stephen S. Germaine, Scott E. Nielsen, Charlene C. Nielsen, Leanne Hanson, Zachary H. Bowen
Range-wide patterns of greater sage-grouse persistence Range-wide patterns of greater sage-grouse persistence
Aim: Greater sage-grouse (Centrocercus urophasianus), a shrub-steppe obligate species of western North America, currently occupies only half its historical range. Here we examine how broad-scale, long-term trends in landscape condition have affected range contraction. Location: Sagebrush biome of the western USA. Methods: Logistic regression was used to assess persistence and extirpation...
Authors
Cameron L. Aldridge, Scott E. Nielsen, Hawthorne L. Beyer, Mark S. Boyce, John W. Connelly, Steven T. Knick, Michael A. Schroeder
Effects of a 2006 High-Flow Release from Tiber Dam on Channel Morphology at Selected Sites on the Marias River, Montana Effects of a 2006 High-Flow Release from Tiber Dam on Channel Morphology at Selected Sites on the Marias River, Montana
In June 2006, an opportunistic high-flow release was made from Tiber Dam on the Marias River in Mont., to investigate possible alternatives for partially restoring the river's natural flow pattern and variability. At two sites along the river, we measured channel geometry before and after the high-flow release to evaluate channel change and alteration of physical habitat. Streamflow...
Authors
Gregor T. Auble, Zachary H. Bowen
Science and Products
Filter Total Items: 16
Filter Total Items: 63
Sampling effort and estimates of species richness based on prepositioned area electrofisher samples Sampling effort and estimates of species richness based on prepositioned area electrofisher samples
Estimates of species richness based on electrofishing data are commonly used to describe the structure of fish communities. One electrofishing method for sampling riverine fishes that has become popular in the last decade is the prepositioned area electrofisher (PAE). We investigated the relationship between sampling effort and fish species richness at seven sites in the Tallapoosa River...
Authors
Zachary H. Bowen, Mary C. Freeman
U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative-2009 Annual Report U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative-2009 Annual Report
This is the second report produced by the U.S. Geological Survey (USGS) for the Wyoming Landscape Conservation Initiative (WLCI) to detail annual work activities. The first report described work activities for 2007 and 2008; this report covers work activities conducted in 2009. Important differences between the two reports are that (1) this report does not lump all the Effectiveness...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Laura R. H. Biewick, Steven W. Blecker, R. Sky Bristol, Natasha B. Carr, Anna D. Chalfoun, Geneva W. Chong, James E. Diffendorfer, Bradley C. Fedy, Steven L. Garman, Stephen S. Germaine, Richard I. Grauch, JoAnn M. Holloway, Collin G. Homer, Matthew Kauffman, Douglas Keinath, Natalie Latysh, Daniel J. Manier, Robert R. McDougal, Cynthia P. Melcher, Kirk A. Miller, Jessica Montag, Constance J. Nutt, Christopher J. Potter, Hall Sawyer, Spencer Schell, Sarah L. Shafer, David B. Smith, Lisa L. Stillings, Michele L. Tuttle, Anna B. Wilson
U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2008 Annual Report U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2008 Annual Report
The Wyoming Landscape Conservation Initiative (WLCI) was launched in 2007 in response to concerns about threats to the State's world class wildlife resources, especially the threat posed by rapidly increasing energy development in southwest Wyoming. The overriding purpose of the WLCI is to assess and enhance aquatic and terrestrial habitats at a landscape scale, while facilitating...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Lori Anne Baer, R. Sky Bristol, Natasha B. Carr, Geneva W. Chong, Jay E. Diffendorfer, Bradley C. Fedy, Steven L. Garman, Steve Germaine, Richard I. Grauch, Collin G. Homer, Daniel J. Manier, Matthew J. Kauffman, Natalie Latysh, Cynthia P. Melcher, Kirk A. Miller, Jessica Montag, Constance J. Nutt, Christopher Potter, Hall Sawyer, David B. Smith, Michael J. Sweat, Anna B. Wilson
Relation between Streamflow of Swiftcurrent Creek, Montana, and the Geometry of Passage for Bull Trout (Salvelinus confluentus) Relation between Streamflow of Swiftcurrent Creek, Montana, and the Geometry of Passage for Bull Trout (Salvelinus confluentus)
Operation of Sherburne Dam in northcentral Montana has typically reduced winter streamflow in Swiftcurrent Creek downstream of the dam and resulted in passage limitations for bull trout (Salvelinus confluentus). We defined an empirical relation between discharge in Swiftcurrent Creek between Sherburne Dam and the downstream confluence with Boulder Creek and fish passage geometry by...
Authors
Gregor T. Auble, Christopher L. Holmquist-Johnson, Jim T. Mogen, Lynn R. Kaeding, Zachary H. Bowen
U.S. Geological Survey Science Strategy for the Wyoming Landscape Conservation Initiative U.S. Geological Survey Science Strategy for the Wyoming Landscape Conservation Initiative
Southwest Wyoming's wildlife and habitat resources are increasingly affected by energy and urban/exurban development, climate change, and other key drivers of ecosystem change. To ensure that southwest Wyoming's wildlife populations and habitats persist in the face of development and other changes, a consortium of public resource-management agencies proposed the Wyoming Landscape...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Geneva W. Chong, Mark A. Drummond, Collin G. Homer, Ronald C. Johnson, Matthew J. Kauffman, Steven T. Knick, John J. Kosovich, Kirk A. Miller, Tom Owens, Sarah L. Shafer, Michael J. Sweat
Fort Collins Science Center Ecosystem Dynamics Branch Fort Collins Science Center Ecosystem Dynamics Branch
Complex natural resource issues require understanding a web of interactions among ecosystem components that are (1) interdisciplinary, encompassing physical, chemical, and biological processes; (2) spatially complex, involving movements of animals, water, and airborne materials across a range of landscapes and jurisdictions; and (3) temporally complex, occurring over days, weeks, or...
Authors
Jim Wilson, C. Melcher, Z. Bowen
Channel Change in 2007 at Selected Sites on the Marias River, Montana, Following a 2006 High-Flow Release from Tiber Dam Channel Change in 2007 at Selected Sites on the Marias River, Montana, Following a 2006 High-Flow Release from Tiber Dam
In June 2006, an opportunistic high-flow release was made from Tiber Dam on the Marias River in Montana to investigate possible alternatives for partially restoring the river's natural flow pattern and variability. At two sites along the river, we measured channel geometry in 2006 before and after the high-flow release to evaluate channel change and alteration of physical habitat. Here...
Authors
Gregor T. Auble, Zachary H. Bowen
Multiscale sagebrush rangeland habitat modeling in southwest Wyoming Multiscale sagebrush rangeland habitat modeling in southwest Wyoming
Sagebrush-steppe ecosystems in North America have experienced dramatic elimination and degradation since European settlement. As a result, sagebrush-steppe dependent species have experienced drastic range contractions and population declines. Coordinated ecosystem-wide research, integrated with monitoring and management activities, would improve the ability to maintain existing sagebrush...
Authors
Collin G. Homer, Cameron L. Aldridge, Debra K. Meyer, Michael J. Coan, Zachary H. Bowen
A Regional Approach to Wildlife Monitoring Related to Energy Exploration and Development in Colorado A Regional Approach to Wildlife Monitoring Related to Energy Exploration and Development in Colorado
The U.S. Bureau of Land Management (BLM) is currently developing a National Monitoring Strategy that will guide efforts to create an efficient and effective process for monitoring land health by BLM. To inform the ongoing development of the national strategy, BLM selected two States (Colorado, Alaska) to serve as focal areas on which to base a flexible framework for developing monitoring...
Authors
Natasha B. Kotliar, Zachary H. Bowen, Douglas S. Ouren, Adrian H. Farmer
An aerial-photographic assessment of reenacted handcart treks on a section of the Mormon Pioneer National Historic Trail, Fremont County, Wyoming An aerial-photographic assessment of reenacted handcart treks on a section of the Mormon Pioneer National Historic Trail, Fremont County, Wyoming
Reenactments of historical pioneer emigrations have increased in popularity since the celebration of these events during the United States bicentennial in 1976. From 1999 to 2006, approximately 70,000 Mormon trekkers traveled the Mormon Pioneer National Historic Trail (hereinafter referred to as the Trail) segment between Sixth Crossing and Rock Creek Hollow in Fremont County, Wyoming...
Authors
Robert R. McDougal, Robert G. Waltermire, Cameron L. Aldridge, Stephen S. Germaine, Scott E. Nielsen, Charlene C. Nielsen, Leanne Hanson, Zachary H. Bowen
Range-wide patterns of greater sage-grouse persistence Range-wide patterns of greater sage-grouse persistence
Aim: Greater sage-grouse (Centrocercus urophasianus), a shrub-steppe obligate species of western North America, currently occupies only half its historical range. Here we examine how broad-scale, long-term trends in landscape condition have affected range contraction. Location: Sagebrush biome of the western USA. Methods: Logistic regression was used to assess persistence and extirpation...
Authors
Cameron L. Aldridge, Scott E. Nielsen, Hawthorne L. Beyer, Mark S. Boyce, John W. Connelly, Steven T. Knick, Michael A. Schroeder
Effects of a 2006 High-Flow Release from Tiber Dam on Channel Morphology at Selected Sites on the Marias River, Montana Effects of a 2006 High-Flow Release from Tiber Dam on Channel Morphology at Selected Sites on the Marias River, Montana
In June 2006, an opportunistic high-flow release was made from Tiber Dam on the Marias River in Mont., to investigate possible alternatives for partially restoring the river's natural flow pattern and variability. At two sites along the river, we measured channel geometry before and after the high-flow release to evaluate channel change and alteration of physical habitat. Streamflow...
Authors
Gregor T. Auble, Zachary H. Bowen