Patrick Shafroth, PhD
Patrick B. Shafroth is a Scientist Emeritus at the Arizona Water Science Center.
Since 1991, Dr. Shafroth has conducted research on river and riparian systems, primarily in arid and semi-arid regions of western U.S. He and his colleagues from the USGS and other institutions have focused their work on understanding relationships between surface and ground-water hydrology, fluvial processes, and the dynamics of native and introduced riparian vegetation. This research has often had strong application to resource management (particularly DOI sister agencies), by providing solid, objective scientific information to inform riparian management and restoration. Specific applications have included studies of large-scale flow experiments, dam removal, effects of invasive species control, system responses to various restoration actions, vegetation responses to drought, and system responses to high intensity wildfires.
Education and Certifications
Ph.D. in Plant Biology, Arizona State University, 1999
M.S. in Forest Ecology, Colorado State University, 1993
B.A. in Environmental Studies and Geography, University of California, Santa Barbara, 1989
Science and Products
Filter Total Items: 131
Dominance of non-native riparian trees in western USA Dominance of non-native riparian trees in western USA
Concern about spread of non-native riparian trees in the western USA has led to Congressional proposals to accelerate control efforts. Debate over these proposals is frustrated by limited knowledge of non-native species distribution and abundance. We measured abundance of 44 riparian woody plants at 475 randomly selected stream gaging stations in 17 western states. Our sample indicates...
Authors
Jonathan M. Friedman, G.T. Auble, P.B. Shafroth, M. L. Scott, M.F. Merigliano, M.D. Freehling, E.R. Griffin
Dating floodplain sediments using tree-ring response to burial Dating floodplain sediments using tree-ring response to burial
Floodplain sediments can be dated precisely based on the change in anatomy of tree rings upon burial. When a stem of tamarisk (Tamarix ramosissima) or sandbar willow (Salix exigua) is buried, subsequent annual rings in the buried section resemble the rings of roots: rings become narrower, vessels within the rings become larger, and transitions between rings become less distinct. We...
Authors
Jonathan M. Friedman, K.R. Vincent, P.B. Shafroth
Control of Tamarix in the western United States: Implications for water salvage, wildlife use, and riparian restoration Control of Tamarix in the western United States: Implications for water salvage, wildlife use, and riparian restoration
Non-native shrub species in the genus Tamarix (saltcedar, tamarisk) have colonized hundreds of thousands of hectares of floodplains, reservoir margins, and other wetlands in western North America. Many resource managers seek to reduce saltcedar abundance and control its spread to increase the flow of water in streams that might otherwise be lost to evapotranspiration, to restore native...
Authors
P.B. Shafroth, J.R. Cleverly, T.L. Dudley, J.P. Taylor, Charles van Riper, E.P. Weeks, J.N. Stuart
Tamarisk tensions Tamarisk tensions
In the August 2005 feature article, “Tiff over Tamarisk: Can a Nuisance Be Nice, Too?” the author raises several issues about which there is currently scientific debate, and presents some of the differing perspectives. A phenomenon surrounding discussions of tamarisk in the West is revealed and reinforced in the article—the polarized nature of the debate. Over the years, this...
Authors
Patrick B. Shafroth
Human alterations of riparian ecosystems Human alterations of riparian ecosystems
No abstract available.
Authors
J. Stromberg, M. Briggs, C. Gourley, M. Scott, P. Shafroth, L. Stevens
Riparian ecosystem assessments Riparian ecosystem assessments
No abstract available.
Authors
J. Stromberg, M. Briggs, M. Scott, P. Shafroth
Vegetation responses to dam removal Vegetation responses to dam removal
No abstract available.
Authors
Patrick B. Shafroth, Jonathan M. Friedman, Gregor T. Auble, Michael L. Scott
Natural flooding and dams: Effects on riparian systems Natural flooding and dams: Effects on riparian systems
No abstract available.
Authors
P. Shafroth
Biology, ecology and management of Elaeagnus angustifolia L. (Russian olive) in western North America Biology, ecology and management of Elaeagnus angustifolia L. (Russian olive) in western North America
Elaeagnus angustifolia (Russian olive) is an alien tree that is increasingly common in riparian habitats of western North America. This paper reviews the pertinent scientific literature in order to determine the status of E. angustifolia as a riparian invader and to suggest ecological reasons for its success. Elaeagnus angustifolia meets the biogeographic, spread, and impact criteria for...
Authors
G.L. Katz, P.B. Shafroth
Riparian vegetation response to altered disturbance and stress regimes Riparian vegetation response to altered disturbance and stress regimes
Management of terrestrial carbon fluxes is being proposed as a means of increasing the amount of carbon sequestered in the terrestrial biosphere. This approach is generally viewed only as an interim strategy for the coming decades while other longer-term strategies are developed and implemented — the most important being the direct reduction of carbon emissions. We are concerned that the...
Authors
P.B. Shafroth, J.C. Stromberg, D.T. Patten
Potential responses of riparian vegetation to dam removal Potential responses of riparian vegetation to dam removal
Throughout the world, riparian habitats have been dramatically modified from their natural condition. Dams are one of the principal causes of these changes, because of their alteration of water and sediment regimes (Nilsson and Berggren 2000). Because of the array of ecological goods and services provided by natural riparian ecosystems (Naiman and Decamps 1997), their conservation and...
Authors
P.B. Shafroth, Jonathan M. Friedman, G.T. Auble, M. L. Scott, J.H. Braatne
Woody riparian vegetation response to different alluvial water table regimes Woody riparian vegetation response to different alluvial water table regimes
Woody riparian vegetation in western North American riparian ecosystems is commonly dependent on alluvial groundwater. Various natural and anthropogenic mechanisms can cause groundwater declines that stress riparian vegetation, but little quantitative information exists on the nature of plant response to different magnitudes, rates, and durations of groundwater decline. We observed...
Authors
P.B. Shafroth, J.C. Stromberg, D.T. Patten
Non-USGS Publications**
Shafroth, P.B., J.C. Stromberg, D.T. Patten, A.E. Springer, and J.M. Wright. 1996. Ground-water recharge and riparian habitat enhancement from water discharged from New Waddell Dam into the Agua Fria River: Phase I--Planning and feasibility. Final Report to Arizona Dept. of Water Resources - Phoenix Active Management Area. Phoenix, AZ78+ap p.
Shafroth, P.B., J.M. Friedman, and L.S. Ischinger. 1994. River salinity has little influence on establishment of cottonwood and saltcedar. Research Information Bulletin 94-95. NBS Information Bulletin.
**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.
Filter Total Items: 13
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Science and Products
Filter Total Items: 131
Dominance of non-native riparian trees in western USA Dominance of non-native riparian trees in western USA
Concern about spread of non-native riparian trees in the western USA has led to Congressional proposals to accelerate control efforts. Debate over these proposals is frustrated by limited knowledge of non-native species distribution and abundance. We measured abundance of 44 riparian woody plants at 475 randomly selected stream gaging stations in 17 western states. Our sample indicates...
Authors
Jonathan M. Friedman, G.T. Auble, P.B. Shafroth, M. L. Scott, M.F. Merigliano, M.D. Freehling, E.R. Griffin
Dating floodplain sediments using tree-ring response to burial Dating floodplain sediments using tree-ring response to burial
Floodplain sediments can be dated precisely based on the change in anatomy of tree rings upon burial. When a stem of tamarisk (Tamarix ramosissima) or sandbar willow (Salix exigua) is buried, subsequent annual rings in the buried section resemble the rings of roots: rings become narrower, vessels within the rings become larger, and transitions between rings become less distinct. We...
Authors
Jonathan M. Friedman, K.R. Vincent, P.B. Shafroth
Control of Tamarix in the western United States: Implications for water salvage, wildlife use, and riparian restoration Control of Tamarix in the western United States: Implications for water salvage, wildlife use, and riparian restoration
Non-native shrub species in the genus Tamarix (saltcedar, tamarisk) have colonized hundreds of thousands of hectares of floodplains, reservoir margins, and other wetlands in western North America. Many resource managers seek to reduce saltcedar abundance and control its spread to increase the flow of water in streams that might otherwise be lost to evapotranspiration, to restore native...
Authors
P.B. Shafroth, J.R. Cleverly, T.L. Dudley, J.P. Taylor, Charles van Riper, E.P. Weeks, J.N. Stuart
Tamarisk tensions Tamarisk tensions
In the August 2005 feature article, “Tiff over Tamarisk: Can a Nuisance Be Nice, Too?” the author raises several issues about which there is currently scientific debate, and presents some of the differing perspectives. A phenomenon surrounding discussions of tamarisk in the West is revealed and reinforced in the article—the polarized nature of the debate. Over the years, this...
Authors
Patrick B. Shafroth
Human alterations of riparian ecosystems Human alterations of riparian ecosystems
No abstract available.
Authors
J. Stromberg, M. Briggs, C. Gourley, M. Scott, P. Shafroth, L. Stevens
Riparian ecosystem assessments Riparian ecosystem assessments
No abstract available.
Authors
J. Stromberg, M. Briggs, M. Scott, P. Shafroth
Vegetation responses to dam removal Vegetation responses to dam removal
No abstract available.
Authors
Patrick B. Shafroth, Jonathan M. Friedman, Gregor T. Auble, Michael L. Scott
Natural flooding and dams: Effects on riparian systems Natural flooding and dams: Effects on riparian systems
No abstract available.
Authors
P. Shafroth
Biology, ecology and management of Elaeagnus angustifolia L. (Russian olive) in western North America Biology, ecology and management of Elaeagnus angustifolia L. (Russian olive) in western North America
Elaeagnus angustifolia (Russian olive) is an alien tree that is increasingly common in riparian habitats of western North America. This paper reviews the pertinent scientific literature in order to determine the status of E. angustifolia as a riparian invader and to suggest ecological reasons for its success. Elaeagnus angustifolia meets the biogeographic, spread, and impact criteria for...
Authors
G.L. Katz, P.B. Shafroth
Riparian vegetation response to altered disturbance and stress regimes Riparian vegetation response to altered disturbance and stress regimes
Management of terrestrial carbon fluxes is being proposed as a means of increasing the amount of carbon sequestered in the terrestrial biosphere. This approach is generally viewed only as an interim strategy for the coming decades while other longer-term strategies are developed and implemented — the most important being the direct reduction of carbon emissions. We are concerned that the...
Authors
P.B. Shafroth, J.C. Stromberg, D.T. Patten
Potential responses of riparian vegetation to dam removal Potential responses of riparian vegetation to dam removal
Throughout the world, riparian habitats have been dramatically modified from their natural condition. Dams are one of the principal causes of these changes, because of their alteration of water and sediment regimes (Nilsson and Berggren 2000). Because of the array of ecological goods and services provided by natural riparian ecosystems (Naiman and Decamps 1997), their conservation and...
Authors
P.B. Shafroth, Jonathan M. Friedman, G.T. Auble, M. L. Scott, J.H. Braatne
Woody riparian vegetation response to different alluvial water table regimes Woody riparian vegetation response to different alluvial water table regimes
Woody riparian vegetation in western North American riparian ecosystems is commonly dependent on alluvial groundwater. Various natural and anthropogenic mechanisms can cause groundwater declines that stress riparian vegetation, but little quantitative information exists on the nature of plant response to different magnitudes, rates, and durations of groundwater decline. We observed...
Authors
P.B. Shafroth, J.C. Stromberg, D.T. Patten
Non-USGS Publications**
Shafroth, P.B., J.C. Stromberg, D.T. Patten, A.E. Springer, and J.M. Wright. 1996. Ground-water recharge and riparian habitat enhancement from water discharged from New Waddell Dam into the Agua Fria River: Phase I--Planning and feasibility. Final Report to Arizona Dept. of Water Resources - Phoenix Active Management Area. Phoenix, AZ78+ap p.
Shafroth, P.B., J.M. Friedman, and L.S. Ischinger. 1994. River salinity has little influence on establishment of cottonwood and saltcedar. Research Information Bulletin 94-95. NBS Information Bulletin.
**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.
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