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
Assessing the extent and diversity of riparian ecosystems in Sonora, Mexico Assessing the extent and diversity of riparian ecosystems in Sonora, Mexico
Conservation of forested riparian ecosystems is of international concern. Relatively little is known of the structure, composition, diversity, and extent of riparian ecosystems in Mexico. We used high- and low-resolution satellite imagery from 2000 to 2006, and ground-based sampling in 2006, to assess the spatial pattern, extent, and woody plant composition of riparian forests across a...
Authors
M. L. Scott, P.L. Nagler, E. P. Glenn, C. Valdes-Casillas, J.A. Erker, E.W. Reynolds, P.B. Shafroth, E. Gomez-Limon, C.L. Jones
Salinity tolerance and mycorrhizal responsiveness of native xeroriparian plants in semi-arid western USA Salinity tolerance and mycorrhizal responsiveness of native xeroriparian plants in semi-arid western USA
Restoration of salt-affected soils is a global concern. In the western United States, restoration of salinized land, particularly in river valleys, often involves control of Tamarix, an introduced species with high salinity tolerance. Revegetation of hydrologically disconnected floodplains and terraces after Tamarix removal is often difficult because of limited knowledge regarding the...
Authors
Vanessa B. Beauchamp, C. Walz, P.B. Shafroth
Planning riparian restoration in the context of tamarix control in Western North America Planning riparian restoration in the context of tamarix control in Western North America
Throughout the world, the condition of many riparian ecosystems has declined due to numerous factors, including encroachment of non-native species. In the western United States, millions of dollars are spent annually to control invasions of Tamarix spp., introduced small trees or shrubs from Eurasia that have colonized bottomland ecosystems along many rivers. Resource managers seek to...
Authors
P.B. Shafroth, Vanessa B. Beauchamp, M.K. Briggs, K. Lair, M. L. Scott, A.A. Sher
Restoration ecology and invasive riparian plants: An introduction to the special section on Tamarix spp. in western North America Restoration ecology and invasive riparian plants: An introduction to the special section on Tamarix spp. in western North America
River systems around the world are subject to various perturbations, including the colonization and spread of non-native species in riparian zones. Riparian resource managers are commonly engaged in efforts to control problematic non-native species and restore native habitats. In western North America, small Eurasian trees or shrubs in the genus Tamarixoccupy hundreds of thousands of...
Authors
Patrick B. Shafroth, Mark K. Briggs
Effects of a natural dam-break flood on geomorphology and vegetation on the Elwha River, Washington, U.S.A. Effects of a natural dam-break flood on geomorphology and vegetation on the Elwha River, Washington, U.S.A.
Ephemeral dams caused by landslides have been observed around the world, yet little is known about the effects of their failure on landforms and vegetation. In 1967, a landslide-dam-break flood in a pristine reach of the Elwha River valley filled the former channel and diverted the river. The reach is a reference site for restoration following the planned removal of dams on the river. We
Authors
S.A. Acker, T.J. Beechie, P.B. Shafroth
Rethinking avian response to Tamarix on the lower Colorado River: A threshold hypothesis Rethinking avian response to Tamarix on the lower Colorado River: A threshold hypothesis
Many of the world's large river systems have been greatly altered in the past century due to river regulation, agriculture, and invasion of introduced Tamarix spp. (saltcedar, tamarisk). These riverine ecosystems are known to provide important habitat for avian communities, but information on responses of birds to differing levels of Tamarix is not known. Past research on birds along the...
Authors
Charles van Riper, K.L. Paxton, C. O'brien, P.B. Shafroth, L.J. McGrath
Early vegetation development on an exposed reservoir: Implications for dam removal Early vegetation development on an exposed reservoir: Implications for dam removal
The 4-year drawdown of Horsetooth Reservoir, Colorado, for dam maintenance, provides a case study analog of vegetation response on sediment that might be exposed from removal of a tall dam. Early vegetation recovery on the exposed reservoir bottom was a combination of (1) vegetation colonization on bare, moist substrates typical of riparian zones and reservoir sediment of shallow dams...
Authors
G.T. Auble, P.B. Shafroth, M. L. Scott, J. E. Roelle
Altered stream-flow regimes and invasive plant species: The Tamarix case Altered stream-flow regimes and invasive plant species: The Tamarix case
Aim: To test the hypothesis that anthropogenic alteration of stream-flow regimes is a key driver of compositional shifts from native to introduced riparian plant species. Location: The arid south-western United States; 24 river reaches in the Gila and Lower Colorado drainage basins of Arizona. Methods: We compared the abundance of three dominant woody riparian taxa (native Populus...
Authors
J.C. Stromberg, S.J. Lite, R. Marler, C. Paradzick, P.B. Shafroth, D. Shorrock, J. M. White, M.S. White
Tamarisk research priorities of land and water managers: results from a USGS partnership meeting Tamarisk research priorities of land and water managers: results from a USGS partnership meeting
No abstract available.
Authors
L. Hanson, P.B. Shafroth, F. D’Erchia
Tamarisk control, water salvage, and wildlife habitat restoration along rivers in the western United States Tamarisk control, water salvage, and wildlife habitat restoration along rivers in the western United States
In the latter part of the 19th century, species of the nonnative shrub tamarisk (also called saltcedar; for example, Tamarix ramosissima, T. chinensis) were introduced to the United States for use as ornamental plants for erosion control. By 1877, some naturalized populations had become established, and by the 1960s, tamarisk was present along most rivers in the semi-arid and arid parts...
Authors
Patrick B. Shafroth
Defining ecosystem flow requirements for the Bill Williams River, Arizona Defining ecosystem flow requirements for the Bill Williams River, Arizona
Alteration of natural river flows resulting from the construction and operation of dams can result in substantial changes to downstream aquatic and bottomland ecosystems and undermine the long-term health of native species and communities (for general review, cf. Ward and Stanford, 1995; Baron and others, 2002; Nilsson and Svedmark, 2002). Increasingly, land and water managers are...
Hybridization of Tamarix ramosissima and T. chinensis (saltcedars) with T. aphylla (athel) (tamaricaceae) in the southwestern USA dertermined from DNA sequence data Hybridization of Tamarix ramosissima and T. chinensis (saltcedars) with T. aphylla (athel) (tamaricaceae) in the southwestern USA dertermined from DNA sequence data
Morphological intermediates between Tamarix ramosissima or T. chinensis (saltcedars) and T. aphylla (athel) were found recently in three locations in the southwestern USA, and were assumed to be hybrids or a previously unreported species. We sequenced chloroplast and nuclear DNA from putative parental and hybrid morphotypes and hybrid status of morphological intermediates was supported
Authors
John F. Gaskin, Patrick B. Shafroth
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
Assessing the extent and diversity of riparian ecosystems in Sonora, Mexico Assessing the extent and diversity of riparian ecosystems in Sonora, Mexico
Conservation of forested riparian ecosystems is of international concern. Relatively little is known of the structure, composition, diversity, and extent of riparian ecosystems in Mexico. We used high- and low-resolution satellite imagery from 2000 to 2006, and ground-based sampling in 2006, to assess the spatial pattern, extent, and woody plant composition of riparian forests across a...
Authors
M. L. Scott, P.L. Nagler, E. P. Glenn, C. Valdes-Casillas, J.A. Erker, E.W. Reynolds, P.B. Shafroth, E. Gomez-Limon, C.L. Jones
Salinity tolerance and mycorrhizal responsiveness of native xeroriparian plants in semi-arid western USA Salinity tolerance and mycorrhizal responsiveness of native xeroriparian plants in semi-arid western USA
Restoration of salt-affected soils is a global concern. In the western United States, restoration of salinized land, particularly in river valleys, often involves control of Tamarix, an introduced species with high salinity tolerance. Revegetation of hydrologically disconnected floodplains and terraces after Tamarix removal is often difficult because of limited knowledge regarding the...
Authors
Vanessa B. Beauchamp, C. Walz, P.B. Shafroth
Planning riparian restoration in the context of tamarix control in Western North America Planning riparian restoration in the context of tamarix control in Western North America
Throughout the world, the condition of many riparian ecosystems has declined due to numerous factors, including encroachment of non-native species. In the western United States, millions of dollars are spent annually to control invasions of Tamarix spp., introduced small trees or shrubs from Eurasia that have colonized bottomland ecosystems along many rivers. Resource managers seek to...
Authors
P.B. Shafroth, Vanessa B. Beauchamp, M.K. Briggs, K. Lair, M. L. Scott, A.A. Sher
Restoration ecology and invasive riparian plants: An introduction to the special section on Tamarix spp. in western North America Restoration ecology and invasive riparian plants: An introduction to the special section on Tamarix spp. in western North America
River systems around the world are subject to various perturbations, including the colonization and spread of non-native species in riparian zones. Riparian resource managers are commonly engaged in efforts to control problematic non-native species and restore native habitats. In western North America, small Eurasian trees or shrubs in the genus Tamarixoccupy hundreds of thousands of...
Authors
Patrick B. Shafroth, Mark K. Briggs
Effects of a natural dam-break flood on geomorphology and vegetation on the Elwha River, Washington, U.S.A. Effects of a natural dam-break flood on geomorphology and vegetation on the Elwha River, Washington, U.S.A.
Ephemeral dams caused by landslides have been observed around the world, yet little is known about the effects of their failure on landforms and vegetation. In 1967, a landslide-dam-break flood in a pristine reach of the Elwha River valley filled the former channel and diverted the river. The reach is a reference site for restoration following the planned removal of dams on the river. We
Authors
S.A. Acker, T.J. Beechie, P.B. Shafroth
Rethinking avian response to Tamarix on the lower Colorado River: A threshold hypothesis Rethinking avian response to Tamarix on the lower Colorado River: A threshold hypothesis
Many of the world's large river systems have been greatly altered in the past century due to river regulation, agriculture, and invasion of introduced Tamarix spp. (saltcedar, tamarisk). These riverine ecosystems are known to provide important habitat for avian communities, but information on responses of birds to differing levels of Tamarix is not known. Past research on birds along the...
Authors
Charles van Riper, K.L. Paxton, C. O'brien, P.B. Shafroth, L.J. McGrath
Early vegetation development on an exposed reservoir: Implications for dam removal Early vegetation development on an exposed reservoir: Implications for dam removal
The 4-year drawdown of Horsetooth Reservoir, Colorado, for dam maintenance, provides a case study analog of vegetation response on sediment that might be exposed from removal of a tall dam. Early vegetation recovery on the exposed reservoir bottom was a combination of (1) vegetation colonization on bare, moist substrates typical of riparian zones and reservoir sediment of shallow dams...
Authors
G.T. Auble, P.B. Shafroth, M. L. Scott, J. E. Roelle
Altered stream-flow regimes and invasive plant species: The Tamarix case Altered stream-flow regimes and invasive plant species: The Tamarix case
Aim: To test the hypothesis that anthropogenic alteration of stream-flow regimes is a key driver of compositional shifts from native to introduced riparian plant species. Location: The arid south-western United States; 24 river reaches in the Gila and Lower Colorado drainage basins of Arizona. Methods: We compared the abundance of three dominant woody riparian taxa (native Populus...
Authors
J.C. Stromberg, S.J. Lite, R. Marler, C. Paradzick, P.B. Shafroth, D. Shorrock, J. M. White, M.S. White
Tamarisk research priorities of land and water managers: results from a USGS partnership meeting Tamarisk research priorities of land and water managers: results from a USGS partnership meeting
No abstract available.
Authors
L. Hanson, P.B. Shafroth, F. D’Erchia
Tamarisk control, water salvage, and wildlife habitat restoration along rivers in the western United States Tamarisk control, water salvage, and wildlife habitat restoration along rivers in the western United States
In the latter part of the 19th century, species of the nonnative shrub tamarisk (also called saltcedar; for example, Tamarix ramosissima, T. chinensis) were introduced to the United States for use as ornamental plants for erosion control. By 1877, some naturalized populations had become established, and by the 1960s, tamarisk was present along most rivers in the semi-arid and arid parts...
Authors
Patrick B. Shafroth
Defining ecosystem flow requirements for the Bill Williams River, Arizona Defining ecosystem flow requirements for the Bill Williams River, Arizona
Alteration of natural river flows resulting from the construction and operation of dams can result in substantial changes to downstream aquatic and bottomland ecosystems and undermine the long-term health of native species and communities (for general review, cf. Ward and Stanford, 1995; Baron and others, 2002; Nilsson and Svedmark, 2002). Increasingly, land and water managers are...
Hybridization of Tamarix ramosissima and T. chinensis (saltcedars) with T. aphylla (athel) (tamaricaceae) in the southwestern USA dertermined from DNA sequence data Hybridization of Tamarix ramosissima and T. chinensis (saltcedars) with T. aphylla (athel) (tamaricaceae) in the southwestern USA dertermined from DNA sequence data
Morphological intermediates between Tamarix ramosissima or T. chinensis (saltcedars) and T. aphylla (athel) were found recently in three locations in the southwestern USA, and were assumed to be hybrids or a previously unreported species. We sequenced chloroplast and nuclear DNA from putative parental and hybrid morphotypes and hybrid status of morphological intermediates was supported
Authors
John F. Gaskin, Patrick B. Shafroth
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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