Patrick Shafroth, Ph.D.

Biography

Patrick B. Shafroth is a research ecologist with the U.S. Geological Survey, Fort Collins Science Center. Since 1991, Dr. Shafroth has conducted research on riparian ecosystems, 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 been conducted in the applied context of riparian ecosystem restoration with the goal of providing solid, objective scientific information that can be used to inform riparian restoration efforts. More specific restoration-related research areas include studies of large-scale flow experiments, dam removal, effects of invasive species control and associated restoration actions, and potential interactions with climate change.

Some of Dr. Shafroth’s current research includes studies of: vegetation and geomorphic responses to experimental flow releases downstream of dams on the Bill Williams River, Arizona; the Colorado River delta in Mexico and the U.S.; and the the Colorado River in Grand Canyon; vegetation and geomorphic responses to dam removal on the Elwha River, Washington, where the world's largest dam removals occurred recently; dynamics of non-native riparian plants along western rivers, including patterns of riparian vegetation recovery associated with biological control of Tamarix.

Education

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: 6

Location

Date published: December 3, 2016

Erosion and Invasive Saltcedar

Formation of arroyos in the late 1800s greatly increased erosion across the southwestern United States. Since the 1930s, however, this erosion has decreased, partly because of bank stabilization by introduced saltcedar. With Isleta Pueblo Indian Nation, the Aquatic Systems Branch developed a new sediment dating method using saltcedar tree rings. We applied the method in a landmark study of...

Contacts: Jonathan Friedman, Ph.D., Gregor Auble, Ph.D., Patrick Shafroth, Ph.D., Eleanor Griffin

Attribution: Ecosystems, Water Resources, Environments Program, Invasive Species Program, Water Availability and Use Science Program, Southwest, Fort Collins Science Center

Date published: November 29, 2016

Riparian Vegetation Response to Dam Removal

Dam removal is an approach to river restoration that is becoming increasingly common. In most cases, dam removal is driven by considerations other than river restoration like dam safety, but how dam removal affects aquatic and riparian systems is of great interest in many dam removals. My work in this area has had two areas of focus thus far: 1) studies of vegetation and geomorphic change...

Contacts: Patrick Shafroth, Ph.D.

Attribution: Ecosystems, Coastal and Marine Geology, Environments Program, Northwest, Southwest, Fort Collins Science Center

Date published: November 29, 2016

Science to Inform Riparian Ecosystem Restoration and Management

Throughout the world, riparian habitats have been dramatically modified from their natural condition. Dams, non-native species and climate change are often principal drivers of these changes, via their alteration of water and sediment regimes that determine key resources for riparian plants.

Contacts: Patrick Shafroth, Ph.D.

Attribution: Ecosystems, Environments Program, Invasive Species Program, Southwest, Fort Collins Science Center

Date published: November 29, 2016

Large-scale streamflow experiments

Because the underlying cause of riparian system alteration is often attributed to the effects of dams on flow regime, managing flow releases, particularly high flows, from dams is an often-advocated approach to river and riparian restoration. Our work has focused on understanding effects of managed high flow releases (a.k.a., pulse flows, controlled floods) from dams along rivers in the lower...

Contacts: Patrick Shafroth, Ph.D.

Attribution: Ecosystems, Environments Program, Invasive Species Program, Southwest, Fort Collins Science Center

Date published: November 28, 2016

Biological Invasions of Riparian Ecosystems

Beginning in the early twentieth century, non-native trees and shrubs, including tamarisk (also commonly known as saltcedar) and Russian-olive, were introduced to the United States for use as ornamental plants and in erosion-control plantings. These plants spread extensively, becoming the third and fourth most frequently occurring woody riparian plants in the American West.

Contacts: Patrick Shafroth, Ph.D.

Attribution: Ecosystems, Environments Program, Invasive Species Program, Southwest, Fort Collins Science Center

Date published: November 28, 2016

Streamflow-fluvial Geomorphology-riparian Vegetation Interactions

The foundation for applying science to river and riparian restoration contexts lies in a basic understanding of the factors that drive riparian vegetation dynamics. Much of our research is focused on clarifying relationships between streamflow, fluvial geomorphology, and riparian vegetation, including various feedbacks.

Contacts: Patrick Shafroth, Ph.D.

Attribution: Ecosystems, Environments Program, Invasive Species Program, Southwest, Fort Collins Science Center

Pre-USGS Publications

Ground-water recharge and riparian habitat enhancement from water discharged from New Waddell Dam into the Agua Fria River: Phase I--Planning and feasibility

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.

River salinity has little influence on establishment of cottonwood and saltcedar. Research Information Bulletin 94-95

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.

Patrick Shafroth, Ph.D.

Biography

Erosion and Invasive Saltcedar

Riparian Vegetation Response to Dam Removal

Science to Inform Riparian Ecosystem Restoration and Management

Large-scale streamflow experiments

Biological Invasions of Riparian Ecosystems

Streamflow-fluvial Geomorphology-riparian Vegetation Interactions

Regeneration of Salicaceae riparian forests in the Northern Hemisphere: A new framework and management tool

Landscape-scale processes influence riparian plant composition along a regulated river

Riparian plant composition along hydrologic gradients in a dryland river basin and implications for a warming climate

Secondary invasions of noxious weeds associated with control of invasive Tamarix are frequent, idiosyncratic and persistent

Vegetation response to invasive Tamarix control in southwestern U.S. rivers: A collaborative study including 416 sites

A large-scale environmental flow experiment for riparian restoration in the Colorado River delta

Integrating active restoration with environmental flows to improve native riparian tree establishment in the Colorado River Delta

Dam removal: Listening in

It takes more than water: Restoring the Colorado River Delta

The long-term legacy of geomorphic and riparian vegetation feedbacks on the dammed Bill Williams River, Arizona, USA

Landscape context and the biophysical response of rivers to dam removal in the United States

Coastal habitat and biological community response to dam removal on the Elwha River

Pre-USGS Publications