Jonathan Friedman, PhD
Jonathan Friedman is a Hydrologist at the Fort Collins Science Center.
Since joining the Fort Collins Science Center in 1993, Jonathan has devoted his career to studying interactions among riparian vegetation, river flow and channel change. Present research topics include use of riparian tree rings to reconstruct past river flow, quantification of federal reserved water rights, and determination of the effect of riparian vegetation on bank stability.
Professional Experience
1993-present, Research Hydrologist, USGS Fort Collins Science Center, Fort Collins, CO
1990-1993, Hydrologist, USGS Water Resources Division, Lakewood, CO
1988-1990, Community College Instructor, Bellevue Community College, Olympic College and Front Range Community College, Washington and Colorado.
1988 Assistant Natural Area Scientist, Washington Natural Heritage Program, Olympia, Washington
Education and Certifications
Ph.D. Environmental, Population and Organismic Biology, University of Colorado, Boulder, 1993
M.S. Oceanography and Limnology, University of Wisconsin, Madison, 1987
B.S. Biology, Massachusetts Institute of Technology, 1983
Affiliations and Memberships*
Ecological Society of America
American Geophysical Union
Science and Products
Flood dependency of cottonwood establishment along the Missouri River, Montana, USA
Constraints on establishment of plains cottonwood in an urban riparian preserve
Water management and cottonwood forest dynamics along prairie streams
Channel narrowing and vegetation development following a great plains flood
Fluvial process and the establishment of bottomland trees
Historical perspectives on riparian ecosystems of Colorado
The role of vegetation and bed-level fluctuations in the process of channel narrowing
Effects of salinity on establishment of Populus fremontii (cottonwood) and Tamarix ramosissima (saltcedar) in southwestern United States
Effects of salinity on establishment of Populus fremontii (cottonwood) and Tamarix ramosissima (saltcedar)
Relating riparian vegetation to present and future streamflows
Establishment, sex structure and breeding system of an exotic riparian willow, Salix X rubens
Effects of gravel mining on natural cottonwood stands
Non-USGS Publications**
**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
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Filter Total Items: 88
Flood dependency of cottonwood establishment along the Missouri River, Montana, USA
Flow variability plays a central role in structuring the physical environment of riverine ecosystems. However, natural variability in flows along many rivers has been modified by water management activities. We quantified the relationship between flow and establishment of the dominant tree (plains cottonwood, Populus deltoides subsp. monilifera) along one of the least hydrologically altered alluviAuthorsMichael L. Scott, Gregor T. Auble, Jonathan M. FriedmanConstraints on establishment of plains cottonwood in an urban riparian preserve
Plot sampling and hydraulic modeling were combined to investigate establishment and survival of plains cottonwood along Boulder Creek, an urban stream on the Colorado Plains. We tested the hypothesis that establishment is limited to bare, moist surfaces produced by spring flooding in the current year. No cottonwood germination was observed in 1989 when peak flow was low. A moderate peak of 11.9 m3AuthorsG.T. Auble, M.L. Scott, J. M. Friedman, J. Back, V.J. LeeWater management and cottonwood forest dynamics along prairie streams
No abstract available.AuthorsJonathan M. Friedman, Michael L. Scott, Gregor T. AubleChannel narrowing and vegetation development following a great plains flood
Streams in the plains of eastern Colorado are prone to intense floods following summer thunderstorms. Here, and in other semiarid and arid regions, channel recovery after a flood may take several decades. As a result, flood history strongly influences spatial and temporal variability in bottomland vegetation. Interpretation of these patterns must be based on understanding the long—term response ofAuthorsJonathan M. Friedman, W. R. Osterkamp, William M. LewisFluvial process and the establishment of bottomland trees
The effects of river regulation on bottomland tree communities in western North America have generated substantial concern because of the important habitat and aesthetic values of these communities. Consideration of such effects in water management decisions has been hampered by the apparent variability of responses of bottomland tree communities to flow alteration. When the relation between streaAuthorsMichael L. Scott, Jonathan M. Friedman, Gregor T. AubleHistorical perspectives on riparian ecosystems of Colorado
No abstract available.AuthorsM. L. Scott, J. M. Friedman, G.T. Auble, P. AndersonThe role of vegetation and bed-level fluctuations in the process of channel narrowing
A catastrophic flood in 1965 on Plum Creek, a perennial sandbed stream in the western Great Plains, removed most of the bottomland vegetation and transformed the single-thalweg stream into a wider, braided channel. Following eight years of further widening associated with minor high flows, a process of channel narrowing began in 1973; narrowing continues today. The history of channel narrowing wasAuthorsJ. M. Friedman, W. R. Osterkamp, W.M. LewisEffects of salinity on establishment of Populus fremontii (cottonwood) and Tamarix ramosissima (saltcedar) in southwestern United States
The exotic shrub Tamarix ramosissima (saltcedar) has replaced the native Populus fremontii(cottonwood) along many streams in southwestern United States. We used a controlled outdoor experiment to examine the influence of river salinity on germination and first year survival of P. fremontii var. wislizenii (Rio Grande cottonwood) and T. ramosissima on freshly deposited alluvial bars. We grew both sAuthorsPatrick B. Shafroth, Jonathan M. Friedman, Lee S. IschingerEffects of salinity on establishment of Populus fremontii (cottonwood) and Tamarix ramosissima (saltcedar)
No abstract available.AuthorsP.B. Shafroth, J. M. Friedman, L.S. IschingerRelating riparian vegetation to present and future streamflows
No abstract available.AuthorsGregor T. Auble, Jonathan M. Friedman, Michael L. ScottEstablishment, sex structure and breeding system of an exotic riparian willow, Salix X rubens
Several Eurasian tree willows (Salix spp.) have become naturalized in riparian areas outside of their native range. Salix x rubens is a Eurasian willow that is conspicuous along streams in the high plains of Colorado. We examined establishment of seedlings and cuttings, the sex structure and the breeding system of S. x rubens. An experiment was conducted on establishment and growth of seedlings anAuthorsPatrick B. Shafroth, Michael L. Scott, Jonathan M. Friedman, Richard D. LavenEffects of gravel mining on natural cottonwood stands
No abstract available.AuthorsM. L. Scott, E. D. Eggleston, G.T. Auble, J. M. Friedman, L.S. IschingerNon-USGS Publications**
Friedman, J.M., M.L. Scott, and W.M. Lewis, Jr. 1995. Restoration of riparian forest using irrigation, artificial disturbance, and natural seedfall. Environmental Management. 19(4): 547-5.Auble, G.T., J.M. Friedman, and M.L. Scott. 1996. Test of a hydroperiod relation to predict changes in riparian vegetation. From big rivers to small streams. Kansas City, Missouri: Society of Wetland Scientists. p. 25-26.Friedman, J.M., G.T. Auble, and M.L. Scott. 1995. Geomorphic requirements for establishment and maintenance of cottonwood forest. Proceedings of the 46th annual meeting of the Great Plains Agricultural Council Forestry Committee. Great Plains Agricultural Council Publication No. 149. Manhattan, KS: Great Plains Agricultural Council. p. 80-88.
Friedman, J.M., M.L. Scott, G.T. Auble, and L.S. Ischinger. 1995. Plains cottonwood regenerates from natural seedfall on disturbed, irrigated sites. NBS Information Bulletin. Washington, DC: National Biological Service. 3 p.Auble, G.T., J.M. Friedman, and M.L. Scott. 1995. Regeneration processes and conservation of riparian forests in the Great Plains. Proceedings of the biodiversity conservation strategies for the Great Plains symposium. Austin, TX: The Nature Conservancy. p. 36-37.Auble, G.T., J.M. Friedman, M.L. Scott, and L.S. Ischinger. 1994. Geomorphic processes determine instream flow effects on cottonwood regeneration. NBS Information Bulletin 83. Washington, DC: U.S. Geological Survey. 1-3 p.Auble, G.T., M.L. Scott, J.M. Friedman, and L.S. Ischinger. 1994. Modeling effects of flow alteration on riparian vegetation. Research Information Bulletin 65. Washington, DC: National Biological Survey. 3 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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*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government