Bob Gresswell, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 78
The importance of wood in headwater streams of the Oregon Coast Range The importance of wood in headwater streams of the Oregon Coast Range
Although headwater streams comprise the majority of stream length in mountainous regions, little is known about their form and function in comparison to higher-order rivers. A better understanding of the role of headwater streams in routing water, wood, and sediment is needed to clarify the physical and biological connections among uplands, riparian zones, and downstream reaches.
Authors
Christine May, Robert E. Gresswell, Janet L. Erickson
Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A
Large wood recruitment and redistribution mechanisms were investigated in a 3.9 km2 basin with an old-growth Pseudotsuga menziesii (Mirb.) Franco and Tsuga heterophylla (Raf.) Sarg. forest, located in the southern Coast Range of Oregon. Stream size and topographic setting strongly influenced processes that delivered wood to the channel network. In small colluvial channels draining steep...
Authors
Christine L. May, Robert E. Gresswell
Processes and rates of sediment and wood accumulation in headwater streams of the Oregon Coast Range, USA Processes and rates of sediment and wood accumulation in headwater streams of the Oregon Coast Range, USA
Channels that have been scoured to bedrock by debris flows provide unique opportunities to calculate the rate of sediment and wood accumulation in low-order streams, to understand the temporal succession of channel morphology following disturbance, and to make inferences about processes associated with input and transport of sediment. Dendrochronology was used to estimate the time since...
Authors
Christine L. May, Robert E. Gresswell
Fire and aquatic ecosystems of the western USA: Current knowledge and key questions Fire and aquatic ecosystems of the western USA: Current knowledge and key questions
Understanding of the effects of wildland fire and fire management on aquatic and riparian ecosystems is an evolving field, with many questions still to be resolved. Limitations of current knowledge, and the certainty that fire management will continue, underscore the need to summarize available information. Integrating fire and fuels management with aquatic ecosystem conservation begins...
Authors
P.A. Bisson, B. Rieman, C. Luce, Paul F. Hessburg, D. Lee, J. Kershner, G.H. Reeves, Robert E. Gresswell
Effects of fire on fish populations: Landscape perspectives on persistance of native fishes and nonnative fish invasions Effects of fire on fish populations: Landscape perspectives on persistance of native fishes and nonnative fish invasions
Our limited understanding of the short and long-term effects of fire on fish contributes to considerable uncertainty in assessments of the risks and benefits of fire management alternatives. A primary concern among the many potential effects of fire is the effects of fire and fire management on persistence of native fish populations. Limited evidence suggests vulnerability of fish to...
Authors
J. B. Dunham, M. Young, Robert E. Gresswell, B. Rieman
Status of native fishes in the western United States and issues for fire and fuels management Status of native fishes in the western United States and issues for fire and fuels management
Conservation of native fishes and changing patterns in wildfire and fuels are defining challenges for managers of forested landscapes in the western United States. Many species and populations of native fishes have declined in recorded history and some now occur as isolated remnants of what once were larger more complex systems. Land management activities have been viewed as one cause of...
Authors
B. Rieman, D. Lee, D. Burns, Robert E. Gresswell, M. Young, R. Stowell, J. Rinne, P. Howell
Science and Products
Filter Total Items: 78
The importance of wood in headwater streams of the Oregon Coast Range The importance of wood in headwater streams of the Oregon Coast Range
Although headwater streams comprise the majority of stream length in mountainous regions, little is known about their form and function in comparison to higher-order rivers. A better understanding of the role of headwater streams in routing water, wood, and sediment is needed to clarify the physical and biological connections among uplands, riparian zones, and downstream reaches.
Authors
Christine May, Robert E. Gresswell, Janet L. Erickson
Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A
Large wood recruitment and redistribution mechanisms were investigated in a 3.9 km2 basin with an old-growth Pseudotsuga menziesii (Mirb.) Franco and Tsuga heterophylla (Raf.) Sarg. forest, located in the southern Coast Range of Oregon. Stream size and topographic setting strongly influenced processes that delivered wood to the channel network. In small colluvial channels draining steep...
Authors
Christine L. May, Robert E. Gresswell
Processes and rates of sediment and wood accumulation in headwater streams of the Oregon Coast Range, USA Processes and rates of sediment and wood accumulation in headwater streams of the Oregon Coast Range, USA
Channels that have been scoured to bedrock by debris flows provide unique opportunities to calculate the rate of sediment and wood accumulation in low-order streams, to understand the temporal succession of channel morphology following disturbance, and to make inferences about processes associated with input and transport of sediment. Dendrochronology was used to estimate the time since...
Authors
Christine L. May, Robert E. Gresswell
Fire and aquatic ecosystems of the western USA: Current knowledge and key questions Fire and aquatic ecosystems of the western USA: Current knowledge and key questions
Understanding of the effects of wildland fire and fire management on aquatic and riparian ecosystems is an evolving field, with many questions still to be resolved. Limitations of current knowledge, and the certainty that fire management will continue, underscore the need to summarize available information. Integrating fire and fuels management with aquatic ecosystem conservation begins...
Authors
P.A. Bisson, B. Rieman, C. Luce, Paul F. Hessburg, D. Lee, J. Kershner, G.H. Reeves, Robert E. Gresswell
Effects of fire on fish populations: Landscape perspectives on persistance of native fishes and nonnative fish invasions Effects of fire on fish populations: Landscape perspectives on persistance of native fishes and nonnative fish invasions
Our limited understanding of the short and long-term effects of fire on fish contributes to considerable uncertainty in assessments of the risks and benefits of fire management alternatives. A primary concern among the many potential effects of fire is the effects of fire and fire management on persistence of native fish populations. Limited evidence suggests vulnerability of fish to...
Authors
J. B. Dunham, M. Young, Robert E. Gresswell, B. Rieman
Status of native fishes in the western United States and issues for fire and fuels management Status of native fishes in the western United States and issues for fire and fuels management
Conservation of native fishes and changing patterns in wildfire and fuels are defining challenges for managers of forested landscapes in the western United States. Many species and populations of native fishes have declined in recorded history and some now occur as isolated remnants of what once were larger more complex systems. Land management activities have been viewed as one cause of...
Authors
B. Rieman, D. Lee, D. Burns, Robert E. Gresswell, M. Young, R. Stowell, J. Rinne, P. Howell