Phillip van Mantgem
Phil van Mantgem is a research ecologist at the Western Ecological Research Center.
RESEARCH INTERESTS
- Conservation biology
- Fire ecology
- Forest ecology
Professional Experience
Research Ecologist, USGS, Redwood Field Station, Arcata, CA, 2008 - Present
Ecologist, USGS, Sequoia and Kings Canyon Field Station, Three Rivers, CA, 2000 - 2008
Education and Certifications
Ph.D., Ecology, University of California, Davis, CA 2001
M.S., Plant Biology, University of California, Davis, CA 1996
B.S., Botany, University of Iowa, Iowa City, IA 1991
Science and Products
Fire Severity Trends in the Western U.S.
How will increased drought affect forest fire severity? WERC’s Dr. Phil van Mantgem is testing the idea increased drought stress may affect forest fire severity independent of fire intensity. Drought stress prior to fire can affect tree health, potentially resulting in a higher sensitivity to fire-induced damage. Thus, with drought there may be ongoing increases in fire severity (the number of...
Redwood Field Station
The Redwood Field Station is located in Arcata, CA. Click on the following tab to learn more.
Can Prescribed Fire Help Forests Survive Drought in the Sierra Nevada Mountains?
In 2017, California was experiencing its most severe drought in over a millennia. Low rainfall and record high temperatures resulted in increased tree mortality and complete forest diebacks across the West. Though land managers scrambled to respond, they lacked information needed to make informed decisions. Focusing on California’s central and southern Sierra Nevada Mountains, this...
Fighting Drought with Fire: A Comparison of Burned and Unburned Forests in Drought-Impacted Areas of the Southwest
Drought is one of the biggest threats facing our forests today. In the western U.S., severe drought and rising temperatures have caused increased tree mortality and complete forest diebacks. Forests are changing rapidly, and while land managers are working to develop long-term climate change adaptation plans, they require tools that can enhance forest resistance to drought now. To...
How Does Drought Influence Fire Severity in the Southwestern U.S.?
There is a growing realization that current warming trends may be associated with increases in the size, frequency, and severity of forest fires in the West. While rising temperatures can create drought conditions that favor severe fires, it is also possible that drought limits the ability of trees to survive a fire. During a drought, there is less water available for trees and more...
Characterizing a link in the terrestrial carbon cycle: a global overview of individual tree mass growth
Forests sequester the majority of the terrestrial biosphere’s carbon and are key components of the global carbon cycle, potentially contributing substantial feedbacks to ongoing climatic changes. It is therefore remarkable that no consensus yet exists about the fundamental nature of tree mass growth (and thus carbon sequestration rate). Specifically, does tree mass growth rate increase...
Filter Total Items: 16
Data Describing Site Characteristics Including Conifer Regeneration Following the 2018 Carr Fire in Whiskeytown National Recreation Area Data Describing Site Characteristics Including Conifer Regeneration Following the 2018 Carr Fire in Whiskeytown National Recreation Area
This dataset provides seedling density and site characteristics for 131 plots in Whiskeytown National Recreation Area in California, USA. Site characteristics include modeled seed availability and terrain indices calculated using a 1 meter resolution digital elevation model (DEM).
Stem and Needle Growth for Whitebark Pine in the Sierra Nevada Stem and Needle Growth for Whitebark Pine in the Sierra Nevada
These data represent stem growth, needle length growth, and carbon stable isotope ratios from whitebark pine at 27 sites in the Sierra Nevada of California. Values for stem growth were derived from increment cores, processed following standard methods. Needle characteristics were captured for individual trees across all years needles were present on the internodes. Needle length was...
poscrptR poscrptR
poscrptR is a simple R package with the sole purpose of distributing a shiny app for predicting post-fire conifer regeneration. Learn more about shiny apps here.
Growth, Drought Response, and Genomic Structure Data for Whitebark Pine in the Sierra Nevada of California (ver. 2.0, May 2023) Growth, Drought Response, and Genomic Structure Data for Whitebark Pine in the Sierra Nevada of California (ver. 2.0, May 2023)
These data represent stem growth from whitebark pine at 27 sites in the Sierra Nevada of California. Values for stem growth were derived from increment cores, processed following standard methods. Samples were also compared against a genomic data collected at the same trees. These data support the following publication: van Mantgem, P.J., Milano, E.R., Dudney, J., Nesmith, J.C.B...
Sequoia and Yosemite National Parks Mortality and Fire Data (1990-2019) for Competition-Fire-Drought Interaction Analysis Sequoia and Yosemite National Parks Mortality and Fire Data (1990-2019) for Competition-Fire-Drought Interaction Analysis
This dataset records mortality-- including involvement of bark beetles-- and burn severity information for trees in long term forest dynamics plots in Sequoia National Park and Yosemite National Park that experienced fire. These data support the following publication: Furniss, T.J., Das, A.J., van Mantgem, P.J., Stephenson, N.L. and Lutz, J.A., 2021. Crowding, climate, and the case for...
Seed source, not drought, determines patterns of seed production in Sierra Nevada conifers Seed source, not drought, determines patterns of seed production in Sierra Nevada conifers
This release consists of data collected from 26 plots in two national parks over a 19-year period. The data consists of plot-level seed counts for three genera, number of seed traps, live tree basal area, plot area, and climate metrics from the gridmet gridded data set, the daymet gridded data set, the PRISM gridded data set, and two nearby COOP stations.
Filter Total Items: 78
Best practices for distributing and deploying U.S. Geological Survey Shiny applications Best practices for distributing and deploying U.S. Geological Survey Shiny applications
A goal of U.S. Geological Survey (USGS) research is to create actionable science for U.S. Department of the Interior managers and partners. Properly managed and released software tools can quickly, accurately, and easily translate scientific results to aid managers’ decision-making. The USGS policies on software development and distribution affect how authors of USGS software products...
Authors
Daniel F. Shryock, Micah Wright, Phillip J. van Mantgem, Todd Esque
Growth, drought response, and climate-associated genomic structure in whitebark pine in the Sierra Nevada of California Growth, drought response, and climate-associated genomic structure in whitebark pine in the Sierra Nevada of California
Whitebark pine (Pinus albicaulis Engelm.) has experienced rapid population declines and is listed as threatened under the Endangered Species Act in the United States. Whitebark pine in the Sierra Nevada of California represents the southernmost end of the species' distribution and, like other portions of its range, faces threats from an introduced pathogen, native bark beetles, and a...
Authors
Phillip J. van Mantgem, Elizabeth R. Milano, Joan Dudney, Jonathan Nesmith, Amy G. Vandergast, Harold S.J. Zald
The energy–water limitation threshold explains divergent drought responses in tree growth, needle length, and stable isotope ratios The energy–water limitation threshold explains divergent drought responses in tree growth, needle length, and stable isotope ratios
Predicted increases in extreme droughts will likely cause major shifts in carbon sequestration and forest composition. Although growth declines during drought are widely documented, an increasing number of studies have reported both positive and negative responses to the same drought. These divergent growth patterns may reflect thresholds (i.e., nonlinear responses) promoted by changes...
Authors
Joan Dudney, Andrew M. Latimer, Phillip J. van Mantgem, Harold S. Zald, Claire E Willing, Jonathan Nesmith, Jennifer E Cribbs, Elizabeth R. Milano
Forest structure and residual tree growth at the Northwest Gateway project area, Lassen Volcanic National Park, California Forest structure and residual tree growth at the Northwest Gateway project area, Lassen Volcanic National Park, California
Mechanical thinning and prescribed fire are common mitigation treatments to reduce fire hazards. However, these treatments are infrequently applied together within national parks. The Northwest Gateway project at Lassen Volcanic National Park is an exception to this pattern. Various thinning prescriptions were applied to the project area in 2014, with a subset of the area prescribed...
Authors
Micah Wright, Phillip J. van Mantgem, Calvin Farris
Drought survival strategies differ between coastal and montane conifers in northern California Drought survival strategies differ between coastal and montane conifers in northern California
Increasingly severe and prolonged droughts are contributing to tree stress and forest mortality across western North America. However, in many cases, we currently have poor information concerning how drought responses in forests vary in relation to competition, climate, and site and tree characteristics. We used annual tree ring evidence of 13C discrimination (Δ13C) and growth metrics to...
Authors
Wallis Robinson, Lucy P. Kerhoulas, Rosemary L. Sherriff, Gabriel Roletti, Phillip J. van Mantgem
Predictive accuracy of post-fire conifer death declines over time in models based on crown and bole injury Predictive accuracy of post-fire conifer death declines over time in models based on crown and bole injury
A key uncertainty of empirical models of post-fire tree mortality is understanding the drivers of elevated post-fire mortality several years following fire, known as delayed mortality. Delayed mortality can represent a substantial fraction of mortality, particularly for large trees that are a conservation focus in western US coniferous forests. Current post-fire tree mortality models...
Authors
Timothy M. Shearman, J. Morgan Varner, Sharon M. Hood, Phillip J. van Mantgem, C. Alina Cansler, Micah Wright
Science and Products
Fire Severity Trends in the Western U.S.
How will increased drought affect forest fire severity? WERC’s Dr. Phil van Mantgem is testing the idea increased drought stress may affect forest fire severity independent of fire intensity. Drought stress prior to fire can affect tree health, potentially resulting in a higher sensitivity to fire-induced damage. Thus, with drought there may be ongoing increases in fire severity (the number of...
Redwood Field Station
The Redwood Field Station is located in Arcata, CA. Click on the following tab to learn more.
Can Prescribed Fire Help Forests Survive Drought in the Sierra Nevada Mountains?
In 2017, California was experiencing its most severe drought in over a millennia. Low rainfall and record high temperatures resulted in increased tree mortality and complete forest diebacks across the West. Though land managers scrambled to respond, they lacked information needed to make informed decisions. Focusing on California’s central and southern Sierra Nevada Mountains, this...
Fighting Drought with Fire: A Comparison of Burned and Unburned Forests in Drought-Impacted Areas of the Southwest
Drought is one of the biggest threats facing our forests today. In the western U.S., severe drought and rising temperatures have caused increased tree mortality and complete forest diebacks. Forests are changing rapidly, and while land managers are working to develop long-term climate change adaptation plans, they require tools that can enhance forest resistance to drought now. To...
How Does Drought Influence Fire Severity in the Southwestern U.S.?
There is a growing realization that current warming trends may be associated with increases in the size, frequency, and severity of forest fires in the West. While rising temperatures can create drought conditions that favor severe fires, it is also possible that drought limits the ability of trees to survive a fire. During a drought, there is less water available for trees and more...
Characterizing a link in the terrestrial carbon cycle: a global overview of individual tree mass growth
Forests sequester the majority of the terrestrial biosphere’s carbon and are key components of the global carbon cycle, potentially contributing substantial feedbacks to ongoing climatic changes. It is therefore remarkable that no consensus yet exists about the fundamental nature of tree mass growth (and thus carbon sequestration rate). Specifically, does tree mass growth rate increase...
Filter Total Items: 16
Data Describing Site Characteristics Including Conifer Regeneration Following the 2018 Carr Fire in Whiskeytown National Recreation Area Data Describing Site Characteristics Including Conifer Regeneration Following the 2018 Carr Fire in Whiskeytown National Recreation Area
This dataset provides seedling density and site characteristics for 131 plots in Whiskeytown National Recreation Area in California, USA. Site characteristics include modeled seed availability and terrain indices calculated using a 1 meter resolution digital elevation model (DEM).
Stem and Needle Growth for Whitebark Pine in the Sierra Nevada Stem and Needle Growth for Whitebark Pine in the Sierra Nevada
These data represent stem growth, needle length growth, and carbon stable isotope ratios from whitebark pine at 27 sites in the Sierra Nevada of California. Values for stem growth were derived from increment cores, processed following standard methods. Needle characteristics were captured for individual trees across all years needles were present on the internodes. Needle length was...
poscrptR poscrptR
poscrptR is a simple R package with the sole purpose of distributing a shiny app for predicting post-fire conifer regeneration. Learn more about shiny apps here.
Growth, Drought Response, and Genomic Structure Data for Whitebark Pine in the Sierra Nevada of California (ver. 2.0, May 2023) Growth, Drought Response, and Genomic Structure Data for Whitebark Pine in the Sierra Nevada of California (ver. 2.0, May 2023)
These data represent stem growth from whitebark pine at 27 sites in the Sierra Nevada of California. Values for stem growth were derived from increment cores, processed following standard methods. Samples were also compared against a genomic data collected at the same trees. These data support the following publication: van Mantgem, P.J., Milano, E.R., Dudney, J., Nesmith, J.C.B...
Sequoia and Yosemite National Parks Mortality and Fire Data (1990-2019) for Competition-Fire-Drought Interaction Analysis Sequoia and Yosemite National Parks Mortality and Fire Data (1990-2019) for Competition-Fire-Drought Interaction Analysis
This dataset records mortality-- including involvement of bark beetles-- and burn severity information for trees in long term forest dynamics plots in Sequoia National Park and Yosemite National Park that experienced fire. These data support the following publication: Furniss, T.J., Das, A.J., van Mantgem, P.J., Stephenson, N.L. and Lutz, J.A., 2021. Crowding, climate, and the case for...
Seed source, not drought, determines patterns of seed production in Sierra Nevada conifers Seed source, not drought, determines patterns of seed production in Sierra Nevada conifers
This release consists of data collected from 26 plots in two national parks over a 19-year period. The data consists of plot-level seed counts for three genera, number of seed traps, live tree basal area, plot area, and climate metrics from the gridmet gridded data set, the daymet gridded data set, the PRISM gridded data set, and two nearby COOP stations.
Filter Total Items: 78
Best practices for distributing and deploying U.S. Geological Survey Shiny applications Best practices for distributing and deploying U.S. Geological Survey Shiny applications
A goal of U.S. Geological Survey (USGS) research is to create actionable science for U.S. Department of the Interior managers and partners. Properly managed and released software tools can quickly, accurately, and easily translate scientific results to aid managers’ decision-making. The USGS policies on software development and distribution affect how authors of USGS software products...
Authors
Daniel F. Shryock, Micah Wright, Phillip J. van Mantgem, Todd Esque
Growth, drought response, and climate-associated genomic structure in whitebark pine in the Sierra Nevada of California Growth, drought response, and climate-associated genomic structure in whitebark pine in the Sierra Nevada of California
Whitebark pine (Pinus albicaulis Engelm.) has experienced rapid population declines and is listed as threatened under the Endangered Species Act in the United States. Whitebark pine in the Sierra Nevada of California represents the southernmost end of the species' distribution and, like other portions of its range, faces threats from an introduced pathogen, native bark beetles, and a...
Authors
Phillip J. van Mantgem, Elizabeth R. Milano, Joan Dudney, Jonathan Nesmith, Amy G. Vandergast, Harold S.J. Zald
The energy–water limitation threshold explains divergent drought responses in tree growth, needle length, and stable isotope ratios The energy–water limitation threshold explains divergent drought responses in tree growth, needle length, and stable isotope ratios
Predicted increases in extreme droughts will likely cause major shifts in carbon sequestration and forest composition. Although growth declines during drought are widely documented, an increasing number of studies have reported both positive and negative responses to the same drought. These divergent growth patterns may reflect thresholds (i.e., nonlinear responses) promoted by changes...
Authors
Joan Dudney, Andrew M. Latimer, Phillip J. van Mantgem, Harold S. Zald, Claire E Willing, Jonathan Nesmith, Jennifer E Cribbs, Elizabeth R. Milano
Forest structure and residual tree growth at the Northwest Gateway project area, Lassen Volcanic National Park, California Forest structure and residual tree growth at the Northwest Gateway project area, Lassen Volcanic National Park, California
Mechanical thinning and prescribed fire are common mitigation treatments to reduce fire hazards. However, these treatments are infrequently applied together within national parks. The Northwest Gateway project at Lassen Volcanic National Park is an exception to this pattern. Various thinning prescriptions were applied to the project area in 2014, with a subset of the area prescribed...
Authors
Micah Wright, Phillip J. van Mantgem, Calvin Farris
Drought survival strategies differ between coastal and montane conifers in northern California Drought survival strategies differ between coastal and montane conifers in northern California
Increasingly severe and prolonged droughts are contributing to tree stress and forest mortality across western North America. However, in many cases, we currently have poor information concerning how drought responses in forests vary in relation to competition, climate, and site and tree characteristics. We used annual tree ring evidence of 13C discrimination (Δ13C) and growth metrics to...
Authors
Wallis Robinson, Lucy P. Kerhoulas, Rosemary L. Sherriff, Gabriel Roletti, Phillip J. van Mantgem
Predictive accuracy of post-fire conifer death declines over time in models based on crown and bole injury Predictive accuracy of post-fire conifer death declines over time in models based on crown and bole injury
A key uncertainty of empirical models of post-fire tree mortality is understanding the drivers of elevated post-fire mortality several years following fire, known as delayed mortality. Delayed mortality can represent a substantial fraction of mortality, particularly for large trees that are a conservation focus in western US coniferous forests. Current post-fire tree mortality models...
Authors
Timothy M. Shearman, J. Morgan Varner, Sharon M. Hood, Phillip J. van Mantgem, C. Alina Cansler, Micah Wright