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
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Negligible influence of spatial autocorrelation in the assessment of fire effects in a mixed conifer forest Negligible influence of spatial autocorrelation in the assessment of fire effects in a mixed conifer forest
Fire is an important feature of many forest ecosystems, although the quantification of its effects is compromised by the large scale at which fire occurs and its inherent unpredictability. A recurring problem is the use of subsamples collected within individual burns, potentially resulting in spatially autocorrelated data. Using subsamples from six different fires (and three unburned...
Authors
P. J. van Mantgem, D.W. Schwilk
Widespread increase of tree mortality rates in the Western United States Widespread increase of tree mortality rates in the Western United States
Persistent changes in tree mortality rates can alter forest structure, composition, and ecosystem services such as carbon sequestration. Our analyses of longitudinal data from unmanaged old forests in the western United States showed that background (noncatastrophic) mortality rates have increased rapidly in recent decades, with doubling periods ranging from 17 to 29 years among regions...
Authors
P. J. van Mantgem, N.L. Stephenson, J.C. Byrne, L.D. Daniels, J.F. Franklin, P.Z. Fule, M. E. Harmon, A.J. Larson, Joseph M. Smith, A.H. Taylor, T.T. Veblen
Spatial elements of mortality risk in old-growth forests Spatial elements of mortality risk in old-growth forests
For many species of long-lived organisms, such as trees, survival appears to be the most critical vital rate affecting population persistence. However, methods commonly used to quantify tree death, such as relating tree mortality risk solely to diameter growth, almost certainly do not account for important spatial processes. Our goal in this study was to detect and, if present, to...
Authors
Adrian Das, John Battles, Phillip J. van Mantgem, Nathan L. Stephenson
The relationship between tree growth patterns and likelihood of mortality: A study of two tree species in the Sierra Nevada The relationship between tree growth patterns and likelihood of mortality: A study of two tree species in the Sierra Nevada
We examined mortality of Abies concolor (Gord. & Glend.) Lindl. (white fir) and Pinus lambertiana Dougl. (sugar pine) by developing logistic models using three growth indices obtained from tree rings: average growth, growth trend, and count of abrupt growth declines. For P. lambertiana, models with average growth, growth trend, and count of abrupt declines improved overall prediction (78...
Authors
A.J. Das, J. J. Battles, N.L. Stephenson, P. J. van Mantgem
Apparent climatically induced increase of tree mortality rates in a temperate forest Apparent climatically induced increase of tree mortality rates in a temperate forest
We provide a first detailed analysis of long-term, annual-resolution demographic trends in a temperate forest. After tracking the fates of 21 338 trees in a network of old-growth forest plots in the Sierra Nevada of California, we found that mortality rate, but not the recruitment rate, increased significantly over the 22 years of measurement (1983-2004). Mortality rates increased in...
Authors
P. J. van Mantgem, N.L. Stephenson
Forest reproduction along a climatic gradient in the Sierra Nevada, California Forest reproduction along a climatic gradient in the Sierra Nevada, California
To elucidate broad-scale environmental controls of coniferous forest reproduction in the Sierra Nevada, California, we monitored reproduction for 5 years in 47 plots arrayed across a steep elevational (climatic) gradient. We found that both absolute seedling densities (stems
Authors
Phillip J. van Mantgem, Nathan L. Stephenson, Jon E. Keeley
Science and Products
Filter Total Items: 13
Filter Total Items: 16
No Result Found
Filter Total Items: 79
Negligible influence of spatial autocorrelation in the assessment of fire effects in a mixed conifer forest Negligible influence of spatial autocorrelation in the assessment of fire effects in a mixed conifer forest
Fire is an important feature of many forest ecosystems, although the quantification of its effects is compromised by the large scale at which fire occurs and its inherent unpredictability. A recurring problem is the use of subsamples collected within individual burns, potentially resulting in spatially autocorrelated data. Using subsamples from six different fires (and three unburned...
Authors
P. J. van Mantgem, D.W. Schwilk
Widespread increase of tree mortality rates in the Western United States Widespread increase of tree mortality rates in the Western United States
Persistent changes in tree mortality rates can alter forest structure, composition, and ecosystem services such as carbon sequestration. Our analyses of longitudinal data from unmanaged old forests in the western United States showed that background (noncatastrophic) mortality rates have increased rapidly in recent decades, with doubling periods ranging from 17 to 29 years among regions...
Authors
P. J. van Mantgem, N.L. Stephenson, J.C. Byrne, L.D. Daniels, J.F. Franklin, P.Z. Fule, M. E. Harmon, A.J. Larson, Joseph M. Smith, A.H. Taylor, T.T. Veblen
Spatial elements of mortality risk in old-growth forests Spatial elements of mortality risk in old-growth forests
For many species of long-lived organisms, such as trees, survival appears to be the most critical vital rate affecting population persistence. However, methods commonly used to quantify tree death, such as relating tree mortality risk solely to diameter growth, almost certainly do not account for important spatial processes. Our goal in this study was to detect and, if present, to...
Authors
Adrian Das, John Battles, Phillip J. van Mantgem, Nathan L. Stephenson
The relationship between tree growth patterns and likelihood of mortality: A study of two tree species in the Sierra Nevada The relationship between tree growth patterns and likelihood of mortality: A study of two tree species in the Sierra Nevada
We examined mortality of Abies concolor (Gord. & Glend.) Lindl. (white fir) and Pinus lambertiana Dougl. (sugar pine) by developing logistic models using three growth indices obtained from tree rings: average growth, growth trend, and count of abrupt growth declines. For P. lambertiana, models with average growth, growth trend, and count of abrupt declines improved overall prediction (78...
Authors
A.J. Das, J. J. Battles, N.L. Stephenson, P. J. van Mantgem
Apparent climatically induced increase of tree mortality rates in a temperate forest Apparent climatically induced increase of tree mortality rates in a temperate forest
We provide a first detailed analysis of long-term, annual-resolution demographic trends in a temperate forest. After tracking the fates of 21 338 trees in a network of old-growth forest plots in the Sierra Nevada of California, we found that mortality rate, but not the recruitment rate, increased significantly over the 22 years of measurement (1983-2004). Mortality rates increased in...
Authors
P. J. van Mantgem, N.L. Stephenson
Forest reproduction along a climatic gradient in the Sierra Nevada, California Forest reproduction along a climatic gradient in the Sierra Nevada, California
To elucidate broad-scale environmental controls of coniferous forest reproduction in the Sierra Nevada, California, we monitored reproduction for 5 years in 47 plots arrayed across a steep elevational (climatic) gradient. We found that both absolute seedling densities (stems
Authors
Phillip J. van Mantgem, Nathan L. Stephenson, Jon E. Keeley