James Grace, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 187
A general theory of multimetric indices and their properties A general theory of multimetric indices and their properties
1. Stewardship of biological and ecological resources requires the ability to make integrative assessments of ecological integrity. One of the emerging methods for making such integrative assessments is multimetric indices (MMIs). These indices synthesize data, often from multiple levels of biological organization, with the goal of deriving a single index that reflects the overall...
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger
An algorithmic and information-theoretic approach to multimetric index construction An algorithmic and information-theoretic approach to multimetric index construction
The use of multimetric indices (MMIs), such as the widely used index of biological integrity (IBI), to measure, track, summarize and infer the overall impact of human disturbance on biological communities has been steadily growing in recent years. Initially, MMIs were developed for aquatic communities using pre-selected biological metrics as indicators of system integrity. As interest in...
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger, Glenn R. Guntenspergen, Brian R. Mitchell, Kathryn M. Miller, Amanda M. Little
Guidelines for a graph-theoretic implementation of structural equation modeling Guidelines for a graph-theoretic implementation of structural equation modeling
Structural equation modeling (SEM) is increasingly being chosen by researchers as a framework for gaining scientific insights from the quantitative analyses of data. New ideas and methods emerging from the study of causality, influences from the field of graphical modeling, and advances in statistics are expanding the rigor, capability, and even purpose of SEM. Guidelines for...
Authors
James B. Grace, Donald R. Schoolmaster, Glenn R. Guntenspergen, Amanda M. Little, Brian R. Mitchell, Kathryn M. Miller, E. William Schweiger
Biodiversity loss and its impact on humanity Biodiversity loss and its impact on humanity
The most unique feature of Earth is the existence of life, and the most extraordinary feature of life is its diversity. Approximately 9 million types of plants, animals, protists and fungi inhabit the Earth. So, too, do 7 billion people. Two decades ago, at the first Earth Summit, the vast majority of the world's nations declared that human actions were dismantling the Earth's ecosystems
Authors
Bradley J. Cardinale, J. Emmett Duffy, Andrew Gonzalez, David U. Hooper, Charles Perrings, Patrick Venail, Anita Narwani, Georgina M. Mace, David Tilman, David A. Wardle, Ann P. Kinzig, Gretchen C. Daily, Michel Loreau, James B. Grace, Anne Larigauderie, Diane S. Srivastava, Shahid Naeem
Response to comments on "Productivity is a poor predictor of plant species richness" Response to comments on "Productivity is a poor predictor of plant species richness"
Pan et al. claim that our results actually support a strong linear positive relationship between productivity and richness, whereas Fridley et al. contend that the data support a strong humped relationship. These responses illustrate how preoccupation with bivariate patterns distracts from a deeper understanding of the multivariate mechanisms that control these important ecosystem...
Authors
James B. Grace, Peter B. Adler, Eric W. Seabloom, Elizabeth T. Borer, Helmut Hillebrand, Yann Hautier, Andy Hector, W. Stanley Harpole, Lydia R. O’Halloran, T. Michael Anderson, Jonathan D. Bakker, Cynthia S. Brown, Yvonne M. Buckley, Scott L. Collins, Kathryn L. Cottingham, Michael J. Crawley, Ellen Ingman Damschen, Kendi F. Davies, Nicole M. DeCrappeo, Philip A. Fay, Jennifer Firn, Daniel S. Gruner, Nicole Hagenah, Virginia L. Jin, Kevin P. Kirkman, Johannes M.H. Knops, Kimberly J. La Pierre, John G. Lambrinos, Brett A. Melbourne, Charles E. Mitchell, Joslin L. Moore, John W. Morgan, John L. Orrock, Suzanne M. Prover, Carly J. Stevens, Peter D. Wragg, Louie H. Yang
Effects of prescribed burning on marsh-elevation change and the risk of wetland loss Effects of prescribed burning on marsh-elevation change and the risk of wetland loss
Marsh-elevation change is the net effect of biophysical processes controlling inputs versus losses of soil volume. In many marshes, accumulation of organic matter is an important contributor to soil volume and vertical land building. In this study, we examined how prescribed burning, a common marsh-management practice, may affect elevation dynamics in the McFaddin National Wildlife...
Authors
Karen L. McKee, James B. Grace
Science and Products
Filter Total Items: 187
A general theory of multimetric indices and their properties A general theory of multimetric indices and their properties
1. Stewardship of biological and ecological resources requires the ability to make integrative assessments of ecological integrity. One of the emerging methods for making such integrative assessments is multimetric indices (MMIs). These indices synthesize data, often from multiple levels of biological organization, with the goal of deriving a single index that reflects the overall...
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger
An algorithmic and information-theoretic approach to multimetric index construction An algorithmic and information-theoretic approach to multimetric index construction
The use of multimetric indices (MMIs), such as the widely used index of biological integrity (IBI), to measure, track, summarize and infer the overall impact of human disturbance on biological communities has been steadily growing in recent years. Initially, MMIs were developed for aquatic communities using pre-selected biological metrics as indicators of system integrity. As interest in...
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger, Glenn R. Guntenspergen, Brian R. Mitchell, Kathryn M. Miller, Amanda M. Little
Guidelines for a graph-theoretic implementation of structural equation modeling Guidelines for a graph-theoretic implementation of structural equation modeling
Structural equation modeling (SEM) is increasingly being chosen by researchers as a framework for gaining scientific insights from the quantitative analyses of data. New ideas and methods emerging from the study of causality, influences from the field of graphical modeling, and advances in statistics are expanding the rigor, capability, and even purpose of SEM. Guidelines for...
Authors
James B. Grace, Donald R. Schoolmaster, Glenn R. Guntenspergen, Amanda M. Little, Brian R. Mitchell, Kathryn M. Miller, E. William Schweiger
Biodiversity loss and its impact on humanity Biodiversity loss and its impact on humanity
The most unique feature of Earth is the existence of life, and the most extraordinary feature of life is its diversity. Approximately 9 million types of plants, animals, protists and fungi inhabit the Earth. So, too, do 7 billion people. Two decades ago, at the first Earth Summit, the vast majority of the world's nations declared that human actions were dismantling the Earth's ecosystems
Authors
Bradley J. Cardinale, J. Emmett Duffy, Andrew Gonzalez, David U. Hooper, Charles Perrings, Patrick Venail, Anita Narwani, Georgina M. Mace, David Tilman, David A. Wardle, Ann P. Kinzig, Gretchen C. Daily, Michel Loreau, James B. Grace, Anne Larigauderie, Diane S. Srivastava, Shahid Naeem
Response to comments on "Productivity is a poor predictor of plant species richness" Response to comments on "Productivity is a poor predictor of plant species richness"
Pan et al. claim that our results actually support a strong linear positive relationship between productivity and richness, whereas Fridley et al. contend that the data support a strong humped relationship. These responses illustrate how preoccupation with bivariate patterns distracts from a deeper understanding of the multivariate mechanisms that control these important ecosystem...
Authors
James B. Grace, Peter B. Adler, Eric W. Seabloom, Elizabeth T. Borer, Helmut Hillebrand, Yann Hautier, Andy Hector, W. Stanley Harpole, Lydia R. O’Halloran, T. Michael Anderson, Jonathan D. Bakker, Cynthia S. Brown, Yvonne M. Buckley, Scott L. Collins, Kathryn L. Cottingham, Michael J. Crawley, Ellen Ingman Damschen, Kendi F. Davies, Nicole M. DeCrappeo, Philip A. Fay, Jennifer Firn, Daniel S. Gruner, Nicole Hagenah, Virginia L. Jin, Kevin P. Kirkman, Johannes M.H. Knops, Kimberly J. La Pierre, John G. Lambrinos, Brett A. Melbourne, Charles E. Mitchell, Joslin L. Moore, John W. Morgan, John L. Orrock, Suzanne M. Prover, Carly J. Stevens, Peter D. Wragg, Louie H. Yang
Effects of prescribed burning on marsh-elevation change and the risk of wetland loss Effects of prescribed burning on marsh-elevation change and the risk of wetland loss
Marsh-elevation change is the net effect of biophysical processes controlling inputs versus losses of soil volume. In many marshes, accumulation of organic matter is an important contributor to soil volume and vertical land building. In this study, we examined how prescribed burning, a common marsh-management practice, may affect elevation dynamics in the McFaddin National Wildlife...
Authors
Karen L. McKee, James B. Grace