Glenn Guntenspergen, Ph.D.
Glenn is a Research Ecologist at the Eastern Ecological Science Center in Laurel, MD.
Science and Products
Filter Total Items: 14
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Threshold concepts: implications for the management of natural resources
Threshold concepts can have broad relevance in natural resource management. However, the concept of ecological thresholds has not been widely incorporated or adopted in management goals. This largely stems from the uncertainty revolving around threshold levels and the post hoc analyses that have generally been used to identify them. Natural resource managers have a need for new tools and approache
Authors
Glenn R. Guntenspergen, John Gross
Temperature sensitivity of organic-matter decay in tidal marshes
Approximately half of marine carbon sequestration takes place in coastal wetlands, including tidal marshes, where organic matter contributes to soil elevation and ecosystem persistence in the face of sea-level rise. The long-term viability of marshes and their carbon pools depends, in part, on how the balance between productivity and decay responds to climate change. Here, we report the sensitivit
Authors
Matthew L. Kirwan, Glenn R. Guntenspergen, J.A. Langley
Applying threshold concepts to conservation management of dryland ecosystems: Case studies on the Colorado Plateau
Ecosystems may occupy functionally distinct alternative states, some of which are more or less desirable from a management standpoint. Transitions from state to state are usually associated with a particular trigger or sequence of triggers, such as the addition or subtraction of a disturbance. Transitions are often not linear, rather it is common to see an abrupt transition come about even though
Authors
Matthew A. Bowker, Mark E. Miller, Steven L. Garman, Travis Belote
Evidence for 20th century climate warming and wetland drying in the North American Prairie Pothole Region
The Prairie Pothole Region (PPR) of North America is a globally important resource that provides abundant and valuable ecosystem goods and services in the form of biodiversity, groundwater recharge, water purification, flood attenuation, and water and forage for agriculture. Numerous studies have found these wetlands, which number in the millions, to be highly sensitive to climate variability. Her
Authors
B. A. Werner, W. Carter Johnson, Glenn R. Guntenspergen
The impact of sea-level rise on organic matter decay rates in Chesapeake Bay brackish tidal marshes
The balance between organic matter production and decay determines how fast coastal wetlands accumulate soil organic matter. Despite the importance of soil organic matter accumulation rates in influencing marsh elevation and resistance to sea-level rise, relatively little is known about how decomposition rates will respond to sea-level rise. Here, we estimate the sensitivity of decomposition to fl
Authors
M.L. Kirwanm, J.A. Langley, Gleen R. Guntenspergen, J.P. Megonigal
A global standard for monitoring coastal wetland vulnerability to accelerated sea-level rise
Sea-level rise threatens coastal salt-marshes and mangrove forests around the world, and a key determinant of coastal wetland vulnerability is whether its surface elevation can keep pace with rising sea level. Globally, a large data gap exists because wetland surface and shallow subsurface processes remain unaccounted for by traditional vulnerability assessments using tide gauges. Moreover, those
Authors
Edward L. Webb, Daniel A. Friess, Ken W. Krauss, Donald R. Cahoon, Glenn R. Guntenspergen, Jacob Phelps
A causal examination of the effects of confounding factors on multimetric indices
The development of multimetric indices (MMIs) as a means of providing integrative measures of ecosystem condition is becoming widespread. An increasingly recognized problem for the interpretability of MMIs is controlling for the potentially confounding influences of environmental covariates. Most common approaches to handling covariates are based on simple notions of statistical control, leaving t
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger, Brian R. Mitchell, Glenn R. Guntenspergen
Identification of metrics to monitor salt marsh integrity on National Wildlife Refuges in relation to conservation and management objectives
Executive Summary
Most salt marshes in the US have been degraded by human activities, and threats from physical alterations, surrounding land-use, species invasions, and global climate change persist. Salt marshes are unique and highly productive ecosystems with high intrinsic value to wildlife, and many National Wildlife Refuges (NWRs) have been established in coastal areas to protect large tract
Authors
Hilary A. Neckles, Glenn R. Guntenspergen, W. George Shriver, Nicholas P. Danz, Whitney A. Wiest, Jessica L. Nagel, Jennifer H. Olker
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 these bio
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger, Glenn R. Guntenspergen, Brian R. Mitchell, Kathryn M. Miller, Amanda M. Little
Summary of oceanographic and water-quality measurements near the Blackwater National Wildlife Refuge, Maryland, 2011
Suspended-sediment transport is a critical element governing the geomorphology of tidal marshes. Marshes rely on both organic material and inorganic sediment deposition to maintain their elevation relative to sea level. In wetlands near the Blackwater National Wildlife Refuge, Maryland, portions of the salt marsh have been subsiding relative to sea level since the early 20th century. Other portion
Authors
Neil K. Ganju, Patrick J. Dickhudt, Ellyn T. Montgomery, Patrick Brennand, R. Kyle Derby, Thomas W. Brooks, Glenn R. Guntenspergen, Marinna A. Martini, Jonathan Borden, Sandra M. Baldwin
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 implementing the expa
Authors
James B. Grace, Donald R. Schoolmaster, Glenn R. Guntenspergen, Amanda M. Little, Brian R. Mitchell, Kathryn M. Miller, E. William Schweiger
Anticipated effects of development on habitat fragmentation and movement of mammals into and out of the Schoodic District, Acadia National Park, Maine
Most national parks interact with adjacent lands because their boundaries fail to encompass all regional habitats, species pools, and migration routes. Activities planned for adjacent lands can have adverse effects on park resources and visitor experiences. For example, fragmentation of adjacent habitat into smaller and more isolated remnants may influence the suitability of park habitat for a wid
Authors
Jason J. Rohweder, Nathan R. De Jager, Glenn R. Guntenspergen
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 119
Threshold concepts: implications for the management of natural resources
Threshold concepts can have broad relevance in natural resource management. However, the concept of ecological thresholds has not been widely incorporated or adopted in management goals. This largely stems from the uncertainty revolving around threshold levels and the post hoc analyses that have generally been used to identify them. Natural resource managers have a need for new tools and approache
Authors
Glenn R. Guntenspergen, John Gross
Temperature sensitivity of organic-matter decay in tidal marshes
Approximately half of marine carbon sequestration takes place in coastal wetlands, including tidal marshes, where organic matter contributes to soil elevation and ecosystem persistence in the face of sea-level rise. The long-term viability of marshes and their carbon pools depends, in part, on how the balance between productivity and decay responds to climate change. Here, we report the sensitivit
Authors
Matthew L. Kirwan, Glenn R. Guntenspergen, J.A. Langley
Applying threshold concepts to conservation management of dryland ecosystems: Case studies on the Colorado Plateau
Ecosystems may occupy functionally distinct alternative states, some of which are more or less desirable from a management standpoint. Transitions from state to state are usually associated with a particular trigger or sequence of triggers, such as the addition or subtraction of a disturbance. Transitions are often not linear, rather it is common to see an abrupt transition come about even though
Authors
Matthew A. Bowker, Mark E. Miller, Steven L. Garman, Travis Belote
Evidence for 20th century climate warming and wetland drying in the North American Prairie Pothole Region
The Prairie Pothole Region (PPR) of North America is a globally important resource that provides abundant and valuable ecosystem goods and services in the form of biodiversity, groundwater recharge, water purification, flood attenuation, and water and forage for agriculture. Numerous studies have found these wetlands, which number in the millions, to be highly sensitive to climate variability. Her
Authors
B. A. Werner, W. Carter Johnson, Glenn R. Guntenspergen
The impact of sea-level rise on organic matter decay rates in Chesapeake Bay brackish tidal marshes
The balance between organic matter production and decay determines how fast coastal wetlands accumulate soil organic matter. Despite the importance of soil organic matter accumulation rates in influencing marsh elevation and resistance to sea-level rise, relatively little is known about how decomposition rates will respond to sea-level rise. Here, we estimate the sensitivity of decomposition to fl
Authors
M.L. Kirwanm, J.A. Langley, Gleen R. Guntenspergen, J.P. Megonigal
A global standard for monitoring coastal wetland vulnerability to accelerated sea-level rise
Sea-level rise threatens coastal salt-marshes and mangrove forests around the world, and a key determinant of coastal wetland vulnerability is whether its surface elevation can keep pace with rising sea level. Globally, a large data gap exists because wetland surface and shallow subsurface processes remain unaccounted for by traditional vulnerability assessments using tide gauges. Moreover, those
Authors
Edward L. Webb, Daniel A. Friess, Ken W. Krauss, Donald R. Cahoon, Glenn R. Guntenspergen, Jacob Phelps
A causal examination of the effects of confounding factors on multimetric indices
The development of multimetric indices (MMIs) as a means of providing integrative measures of ecosystem condition is becoming widespread. An increasingly recognized problem for the interpretability of MMIs is controlling for the potentially confounding influences of environmental covariates. Most common approaches to handling covariates are based on simple notions of statistical control, leaving t
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger, Brian R. Mitchell, Glenn R. Guntenspergen
Identification of metrics to monitor salt marsh integrity on National Wildlife Refuges in relation to conservation and management objectives
Executive Summary
Most salt marshes in the US have been degraded by human activities, and threats from physical alterations, surrounding land-use, species invasions, and global climate change persist. Salt marshes are unique and highly productive ecosystems with high intrinsic value to wildlife, and many National Wildlife Refuges (NWRs) have been established in coastal areas to protect large tract
Authors
Hilary A. Neckles, Glenn R. Guntenspergen, W. George Shriver, Nicholas P. Danz, Whitney A. Wiest, Jessica L. Nagel, Jennifer H. Olker
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 these bio
Authors
Donald R. Schoolmaster, James B. Grace, E. William Schweiger, Glenn R. Guntenspergen, Brian R. Mitchell, Kathryn M. Miller, Amanda M. Little
Summary of oceanographic and water-quality measurements near the Blackwater National Wildlife Refuge, Maryland, 2011
Suspended-sediment transport is a critical element governing the geomorphology of tidal marshes. Marshes rely on both organic material and inorganic sediment deposition to maintain their elevation relative to sea level. In wetlands near the Blackwater National Wildlife Refuge, Maryland, portions of the salt marsh have been subsiding relative to sea level since the early 20th century. Other portion
Authors
Neil K. Ganju, Patrick J. Dickhudt, Ellyn T. Montgomery, Patrick Brennand, R. Kyle Derby, Thomas W. Brooks, Glenn R. Guntenspergen, Marinna A. Martini, Jonathan Borden, Sandra M. Baldwin
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 implementing the expa
Authors
James B. Grace, Donald R. Schoolmaster, Glenn R. Guntenspergen, Amanda M. Little, Brian R. Mitchell, Kathryn M. Miller, E. William Schweiger
Anticipated effects of development on habitat fragmentation and movement of mammals into and out of the Schoodic District, Acadia National Park, Maine
Most national parks interact with adjacent lands because their boundaries fail to encompass all regional habitats, species pools, and migration routes. Activities planned for adjacent lands can have adverse effects on park resources and visitor experiences. For example, fragmentation of adjacent habitat into smaller and more isolated remnants may influence the suitability of park habitat for a wid
Authors
Jason J. Rohweder, Nathan R. De Jager, Glenn R. Guntenspergen