Glenn Guntenspergen, Ph.D.
Glenn is a Research Ecologist at the Eastern Ecological Science Center in Laurel, MD.
Science and Products
Filter Total Items: 16
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Filter Total Items: 128
Experimental tree mortality does not induce marsh transgression in a Chesapeake Bay low-lying coastal forest
Transgression into adjacent uplands is an important global response of coastal wetlands to accelerated rates of sea level rise. “Ghost forests” mark a signature characteristic of marsh transgression on the landscape, as changes in tidal inundation and salinity cause bordering upland tree mortality, increase light availability, and the emergence of tidal marsh species due to reduced...
Authors
David C Walters, Joel Carr, Alyssa Hockaday, Joshua A Jones, Eliza McFarland, Katya Kovalenko, Matthew L. Kirwan, Donald R. Cahoon, Glenn Guntenspergen
Changes in organic carbon source and storage with sea level rise-induced transgression in a Chesapeake Bay marsh
Organic matter (OM) accumulation in marsh soils affects marsh survival under rapid sea-level rise (SLR). This work describes the changing organic geochemistry of a salt marsh located in the Blackwater National Wildlife Refuge on the eastern shore of Chesapeake Bay that has transgressed inland with SLR over the past 35–75 years. Marsh soils and vegetation were sampled along an elevation...
Authors
Rachel Van Allen, Kathryn M. Schreiner, Glenn Guntenspergen, Joseph A. Carlin
Coastal marsh degradation into ponds induces irreversible elevation loss relative to sea level
Coastal marshes and their valuable ecosystem services are feared to be lost by sea level rise, yet the mechanisms of marsh degradation into ponds and potential recovery are poorly understood. We quantified and analyzed elevations of marsh surfaces and pond bottoms along a marsh loss gradient (Blackwater River, Maryland, USA). Our analyses show that ponds deepen with increasing tidal...
Authors
Lennert Schepers, Patrick Brennand, Matthew L. Kirwan, Glenn Guntenspergen, Stijn Temmerman
Modelling marsh-forest boundary transgression in response to storms and sea-level rise
The lateral extent and vertical stability of salt marshes experiencing rising sea levels depend on interacting drivers and feedbacks with potential for non‐linear behaviors. A two‐dimensional transect model was developed to examine changes in marsh and upland forest lateral extent and to explore controls on marsh inland transgression. Model behavior demonstrates limited and abrupt forest...
Authors
Joel Carr, Glenn Guntenspergen, Matthew L. Kirwan
Hurricane Sandy effects on coastal marsh elevation change
High-magnitude storm events such as Hurricane Sandy are powerful agents of geomorphic change in coastal marshes, potentially altering their surface elevation trajectories. But how do a storm’s impacts vary across a large region spanning a variety of wetland settings and storm exposures and intensities. We determined the short-term impacts of Hurricane Sandy at 223 surface elevation table...
Authors
Alice G. Yeates, James B. Grace, Jennifer H. Olker, Glenn Guntenspergen, Donald R. Cahoon, Susan C. Adamowicz, Shimon C. Anisfeld, Nels Barrett, Alice Benzecry, Linda K. Blum, Rober T Christian, Joseph Grzyb, Ellen Kracauer Hartig, Kelly Hines Leo, Scott Lerberg, James F. Lynch, Nicole Maher, J. Patrick Megonigal, William G. Reay, Drexel Siok, Adam Starke, Vincent Turner, Scott Warren
Evaluating indicators of marsh vulnerability to sea level rise along a historical marsh loss gradient
Sea level rise (SLR) is threatening coastal marshes, leading to large‐scale marsh loss in several micro‐tidal systems. Early recognition of marsh vulnerability to SLR is critical in these systems to aid managers to take appropriate restoration or mitigation measures. However, it is not clear if current marsh vulnerability indicators correctly assess long‐term stability of the marsh...
Authors
Lennert Schepers, Matthew L. Kirwan, Glenn Guntenspergen, Stijn Temmerman
Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay
Understanding habitat associations is vital for conservation of at‐risk marsh‐endemic wildlife species, particularly those under threat from sea level rise. We modeled environmental and habitat associations of the marsh‐endemic, Federally endangered salt marsh harvest mouse (Reithrodontomys raviventris, RERA) and co‐occurrence with eight associated small mammal species from annual trap...
Authors
Bruce G. Marcot, Isa Woo PR, Karen M. Thorne, Chase M. Freeman, Glenn Guntenspergen
When portfolio theory can help environmental investment planning to reduce climate risk to future environmental outcomes - and when it cannot
Variability among climate change scenarios produces great uncertainty in what is the best allocation of resources among investments to protect environmental goods in the future. Previous research shows Modern Portfolio Theory (MPT) can help optimize environmental investment targeting to reduce outcome risk with minimal loss of expected level of environmental benefits, but no work has yet...
Authors
Amy W. Ando, Jennifer M. Fraterrigo, Glenn Guntenspergen, Aparna Howlader, Mindy L. Mallory, Jennifer H. Olker, Samuel Stickley
Understanding tidal marsh trajectories: Evaluation of multiple indicators of marsh persistence
Robust assessments of ecosystem stability are critical for informing conservation and management decisions. Tidal marsh ecosystems provide vital services, yet are globally threatened by anthropogenic alterations to physical and biological processes. A variety of monitoring and modeling approaches have been undertaken to determine which tidal marshes are likely to persist into the future...
Authors
Kerstin Wasson, Neil Kamal Ganju, Zafer Defne, Charlie Endris, Tracy Elsey-Quirk, Karen M. Thorne, Chase M. Freeman, Glenn Guntenspergen, Daniel J. Nowacki, Kenneth B. Raposa
Thin-layer sediment addition to an existing salt marsh to combat sea-level rise and improve endangered species habitat in California, USA
Current tidal marsh elevations and their accretion rates are important predictors of vulnerability to sea-level rise. When tidal marshes are at risk, adaptation measures, such as sediment addition to increase elevations, can be implemented to prevent degradation and loss. In 2016, wildlife managers prescribed a thin-layer sediment addition of locally sourced dredged material from Anaheim...
Authors
Karen M. Thorne, Chase M. Freeman, Jordan Rosencranz, Neil Kamal Ganju, Glenn Guntenspergen
Hurricane Sandy impacts on coastal wetland resilience
The goal of this research was to evaluate the impacts of Hurricane Sandy on surface elevation trends in estuarine marshes located across the northeast region of the United States from Virginia to Maine using data from an opportunistic (in other words, not strategic) and collaborative network (from here on, an opportunistic network) of surface elevation table-marker horizon (SET-MH)...
Authors
Donald R. Cahoon, Jennifer H. Olker, Alice G. Yeates, Glenn Guntenspergen, James B. Grace, Susan C. Adamowicz, Shimon C. Anisfeld, Andrew H. Baldwin, Nels Barrett, Leah Beckett, Alice Benzecry, Linda K. Blum, David M. Burdick, William Crouch, Marci Cole Ekberg, Sarah Fernald, Kristin Wilson Grimes, Joseph Grzyb, Ellen Kracauer Hartig, Danielle A. Kreeger, Marit Larson, Scott Lerberg, James F. Lynch, Nicole Maher, Martha Maxwell-Doyle, Laura R. Mitchell, Jordan Mora, Victoria O'Neill, Angela Padeletti, Diann Prosser, Tracy Quirk, Kenneth B. Raposa, William G. Reay, Drexel Siok, Christopher Snow, Adam Starke, J. Court Stevenson, Lorie W. Staver, Vincent Turner
Simulating the effects of climate variability on waterbodies and wetland-dependent birds in the Prairie Pothole Region
Understanding how bird populations respond to changes in waterbody availability in the climatically variable Prairie Pothole Region (PPR) of North America hinges on being able to couple hydrological and climate modeling to represent potential future landscapes. Model experiments run with the Pothole Complex Hydrologic Model using downscaled climate data (variables relating to...
Authors
N.E. Mcintyre, G. Liu, Jessica M. Gorzo, C.K. Wright, Glenn Guntenspergen, F. Schwartz
Science and Products
Filter Total Items: 16
No Result Found
Filter Total Items: 128
Experimental tree mortality does not induce marsh transgression in a Chesapeake Bay low-lying coastal forest
Transgression into adjacent uplands is an important global response of coastal wetlands to accelerated rates of sea level rise. “Ghost forests” mark a signature characteristic of marsh transgression on the landscape, as changes in tidal inundation and salinity cause bordering upland tree mortality, increase light availability, and the emergence of tidal marsh species due to reduced...
Authors
David C Walters, Joel Carr, Alyssa Hockaday, Joshua A Jones, Eliza McFarland, Katya Kovalenko, Matthew L. Kirwan, Donald R. Cahoon, Glenn Guntenspergen
Changes in organic carbon source and storage with sea level rise-induced transgression in a Chesapeake Bay marsh
Organic matter (OM) accumulation in marsh soils affects marsh survival under rapid sea-level rise (SLR). This work describes the changing organic geochemistry of a salt marsh located in the Blackwater National Wildlife Refuge on the eastern shore of Chesapeake Bay that has transgressed inland with SLR over the past 35–75 years. Marsh soils and vegetation were sampled along an elevation...
Authors
Rachel Van Allen, Kathryn M. Schreiner, Glenn Guntenspergen, Joseph A. Carlin
Coastal marsh degradation into ponds induces irreversible elevation loss relative to sea level
Coastal marshes and their valuable ecosystem services are feared to be lost by sea level rise, yet the mechanisms of marsh degradation into ponds and potential recovery are poorly understood. We quantified and analyzed elevations of marsh surfaces and pond bottoms along a marsh loss gradient (Blackwater River, Maryland, USA). Our analyses show that ponds deepen with increasing tidal...
Authors
Lennert Schepers, Patrick Brennand, Matthew L. Kirwan, Glenn Guntenspergen, Stijn Temmerman
Modelling marsh-forest boundary transgression in response to storms and sea-level rise
The lateral extent and vertical stability of salt marshes experiencing rising sea levels depend on interacting drivers and feedbacks with potential for non‐linear behaviors. A two‐dimensional transect model was developed to examine changes in marsh and upland forest lateral extent and to explore controls on marsh inland transgression. Model behavior demonstrates limited and abrupt forest...
Authors
Joel Carr, Glenn Guntenspergen, Matthew L. Kirwan
Hurricane Sandy effects on coastal marsh elevation change
High-magnitude storm events such as Hurricane Sandy are powerful agents of geomorphic change in coastal marshes, potentially altering their surface elevation trajectories. But how do a storm’s impacts vary across a large region spanning a variety of wetland settings and storm exposures and intensities. We determined the short-term impacts of Hurricane Sandy at 223 surface elevation table...
Authors
Alice G. Yeates, James B. Grace, Jennifer H. Olker, Glenn Guntenspergen, Donald R. Cahoon, Susan C. Adamowicz, Shimon C. Anisfeld, Nels Barrett, Alice Benzecry, Linda K. Blum, Rober T Christian, Joseph Grzyb, Ellen Kracauer Hartig, Kelly Hines Leo, Scott Lerberg, James F. Lynch, Nicole Maher, J. Patrick Megonigal, William G. Reay, Drexel Siok, Adam Starke, Vincent Turner, Scott Warren
Evaluating indicators of marsh vulnerability to sea level rise along a historical marsh loss gradient
Sea level rise (SLR) is threatening coastal marshes, leading to large‐scale marsh loss in several micro‐tidal systems. Early recognition of marsh vulnerability to SLR is critical in these systems to aid managers to take appropriate restoration or mitigation measures. However, it is not clear if current marsh vulnerability indicators correctly assess long‐term stability of the marsh...
Authors
Lennert Schepers, Matthew L. Kirwan, Glenn Guntenspergen, Stijn Temmerman
Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay
Understanding habitat associations is vital for conservation of at‐risk marsh‐endemic wildlife species, particularly those under threat from sea level rise. We modeled environmental and habitat associations of the marsh‐endemic, Federally endangered salt marsh harvest mouse (Reithrodontomys raviventris, RERA) and co‐occurrence with eight associated small mammal species from annual trap...
Authors
Bruce G. Marcot, Isa Woo PR, Karen M. Thorne, Chase M. Freeman, Glenn Guntenspergen
When portfolio theory can help environmental investment planning to reduce climate risk to future environmental outcomes - and when it cannot
Variability among climate change scenarios produces great uncertainty in what is the best allocation of resources among investments to protect environmental goods in the future. Previous research shows Modern Portfolio Theory (MPT) can help optimize environmental investment targeting to reduce outcome risk with minimal loss of expected level of environmental benefits, but no work has yet...
Authors
Amy W. Ando, Jennifer M. Fraterrigo, Glenn Guntenspergen, Aparna Howlader, Mindy L. Mallory, Jennifer H. Olker, Samuel Stickley
Understanding tidal marsh trajectories: Evaluation of multiple indicators of marsh persistence
Robust assessments of ecosystem stability are critical for informing conservation and management decisions. Tidal marsh ecosystems provide vital services, yet are globally threatened by anthropogenic alterations to physical and biological processes. A variety of monitoring and modeling approaches have been undertaken to determine which tidal marshes are likely to persist into the future...
Authors
Kerstin Wasson, Neil Kamal Ganju, Zafer Defne, Charlie Endris, Tracy Elsey-Quirk, Karen M. Thorne, Chase M. Freeman, Glenn Guntenspergen, Daniel J. Nowacki, Kenneth B. Raposa
Thin-layer sediment addition to an existing salt marsh to combat sea-level rise and improve endangered species habitat in California, USA
Current tidal marsh elevations and their accretion rates are important predictors of vulnerability to sea-level rise. When tidal marshes are at risk, adaptation measures, such as sediment addition to increase elevations, can be implemented to prevent degradation and loss. In 2016, wildlife managers prescribed a thin-layer sediment addition of locally sourced dredged material from Anaheim...
Authors
Karen M. Thorne, Chase M. Freeman, Jordan Rosencranz, Neil Kamal Ganju, Glenn Guntenspergen
Hurricane Sandy impacts on coastal wetland resilience
The goal of this research was to evaluate the impacts of Hurricane Sandy on surface elevation trends in estuarine marshes located across the northeast region of the United States from Virginia to Maine using data from an opportunistic (in other words, not strategic) and collaborative network (from here on, an opportunistic network) of surface elevation table-marker horizon (SET-MH)...
Authors
Donald R. Cahoon, Jennifer H. Olker, Alice G. Yeates, Glenn Guntenspergen, James B. Grace, Susan C. Adamowicz, Shimon C. Anisfeld, Andrew H. Baldwin, Nels Barrett, Leah Beckett, Alice Benzecry, Linda K. Blum, David M. Burdick, William Crouch, Marci Cole Ekberg, Sarah Fernald, Kristin Wilson Grimes, Joseph Grzyb, Ellen Kracauer Hartig, Danielle A. Kreeger, Marit Larson, Scott Lerberg, James F. Lynch, Nicole Maher, Martha Maxwell-Doyle, Laura R. Mitchell, Jordan Mora, Victoria O'Neill, Angela Padeletti, Diann Prosser, Tracy Quirk, Kenneth B. Raposa, William G. Reay, Drexel Siok, Christopher Snow, Adam Starke, J. Court Stevenson, Lorie W. Staver, Vincent Turner
Simulating the effects of climate variability on waterbodies and wetland-dependent birds in the Prairie Pothole Region
Understanding how bird populations respond to changes in waterbody availability in the climatically variable Prairie Pothole Region (PPR) of North America hinges on being able to couple hydrological and climate modeling to represent potential future landscapes. Model experiments run with the Pothole Complex Hydrologic Model using downscaled climate data (variables relating to...
Authors
N.E. Mcintyre, G. Liu, Jessica M. Gorzo, C.K. Wright, Glenn Guntenspergen, F. Schwartz