Glenn Guntenspergen, Ph.D.
Glenn is a Research Ecologist at the Eastern Ecological Science Center in Laurel, MD.
Science and Products
Filter Total Items: 116
The Blackwater NWR inundation model. Rising sea level on a low-lying coast: land use planning for wetlands
The Blackwater National Wildlife Refuge (BNWR), on the Eastern Shore of Chesapeake Bay (figure 1), occupies an area less than 1 meter above sea level. The Refuge has been featured prominently in studies of the impact of sea level rise on coastal wetlands. Most notably, the refuge has been sited by the Intergovernmental Panel on Climate Change (IPCC) as a key example of 'wetland loss' attributable
Authors
Curt Larsen, Inga E. Clark, Glenn Guntenspergen, Don Cahoon, Vincent Caruso, Cliff Hupp, Tom Yanosky
Seasonal methane emissions by diffusion and ebullition from oligohaline marsh environments in coastal Louisiana
Methane is an important atmospheric greenhouse gas that is emitted from many natural and anthropogenic sources. In order to evaluate the global methane budget, precise data are needed from the diverse sources including coastal wetlands. Over 100 time-series determinations of methane emissions from an oligohaline wetland (brackish marsh) in coastal Louisiana show large variability during five seaso
Authors
Joel S. Leventhal, Glenn R. Guntenspergen
An integrated analysis of the effects of past land use on forest herb colonization at the landscape scale
A framework that summarizes the direct and indirect effects of past land use on forest herb recolonization is proposed, and used to analyse the colonization patterns of forest understorey herbaceous species in a 360-ha mixed forest, grassland and arable landscape in the Dijle river valley (central Belgium).Fine-scale distribution maps were constructed for 14 species. The species were mapped in 15
Authors
K. Verheyen, Glenn R. Guntenspergen, B. Biesbrouck, M. Hermy
Preface: Phragmites australis: A sheep in wolf's clothing?
A. problem with national priorities for control or prevention of aquatic nuisance species is that we often do not know the full extent of the problem, if there is one. To address this issue, we hosted a technical forum and workshop-Phragmites australis: A Sheep in Wolf's Clothing?--with a focus on new research and critical reviews that address the role of Phragmites as a noxious weed. ... The Wor
Authors
M.P. Weinstein, J.R. Keough, G.R. Guntenspergen, S.Y. Litvin
Differences in distribution of modified basins and ducks relative to roadside transects
Wetland basins in the Prairie Pothole Region of the U.S. are commonly modified by excavation (e.g., roadside ditches, stock dugouts), partial drainage (ditching), and diking. Differences in the distribution of modified wetlands may affect the predictive accuracy of waterfowl survey data if such wetlands are not distributed randomly in the landscape and if waterfowl are not distributed equally am
Authors
Jane E. Austin, Glenn R. Guntenspergen, H. Thomas Sklebar, T.K. Buhl
Preface: Phragmites australis - A Sheep in Wolf's Clothing?
[No abstract available]
Authors
M.P. Weinstein, J.R. Keough, G.R. Guntenspergen, S.Y. Litvin
Narrowing historical uncertainty: probabilistic classification of ambiguously identified tree species in historical forest survey data
Historical data have increasingly become appreciated for insight into the past conditions of ecosystems. Uses of such data include assessing the extent of ecosystem change; deriving ecological baselines for management, restoration, and modeling; and assessing the importance of past conditions on the composition and function of current systems. One historical data set of this type is the Public L
Authors
D.J. Mladenoff, S.E. Dahir, E.V. Nordheim, L.A. Schulte, G.R. Guntenspergen
Indicators of wetland condition for the Prairie Pothole Region of the United States
We describe a study designed to evaluate the performance ofwetland condition indicators of the Prairie Pothole Region (PPR)of the north central United States. Basin and landscape scaleindicators were tested in 1992 and 1993 to determine theirability to discriminate between the influences of grasslanddominated and cropland dominated landscapes in the PPR. Pairedplots were selected from each of the
Authors
Glenn R. Guntenspergen, S.A. Peterson, S.G. Leibowitz, L.M. Cowardin
Duck populations as indicators of landscape condition in the Prairie Pothole Region
The Prairie Pothole Region of the northern Great Plains is an important region for waterfowl production because of the abundance of shallow wetlands. The ecological significance of the region and impacts from intensive agriculture prompted the U.S. Environmental Protection Agency to select it as one of the first areas for developing and evaluating ecological indicators of wetland condition. We exa
Authors
Jane E. Austin, Thomas K. Buhl, Glenn R. Guntenspergen, Wayne Norling, H. Thomas Sklebar
GIS interpolations of witness tree records (1839-1866) for northern Wisconsin at multiple scales
To construct forest landscape of pre-European settlement periods, we developed a GIS interpolation approach to convert witness tree records of the U.S. General Land Office (GLO) survey from point to polygon data, which better described continuously distributed vegetation. The witness tree records (1839-1866) were processed for a 3-million ha landscape in northern Wisconsin, U.S.A. at different sca
Authors
H.S. He, D.J. Mladenoff, T.A. Sickley, G.R. Guntenspergen
Effects of roadside transect width on waterfowl and wetland estimates
Strip transects located along roads are commonly used to estimate waterfowl populations and characterize associated wetland habitat. We used data collected in May and early June, 1995, on forty-five 40-km2 plots in North Dakota to evaluate bias of 800-m and 400-m wide roadside transects for sampling wetlands relative to a larger (40-km2) scale and to compare duck abundance at the two widths. Densi
Authors
Jane E. Austin, H. Thomas Sklebar, Glenn R. Guntenspergen, Thomas K. Buhl
The effects of landscape position on plant species density: Evidence of past environmental effects in a coastal wetland
Here we propose that an important cause of variation in species density may be prior environmental conditions that continue to influence current patterns. In this paper we investigated the degree to which species density varies with location within the landscape, independent of contemporaneous environmental conditions. The area studied was a coastal marsh landscape subject to periodic storm even
Authors
J.B. Grace, G.R. Guntenspergen
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Filter Total Items: 116
The Blackwater NWR inundation model. Rising sea level on a low-lying coast: land use planning for wetlands
The Blackwater National Wildlife Refuge (BNWR), on the Eastern Shore of Chesapeake Bay (figure 1), occupies an area less than 1 meter above sea level. The Refuge has been featured prominently in studies of the impact of sea level rise on coastal wetlands. Most notably, the refuge has been sited by the Intergovernmental Panel on Climate Change (IPCC) as a key example of 'wetland loss' attributableAuthorsCurt Larsen, Inga E. Clark, Glenn Guntenspergen, Don Cahoon, Vincent Caruso, Cliff Hupp, Tom YanoskySeasonal methane emissions by diffusion and ebullition from oligohaline marsh environments in coastal Louisiana
Methane is an important atmospheric greenhouse gas that is emitted from many natural and anthropogenic sources. In order to evaluate the global methane budget, precise data are needed from the diverse sources including coastal wetlands. Over 100 time-series determinations of methane emissions from an oligohaline wetland (brackish marsh) in coastal Louisiana show large variability during five seasoAuthorsJoel S. Leventhal, Glenn R. GuntenspergenAn integrated analysis of the effects of past land use on forest herb colonization at the landscape scale
A framework that summarizes the direct and indirect effects of past land use on forest herb recolonization is proposed, and used to analyse the colonization patterns of forest understorey herbaceous species in a 360-ha mixed forest, grassland and arable landscape in the Dijle river valley (central Belgium).Fine-scale distribution maps were constructed for 14 species. The species were mapped in 15AuthorsK. Verheyen, Glenn R. Guntenspergen, B. Biesbrouck, M. HermyPreface: Phragmites australis: A sheep in wolf's clothing?
A. problem with national priorities for control or prevention of aquatic nuisance species is that we often do not know the full extent of the problem, if there is one. To address this issue, we hosted a technical forum and workshop-Phragmites australis: A Sheep in Wolf's Clothing?--with a focus on new research and critical reviews that address the role of Phragmites as a noxious weed. ... The WorAuthorsM.P. Weinstein, J.R. Keough, G.R. Guntenspergen, S.Y. LitvinDifferences in distribution of modified basins and ducks relative to roadside transects
Wetland basins in the Prairie Pothole Region of the U.S. are commonly modified by excavation (e.g., roadside ditches, stock dugouts), partial drainage (ditching), and diking. Differences in the distribution of modified wetlands may affect the predictive accuracy of waterfowl survey data if such wetlands are not distributed randomly in the landscape and if waterfowl are not distributed equally amAuthorsJane E. Austin, Glenn R. Guntenspergen, H. Thomas Sklebar, T.K. BuhlPreface: Phragmites australis - A Sheep in Wolf's Clothing?
[No abstract available]AuthorsM.P. Weinstein, J.R. Keough, G.R. Guntenspergen, S.Y. LitvinNarrowing historical uncertainty: probabilistic classification of ambiguously identified tree species in historical forest survey data
Historical data have increasingly become appreciated for insight into the past conditions of ecosystems. Uses of such data include assessing the extent of ecosystem change; deriving ecological baselines for management, restoration, and modeling; and assessing the importance of past conditions on the composition and function of current systems. One historical data set of this type is the Public LAuthorsD.J. Mladenoff, S.E. Dahir, E.V. Nordheim, L.A. Schulte, G.R. GuntenspergenIndicators of wetland condition for the Prairie Pothole Region of the United States
We describe a study designed to evaluate the performance ofwetland condition indicators of the Prairie Pothole Region (PPR)of the north central United States. Basin and landscape scaleindicators were tested in 1992 and 1993 to determine theirability to discriminate between the influences of grasslanddominated and cropland dominated landscapes in the PPR. Pairedplots were selected from each of theAuthorsGlenn R. Guntenspergen, S.A. Peterson, S.G. Leibowitz, L.M. CowardinDuck populations as indicators of landscape condition in the Prairie Pothole Region
The Prairie Pothole Region of the northern Great Plains is an important region for waterfowl production because of the abundance of shallow wetlands. The ecological significance of the region and impacts from intensive agriculture prompted the U.S. Environmental Protection Agency to select it as one of the first areas for developing and evaluating ecological indicators of wetland condition. We exaAuthorsJane E. Austin, Thomas K. Buhl, Glenn R. Guntenspergen, Wayne Norling, H. Thomas SklebarGIS interpolations of witness tree records (1839-1866) for northern Wisconsin at multiple scales
To construct forest landscape of pre-European settlement periods, we developed a GIS interpolation approach to convert witness tree records of the U.S. General Land Office (GLO) survey from point to polygon data, which better described continuously distributed vegetation. The witness tree records (1839-1866) were processed for a 3-million ha landscape in northern Wisconsin, U.S.A. at different scaAuthorsH.S. He, D.J. Mladenoff, T.A. Sickley, G.R. GuntenspergenEffects of roadside transect width on waterfowl and wetland estimates
Strip transects located along roads are commonly used to estimate waterfowl populations and characterize associated wetland habitat. We used data collected in May and early June, 1995, on forty-five 40-km2 plots in North Dakota to evaluate bias of 800-m and 400-m wide roadside transects for sampling wetlands relative to a larger (40-km2) scale and to compare duck abundance at the two widths. DensiAuthorsJane E. Austin, H. Thomas Sklebar, Glenn R. Guntenspergen, Thomas K. BuhlThe effects of landscape position on plant species density: Evidence of past environmental effects in a coastal wetland
Here we propose that an important cause of variation in species density may be prior environmental conditions that continue to influence current patterns. In this paper we investigated the degree to which species density varies with location within the landscape, independent of contemporaneous environmental conditions. The area studied was a coastal marsh landscape subject to periodic storm evenAuthorsJ.B. Grace, G.R. Guntenspergen - News