Glenn Guntenspergen, Ph.D.
Glenn is a Research Ecologist at the Eastern Ecological Science Center in Laurel, MD.
Science and Products
Filter Total Items: 117
Climate trends of the North American prairie pothole region 1906-2000
The Prairie Pothole Region (PPR) is unique to North America. Its millions of wetlands and abundant ecosystem goods and services are highly sensitive to wide variations of temperature and precipitation in time and space characteristic of a strongly continental climate. Precipitation and temperature gradients across the PPR are orthogonal to each other. Precipitation nearly triples from west to east
Authors
B. Millett, W.C. Johnson, G. Guntenspergen
Adaptation of farming practices could buffer effects of climate change on northern prairie wetlands
Wetlands of the Prairie Pothole Region of North America are vulnerable to climate change. Adaptation of farming practices to mitigate adverse impacts of climate change on wetland water levels is a potential watershed management option. We chose a modeling approach (WETSIM 3.2) to examine the effects of changes in climate and watershed cover on the water levels of a semi-permanent wetland in easter
Authors
R.A. Voldseth, W.C. Johnson, G.R. Guntenspergen, T. Gilmanov, B.V. Millett
Latitudinal trends in Spartina alterniflora productivity and the response of coastal marshes to global change
Marshes worldwide are actively degrading in response to increased sea level rise rates and reduced sediment delivery, though the growth rate of vegetation plays a critical role in determining their stability. We have compiled 56 measurements of above-ground annual productivity for Spartina alterniflora, the dominant macrophyte in North American coastal wetlands. Our compilation indicates a signi
Authors
Matthew L. Kirwan, Glenn R. Guntenspergen, James T. Morris
Effect of climate fluctuations on long-term vegetation dynamics in Carolina bay wetlands
Carolina bays and similar depression wetlands of the U.S. Southeastern Coastal Plain have hydrologic regimes that are driven primarily by rainfall. Therefore, climate fluctuations such as drought cycles have the potential to shape long-term vegetation dynamics. Models suggest two potential long-term responses to hydrologic fluctuations, either cyclic change maintaining open emergent vegetation,
Authors
C.L. Stroh, D. De Steven, G.R. Guntenspergen
Model estimation of land-use effects on water levels of northern Prairie wetlands
Wetlands of the Prairie Pothole Region exist in a matrix of grassland dominated by intensive pastoral and cultivation agriculture. Recent conservation management has emphasized the conversion of cultivated farmland and degraded pastures to intact grassland to improve upland nesting habitat. The consequences of changes in land-use cover that alter watershed processes have not been evaluated relat
Authors
R.A. Voldseth, W.C. Johnson, T. Gilmanov, G.R. Guntenspergen, B.V. Millett
The impact of invasive plants on tidal-marsh vertebrate species: common reed (Phragmites australis) and smooth cordgrass (Spartina alterniflora) as case studies
Large areas of tidal marsh in the contiguous US and the Maritime Provinces of Canada are threatened by invasive plant species. Our understanding of the impact these invasions have on tidal-marsh vertebrates is sparse. In this paper, we focus on two successful invasive plant taxa that have spread outside their native range --common reed (Phragmites australis) and smooth cordgrass (Spartina a/tern
Authors
Glenn R. Guntenspergen, J. Cully Nordby
Salt tolerance and osmotic adjustment of Spartina alterniflora (Poaceae) and the invasive M haplotype of Phragmites australis (Poaceae) along a salinity gradient
An invasive variety of Phragmites australis (Poaceae, common reed), the M haplotype, has been implicated in the spread of this species into North American salt marshes that are normally dominated by the salt marsh grass Spartina alterniflora (Poaceae, smooth cordgrass). In some European marshes, on the other hand, Spartina spp. derived from S. alterniflora have spread into brackish P. australis ma
Authors
Edward A. Vasquez, Edward P. Glenn, Glenn R. Guntenspergen, J. Jed Brown, Stephen G. Nelson
Predicting the persistence of coastal wetlands to global change stressors
Despite progress toward understanding the response of coastal wetlands to increases in relative sea-level rise and an improved understanding of the effect of elevated CO2 on plant species allocation patterns, we are limited in our ability to predict the response of coastal wetlands to the effects associated with global change. Static simulations of the response of coastal wetlands to sea-level ri
Authors
G. Guntenspergen, Karen McKee, D. Cahoon, J. Grace, P. Megonigal
Fine-scale spatial variation in plant species richness and its relationship to environmental conditions in coastal marshlands
Previous studies have shown that variations in environmental conditions play a major role in explaining variations in plant species richness at community and landscape scales. In this study, we considered the degree to which fine-scale spatial variations in richness could be related to fine-scale variations in abiotic and biotic factors. To examine spatial variation in richness, grids of 1 m2 plot
Authors
J.E. Mancera, G.C. Meche, P.P. Cardona-Olarte, E. Castaneda-Moya, R.L. Chiasson, N.A. Geddes, L.M. Schile, H.G. Wang, G.R. Guntenspergen, J.B. Grace
Salt tolerance underlies the cryptic invasion of North American salt marshes by an introduced haplotype of the common reed Phragmites australis (Poaceae)
A distinct, non-native haplotype of the common reed Phragmites australis has become invasive in Atlantic coastal Spartina marshes. We compared the salt tolerance and other growth characteristics of the invasive M haplotype with 2 native haplotypes (F and AC) in greenhouse experiments. The M haplotype retained 50% of its growth potential up to 0.4 M NaCl, whereas the F and AC haplotypes did not gro
Authors
Edward A. Vasquez, Edward P. Glenn, J. Jed Brown, Glenn R. Guntenspergen, Stephen G. Nelson
Vulnerability of northern prairie wetlands to climate change
The prairie pothole region (PPR) lies in the heart of North America and contains millions of glacially formed, depressional wetlands embedded in a landscape matrix of natural grassland and agriculture. These wetlands provide valuable ecosystem services and produce 50% to 80% of the continent's ducks. We explored the broad spatial and temporal patterns across the PPR between climate and wetland w
Authors
W. Carter Johnson, Bruce Millett, Tagir Gilmanov, Richard A. Voldseth, Glenn R. Guntenspergen, David E. Naugle
Using hydrogeomorphic criteria to classify wetlands on Mt. Desert Island, Maine – Approach, classification system, and examples
A wetland classification system was designed for Mt. Desert Island, Maine, to help categorize the large number of wetlands (over 1,200 mapped units) as an aid to understanding their hydrologic functions. The classification system, developed by the U.S. Geological Survey (USGS), in cooperation with the National Park Service, uses a modified hydrogeomorphic (HGM) approach, and assigns categories bas
Authors
Martha G. Nielsen, Glenn R. Guntenspergen, Hilary A. Neckles
Science and Products
Filter Total Items: 117
Climate trends of the North American prairie pothole region 1906-2000
The Prairie Pothole Region (PPR) is unique to North America. Its millions of wetlands and abundant ecosystem goods and services are highly sensitive to wide variations of temperature and precipitation in time and space characteristic of a strongly continental climate. Precipitation and temperature gradients across the PPR are orthogonal to each other. Precipitation nearly triples from west to east
Authors
B. Millett, W.C. Johnson, G. Guntenspergen
Adaptation of farming practices could buffer effects of climate change on northern prairie wetlands
Wetlands of the Prairie Pothole Region of North America are vulnerable to climate change. Adaptation of farming practices to mitigate adverse impacts of climate change on wetland water levels is a potential watershed management option. We chose a modeling approach (WETSIM 3.2) to examine the effects of changes in climate and watershed cover on the water levels of a semi-permanent wetland in easter
Authors
R.A. Voldseth, W.C. Johnson, G.R. Guntenspergen, T. Gilmanov, B.V. Millett
Latitudinal trends in Spartina alterniflora productivity and the response of coastal marshes to global change
Marshes worldwide are actively degrading in response to increased sea level rise rates and reduced sediment delivery, though the growth rate of vegetation plays a critical role in determining their stability. We have compiled 56 measurements of above-ground annual productivity for Spartina alterniflora, the dominant macrophyte in North American coastal wetlands. Our compilation indicates a signi
Authors
Matthew L. Kirwan, Glenn R. Guntenspergen, James T. Morris
Effect of climate fluctuations on long-term vegetation dynamics in Carolina bay wetlands
Carolina bays and similar depression wetlands of the U.S. Southeastern Coastal Plain have hydrologic regimes that are driven primarily by rainfall. Therefore, climate fluctuations such as drought cycles have the potential to shape long-term vegetation dynamics. Models suggest two potential long-term responses to hydrologic fluctuations, either cyclic change maintaining open emergent vegetation,
Authors
C.L. Stroh, D. De Steven, G.R. Guntenspergen
Model estimation of land-use effects on water levels of northern Prairie wetlands
Wetlands of the Prairie Pothole Region exist in a matrix of grassland dominated by intensive pastoral and cultivation agriculture. Recent conservation management has emphasized the conversion of cultivated farmland and degraded pastures to intact grassland to improve upland nesting habitat. The consequences of changes in land-use cover that alter watershed processes have not been evaluated relat
Authors
R.A. Voldseth, W.C. Johnson, T. Gilmanov, G.R. Guntenspergen, B.V. Millett
The impact of invasive plants on tidal-marsh vertebrate species: common reed (Phragmites australis) and smooth cordgrass (Spartina alterniflora) as case studies
Large areas of tidal marsh in the contiguous US and the Maritime Provinces of Canada are threatened by invasive plant species. Our understanding of the impact these invasions have on tidal-marsh vertebrates is sparse. In this paper, we focus on two successful invasive plant taxa that have spread outside their native range --common reed (Phragmites australis) and smooth cordgrass (Spartina a/tern
Authors
Glenn R. Guntenspergen, J. Cully Nordby
Salt tolerance and osmotic adjustment of Spartina alterniflora (Poaceae) and the invasive M haplotype of Phragmites australis (Poaceae) along a salinity gradient
An invasive variety of Phragmites australis (Poaceae, common reed), the M haplotype, has been implicated in the spread of this species into North American salt marshes that are normally dominated by the salt marsh grass Spartina alterniflora (Poaceae, smooth cordgrass). In some European marshes, on the other hand, Spartina spp. derived from S. alterniflora have spread into brackish P. australis ma
Authors
Edward A. Vasquez, Edward P. Glenn, Glenn R. Guntenspergen, J. Jed Brown, Stephen G. Nelson
Predicting the persistence of coastal wetlands to global change stressors
Despite progress toward understanding the response of coastal wetlands to increases in relative sea-level rise and an improved understanding of the effect of elevated CO2 on plant species allocation patterns, we are limited in our ability to predict the response of coastal wetlands to the effects associated with global change. Static simulations of the response of coastal wetlands to sea-level ri
Authors
G. Guntenspergen, Karen McKee, D. Cahoon, J. Grace, P. Megonigal
Fine-scale spatial variation in plant species richness and its relationship to environmental conditions in coastal marshlands
Previous studies have shown that variations in environmental conditions play a major role in explaining variations in plant species richness at community and landscape scales. In this study, we considered the degree to which fine-scale spatial variations in richness could be related to fine-scale variations in abiotic and biotic factors. To examine spatial variation in richness, grids of 1 m2 plot
Authors
J.E. Mancera, G.C. Meche, P.P. Cardona-Olarte, E. Castaneda-Moya, R.L. Chiasson, N.A. Geddes, L.M. Schile, H.G. Wang, G.R. Guntenspergen, J.B. Grace
Salt tolerance underlies the cryptic invasion of North American salt marshes by an introduced haplotype of the common reed Phragmites australis (Poaceae)
A distinct, non-native haplotype of the common reed Phragmites australis has become invasive in Atlantic coastal Spartina marshes. We compared the salt tolerance and other growth characteristics of the invasive M haplotype with 2 native haplotypes (F and AC) in greenhouse experiments. The M haplotype retained 50% of its growth potential up to 0.4 M NaCl, whereas the F and AC haplotypes did not gro
Authors
Edward A. Vasquez, Edward P. Glenn, J. Jed Brown, Glenn R. Guntenspergen, Stephen G. Nelson
Vulnerability of northern prairie wetlands to climate change
The prairie pothole region (PPR) lies in the heart of North America and contains millions of glacially formed, depressional wetlands embedded in a landscape matrix of natural grassland and agriculture. These wetlands provide valuable ecosystem services and produce 50% to 80% of the continent's ducks. We explored the broad spatial and temporal patterns across the PPR between climate and wetland w
Authors
W. Carter Johnson, Bruce Millett, Tagir Gilmanov, Richard A. Voldseth, Glenn R. Guntenspergen, David E. Naugle
Using hydrogeomorphic criteria to classify wetlands on Mt. Desert Island, Maine – Approach, classification system, and examples
A wetland classification system was designed for Mt. Desert Island, Maine, to help categorize the large number of wetlands (over 1,200 mapped units) as an aid to understanding their hydrologic functions. The classification system, developed by the U.S. Geological Survey (USGS), in cooperation with the National Park Service, uses a modified hydrogeomorphic (HGM) approach, and assigns categories bas
Authors
Martha G. Nielsen, Glenn R. Guntenspergen, Hilary A. Neckles