James Grace, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 188
Comparing groups using structural equations Comparing groups using structural equations
No abstract available.
Authors
James B. Grace
Examining the relationship between environmental variables and ordination axes using latent variables and structural equation modelling Examining the relationship between environmental variables and ordination axes using latent variables and structural equation modelling
No abstract available
Authors
James B. Grace
Effects of disturbance on germination and seedling establishment in a coastal prairie grassland: A test of the competitive release hypothesis Effects of disturbance on germination and seedling establishment in a coastal prairie grassland: A test of the competitive release hypothesis
1. We evaluated the responses of native grassland sods to a variety of types of disturbance in order to assess hypotheses about the competitive effects of established vegetation on seed germination and seedling establishment. In particular, we consider whether germination is more responsive to the magnitude and duration of vegetation removal (competitive release) or to individual...
Authors
H.M. Jutila, J.B. Grace
Changes in density and height of the shrub baccharis halimifolia following burning in coastal tallgrass prairie Changes in density and height of the shrub baccharis halimifolia following burning in coastal tallgrass prairie
No abstract available.
Authors
Larry K. Allain, James B. Grace
The importance of competition in regulating plant species abundance along a salinity gradient The importance of competition in regulating plant species abundance along a salinity gradient
Current theories differ in their predictions concerning the effects of interspecific interactions on species growth and distribution along environmental gradients. In this study, we examined the influence of competition on species composition across a salinity gradient. This work involved three common fresh and brackish marsh species. The three species, Spartina patens, Sagittaria...
Authors
M. K. Greiner La Peyre, James B. Grace, E. Hahn, I.A. Mendelssohn
Interactions between fire and invasive plants in temperate grasslands of North America Interactions between fire and invasive plants in temperate grasslands of North America
A substantial number of invasive grasses, forbs and woody plants have invaded temperate grasslands in North America. Among the invading species are winter annuals, biennials, cool-season perennials, warm-season perennials, vines, shrubs, and trees. Many of these species have been deliberately introduced and widely planted; some are still used for range improvement, pastures, lawns, and...
Authors
James B. Grace, Melinda D. Smith, S.L. Grace, Scott L. Collins, Thomas J. Stohlgren
The roles of community biomass and species pools in the regulation of plant diversity The roles of community biomass and species pools in the regulation of plant diversity
Considerable debate has developed over the importance of community biomass and species pools in the regulation of community diversity. Attempts to explain patterns of plant diversity as a function of community biomass or productivity have been only partially successful and in general, have explained only a fraction of the observed variation in diversity. At the same time studies that...
Authors
J.B. Grace
Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis
Integrated management and policy models suggest that solutions to environmental issues may be linked to the socioeconomic and political Characteristics of a nation. In this study, we empirically explore these suggestions by applying them to the wetland management activities of nations. Structural equation modeling was used to evaluate a model of national wetland management effort and one...
Authors
M.K. La Peyre, I.A. Mendelssohn, M.A. Reams, P.H. Templet, J.B. Grace
Difficulties with estimating and interpreting species pools and the implications for understanding patterns of diversity Difficulties with estimating and interpreting species pools and the implications for understanding patterns of diversity
Evidence has been accumulating that species pools play a major role in regulating variations in small-scale diversity. However, our ability to unambiguously estimate and interpret species pools remains a major impediment to understanding the processes that control patterns of diversity. Two main approaches have been employed to evaluate the relationships between species pools and species...
Authors
J.B. Grace
Fire in eastern ecosystems Fire in eastern ecosystems
Prior to Euro-American settlement, fire was a ubiquitous force across most of the Eastern United States. Fire regimes spanned a time-scale from chronic to centuries. Fire severity varied from benign to extreme (fig. 1-2). Today, fire is still a major force on the landscape. In some ecosystems fire stabilizes succession at a particular sere, while in others, succession is set back to...
Authors
Dale D. Wade, Brent L. Brock, Patrick H. Brose, James B. Grace, G. A. Hoch, William A. Patterson III
The effects of gap size and disturbance type on invasion of wet pine savanna by cogongrass, Imperata cylindrica (Poaceae) The effects of gap size and disturbance type on invasion of wet pine savanna by cogongrass, Imperata cylindrica (Poaceae)
Cogongrass is a nonindigenous species perceived to threaten native communities of the southeastern United States through modification of species composition and alteration of community processes. To examine how gap size and disturbance type influence the invasion of wet pine savannas by cogongrass, we performed three field experiments to evaluate the response of cogongrass seeds and...
Authors
S.E. King, J.B. Grace
Vegetation associations in a rare community type - Coastal tallgrass prairie Vegetation associations in a rare community type - Coastal tallgrass prairie
The coastal prairie ecoregion is located along the northwestern coastal plain of the Gulf of Mexico in North America. Because of agricultural and urban development, less than 1% of the original 3.4 million ha of this ecosystem type remains in native condition, making it one of the most endangered ecosystems in North America. The objective of this study was to characterize the vegetation...
Authors
James B. Grace, Larry K. Allain, Charles Allen
Science and Products
Filter Total Items: 188
Comparing groups using structural equations Comparing groups using structural equations
No abstract available.
Authors
James B. Grace
Examining the relationship between environmental variables and ordination axes using latent variables and structural equation modelling Examining the relationship between environmental variables and ordination axes using latent variables and structural equation modelling
No abstract available
Authors
James B. Grace
Effects of disturbance on germination and seedling establishment in a coastal prairie grassland: A test of the competitive release hypothesis Effects of disturbance on germination and seedling establishment in a coastal prairie grassland: A test of the competitive release hypothesis
1. We evaluated the responses of native grassland sods to a variety of types of disturbance in order to assess hypotheses about the competitive effects of established vegetation on seed germination and seedling establishment. In particular, we consider whether germination is more responsive to the magnitude and duration of vegetation removal (competitive release) or to individual...
Authors
H.M. Jutila, J.B. Grace
Changes in density and height of the shrub baccharis halimifolia following burning in coastal tallgrass prairie Changes in density and height of the shrub baccharis halimifolia following burning in coastal tallgrass prairie
No abstract available.
Authors
Larry K. Allain, James B. Grace
The importance of competition in regulating plant species abundance along a salinity gradient The importance of competition in regulating plant species abundance along a salinity gradient
Current theories differ in their predictions concerning the effects of interspecific interactions on species growth and distribution along environmental gradients. In this study, we examined the influence of competition on species composition across a salinity gradient. This work involved three common fresh and brackish marsh species. The three species, Spartina patens, Sagittaria...
Authors
M. K. Greiner La Peyre, James B. Grace, E. Hahn, I.A. Mendelssohn
Interactions between fire and invasive plants in temperate grasslands of North America Interactions between fire and invasive plants in temperate grasslands of North America
A substantial number of invasive grasses, forbs and woody plants have invaded temperate grasslands in North America. Among the invading species are winter annuals, biennials, cool-season perennials, warm-season perennials, vines, shrubs, and trees. Many of these species have been deliberately introduced and widely planted; some are still used for range improvement, pastures, lawns, and...
Authors
James B. Grace, Melinda D. Smith, S.L. Grace, Scott L. Collins, Thomas J. Stohlgren
The roles of community biomass and species pools in the regulation of plant diversity The roles of community biomass and species pools in the regulation of plant diversity
Considerable debate has developed over the importance of community biomass and species pools in the regulation of community diversity. Attempts to explain patterns of plant diversity as a function of community biomass or productivity have been only partially successful and in general, have explained only a fraction of the observed variation in diversity. At the same time studies that...
Authors
J.B. Grace
Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis Identifying determinants of nations' wetland management programs using structural equation modeling: An exploratory analysis
Integrated management and policy models suggest that solutions to environmental issues may be linked to the socioeconomic and political Characteristics of a nation. In this study, we empirically explore these suggestions by applying them to the wetland management activities of nations. Structural equation modeling was used to evaluate a model of national wetland management effort and one...
Authors
M.K. La Peyre, I.A. Mendelssohn, M.A. Reams, P.H. Templet, J.B. Grace
Difficulties with estimating and interpreting species pools and the implications for understanding patterns of diversity Difficulties with estimating and interpreting species pools and the implications for understanding patterns of diversity
Evidence has been accumulating that species pools play a major role in regulating variations in small-scale diversity. However, our ability to unambiguously estimate and interpret species pools remains a major impediment to understanding the processes that control patterns of diversity. Two main approaches have been employed to evaluate the relationships between species pools and species...
Authors
J.B. Grace
Fire in eastern ecosystems Fire in eastern ecosystems
Prior to Euro-American settlement, fire was a ubiquitous force across most of the Eastern United States. Fire regimes spanned a time-scale from chronic to centuries. Fire severity varied from benign to extreme (fig. 1-2). Today, fire is still a major force on the landscape. In some ecosystems fire stabilizes succession at a particular sere, while in others, succession is set back to...
Authors
Dale D. Wade, Brent L. Brock, Patrick H. Brose, James B. Grace, G. A. Hoch, William A. Patterson III
The effects of gap size and disturbance type on invasion of wet pine savanna by cogongrass, Imperata cylindrica (Poaceae) The effects of gap size and disturbance type on invasion of wet pine savanna by cogongrass, Imperata cylindrica (Poaceae)
Cogongrass is a nonindigenous species perceived to threaten native communities of the southeastern United States through modification of species composition and alteration of community processes. To examine how gap size and disturbance type influence the invasion of wet pine savannas by cogongrass, we performed three field experiments to evaluate the response of cogongrass seeds and...
Authors
S.E. King, J.B. Grace
Vegetation associations in a rare community type - Coastal tallgrass prairie Vegetation associations in a rare community type - Coastal tallgrass prairie
The coastal prairie ecoregion is located along the northwestern coastal plain of the Gulf of Mexico in North America. Because of agricultural and urban development, less than 1% of the original 3.4 million ha of this ecosystem type remains in native condition, making it one of the most endangered ecosystems in North America. The objective of this study was to characterize the vegetation...
Authors
James B. Grace, Larry K. Allain, Charles Allen