Evan Grant, Ph.D.
Evan Grant the principle investigator of the US Geological Survey’s Amphibian Research and Monitoring Initiative (ARMI), northeast region.
Evan's research focuses on questions relating to amphibian populations, specifically with respect to their landscape-scale ecology. Evan also uses decision science to aid resource managers.
Education:
- PhD, 2009, University of Maryland College Park, Program of Marine, Estuarine and Environmental Sciences and Department of Entomology
- BS, 2001, Cornell University, Natural Resources, with Distinction in Research
Science and Products
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Use of multiple dispersal pathways facilitates amphibian persistence in stream networks Use of multiple dispersal pathways facilitates amphibian persistence in stream networks
Although populations of amphibians are declining worldwide, there is no evidence that salamanders occupying small streams are experiencing enigmatic declines, and populations of these species seem stable. Theory predicts that dispersal through multiple pathways can stabilize populations, preventing extinction in habitat networks. However, empirical data to support this prediction are...
Authors
Grant E.H. Campbell, J.D. Nichols, W.H. Lowe, W.F. Fagan
Low prevalence of chytrid fungus (Batrachochytrium dendrobatidis) in amphibians of U.S. headwater streams Low prevalence of chytrid fungus (Batrachochytrium dendrobatidis) in amphibians of U.S. headwater streams
Many declines of amphibian populations have been associated with chytridiomycosis, a disease caused by the aquatic fungus Batrachochytrium dendrobatidis (Bd). Despite the relatively high prevalence of chytridiomycosis in stream amphibians globally, most surveys in North America have focused primarily on wetland-associated species, which are frequently infected. To better understand the
Authors
Blake R. Hossack, M. J. Adams, Evan H. Campbell Grant, Chistopher A. Pearl, James B. Bettaso, William J. Barichivich, Winsor H. Lowe, Kimberly TRUE, Joy L. Ware, Paul Stephen Corn
Monitoring multiple species: Estimating state variables and exploring the efficacy of a monitoring program Monitoring multiple species: Estimating state variables and exploring the efficacy of a monitoring program
Monitoring programs have the potential to identify population declines and differentiate among the possible cause(s) of these declines. Recent criticisms regarding the design of monitoring programs have highlighted a failure to clearly state objectives and to address detectability and spatial sampling issues. Here, we incorporate these criticisms to design an efficient monitoring program...
Authors
S.D. Mattfeldt, L.L. Bailey, E.H.C. Grant
Salamander occupancy in headwater stream networks Salamander occupancy in headwater stream networks
1. Stream ecosystems exhibit a highly consistent dendritic geometry in which linear habitat units intersect to create a hierarchical network of connected branches. 2. Ecological and life history traits of species living in streams, such as the potential for overland movement, may interact with this architecture to shape patterns of occupancy and response to disturbance. Specifically...
Authors
E.H.C. Grant, L.E. Green, W.H. Lowe
Prevalence of the amphibian pathogen Batrachochytrium dendrobatidis in stream and wetland amphibians in Maryland, USA Prevalence of the amphibian pathogen Batrachochytrium dendrobatidis in stream and wetland amphibians in Maryland, USA
The amphibian chytrid fungus Batrachochytrium dendrobatidis, responsible for the potentially fatal amphibian disease chytridiomycosis, is known to occur in a large and ever increasing number of amphibian populations around the world. However, sampling has been biased towards stream- and wetland-breeding anurans, with little attention paid to stream-associated salamanders. We sampled...
Authors
Evan H. Campbell Grant, Larissa L. Bailey, Joy L. Ware, Karen L. Duncan
Multi-scale occupancy estimation and modelling using multiple detection methods Multi-scale occupancy estimation and modelling using multiple detection methods
Occupancy estimation and modelling based on detection–nondetection data provide an effective way of exploring change in a species’ distribution across time and space in cases where the species is not always detected with certainty. Today, many monitoring programmes target multiple species, or life stages within a species, requiring the use of multiple detection methods. When multiple...
Authors
James D. Nichols, Larissa L. Bailey, Allan F. O’Connell, Neil W. Talancy, Evan H. Campbell Grant, Andrew T. Gilbert, Elizabeth M. Annand, Thomas P. Husband, James E. Hines
Methods for estimating the amount of vernal pool habitat in the northeastern United States Methods for estimating the amount of vernal pool habitat in the northeastern United States
The loss of small, seasonal wetlands is a major concern for a variety of state, local, and federal organizations in the northeastern U.S. Identifying and estimating the number of vernal pools within a given region is critical to developing long-term conservation and management strategies for these unique habitats and their faunal communities. We use three probabilistic sampling methods...
Authors
R. Van Meter, L.L. Bailey, E.H.C. Grant
Visual implant elastomer mark retention through metamorphosis in amphibian larvae Visual implant elastomer mark retention through metamorphosis in amphibian larvae
Questions in population ecology require the study of marked animals, and marks are assumed to be permanent and not overlooked by observers. I evaluated retention through metamorphosis of visual implant elastomer marks in larval salamanders and frogs and assessed error in observer identification of these marks. I found 1) individual marks were not retained in larval wood frogs (Rana...
Authors
Evan H. Campbell Grant
Living in the branches: Population dynamics and ecological processes in dendritic networks Living in the branches: Population dynamics and ecological processes in dendritic networks
Spatial structure regulates and modifies processes at several levels of ecological organization (e.g. individual/genetic, population and community) and is thus a key component of complex systems, where knowledge at a small scale can be insufficient for understanding system behaviour at a larger scale. Recent syntheses outline potential applications of network theory to ecological systems...
Authors
E.H.C. Grant, W.H. Lowe, W.F. Fagan
Are two methods better than one? Area constrained transects and leaf litterbags for sampling stream salamanders Are two methods better than one? Area constrained transects and leaf litterbags for sampling stream salamanders
No abstract available.
Authors
S.D. Mattfeldt, E.H.C. Grant
The Amphibian Research and Monitoring Initiative (ARMI): 5-year report The Amphibian Research and Monitoring Initiative (ARMI): 5-year report
The Amphibian Research and Monitoring Initiative (ARMI) is an innovative, multidisciplinary program that began in 2000 in response to a congressional directive for the Department of the Interior to address the issue of amphibian declines in the United States. ARMI’s formulation was cross-disciplinary, integrating U.S. Geological Survey scientists from Biology, Water, and Geography to...
Authors
Erin Muths, Alisa L. Gallant, Evan H. Campbell Grant, William A. Battaglin, David E. Green, Jennifer S. Staiger, Susan C. Walls, Margaret S. Gunzburger, Rick F. Kearney
Addressing error in identification of Ambystoma maculatum (spotted salamanders) using spot patterns Addressing error in identification of Ambystoma maculatum (spotted salamanders) using spot patterns
No abstract available.
Authors
E.H.C. Grant, P. Nanjappa
Filter Total Items: 15
Science and Products
Filter Total Items: 21
Filter Total Items: 28
No Result Found
Filter Total Items: 148
Use of multiple dispersal pathways facilitates amphibian persistence in stream networks Use of multiple dispersal pathways facilitates amphibian persistence in stream networks
Although populations of amphibians are declining worldwide, there is no evidence that salamanders occupying small streams are experiencing enigmatic declines, and populations of these species seem stable. Theory predicts that dispersal through multiple pathways can stabilize populations, preventing extinction in habitat networks. However, empirical data to support this prediction are...
Authors
Grant E.H. Campbell, J.D. Nichols, W.H. Lowe, W.F. Fagan
Low prevalence of chytrid fungus (Batrachochytrium dendrobatidis) in amphibians of U.S. headwater streams Low prevalence of chytrid fungus (Batrachochytrium dendrobatidis) in amphibians of U.S. headwater streams
Many declines of amphibian populations have been associated with chytridiomycosis, a disease caused by the aquatic fungus Batrachochytrium dendrobatidis (Bd). Despite the relatively high prevalence of chytridiomycosis in stream amphibians globally, most surveys in North America have focused primarily on wetland-associated species, which are frequently infected. To better understand the
Authors
Blake R. Hossack, M. J. Adams, Evan H. Campbell Grant, Chistopher A. Pearl, James B. Bettaso, William J. Barichivich, Winsor H. Lowe, Kimberly TRUE, Joy L. Ware, Paul Stephen Corn
Monitoring multiple species: Estimating state variables and exploring the efficacy of a monitoring program Monitoring multiple species: Estimating state variables and exploring the efficacy of a monitoring program
Monitoring programs have the potential to identify population declines and differentiate among the possible cause(s) of these declines. Recent criticisms regarding the design of monitoring programs have highlighted a failure to clearly state objectives and to address detectability and spatial sampling issues. Here, we incorporate these criticisms to design an efficient monitoring program...
Authors
S.D. Mattfeldt, L.L. Bailey, E.H.C. Grant
Salamander occupancy in headwater stream networks Salamander occupancy in headwater stream networks
1. Stream ecosystems exhibit a highly consistent dendritic geometry in which linear habitat units intersect to create a hierarchical network of connected branches. 2. Ecological and life history traits of species living in streams, such as the potential for overland movement, may interact with this architecture to shape patterns of occupancy and response to disturbance. Specifically...
Authors
E.H.C. Grant, L.E. Green, W.H. Lowe
Prevalence of the amphibian pathogen Batrachochytrium dendrobatidis in stream and wetland amphibians in Maryland, USA Prevalence of the amphibian pathogen Batrachochytrium dendrobatidis in stream and wetland amphibians in Maryland, USA
The amphibian chytrid fungus Batrachochytrium dendrobatidis, responsible for the potentially fatal amphibian disease chytridiomycosis, is known to occur in a large and ever increasing number of amphibian populations around the world. However, sampling has been biased towards stream- and wetland-breeding anurans, with little attention paid to stream-associated salamanders. We sampled...
Authors
Evan H. Campbell Grant, Larissa L. Bailey, Joy L. Ware, Karen L. Duncan
Multi-scale occupancy estimation and modelling using multiple detection methods Multi-scale occupancy estimation and modelling using multiple detection methods
Occupancy estimation and modelling based on detection–nondetection data provide an effective way of exploring change in a species’ distribution across time and space in cases where the species is not always detected with certainty. Today, many monitoring programmes target multiple species, or life stages within a species, requiring the use of multiple detection methods. When multiple...
Authors
James D. Nichols, Larissa L. Bailey, Allan F. O’Connell, Neil W. Talancy, Evan H. Campbell Grant, Andrew T. Gilbert, Elizabeth M. Annand, Thomas P. Husband, James E. Hines
Methods for estimating the amount of vernal pool habitat in the northeastern United States Methods for estimating the amount of vernal pool habitat in the northeastern United States
The loss of small, seasonal wetlands is a major concern for a variety of state, local, and federal organizations in the northeastern U.S. Identifying and estimating the number of vernal pools within a given region is critical to developing long-term conservation and management strategies for these unique habitats and their faunal communities. We use three probabilistic sampling methods...
Authors
R. Van Meter, L.L. Bailey, E.H.C. Grant
Visual implant elastomer mark retention through metamorphosis in amphibian larvae Visual implant elastomer mark retention through metamorphosis in amphibian larvae
Questions in population ecology require the study of marked animals, and marks are assumed to be permanent and not overlooked by observers. I evaluated retention through metamorphosis of visual implant elastomer marks in larval salamanders and frogs and assessed error in observer identification of these marks. I found 1) individual marks were not retained in larval wood frogs (Rana...
Authors
Evan H. Campbell Grant
Living in the branches: Population dynamics and ecological processes in dendritic networks Living in the branches: Population dynamics and ecological processes in dendritic networks
Spatial structure regulates and modifies processes at several levels of ecological organization (e.g. individual/genetic, population and community) and is thus a key component of complex systems, where knowledge at a small scale can be insufficient for understanding system behaviour at a larger scale. Recent syntheses outline potential applications of network theory to ecological systems...
Authors
E.H.C. Grant, W.H. Lowe, W.F. Fagan
Are two methods better than one? Area constrained transects and leaf litterbags for sampling stream salamanders Are two methods better than one? Area constrained transects and leaf litterbags for sampling stream salamanders
No abstract available.
Authors
S.D. Mattfeldt, E.H.C. Grant
The Amphibian Research and Monitoring Initiative (ARMI): 5-year report The Amphibian Research and Monitoring Initiative (ARMI): 5-year report
The Amphibian Research and Monitoring Initiative (ARMI) is an innovative, multidisciplinary program that began in 2000 in response to a congressional directive for the Department of the Interior to address the issue of amphibian declines in the United States. ARMI’s formulation was cross-disciplinary, integrating U.S. Geological Survey scientists from Biology, Water, and Geography to...
Authors
Erin Muths, Alisa L. Gallant, Evan H. Campbell Grant, William A. Battaglin, David E. Green, Jennifer S. Staiger, Susan C. Walls, Margaret S. Gunzburger, Rick F. Kearney
Addressing error in identification of Ambystoma maculatum (spotted salamanders) using spot patterns Addressing error in identification of Ambystoma maculatum (spotted salamanders) using spot patterns
No abstract available.
Authors
E.H.C. Grant, P. Nanjappa
Filter Total Items: 15