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
ResearcherID: N-5160-2014
Research Gate profile: http://www.researchgate.net/profile/Evan_Grant2
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The U.S. Geological Survey Amphibian Research and Monitoring Initiative-2011 Annual Update
Welcome to the inaugural issue of ARMI's Annual Update. This update provides highlights and significant milestones of this innovative program. ARMI is uniquely qualified to provide research and monitoring results that are scalable from local to national levels, and are useful to resource managers. ARMI has produced nearly 400 peer-reviewed publications, including 18 in 2011. Some of those publicat
Authors
M.J. Adams, E. Muths, E.H.C. Grant, David A. Miller, J.H. Waddle, L.C. Ball
Interbasin water transfer, riverine connectivity, and spatial controls on fish biodiversity
Background Large-scale inter-basin water transfer (IBWT) projects are commonly proposed as solutions to water distribution and supply problems. These problems are likely to intensify under future population growth and climate change scenarios. Scarce data on the distribution of freshwater fishes frequently limits the ability to assess the potential implications of an IBWT project on freshwater fis
Authors
Evan H. Campbell Grant, Heather J. Lynch, Rachata Muneepeerakul, Arunachalam Muthukumarasamy, Ignacio Rodríguez-Iturbe, William F. Fagan
Structural complexity, movement bias, and metapopulation extinction risk in dendritic ecological networks
Spatial complexity in metacommunities can be separated into 3 main components: size (i.e., number of habitat patches), spatial arrangement of habitat patches (network topology), and diversity of habitat patch types. Much attention has been paid to lattice-type networks, such as patch-based metapopulations, but interest in understanding ecological networks of alternative geometries is building. Den
Authors
Evan H. Campbell Grant
Landscape matrix mediates occupancy dynamics of Neotropical avian insectivores
In addition to patch‐level attributes (i.e., area and isolation), the nature of land cover between habitat patches (the matrix) may drive colonization and extinction dynamics in fragmented landscapes. Despite a long‐standing recognition of matrix effects in fragmented systems, an understanding of the relative impacts of different types of land cover on patterns and dynamics of species occurrence r
Authors
Christina M. Kennedy, Evan H. Campbell Grant, Maile C. Neel, William F. Fagan, Peter P. Marra
How restructuring river connectivity changes freshwater fish biodiversity and biogeography
Interbasin water transfer projects, in which river connectivity is restructured via man-made canals, are an increasingly popular solution to address the spatial mismatch between supply and demand of fresh water. However, the ecological consequences of such restructuring remain largely unexplored, and there are no general theoretical guidelines from which to derive these expectations. River systems
Authors
Heather L. Lynch, Evan H. Campbell Grant, Rachata Muneepeerakul, Muthukumarasamy Arunachalam, Ignacio Rodriguez-Iturbe, William F. Fagan
Improving occupancy estimation when two types of observational error occur: Non-detection and species misidentification
Efforts to draw inferences about species occurrence frequently account for false negatives, the common situation when individuals of a species are not detected even when a site is occupied. However, recent studies suggest the need to also deal with false positives, which occur when species are misidentified so that a species is recorded as detected when a site is unoccupied. Bias in estimators of
Authors
David Miller, James D. Nichols, B.T. McClintock, Evan H. Campbell Grant, L.L. Bailey, L.A. Weir
Metacommunity theory as a multispecies, multiscale framework for studying the influence of river network structure on riverine communities and ecosystems
Explaining the mechanisms underlying patterns of species diversity and composition in riverine networks is challenging. Historically, community ecologists have conceived of communities as largely isolated entities and have focused on local environmental factors and interspecific interactions as the major forces determining species composition. However, stream ecologists have long embraced a multis
Authors
B.L. Brown, C.M. Swan, D.A. Auerbach, Grant E.H. Campbell, N.P. Hitt, K.O. Maloney, C. Patrick
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 absent for mo
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
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 distributio
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
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, large-scal
Authors
E.H.C. Grant, L.E. Green, W.H. Lowe
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 whose g
Authors
S.D. Mattfeldt, L.L. Bailey, E.H.C. Grant
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 (simple ra
Authors
R. Van Meter, L.L. Bailey, E.H.C. Grant
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The U.S. Geological Survey Amphibian Research and Monitoring Initiative-2011 Annual Update
Welcome to the inaugural issue of ARMI's Annual Update. This update provides highlights and significant milestones of this innovative program. ARMI is uniquely qualified to provide research and monitoring results that are scalable from local to national levels, and are useful to resource managers. ARMI has produced nearly 400 peer-reviewed publications, including 18 in 2011. Some of those publicatAuthorsM.J. Adams, E. Muths, E.H.C. Grant, David A. Miller, J.H. Waddle, L.C. BallInterbasin water transfer, riverine connectivity, and spatial controls on fish biodiversity
Background Large-scale inter-basin water transfer (IBWT) projects are commonly proposed as solutions to water distribution and supply problems. These problems are likely to intensify under future population growth and climate change scenarios. Scarce data on the distribution of freshwater fishes frequently limits the ability to assess the potential implications of an IBWT project on freshwater fisAuthorsEvan H. Campbell Grant, Heather J. Lynch, Rachata Muneepeerakul, Arunachalam Muthukumarasamy, Ignacio Rodríguez-Iturbe, William F. FaganStructural complexity, movement bias, and metapopulation extinction risk in dendritic ecological networks
Spatial complexity in metacommunities can be separated into 3 main components: size (i.e., number of habitat patches), spatial arrangement of habitat patches (network topology), and diversity of habitat patch types. Much attention has been paid to lattice-type networks, such as patch-based metapopulations, but interest in understanding ecological networks of alternative geometries is building. DenAuthorsEvan H. Campbell GrantLandscape matrix mediates occupancy dynamics of Neotropical avian insectivores
In addition to patch‐level attributes (i.e., area and isolation), the nature of land cover between habitat patches (the matrix) may drive colonization and extinction dynamics in fragmented landscapes. Despite a long‐standing recognition of matrix effects in fragmented systems, an understanding of the relative impacts of different types of land cover on patterns and dynamics of species occurrence rAuthorsChristina M. Kennedy, Evan H. Campbell Grant, Maile C. Neel, William F. Fagan, Peter P. MarraHow restructuring river connectivity changes freshwater fish biodiversity and biogeography
Interbasin water transfer projects, in which river connectivity is restructured via man-made canals, are an increasingly popular solution to address the spatial mismatch between supply and demand of fresh water. However, the ecological consequences of such restructuring remain largely unexplored, and there are no general theoretical guidelines from which to derive these expectations. River systemsAuthorsHeather L. Lynch, Evan H. Campbell Grant, Rachata Muneepeerakul, Muthukumarasamy Arunachalam, Ignacio Rodriguez-Iturbe, William F. FaganImproving occupancy estimation when two types of observational error occur: Non-detection and species misidentification
Efforts to draw inferences about species occurrence frequently account for false negatives, the common situation when individuals of a species are not detected even when a site is occupied. However, recent studies suggest the need to also deal with false positives, which occur when species are misidentified so that a species is recorded as detected when a site is unoccupied. Bias in estimators ofAuthorsDavid Miller, James D. Nichols, B.T. McClintock, Evan H. Campbell Grant, L.L. Bailey, L.A. WeirMetacommunity theory as a multispecies, multiscale framework for studying the influence of river network structure on riverine communities and ecosystems
Explaining the mechanisms underlying patterns of species diversity and composition in riverine networks is challenging. Historically, community ecologists have conceived of communities as largely isolated entities and have focused on local environmental factors and interspecific interactions as the major forces determining species composition. However, stream ecologists have long embraced a multisAuthorsB.L. Brown, C.M. Swan, D.A. Auerbach, Grant E.H. Campbell, N.P. Hitt, K.O. Maloney, C. PatrickUse 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 absent for moAuthorsGrant E.H. Campbell, J. D. Nichols, W.H. Lowe, W.F. FaganLow 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 distributioAuthorsBlake 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 CornSalamander 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, large-scalAuthorsE.H.C. Grant, L.E. Green, W.H. LoweMonitoring 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 whose gAuthorsS.D. Mattfeldt, L.L. Bailey, E.H.C. GrantMethods 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 (simple raAuthorsR. Van Meter, L.L. Bailey, E.H.C. Grant - Web Tools
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