Helen Sofaer, PhD
Helen Sofaer is a Research Ecologist at the Pacific Island Ecosystems Research Center in Hawai‘i.
Science and Products
Filter Total Items: 25
Data used to estimate and project the effects of climate and land use change on wetland densities in the Prairie Pothole Region Data used to estimate and project the effects of climate and land use change on wetland densities in the Prairie Pothole Region
These data were used to estimate models relating climate and land cover to wetland densities and develop projections under climate and land use change. Data for model estimation were derived from historical climate data, estimates of hydrological processes based on the Variable Infiltration Capacity model, National Wetlands Inventory, and the National Land Cover Database. Wetland...
Filter Total Items: 43
A science agenda to inform natural resource management decisions in an era of ecological transformation A science agenda to inform natural resource management decisions in an era of ecological transformation
Earth is experiencing widespread ecological transformation in terrestrial, freshwater, and marine ecosystems that is attributable to directional environmental changes, especially intensifying climate change. To better steward ecosystems facing unprecedented and lasting change, a new management paradigm is forming, supported by a decision-oriented framework that presents three distinct...
Authors
Shelley Crausbay, Helen Sofaer, Amanda Cravens, Brian Chaffin, Katherine Clifford, John Gross, Corrine Knapp, David Lawrence, Dawn Magness, Abraham Miller-Rushing, Gregor Schuurman, Camille Stevens-Rumann
Modelling presence versus abundance for invasive species risk assessment Modelling presence versus abundance for invasive species risk assessment
Aim Invasive species prevention and management can be guided by comparisons of invasion risk across space and among species. Species distribution models are widely used to assess invasion risk and typically estimate suitability for species presence. However, suitability for presence may not capture patterns of abundance and impact. We asked how models estimating suitability for presence...
Authors
Catherine Jarnevich, Helen Sofaer, Peder Engelstad
Negative effects of an allelopathic invader on AM fungal plant species drive community‐level responses Negative effects of an allelopathic invader on AM fungal plant species drive community‐level responses
The mechanisms causing invasive species impact are rarely empirically tested, limiting our ability to understand and predict subsequent changes in invaded plant communities. Invader disruption of native mutualistic interactions is a mechanism expected to have negative effects on native plant species. Specifically, disruption of native plant‐fungal mutualisms may provide non‐mycorrhizal...
Authors
Morgan Roche, Ian Pearse, Lalasia Bialic-Murphy, Stephanie Kivlin, Helen Sofaer, Susan Kalisz
Ecological forecasting—21st century science for 21st century management Ecological forecasting—21st century science for 21st century management
Natural resource managers are coping with rapid changes in both environmental conditions and ecosystems. Enabled by recent advances in data collection and assimilation, short-term ecological forecasting may be a powerful tool to help resource managers anticipate impending near-term changes in ecosystem conditions or dynamics. Managers may use the information in forecasts to minimize the...
Authors
John Bradford, Jake Weltzin, Molly McCormick, Jill Baron, Zack Bowen, Sky Bristol, Daren Carlisle, Theresa Crimmins, Paul C. Cross, Joe DeVivo, Mike Dietze, Mary Freeman, Jason Goldberg, Mevin Hooten, Leslie Hsu, Karen Jenni, Jennifer Keisman, Jonathan G. Kennen, Kathy Lee, David Lesmes, Keith Loftin, Brian Miller, Peter Murdoch, Jana Newman, Karen Prentice, Imtiaz Rangwala, Jordan Read, Jennifer Sieracki, Helen Sofaer, Steve Thur, Gordon Toevs, Francisco Werner, C. White, Timothy White, Mark Wiltermuth
By
Ecosystems Mission Area, Water Resources Mission Area, Science Synthesis, Analysis, and Research Program, Contaminant Biology, Environmental Health Program, Science Analytics and Synthesis (SAS) Program, Central Plains Water Science Center, Eastern Ecological Science Center, Fort Collins Science Center, Kansas Water Science Center, Maryland-Delaware-D.C. Water Science Center, National Wildlife Health Center, New Jersey Water Science Center, Pacific Island Ecosystems Research Center, Southwest Biological Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center
A modeling workflow that balances automation and human intervention to inform invasive plant management decisions at multiple spatial scales A modeling workflow that balances automation and human intervention to inform invasive plant management decisions at multiple spatial scales
Predictions of habitat suitability for invasive plant species can guide risk assessments at regional and national scales and inform early detection and rapid-response strategies at local scales. We present a general approach to invasive species modeling and mapping that meets objectives at multiple scales. Our methodology is designed to balance trade-offs between developing highly...
Authors
Nicholas Young, Catherine Jarnevich, Helen Sofaer, Ian Pearse, Julia Sullivan, Peder Engelstad, Thomas Stohlgren
Human-associated species dominate passerine communities across the United States Human-associated species dominate passerine communities across the United States
Aim Human development and agriculture can have transformative and homogenizing effects on natural systems, shifting the composition of ecological communities towards non-native and native species that tolerate or thrive under human-dominated conditions. These impacts cannot be fully captured by summarizing species presence, as they include dramatic changes to patterns of species...
Authors
Helen Sofaer, Curtis Flather, Catherine Jarnevich, Kristin Davis, Liba Pejchar
Co-occurrence and occupancy dynamics of mourning doves and Eurasian collared-doves Co-occurrence and occupancy dynamics of mourning doves and Eurasian collared-doves
Understanding how land cover and potential competition with invasive species shape patterns of occupancy, extirpation, and colonization of native species across a landscape can help target management for declining native populations. Mourning dove (Zenaida macroura) populations have declined throughout the United States from 1965–2015. The expansion of the Eurasian collared‐dove...
Authors
Adam W. Green, Helen Sofaer, David Otis, Nicholas Van Lanen
The development and delivery of species distribution models to inform decision-making The development and delivery of species distribution models to inform decision-making
Information on where species occur is central to conservation and management decisions, but knowledge of distributions can be coarse or incomplete. Species distribution models provide a tool for mapping suitable habitat, and can produce credible, defensible, and repeatable predictive information with which to inform decisions. However, these models are sensitive to data inputs and...
Authors
Helen Sofaer, Catherine Jarnevich, Ian Pearse, Regan Smyth, Stephanie Auer, Cook L, Thomas C. Edwards, Gerald Guala, Timothy Howard, Jeffrey T. Morisette, Healy Hamilton
Non-native plants have greater impacts because of differing per-capita effects and non-linear abundance-impact curves Non-native plants have greater impacts because of differing per-capita effects and non-linear abundance-impact curves
Invasive, non-native species can have tremendous impacts on biotic communities, where they reduce the abundance and diversity of local species. However, it remains unclear whether impacts of non-native species arise from their high abundance or whether each non-native individual has a disproportionate impact – i.e., a higher per-capita effect – on co-occurring species compared to impacts...
Authors
Ian Pearse, Helen Sofaer, David Zaya, Greg Spyreas
Clustering and ensembling approaches to support surrogate-based species management Clustering and ensembling approaches to support surrogate-based species management
Aim Surrogate species can provide an efficient mechanism for biodiversity conservation if they encompass the needs or indicate the status of a broader set of species. When species that are the focus of ongoing management efforts act as effective surrogates for other species, these incidental surrogacy benefits lead to additional efficiency. Assessing surrogate relationships often relies...
Authors
Helen Sofaer, Curtis Flather, Susan K. Skagen, Valerie Steen, Barry Noon
The area under the precision‐recall curve as a performance metric for rare binary events The area under the precision‐recall curve as a performance metric for rare binary events
Species distribution models are used to study biogeographic patterns and guide decision‐making. The variable quality of these models makes it critical to assess whether a model's outputs are suitable for the intended use, but commonly used evaluation approaches are inappropriate for many ecological contexts. In particular, unrealistically high performance assessments have been associated...
Authors
Helen Sofaer, Jennifer Hoeting, Catherine Jarnevich
Integrating landscape simulation models with economic and decision tools for invasive species control Integrating landscape simulation models with economic and decision tools for invasive species control
In managing invasive species, land managers and policy makers need information to help allocate scarce resources as efficiently and effectively as possible. Decisions regarding treatment methods, locations, effort, and timing can be informed by the integration of landscape simulation models with economic tools. State and transition simulation models align with conceptual models of...
Authors
Catherine Cullinane Thomas, Helen Sofaer, Sarah Cline, Catherine Jarnevich
Science and Products
Filter Total Items: 25
Data used to estimate and project the effects of climate and land use change on wetland densities in the Prairie Pothole Region Data used to estimate and project the effects of climate and land use change on wetland densities in the Prairie Pothole Region
These data were used to estimate models relating climate and land cover to wetland densities and develop projections under climate and land use change. Data for model estimation were derived from historical climate data, estimates of hydrological processes based on the Variable Infiltration Capacity model, National Wetlands Inventory, and the National Land Cover Database. Wetland...
Filter Total Items: 43
A science agenda to inform natural resource management decisions in an era of ecological transformation A science agenda to inform natural resource management decisions in an era of ecological transformation
Earth is experiencing widespread ecological transformation in terrestrial, freshwater, and marine ecosystems that is attributable to directional environmental changes, especially intensifying climate change. To better steward ecosystems facing unprecedented and lasting change, a new management paradigm is forming, supported by a decision-oriented framework that presents three distinct...
Authors
Shelley Crausbay, Helen Sofaer, Amanda Cravens, Brian Chaffin, Katherine Clifford, John Gross, Corrine Knapp, David Lawrence, Dawn Magness, Abraham Miller-Rushing, Gregor Schuurman, Camille Stevens-Rumann
Modelling presence versus abundance for invasive species risk assessment Modelling presence versus abundance for invasive species risk assessment
Aim Invasive species prevention and management can be guided by comparisons of invasion risk across space and among species. Species distribution models are widely used to assess invasion risk and typically estimate suitability for species presence. However, suitability for presence may not capture patterns of abundance and impact. We asked how models estimating suitability for presence...
Authors
Catherine Jarnevich, Helen Sofaer, Peder Engelstad
Negative effects of an allelopathic invader on AM fungal plant species drive community‐level responses Negative effects of an allelopathic invader on AM fungal plant species drive community‐level responses
The mechanisms causing invasive species impact are rarely empirically tested, limiting our ability to understand and predict subsequent changes in invaded plant communities. Invader disruption of native mutualistic interactions is a mechanism expected to have negative effects on native plant species. Specifically, disruption of native plant‐fungal mutualisms may provide non‐mycorrhizal...
Authors
Morgan Roche, Ian Pearse, Lalasia Bialic-Murphy, Stephanie Kivlin, Helen Sofaer, Susan Kalisz
Ecological forecasting—21st century science for 21st century management Ecological forecasting—21st century science for 21st century management
Natural resource managers are coping with rapid changes in both environmental conditions and ecosystems. Enabled by recent advances in data collection and assimilation, short-term ecological forecasting may be a powerful tool to help resource managers anticipate impending near-term changes in ecosystem conditions or dynamics. Managers may use the information in forecasts to minimize the...
Authors
John Bradford, Jake Weltzin, Molly McCormick, Jill Baron, Zack Bowen, Sky Bristol, Daren Carlisle, Theresa Crimmins, Paul C. Cross, Joe DeVivo, Mike Dietze, Mary Freeman, Jason Goldberg, Mevin Hooten, Leslie Hsu, Karen Jenni, Jennifer Keisman, Jonathan G. Kennen, Kathy Lee, David Lesmes, Keith Loftin, Brian Miller, Peter Murdoch, Jana Newman, Karen Prentice, Imtiaz Rangwala, Jordan Read, Jennifer Sieracki, Helen Sofaer, Steve Thur, Gordon Toevs, Francisco Werner, C. White, Timothy White, Mark Wiltermuth
By
Ecosystems Mission Area, Water Resources Mission Area, Science Synthesis, Analysis, and Research Program, Contaminant Biology, Environmental Health Program, Science Analytics and Synthesis (SAS) Program, Central Plains Water Science Center, Eastern Ecological Science Center, Fort Collins Science Center, Kansas Water Science Center, Maryland-Delaware-D.C. Water Science Center, National Wildlife Health Center, New Jersey Water Science Center, Pacific Island Ecosystems Research Center, Southwest Biological Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center
A modeling workflow that balances automation and human intervention to inform invasive plant management decisions at multiple spatial scales A modeling workflow that balances automation and human intervention to inform invasive plant management decisions at multiple spatial scales
Predictions of habitat suitability for invasive plant species can guide risk assessments at regional and national scales and inform early detection and rapid-response strategies at local scales. We present a general approach to invasive species modeling and mapping that meets objectives at multiple scales. Our methodology is designed to balance trade-offs between developing highly...
Authors
Nicholas Young, Catherine Jarnevich, Helen Sofaer, Ian Pearse, Julia Sullivan, Peder Engelstad, Thomas Stohlgren
Human-associated species dominate passerine communities across the United States Human-associated species dominate passerine communities across the United States
Aim Human development and agriculture can have transformative and homogenizing effects on natural systems, shifting the composition of ecological communities towards non-native and native species that tolerate or thrive under human-dominated conditions. These impacts cannot be fully captured by summarizing species presence, as they include dramatic changes to patterns of species...
Authors
Helen Sofaer, Curtis Flather, Catherine Jarnevich, Kristin Davis, Liba Pejchar
Co-occurrence and occupancy dynamics of mourning doves and Eurasian collared-doves Co-occurrence and occupancy dynamics of mourning doves and Eurasian collared-doves
Understanding how land cover and potential competition with invasive species shape patterns of occupancy, extirpation, and colonization of native species across a landscape can help target management for declining native populations. Mourning dove (Zenaida macroura) populations have declined throughout the United States from 1965–2015. The expansion of the Eurasian collared‐dove...
Authors
Adam W. Green, Helen Sofaer, David Otis, Nicholas Van Lanen
The development and delivery of species distribution models to inform decision-making The development and delivery of species distribution models to inform decision-making
Information on where species occur is central to conservation and management decisions, but knowledge of distributions can be coarse or incomplete. Species distribution models provide a tool for mapping suitable habitat, and can produce credible, defensible, and repeatable predictive information with which to inform decisions. However, these models are sensitive to data inputs and...
Authors
Helen Sofaer, Catherine Jarnevich, Ian Pearse, Regan Smyth, Stephanie Auer, Cook L, Thomas C. Edwards, Gerald Guala, Timothy Howard, Jeffrey T. Morisette, Healy Hamilton
Non-native plants have greater impacts because of differing per-capita effects and non-linear abundance-impact curves Non-native plants have greater impacts because of differing per-capita effects and non-linear abundance-impact curves
Invasive, non-native species can have tremendous impacts on biotic communities, where they reduce the abundance and diversity of local species. However, it remains unclear whether impacts of non-native species arise from their high abundance or whether each non-native individual has a disproportionate impact – i.e., a higher per-capita effect – on co-occurring species compared to impacts...
Authors
Ian Pearse, Helen Sofaer, David Zaya, Greg Spyreas
Clustering and ensembling approaches to support surrogate-based species management Clustering and ensembling approaches to support surrogate-based species management
Aim Surrogate species can provide an efficient mechanism for biodiversity conservation if they encompass the needs or indicate the status of a broader set of species. When species that are the focus of ongoing management efforts act as effective surrogates for other species, these incidental surrogacy benefits lead to additional efficiency. Assessing surrogate relationships often relies...
Authors
Helen Sofaer, Curtis Flather, Susan K. Skagen, Valerie Steen, Barry Noon
The area under the precision‐recall curve as a performance metric for rare binary events The area under the precision‐recall curve as a performance metric for rare binary events
Species distribution models are used to study biogeographic patterns and guide decision‐making. The variable quality of these models makes it critical to assess whether a model's outputs are suitable for the intended use, but commonly used evaluation approaches are inappropriate for many ecological contexts. In particular, unrealistically high performance assessments have been associated...
Authors
Helen Sofaer, Jennifer Hoeting, Catherine Jarnevich
Integrating landscape simulation models with economic and decision tools for invasive species control Integrating landscape simulation models with economic and decision tools for invasive species control
In managing invasive species, land managers and policy makers need information to help allocate scarce resources as efficiently and effectively as possible. Decisions regarding treatment methods, locations, effort, and timing can be informed by the integration of landscape simulation models with economic tools. State and transition simulation models align with conceptual models of...
Authors
Catherine Cullinane Thomas, Helen Sofaer, Sarah Cline, Catherine Jarnevich