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 to create and evaluate distribution models for invasive species for different geographic extents Data to create and evaluate distribution models for invasive species for different geographic extents
We developed habitat suitability models for invasive plant species selected by Department of Interior land management agencies. We applied the modeling workflow developed in Young et al. 2020 to species not included in the original case studies. Our methodology balanced trade-offs between developing highly customized models for a few species versus fitting non-specific and generic models...
High-throughput calculations of climatch scores High-throughput calculations of climatch scores
Matching climate envelopes allows people to examine how potential invasive species may match habitats. This repository contains code for using the climatchR package for high-throughput calculations of climatch scores for species using GBIF data. Climatch is based upon the climatch algorithm as implemented through the climatchR package.
Great Basin predicted potential cheatgrass abundance, with model estimation and validation data from 2011-2019 Great Basin predicted potential cheatgrass abundance, with model estimation and validation data from 2011-2019
This data release includes data and metadata describing 1) the rule set used to create vegetation type categories for the Great Basin; 2) estimation and validation data used to fit models of cheatgrass (Bromus tectorum) cover; and 3) mapped predictions of potential cheatgrass abundance.
Presence and abundance data and models for four invasive plant species Presence and abundance data and models for four invasive plant species
We developed habitat suitability models for four invasive plant species of concern to Department of Interior land management agencies. We generally followed the modeling workflow developed in Young et al. 2020, but developed models both for two data types, where species were present and where they were abundant. We developed models using five algorithms with VisTrails: Software for...
climatchR: An implementation of Climatch in R climatchR: An implementation of Climatch in R
Matching climate envelopes of allows people to examine how potential invasive species may match habitats. The Australian government created Climatch to do allow for these comparisons. However, this webpage does not allow for readily scripting climate matching. Hence, the authors created climatchR, an R package (R Core Team 2020) implementing the climatch method in R. This was created to...
Co-occurrence and Occupancy Dynamics of Mourning Doves and Eurasian Collared-Doves Co-occurrence and Occupancy Dynamics of Mourning Doves and Eurasian Collared-Doves
Data on mourning dove and Eurasian collared-dove occurrences, and associated covariates.
Filter Total Items: 44
Observed and potential range shifts of native and non-native species with climate change Observed and potential range shifts of native and non-native species with climate change
There is broad concern that the range shifts of global flora and fauna will not keep up with climate change, increasing the likelihood of population declines and extinctions. Many populations of nonnative species already have advantages over native species, including widespread human-aided dispersal and release from natural enemies. But do nonnative species also have an advantage with...
Authors
Bethany A. Bradley, Evelyn M. Beaury, Belinda Gallardo, Inés Ibáñez, Catherine S. Jarnevich, Toni Lyn Morelli, Helen Sofaer, Cascade J.B. Sorte, Montserrat Vilà
Environmental and geographical factors influence the occurrence and abundance of the southern house mosquito, Culex quinquefasciatus, in Hawai‘i Environmental and geographical factors influence the occurrence and abundance of the southern house mosquito, Culex quinquefasciatus, in Hawai‘i
Hawaiian honeycreepers, a group of endemic Hawaiian forest birds, are being threatened by avian malaria, a non-native disease that is driving honeycreepers populations to extinction. Avian malaria is caused by the parasite Plasmodium relictum, which is transmitted by the invasive mosquito Culex quinquefasciatus. Environmental and geographical factors play an important role in shaping...
Authors
Oswaldo Villena, Katherine Maria McClure, Richard J. Camp, Dennis A. LaPointe, Carter T. Atkinson, Helen Sofaer, Lucas Berio Fortini
The use of semiochemicals for attracting and repelling invasive ambrosia beetles (Coleoptera: Curculionidae) in ʻōhiʻa (Metrosideros polymorpha) forests The use of semiochemicals for attracting and repelling invasive ambrosia beetles (Coleoptera: Curculionidae) in ʻōhiʻa (Metrosideros polymorpha) forests
Early detection of invasive species is critical for preventing ecological and economic damage and maintaining ecosystem health. In Hawaiʻi, a complex of generalist ambrosia beetle species in the tribe Xyleborini (Coleoptera: Scolytinae) are threatening the health and productivity of forests and crops due to their association with tree diseases such as rapid ʻōhiʻa death (ROD) and key...
Authors
Kylle Roy, Helen R. Sofaer, Robert W. Peck, Ellen Dunkle, Dan Mikros, Sheri L. Smith, Matthew D. Ginzel
Macroscale analyses suggest invasive plant impacts depend more on the composition of invading plants than on environmental context Macroscale analyses suggest invasive plant impacts depend more on the composition of invading plants than on environmental context
Aim Native biodiversity is threatened by the spread of non-native invasive species. Many studies demonstrate that invasions reduce local biodiversity but we lack an understanding of how impacts vary across environments at the macroscale. Using ~11,500 vegetation surveys from ecosystems across the United States, we quantified how the relationship between non-native plant cover and native...
Authors
Evelyn M. Beaury, Helen Sofaer, Regan Early, Ian S. Pearse, Dana M. Blumenthal, Jeffrey Corbin, Jeffrey M. Diez, Jeffrey Dukes, David Barnett, Ines Ibanez, Laís Petri, Montserrat Vilà, Bethany A. Bradley
Invasion-mediated mutualism disruption is evident across heterogeneous environmental conditions and varying invasion intensities Invasion-mediated mutualism disruption is evident across heterogeneous environmental conditions and varying invasion intensities
The impact of a biological invasion on native communities is expected to be uneven across invaded landscapes due to differences in local abiotic conditions, invader abundance, and traits and composition of the native community. One way to improve predictive ability about the impact of an invasive species given variable conditions is to exploit known mechanisms driving invasive species'...
Authors
Morgan Roche, Ian S. Pearse, Helen Sofaer, Stephanie N Kivlin, Greg Spyreas, David N. Zaya, Susan Kalisz
Land cover differentially affects abundance of common and rare birds Land cover differentially affects abundance of common and rare birds
While rare species are vulnerable to global change, large declines in common species (i.e., those with large population sizes, large geographic distributions, and/or that are habitat generalists) also are of conservation concern. Understanding if and how commonness mediates species' responses to global change, including land cover change, can help guide conservation strategies. We...
Authors
Kristin P. Davis, Paul C. Banko, Liba Pejchar
Science and Products
Filter Total Items: 25
Data to create and evaluate distribution models for invasive species for different geographic extents Data to create and evaluate distribution models for invasive species for different geographic extents
We developed habitat suitability models for invasive plant species selected by Department of Interior land management agencies. We applied the modeling workflow developed in Young et al. 2020 to species not included in the original case studies. Our methodology balanced trade-offs between developing highly customized models for a few species versus fitting non-specific and generic models...
High-throughput calculations of climatch scores High-throughput calculations of climatch scores
Matching climate envelopes allows people to examine how potential invasive species may match habitats. This repository contains code for using the climatchR package for high-throughput calculations of climatch scores for species using GBIF data. Climatch is based upon the climatch algorithm as implemented through the climatchR package.
Great Basin predicted potential cheatgrass abundance, with model estimation and validation data from 2011-2019 Great Basin predicted potential cheatgrass abundance, with model estimation and validation data from 2011-2019
This data release includes data and metadata describing 1) the rule set used to create vegetation type categories for the Great Basin; 2) estimation and validation data used to fit models of cheatgrass (Bromus tectorum) cover; and 3) mapped predictions of potential cheatgrass abundance.
Presence and abundance data and models for four invasive plant species Presence and abundance data and models for four invasive plant species
We developed habitat suitability models for four invasive plant species of concern to Department of Interior land management agencies. We generally followed the modeling workflow developed in Young et al. 2020, but developed models both for two data types, where species were present and where they were abundant. We developed models using five algorithms with VisTrails: Software for...
climatchR: An implementation of Climatch in R climatchR: An implementation of Climatch in R
Matching climate envelopes of allows people to examine how potential invasive species may match habitats. The Australian government created Climatch to do allow for these comparisons. However, this webpage does not allow for readily scripting climate matching. Hence, the authors created climatchR, an R package (R Core Team 2020) implementing the climatch method in R. This was created to...
Co-occurrence and Occupancy Dynamics of Mourning Doves and Eurasian Collared-Doves Co-occurrence and Occupancy Dynamics of Mourning Doves and Eurasian Collared-Doves
Data on mourning dove and Eurasian collared-dove occurrences, and associated covariates.
Filter Total Items: 44
Observed and potential range shifts of native and non-native species with climate change Observed and potential range shifts of native and non-native species with climate change
There is broad concern that the range shifts of global flora and fauna will not keep up with climate change, increasing the likelihood of population declines and extinctions. Many populations of nonnative species already have advantages over native species, including widespread human-aided dispersal and release from natural enemies. But do nonnative species also have an advantage with...
Authors
Bethany A. Bradley, Evelyn M. Beaury, Belinda Gallardo, Inés Ibáñez, Catherine S. Jarnevich, Toni Lyn Morelli, Helen Sofaer, Cascade J.B. Sorte, Montserrat Vilà
Environmental and geographical factors influence the occurrence and abundance of the southern house mosquito, Culex quinquefasciatus, in Hawai‘i Environmental and geographical factors influence the occurrence and abundance of the southern house mosquito, Culex quinquefasciatus, in Hawai‘i
Hawaiian honeycreepers, a group of endemic Hawaiian forest birds, are being threatened by avian malaria, a non-native disease that is driving honeycreepers populations to extinction. Avian malaria is caused by the parasite Plasmodium relictum, which is transmitted by the invasive mosquito Culex quinquefasciatus. Environmental and geographical factors play an important role in shaping...
Authors
Oswaldo Villena, Katherine Maria McClure, Richard J. Camp, Dennis A. LaPointe, Carter T. Atkinson, Helen Sofaer, Lucas Berio Fortini
The use of semiochemicals for attracting and repelling invasive ambrosia beetles (Coleoptera: Curculionidae) in ʻōhiʻa (Metrosideros polymorpha) forests The use of semiochemicals for attracting and repelling invasive ambrosia beetles (Coleoptera: Curculionidae) in ʻōhiʻa (Metrosideros polymorpha) forests
Early detection of invasive species is critical for preventing ecological and economic damage and maintaining ecosystem health. In Hawaiʻi, a complex of generalist ambrosia beetle species in the tribe Xyleborini (Coleoptera: Scolytinae) are threatening the health and productivity of forests and crops due to their association with tree diseases such as rapid ʻōhiʻa death (ROD) and key...
Authors
Kylle Roy, Helen R. Sofaer, Robert W. Peck, Ellen Dunkle, Dan Mikros, Sheri L. Smith, Matthew D. Ginzel
Macroscale analyses suggest invasive plant impacts depend more on the composition of invading plants than on environmental context Macroscale analyses suggest invasive plant impacts depend more on the composition of invading plants than on environmental context
Aim Native biodiversity is threatened by the spread of non-native invasive species. Many studies demonstrate that invasions reduce local biodiversity but we lack an understanding of how impacts vary across environments at the macroscale. Using ~11,500 vegetation surveys from ecosystems across the United States, we quantified how the relationship between non-native plant cover and native...
Authors
Evelyn M. Beaury, Helen Sofaer, Regan Early, Ian S. Pearse, Dana M. Blumenthal, Jeffrey Corbin, Jeffrey M. Diez, Jeffrey Dukes, David Barnett, Ines Ibanez, Laís Petri, Montserrat Vilà, Bethany A. Bradley
Invasion-mediated mutualism disruption is evident across heterogeneous environmental conditions and varying invasion intensities Invasion-mediated mutualism disruption is evident across heterogeneous environmental conditions and varying invasion intensities
The impact of a biological invasion on native communities is expected to be uneven across invaded landscapes due to differences in local abiotic conditions, invader abundance, and traits and composition of the native community. One way to improve predictive ability about the impact of an invasive species given variable conditions is to exploit known mechanisms driving invasive species'...
Authors
Morgan Roche, Ian S. Pearse, Helen Sofaer, Stephanie N Kivlin, Greg Spyreas, David N. Zaya, Susan Kalisz
Land cover differentially affects abundance of common and rare birds Land cover differentially affects abundance of common and rare birds
While rare species are vulnerable to global change, large declines in common species (i.e., those with large population sizes, large geographic distributions, and/or that are habitat generalists) also are of conservation concern. Understanding if and how commonness mediates species' responses to global change, including land cover change, can help guide conservation strategies. We...
Authors
Kristin P. Davis, Paul C. Banko, Liba Pejchar