Lesley DeFalco
Dr. Lesley DeFalco is a Plant Ecologist with the U.S. Geological Survey's Western Ecological Research Center.
RESEARCH INTERESTS
- Restoration of Aridlands
- Conservation biology
- Desert Community Ecology
- Ecological monitoring
- Effects of Anthropogenic Disturbance
- Evaluation of management
- Fire ecology
- Global climate change
- Invasive species ecology
- Physiological plant ecology
- Plant ecology
- Species interactions
- Threatened and endangered species
EDUCATION
PhD, Ecology, Evolution & Conservation Biology, University of Nevada, Reno, NV 2003
MS, Botany, Colorado State University, Fort Collins, CO 1995
BS, Biological Sciences, Colorado State University, Fort Collins, CO 1989
COMMITTEES
- Botanical Society of America
- California Native Plant Society (Mojave Chapter)
- Ecological Society of America
- Nevada Native Plant Society
- Society for Ecological Restoration (Southwest Chapter)
Science and Products
Supporting energy and mineral development through successful reclamation
Federal lands of the US contain important reserves of oil, gas and other resources important for Unleashing American Energy (SO 3418). After development of these resources is complete, successfully reclaiming disturbed lands is a necessary step towards restoring wildlife habitat, forage production, and maintaining natural resources for future use. To improve reclamation outcomes on these lands and...
WERC Fire Science
WERC scientists are defining the past, present, and future of wildfires for wildlife and human communities. Explore this webpage to learn about specific, ongoing projects across California and parts of Nevada.
Process-based Approaches for Ecological Restoration of Degraded Drylands
Surface disturbances ranging from military training, recreation, energy exploration and development, and wildfires impact a large majority of federal lands in the western US, but the ecological and economic impacts are poorly understood. Explore this webpage to learn how Dr. Lesley DeFalco and her research team are currently evaluating and refining conventional approaches for post-fire restoration...
Native Plant Materials for Ecological Restoration of Degraded Drylands
There is a growing consensus among resource managers to use native plant materials for ecological restoration of degraded drylands. Some plant species may be suitable for re-introduction across broad environmental gradients. Other species may fail under narrower conditions, or their re-introduction may have genetic consequences for local ecotypes, particularly when adapting to future climate...
Conservation of Rare, Sensitive, and At-risk Desert Plant Species
The Mojave Desert is among the hottest and driest of the North American drylands, but in spite of these extreme conditions, and in part because of them, a diverse flora exists. This diversity of rare, endemic, and endangered species is threatened by the complex interaction between fluctuating climate and human-mediated disturbances. USGS studies have identified rare species “hotspots” for planning...
Boulder City Field Station
The Boulder City Field Station supports research scientists leading projects in desert ecosystem restoration, genetics of iconic trees of the Mojave Desert, predator-prey studies on protected lands, and more. Select the next tab for a comprehensive summary of studies at this site.
Models of Future Suitable Habitat for Joshua Trees (Yucca brevifolia, Yucca jaegeriana) in the Mojave and Sonoran Deserts Based on High Resolution Distribution Data Models of Future Suitable Habitat for Joshua Trees (Yucca brevifolia, Yucca jaegeriana) in the Mojave and Sonoran Deserts Based on High Resolution Distribution Data
Joshua trees (Yucca brevifolia, Y. jaegeriana) are iconic, foundational species of the Mojave and Sonoran Deserts in North America. Due to their ecosystem importance, long generation times, and low resilience to disturbance, these hybridizing sister species are increasingly the focus of conservation efforts. Predicting Joshua tree responses to future climate, along with the extent of...
Distribution Data and Habitat Models for Joshua Trees (Yucca brevifolia and Y. jaegeriana) Throughout their Range Distribution Data and Habitat Models for Joshua Trees (Yucca brevifolia and Y. jaegeriana) Throughout their Range
We delineated the existing empirical and modeled ranges of western and eastern Joshua trees (Yucca brevifolia and Y. jaegeriana, respectively) with high fidelity and across their ranges in Arizona, California, Nevada, and Utah, USA. Most species distribution models (SDMs) rely on sparse species occurrence datasets and random pseudoabsences. In contrast, the tall stature and distinctive...
SNP Genotypes for Chylismia brevipes Sampled in the Mojave Desert, 2016-2019 SNP Genotypes for Chylismia brevipes Sampled in the Mojave Desert, 2016-2019
These data show multilocus genotypes for Chylismia brevipes sampled from natural populations throughout the Mojave Desert of California, Nevada, and Arizona from 2016 to 2019. The data release contains two variant call format (.vcf) files with Single-nucleotide polymorphism (SNPs) from single-end Restriction-site associated DNA sequencing (RADSeq), which differ in the restriction enzyme...
Species Distribution Models for Native Species in the Mojave Desert Species Distribution Models for Native Species in the Mojave Desert
Preserving native species diversity is fundamental to ecosystem conservation. Selecting appropriate native species for use in restoration is a critical component of project design and may emphasize species attributes such as life history, functional type, pollinator services, and nutritional value for wildlife. Determining which species are likely to establish and persist in a particular
Mojave Seed Menus: a new spatial tool for restoration software release v1.0 Mojave Seed Menus: a new spatial tool for restoration software release v1.0
Mojave Seed Menus is a spatial decision-support tool designed to help land managers create suitable seed mixes for restoration sites, such as a burned area or other mapped spatial feature. The application provides coverage for the Mojave Desert ecoregion. Seed menus are based on a combination of habitat suitability models for 50 priority restoration plant species. Species are selected...
Ecotypic Variation in Ambrosia dumosa and Larrea tridentata from Three Sites Across the Mojave (2014 - 2018) Ecotypic Variation in Ambrosia dumosa and Larrea tridentata from Three Sites Across the Mojave (2014 - 2018)
These data were acquired from two native Mojave Desert species, Ambrosia dumosa and Larrea tridentata, from 3 sites (50 m x 50 m garden plots) distributed across the differing Mojave Desert ecotones. These sites were located on the Fort Irwin National Training Center (CA), north of Joshua Tree National Park (CA), and north of Saint George (UT). Growth and survivorship data were collected...
Filter Total Items: 66
Cryptic CAM photosynthesis in Joshua tree (Yucca brevifolia, Y. jaegeriana) Cryptic CAM photosynthesis in Joshua tree (Yucca brevifolia, Y. jaegeriana)
Joshua trees are long-lived perennial monocots native to the Mojave Desert in North America. Composed of two species, Yucca brevifolia and Y. jaegeriana (Asparagaceae), Joshua trees are imperiled by climate change, with decreases in suitable habitat predicted under future climate change scenarios. Relatively little is understood about the ecophysiology of Joshua trees across their range...
Authors
Karolina Heyduk, Sara J. Scoles-Sciulla, Bridget Hennessy, Madeline Czymmek, Edward V. McAssey, Chase Kane, G. Young Kim, Ifeoluwa Sogunle, Lulu Heublein, Dhriti Sriram, Bryan MacNeill, Michael T. Hren, Todd C. Esque, Jeremy B. Yoder, Michael R. McKain, Christopher Irwin Smith, Lesley A. DeFalco
Assessing uncertainty in forecasts of refugia for Joshua trees using high-density distribution data Assessing uncertainty in forecasts of refugia for Joshua trees using high-density distribution data
Joshua trees (Yucca brevifolia and Yucca jaegeriana) are iconic, foundational species of the Mojave and Sonoran Deserts in North America. Due to their ecosystem importance, long generation times, and low resilience to disturbance, these hybridizing sister species are increasingly the focus of conservation efforts. Predicting Joshua tree responses to impending climate variability, along...
Authors
Daniel F. Shryock, Todd Esque, Gabrielle A. Berr, Lesley A. DeFalco
Reproductive output of the rare plant Arctomecon californica does not appear to be limited by its floral visitor community Reproductive output of the rare plant Arctomecon californica does not appear to be limited by its floral visitor community
The majority of plants rely on animal-mediated pollination for reproduction. Reductions in pollinator visitations can lead to pollen limitation and declines in seed production. Arctomecon californica, the Las Vegas bearpoppy, is a rare plant native to the northeastern Mojave Desert. It is pollinator dependent for reproduction as it is self-incompatible, but associated pollinator...
Authors
Kelsey K. Graham, Lesley A. DeFalco, Terry Griswold
Concordant signal of genetic variation across marker densities in the desert annual Chylismia brevipes is linked with timing of winter precipitation Concordant signal of genetic variation across marker densities in the desert annual Chylismia brevipes is linked with timing of winter precipitation
Climate change coupled with large-scale surface disturbances necessitate active restoration strategies to promote resilient and genetically diverse native plant communities. However, scarcity of native plant materials hinders restoration efforts, leading practitioners to choose from potentially viable but nonlocal seed sources. Genome scans for genetic variation linked with selective...
Authors
Daniel F. Shryock, Nila Lê, Lesley A. DeFalco, Todd Esque
Unprecedented distribution data for Joshua trees (Yucca brevifolia and Y. jaegeriana) reveal contemporary climate associations of a Mojave Desert icon Unprecedented distribution data for Joshua trees (Yucca brevifolia and Y. jaegeriana) reveal contemporary climate associations of a Mojave Desert icon
Introduction: Forecasting range shifts in response to climate change requires accurate species distribution models (SDMs), particularly at the margins of species' ranges. However, most studies producing SDMs rely on sparse species occurrence datasets from herbarium records and public databases, along with random pseudoabsences. While environmental covariates used to fit SDMS are...
Authors
Todd Esque, Daniel F. Shryock, Gabrielle A. Berr, Felicia Chen, Lesley A. DeFalco, Sabrina Mae Lewicki, Brent Lee Cunningham, Eddie J. Gaylord, Caitlin Shannon Poage, Gretchen Elizabeth Gantz, Ross Adrian Van Gaalen, Benjamin O Gottsacker, Amanda Marie Mcdonald, J.B. Yoder, C.I. Smith, K.E. Nussear
Soil medium and watering frequency alter growth and allocation for Blue Diamond cholla (Cylindropuntia multigeniculata), a rare cactus of the northeast Mojave Desert, USA Soil medium and watering frequency alter growth and allocation for Blue Diamond cholla (Cylindropuntia multigeniculata), a rare cactus of the northeast Mojave Desert, USA
Blue Diamond cholla (Cylindropuntia multigeniculata (Clokey) Blackb. [Cactaceae]) is a rare cactus of the Mojave Desert. We explored whether cultivation from joint cuttings is a viable method for supporting threatened populations. Terminal joints were collected from adult plants at the type locality and grown in a shade house: We tested whether 2 soil mixes that varied in the ratio of...
Authors
Sara J. Scoles-Sciulla, Alexander Stosich, Lesley A. DeFalco
Mojave Seed Menus: a new spatial tool for restoration software release v1.0 Mojave Seed Menus: a new spatial tool for restoration software release v1.0
Mojave Seed Menus is a spatial decision-support tool designed to help land managers create suitable seed mixes for restoration sites, such as a burned area or other mapped spatial feature. The application provides coverage for the Mojave Desert ecoregion. Seed menus are based on a combination of habitat suitability models for 50 priority restoration plant species. Species are selected...
Science and Products
Supporting energy and mineral development through successful reclamation
Federal lands of the US contain important reserves of oil, gas and other resources important for Unleashing American Energy (SO 3418). After development of these resources is complete, successfully reclaiming disturbed lands is a necessary step towards restoring wildlife habitat, forage production, and maintaining natural resources for future use. To improve reclamation outcomes on these lands and...
WERC Fire Science
WERC scientists are defining the past, present, and future of wildfires for wildlife and human communities. Explore this webpage to learn about specific, ongoing projects across California and parts of Nevada.
Process-based Approaches for Ecological Restoration of Degraded Drylands
Surface disturbances ranging from military training, recreation, energy exploration and development, and wildfires impact a large majority of federal lands in the western US, but the ecological and economic impacts are poorly understood. Explore this webpage to learn how Dr. Lesley DeFalco and her research team are currently evaluating and refining conventional approaches for post-fire restoration...
Native Plant Materials for Ecological Restoration of Degraded Drylands
There is a growing consensus among resource managers to use native plant materials for ecological restoration of degraded drylands. Some plant species may be suitable for re-introduction across broad environmental gradients. Other species may fail under narrower conditions, or their re-introduction may have genetic consequences for local ecotypes, particularly when adapting to future climate...
Conservation of Rare, Sensitive, and At-risk Desert Plant Species
The Mojave Desert is among the hottest and driest of the North American drylands, but in spite of these extreme conditions, and in part because of them, a diverse flora exists. This diversity of rare, endemic, and endangered species is threatened by the complex interaction between fluctuating climate and human-mediated disturbances. USGS studies have identified rare species “hotspots” for planning...
Boulder City Field Station
The Boulder City Field Station supports research scientists leading projects in desert ecosystem restoration, genetics of iconic trees of the Mojave Desert, predator-prey studies on protected lands, and more. Select the next tab for a comprehensive summary of studies at this site.
Models of Future Suitable Habitat for Joshua Trees (Yucca brevifolia, Yucca jaegeriana) in the Mojave and Sonoran Deserts Based on High Resolution Distribution Data Models of Future Suitable Habitat for Joshua Trees (Yucca brevifolia, Yucca jaegeriana) in the Mojave and Sonoran Deserts Based on High Resolution Distribution Data
Joshua trees (Yucca brevifolia, Y. jaegeriana) are iconic, foundational species of the Mojave and Sonoran Deserts in North America. Due to their ecosystem importance, long generation times, and low resilience to disturbance, these hybridizing sister species are increasingly the focus of conservation efforts. Predicting Joshua tree responses to future climate, along with the extent of...
Distribution Data and Habitat Models for Joshua Trees (Yucca brevifolia and Y. jaegeriana) Throughout their Range Distribution Data and Habitat Models for Joshua Trees (Yucca brevifolia and Y. jaegeriana) Throughout their Range
We delineated the existing empirical and modeled ranges of western and eastern Joshua trees (Yucca brevifolia and Y. jaegeriana, respectively) with high fidelity and across their ranges in Arizona, California, Nevada, and Utah, USA. Most species distribution models (SDMs) rely on sparse species occurrence datasets and random pseudoabsences. In contrast, the tall stature and distinctive...
SNP Genotypes for Chylismia brevipes Sampled in the Mojave Desert, 2016-2019 SNP Genotypes for Chylismia brevipes Sampled in the Mojave Desert, 2016-2019
These data show multilocus genotypes for Chylismia brevipes sampled from natural populations throughout the Mojave Desert of California, Nevada, and Arizona from 2016 to 2019. The data release contains two variant call format (.vcf) files with Single-nucleotide polymorphism (SNPs) from single-end Restriction-site associated DNA sequencing (RADSeq), which differ in the restriction enzyme...
Species Distribution Models for Native Species in the Mojave Desert Species Distribution Models for Native Species in the Mojave Desert
Preserving native species diversity is fundamental to ecosystem conservation. Selecting appropriate native species for use in restoration is a critical component of project design and may emphasize species attributes such as life history, functional type, pollinator services, and nutritional value for wildlife. Determining which species are likely to establish and persist in a particular
Mojave Seed Menus: a new spatial tool for restoration software release v1.0 Mojave Seed Menus: a new spatial tool for restoration software release v1.0
Mojave Seed Menus is a spatial decision-support tool designed to help land managers create suitable seed mixes for restoration sites, such as a burned area or other mapped spatial feature. The application provides coverage for the Mojave Desert ecoregion. Seed menus are based on a combination of habitat suitability models for 50 priority restoration plant species. Species are selected...
Ecotypic Variation in Ambrosia dumosa and Larrea tridentata from Three Sites Across the Mojave (2014 - 2018) Ecotypic Variation in Ambrosia dumosa and Larrea tridentata from Three Sites Across the Mojave (2014 - 2018)
These data were acquired from two native Mojave Desert species, Ambrosia dumosa and Larrea tridentata, from 3 sites (50 m x 50 m garden plots) distributed across the differing Mojave Desert ecotones. These sites were located on the Fort Irwin National Training Center (CA), north of Joshua Tree National Park (CA), and north of Saint George (UT). Growth and survivorship data were collected...
Filter Total Items: 66
Cryptic CAM photosynthesis in Joshua tree (Yucca brevifolia, Y. jaegeriana) Cryptic CAM photosynthesis in Joshua tree (Yucca brevifolia, Y. jaegeriana)
Joshua trees are long-lived perennial monocots native to the Mojave Desert in North America. Composed of two species, Yucca brevifolia and Y. jaegeriana (Asparagaceae), Joshua trees are imperiled by climate change, with decreases in suitable habitat predicted under future climate change scenarios. Relatively little is understood about the ecophysiology of Joshua trees across their range...
Authors
Karolina Heyduk, Sara J. Scoles-Sciulla, Bridget Hennessy, Madeline Czymmek, Edward V. McAssey, Chase Kane, G. Young Kim, Ifeoluwa Sogunle, Lulu Heublein, Dhriti Sriram, Bryan MacNeill, Michael T. Hren, Todd C. Esque, Jeremy B. Yoder, Michael R. McKain, Christopher Irwin Smith, Lesley A. DeFalco
Assessing uncertainty in forecasts of refugia for Joshua trees using high-density distribution data Assessing uncertainty in forecasts of refugia for Joshua trees using high-density distribution data
Joshua trees (Yucca brevifolia and Yucca jaegeriana) are iconic, foundational species of the Mojave and Sonoran Deserts in North America. Due to their ecosystem importance, long generation times, and low resilience to disturbance, these hybridizing sister species are increasingly the focus of conservation efforts. Predicting Joshua tree responses to impending climate variability, along...
Authors
Daniel F. Shryock, Todd Esque, Gabrielle A. Berr, Lesley A. DeFalco
Reproductive output of the rare plant Arctomecon californica does not appear to be limited by its floral visitor community Reproductive output of the rare plant Arctomecon californica does not appear to be limited by its floral visitor community
The majority of plants rely on animal-mediated pollination for reproduction. Reductions in pollinator visitations can lead to pollen limitation and declines in seed production. Arctomecon californica, the Las Vegas bearpoppy, is a rare plant native to the northeastern Mojave Desert. It is pollinator dependent for reproduction as it is self-incompatible, but associated pollinator...
Authors
Kelsey K. Graham, Lesley A. DeFalco, Terry Griswold
Concordant signal of genetic variation across marker densities in the desert annual Chylismia brevipes is linked with timing of winter precipitation Concordant signal of genetic variation across marker densities in the desert annual Chylismia brevipes is linked with timing of winter precipitation
Climate change coupled with large-scale surface disturbances necessitate active restoration strategies to promote resilient and genetically diverse native plant communities. However, scarcity of native plant materials hinders restoration efforts, leading practitioners to choose from potentially viable but nonlocal seed sources. Genome scans for genetic variation linked with selective...
Authors
Daniel F. Shryock, Nila Lê, Lesley A. DeFalco, Todd Esque
Unprecedented distribution data for Joshua trees (Yucca brevifolia and Y. jaegeriana) reveal contemporary climate associations of a Mojave Desert icon Unprecedented distribution data for Joshua trees (Yucca brevifolia and Y. jaegeriana) reveal contemporary climate associations of a Mojave Desert icon
Introduction: Forecasting range shifts in response to climate change requires accurate species distribution models (SDMs), particularly at the margins of species' ranges. However, most studies producing SDMs rely on sparse species occurrence datasets from herbarium records and public databases, along with random pseudoabsences. While environmental covariates used to fit SDMS are...
Authors
Todd Esque, Daniel F. Shryock, Gabrielle A. Berr, Felicia Chen, Lesley A. DeFalco, Sabrina Mae Lewicki, Brent Lee Cunningham, Eddie J. Gaylord, Caitlin Shannon Poage, Gretchen Elizabeth Gantz, Ross Adrian Van Gaalen, Benjamin O Gottsacker, Amanda Marie Mcdonald, J.B. Yoder, C.I. Smith, K.E. Nussear
Soil medium and watering frequency alter growth and allocation for Blue Diamond cholla (Cylindropuntia multigeniculata), a rare cactus of the northeast Mojave Desert, USA Soil medium and watering frequency alter growth and allocation for Blue Diamond cholla (Cylindropuntia multigeniculata), a rare cactus of the northeast Mojave Desert, USA
Blue Diamond cholla (Cylindropuntia multigeniculata (Clokey) Blackb. [Cactaceae]) is a rare cactus of the Mojave Desert. We explored whether cultivation from joint cuttings is a viable method for supporting threatened populations. Terminal joints were collected from adult plants at the type locality and grown in a shade house: We tested whether 2 soil mixes that varied in the ratio of...
Authors
Sara J. Scoles-Sciulla, Alexander Stosich, Lesley A. DeFalco
Mojave Seed Menus: a new spatial tool for restoration software release v1.0 Mojave Seed Menus: a new spatial tool for restoration software release v1.0
Mojave Seed Menus is a spatial decision-support tool designed to help land managers create suitable seed mixes for restoration sites, such as a burned area or other mapped spatial feature. The application provides coverage for the Mojave Desert ecoregion. Seed menus are based on a combination of habitat suitability models for 50 priority restoration plant species. Species are selected...