Rob Massatti, Ph.D. (Former Employee)
Science and Products
Informing the use of native plant materials in restoration and rehabilitation with the Native Plant Seed Mapping Toolkit
Restoring ecosystems using native plant materials is a critical pursuit of federal land management agencies following natural disasters and disturbances. The Native Plant Seed Mapping Toolkit provides practitioners with quantitative data to support successful restoration outcomes.
Informing seed transfer guidelines and native plant materials development
As restoration needs for natural landscapes grow due to higher frequency and/or intensity disturbances, pressure from invasive species, and impacts resulting from changing climates, considerable time and resources are being invested to guide the development and deployment of native plant materials (NPMs). Across lower elevations of the Colorado Plateau, a region composed primarily of public land...
Genetics for Western Restoration and Conservation (GWRC)
Research using genetic principles, methods, and data provides critical information for restoration and conservation science. Genetic research may rely only upon genomic sequencing techniques, which generate abundant, genome-wide DNA sequences that can provide a glimpse into a species’ evolutionary history and adaptations. Genetic research may also look at an organism’s physical traits to...
Genomic Research Supporting Western Conservation
In the western United States (U.S.), there are many regionally restricted, rare species resulting from complex demographic and ecological processes through time. In addition to the inherent risks associated with being rare (i.e., having few individuals spread over a limited area that could be disproportionately affected by chance events), anthropogenic disturbances are increasing in magnitude...
Filter Total Items: 13
Genomic data for rabbitbrush and big sagebrush plant communities in western North America (2017 - 2019) and Fendler’s globemallow in New Mexico (2022) Genomic data for rabbitbrush and big sagebrush plant communities in western North America (2017 - 2019) and Fendler’s globemallow in New Mexico (2022)
These data were compiled to highlight hybridization mosaics and genotype-environment associations across three study systems containing taxa critical to widespread plant communities in western North America: Artemisia tridentata, Ericameria nauseosa, and Sphaeralcea fendleri. Objective(s) of our study were to: (1) use genomic data to identify divergent evolutionary lineages (hereafter...
Gila spp. (bonytail chub, humpback chub, and roundtail chub) genomic data from various locations including the Colorado River in the Grand Canyon (2020-2024) Gila spp. (bonytail chub, humpback chub, and roundtail chub) genomic data from various locations including the Colorado River in the Grand Canyon (2020-2024)
These data were compiled to investigate genomic patterns in humpback chub (Gila cypha) sampled from various locations (New Mexico and Utah) including the Colorado River in the Grand Canyon, AZ. Specifically, our objectives were to understand 1) if unique genetic variation persisted in the western Grand Canyon during the period when chub was restricted to warm water refugia and 2) if a...
Disturbance, energy, climate partitions, cultivars and species habitat data for the Colorado Plateau and environs Disturbance, energy, climate partitions, cultivars and species habitat data for the Colorado Plateau and environs
These data were compiled to support and inform the Bureau of Land Management’s Colorado Plateau Native Plant Program and to guide future management action when selecting regions to collect and increase seed for native plant materials development. The objective of our study was to develop geospatial datasets to aid land managers and restoration practitioners in identifying areas that will...
Genetically informed seed transfer zones for Astragalus lonchocarpus, Cleome serrulata, and Heliomeris multiflora across the Colorado Plateau and adjacent regions Genetically informed seed transfer zones for Astragalus lonchocarpus, Cleome serrulata, and Heliomeris multiflora across the Colorado Plateau and adjacent regions
These data were compiled to provide seed transfer and native plant materials development guidance to managers and practitioners across the Colorado Plateau and in adjacent regions. This data release contains empirical seed transfer zones derived from molecular genetic data for Cleome serrulata (syn. Peritoma serrulata), Heliomeris multiflora, and Astragalus lonchocarpus. These species...
Carex specuicola genomic data for the southern Colorado Plateau Desert Carex specuicola genomic data for the southern Colorado Plateau Desert
These data were compiled to investigate the demographic and phylogeographic of Carex specuicola. Objectives of our study were to understand the demographic and dispersal history of Carex specuicola across hanging gardens, the hybridization history between Carex specuicola and Carex utahensis, and the population structure of Carex specuicola across its distribution. The data release...
POPMAPS: An R package to estimate ancestry probability surfaces POPMAPS: An R package to estimate ancestry probability surfaces
This software code was developed to estimate the probability that individuals found at a geographic location will belong to the same genetic cluster as individuals at the nearest empirical sampling location for which ancestry is known. POPMAPS includes 5 main functions to calculate and visualize these results (see Table 1 for functions and arguments). Population assignment coefficients...
Penstemon grahamii genetic data from a dryland region of the western United States Penstemon grahamii genetic data from a dryland region of the western United States
These data were compiled to investigate the evolutionary history of Graham's beardtongue (Penstemon grahamii). Objective(s) of our study were to determine the evolutionary history of P. grahamii, including ancestral population sizes, the history of population divergences, and historical connectivity. In addition, we characterized population structure, genetic diversity summary statistics...
Astragalus species complex genetic data from southeast Utah (Grand County and San Juan County), USA Astragalus species complex genetic data from southeast Utah (Grand County and San Juan County), USA
These data were compiled to investigate the evolutionary history of Astragalus iselyi, A. sabulosus var. sabulosus, and A. sabulosus var. vehiculus. The data release consists of six text files. One file is a bash script (astragalus_MLE_msms.sh) for generating simulated genetic data. Four files contain individual-level (astragalus.fasta, astragalus.nothin.recode.vcf, astragalus.recode.vcf...
Cleome lutea and Machaeranthera canescens seed transfer zones and distribution on the Colorado Plateau, US Cleome lutea and Machaeranthera canescens seed transfer zones and distribution on the Colorado Plateau, US
These data were compiled to provide seed transfer and native plant materials development guidance to managers and practitioners across the Colorado Plateau and in adjacent regions. This data release contains empirical seed transfer zones derived from molecular genetic data for Cleome lutea (syn. Peritoma lutea) and Machaeranthera canescens (syn. Dieteria canescens). These species show...
'Viva' native plant material data in support of restoration and conservation 'Viva' native plant material data in support of restoration and conservation
These data were compiled to investigate the evolutionary history of Hilaria jamesii, Hilaria mutica, and Hilaria rigida. The data release consists of two tab delimited text files that may be used to infer population structure (viva_structure.stru) or relationships among sampling localities (viva.phylip). Files record genetic variation on an individual (.stru) or sampling locality (...
Population genetic and climatic variability data across western North America, 1915-2015 Population genetic and climatic variability data across western North America, 1915-2015
Environmental Analysis Data: These data were compiled to investigate the complex interactions between environmental gradients and geographic distance across the Intermountain West of the western United States. Due to complex topography, physiographic heterogeneity, and complicated relationships with large bodies of water, spatial autocorrelation of environmental similarity may be...
Hilaria jamesii data for the Colorado Plateau of the southwestern United States Hilaria jamesii data for the Colorado Plateau of the southwestern United States
These data were compiled to investigate the demographic, phylogeographic, and adaptation history of Hilaria jamesii. The data release consists of three tab delimited text files that may be used to infer population structure or putative adaptive loci (hija_adaptation_dataset.stru), relationships among sampling localities (hija_phylogeny_dataset.phylip), or genetic diversity statistics...
Filter Total Items: 28
Bridging theory and practice to inform seed selection for restoration Bridging theory and practice to inform seed selection for restoration
Introduction Land managers often face the critical decision of what plant materials to select for ecological restoration. Selection depends on factors that span ecological conditions and human interventions in the restoration process, which can strongly influence the recovery of a degraded ecosystem. Objectives To improve the seed selection process, we compared scientific literature and...
Authors
Laura Cecilia Shriver, Samuel E. Jordan, Robert Massatti, Seth Munson
Suturing fragmented landscapes: Mosaic hybrid zones in plants may facilitate ecosystem resiliency Suturing fragmented landscapes: Mosaic hybrid zones in plants may facilitate ecosystem resiliency
Many widespread plant taxa of western North America have diversified into phenotypically and genetically divergent lineages due to complex biogeographic histories across heterogeneous landscapes. Mosaic hybrid zones can form when geographically co-occurring, yet environmentally distinct, lineages cross-pollinate and form hybrids that occupy unique environmental niches absent of a...
Authors
Robert Massatti, Trevor Morgan Faske, Ivana M. Barnes, Elizabeth A. Leger, Thomas L. Parchman, Bryce A. Richardson, L. Lacey Knowles
Genetic structure of an expanding population of Humpback Chub in Grand Canyon Genetic structure of an expanding population of Humpback Chub in Grand Canyon
Objective Humpback Chub (HBC) Gila cypha in Grand Canyon declined in abundance and distribution over the latter part of the 20th century but have substantially increased in abundance and distribution over the past two decades. Although previous genetic work suggested that HBC in Grand Canyon belong to one genetic group, here we evaluate the genetic structure of HBC in Grand Canyon to...
Authors
Maria C. Dzul, Robert Massatti, Charles Yackulic, Emily Omana-Smith, Kirk Young
The cost of self-defense: Browsing effects in the rare plant species Salix arizonica The cost of self-defense: Browsing effects in the rare plant species Salix arizonica
Coevolution between plants and their animal predators has led to diverse defensive adaptations. Multiple theories of defense propose that there are resource allocation costs associated with producing chemical defenses. One leading hypothesis, optimal defense theory (ODT), suggests that natural selection will result in the allocation of resources to defenses that optimize the cost-to...
Authors
Shannon J. Lencioni, Robert Massatti, Ken Keefover-Ring, Liza M. Holeski
Intraspecific trait variability in wild populations predicts neither variability nor performance in a common garden Intraspecific trait variability in wild populations predicts neither variability nor performance in a common garden
Dryland restoration requires plant materials capable of performing well despite difficult growing conditions. Selecting plant materials with higher intraspecific trait variability (ITV) may support successful outcomes by enhancing the performance of those materials in restoration settings. However, maintaining ITV from wild populations is not well understood and requires further...
Authors
Ella M. Samuel, Rachel M. Mitchell, Daniel E. Winkler, Zoe M. Davidson, Shannon Joy Lencioni, Robert Massatti
Matching existing and future native plant materials to disturbance-driven restoration needs Matching existing and future native plant materials to disturbance-driven restoration needs
Assessing the appropriateness of existing native plant materials can both determine which seed source to utilize for restoration projects, and identify locations for which new seed sources need to be developed. Here, we demonstrate an approach to meet these needs. This method identifies areas of high restoration need based on disturbance patterns, assesses the regional suitability of...
Authors
Daniel E. Winkler, Sarah Sterner, John B. Bradford, Adrienne M. Pilmanis, Robert Massatti
Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2022 Report) Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2022 Report)
A primary focus of the Colorado Plateau Native Plant Program (CPNPP) is to identify and develop appropriate native plant materials (NPMs) for current and future restoration projects. Multiple efforts have characterized the myriad challenges inherent in providing appropriate seed resources to enable effective, widespread restoration and have identified a broad suite of research activities...
Authors
Robert Massatti, Daniel E. Winkler, Sasha C. Reed, Michael C. Duniway, Seth M. Munson, John B. Bradford
Evolutionary dynamics inform management interventions of a hanging garden obligate, Carex specuicola Evolutionary dynamics inform management interventions of a hanging garden obligate, Carex specuicola
Uncovering the historical and contemporary processes shaping rare species with complex distributions is of growing importance due to threats such as habitat destruction and climate change. Species restricted to specialized, patchy habitat may persist by virtue of life history characteristics facilitating ongoing gene flow and dispersal, but they could also reflect the remnants of...
Authors
Kenneth James Chapin, Matthew R Jones, Daniel E. Winkler, Glenn Rink, Robert Massatti
Assessing population genomic structure and polyploidy: A crucial step for native plant restoration Assessing population genomic structure and polyploidy: A crucial step for native plant restoration
Establishing an effective restoration program requires baseline genetic information to make sound decisions for seed increase and transfer. For many plants this information is lacking, especially among native forbs that are critical for pollinator health. Erigeron speciosus is a widespread, perennial forb occupying montane environments in the western United States and Canada. This...
Authors
Bryce A. Richardson, Robert Massatti, Nurul Islam-Faridi, Skylar Johnson, Francis F. Kilkenny
Spatially explicit management of genetic diversity using ancestry probability surfaces Spatially explicit management of genetic diversity using ancestry probability surfaces
1. Ecological restoration and conservation efforts are increasing worldwide and the management of intraspecific genetic variation in plants and animals, an important component of biodiversity, is increasingly valued. As a result, tailorable, spatially explicit approaches to map genetic variation are needed to support decision-making and management frameworks related to the recovery of...
Authors
Robert Massatti, Daniel E. Winkler
Hybrid enrichment of adaptive variation revealed by genotype-environment associations in montane sedges Hybrid enrichment of adaptive variation revealed by genotype-environment associations in montane sedges
The role of hybridization in diversification is complex and may result in many possible outcomes. Not only can hybridization produce new lineages, but those lineages may contain unique combinations of adaptive genetic variation derived from parental taxa that allow hybrid-origin lineages to occupy unique environmental space relative to one (or both) parents. We document such a case of
Authors
Richard G.J. Hodel, Robert Massatti, L Lacey Knowles
Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2021 Report) Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2021 Report)
A primary focus of the Colorado Plateau Native Plant Program (CPNPP) is to identify and develop appropriate native plant materials (NPMs) for current and future restoration projects. Multiple efforts have characterized the myriad challenges inherent in providing appropriate seed resources to enable effective, widespread restoration and have identified a broad suite of research activities...
Authors
Robert Massatti, Daniel E. Winkler, Sasha C. Reed, Michael C. Duniway, Seth M. Munson, John B. Bradford
Non-USGS Publications**
Massatti, R., Doherty, K.D. and Wood, T.E. (2018), Resolving neutral and deterministic contributions to genomic structure in Syntrichia ruralis (Bryophyta, Pottiaceae) informs propagule sourcing for dryland restoration. Conservation Genetics, 19: 85.
Knowles, L. L. and Massatti, R. (2017), Distributional shifts – not geographic isolation – as a probable driver of montane species divergence. Ecography, 40: 1475-1485.
Massatti, R. and Knowles, L. L. (2016), Contrasting support for alternative models of genomic variation based on microhabitat preference: species‐specific effects of climate change in alpine sedges. Molecular Ecology, 25: 3974-3986.
Knowles, L. L., Massatti, R. , He, Q. , Olson, L. E. and Lanier, H. C. (2016), Quantifying the similarity between genes and geography across Alaska's alpine small mammals. Journal of Biogeography, 43: 1464-1476.
Massatti, R. , Reznicek, A. A. and Knowles, L. L. (2016), Utilizing RADseq data for phylogenetic analysis of challenging taxonomic groups: A case study in Carex sect. Racemosae. American Journal of Botany, 103: 337-347.
Lanier, H. C., Massatti, R. , He, Q. , Olson, L. E. and Knowles, L. L. (2015), Colonization from divergent ancestors: glaciation signatures on contemporary patterns of genomic variation in Collared Pikas (Ochotona collaris). Molecular Ecology, 24: 3688-3705.
Massatti, R. and Knowles, L. L. (2014), Microhabitat differences impact phylogeographic concordance of codistributed species: genomic evidence in montane sedges (Carex L.) from the Rocky Mountains. Evolution, 68: 2833-2846.
Coop, J. D., Massatti, R. T. and Schoettle, A. W. (2010), Subalpine vegetation pattern three decades after stand‐replacing fire: effects of landscape context and topography on plant community composition, tree regeneration, and diversity. Journal of Vegetation Science, 21: 472- 487.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
POPMAPS: An R package to estimate ancestry probability surfaces POPMAPS: An R package to estimate ancestry probability surfaces
This software code was developed to estimate the probability that individuals found at a geographic location will belong to the same genetic cluster as individuals at the nearest empirical sampling location for which ancestry is known. POPMAPS includes 5 main functions to calculate and visualize these results (see Table 1 for functions and arguments). Population assignment coefficients...
Science and Products
Informing the use of native plant materials in restoration and rehabilitation with the Native Plant Seed Mapping Toolkit
Restoring ecosystems using native plant materials is a critical pursuit of federal land management agencies following natural disasters and disturbances. The Native Plant Seed Mapping Toolkit provides practitioners with quantitative data to support successful restoration outcomes.
Informing seed transfer guidelines and native plant materials development
As restoration needs for natural landscapes grow due to higher frequency and/or intensity disturbances, pressure from invasive species, and impacts resulting from changing climates, considerable time and resources are being invested to guide the development and deployment of native plant materials (NPMs). Across lower elevations of the Colorado Plateau, a region composed primarily of public land...
Genetics for Western Restoration and Conservation (GWRC)
Research using genetic principles, methods, and data provides critical information for restoration and conservation science. Genetic research may rely only upon genomic sequencing techniques, which generate abundant, genome-wide DNA sequences that can provide a glimpse into a species’ evolutionary history and adaptations. Genetic research may also look at an organism’s physical traits to...
Genomic Research Supporting Western Conservation
In the western United States (U.S.), there are many regionally restricted, rare species resulting from complex demographic and ecological processes through time. In addition to the inherent risks associated with being rare (i.e., having few individuals spread over a limited area that could be disproportionately affected by chance events), anthropogenic disturbances are increasing in magnitude...
Filter Total Items: 13
Genomic data for rabbitbrush and big sagebrush plant communities in western North America (2017 - 2019) and Fendler’s globemallow in New Mexico (2022) Genomic data for rabbitbrush and big sagebrush plant communities in western North America (2017 - 2019) and Fendler’s globemallow in New Mexico (2022)
These data were compiled to highlight hybridization mosaics and genotype-environment associations across three study systems containing taxa critical to widespread plant communities in western North America: Artemisia tridentata, Ericameria nauseosa, and Sphaeralcea fendleri. Objective(s) of our study were to: (1) use genomic data to identify divergent evolutionary lineages (hereafter...
Gila spp. (bonytail chub, humpback chub, and roundtail chub) genomic data from various locations including the Colorado River in the Grand Canyon (2020-2024) Gila spp. (bonytail chub, humpback chub, and roundtail chub) genomic data from various locations including the Colorado River in the Grand Canyon (2020-2024)
These data were compiled to investigate genomic patterns in humpback chub (Gila cypha) sampled from various locations (New Mexico and Utah) including the Colorado River in the Grand Canyon, AZ. Specifically, our objectives were to understand 1) if unique genetic variation persisted in the western Grand Canyon during the period when chub was restricted to warm water refugia and 2) if a...
Disturbance, energy, climate partitions, cultivars and species habitat data for the Colorado Plateau and environs Disturbance, energy, climate partitions, cultivars and species habitat data for the Colorado Plateau and environs
These data were compiled to support and inform the Bureau of Land Management’s Colorado Plateau Native Plant Program and to guide future management action when selecting regions to collect and increase seed for native plant materials development. The objective of our study was to develop geospatial datasets to aid land managers and restoration practitioners in identifying areas that will...
Genetically informed seed transfer zones for Astragalus lonchocarpus, Cleome serrulata, and Heliomeris multiflora across the Colorado Plateau and adjacent regions Genetically informed seed transfer zones for Astragalus lonchocarpus, Cleome serrulata, and Heliomeris multiflora across the Colorado Plateau and adjacent regions
These data were compiled to provide seed transfer and native plant materials development guidance to managers and practitioners across the Colorado Plateau and in adjacent regions. This data release contains empirical seed transfer zones derived from molecular genetic data for Cleome serrulata (syn. Peritoma serrulata), Heliomeris multiflora, and Astragalus lonchocarpus. These species...
Carex specuicola genomic data for the southern Colorado Plateau Desert Carex specuicola genomic data for the southern Colorado Plateau Desert
These data were compiled to investigate the demographic and phylogeographic of Carex specuicola. Objectives of our study were to understand the demographic and dispersal history of Carex specuicola across hanging gardens, the hybridization history between Carex specuicola and Carex utahensis, and the population structure of Carex specuicola across its distribution. The data release...
POPMAPS: An R package to estimate ancestry probability surfaces POPMAPS: An R package to estimate ancestry probability surfaces
This software code was developed to estimate the probability that individuals found at a geographic location will belong to the same genetic cluster as individuals at the nearest empirical sampling location for which ancestry is known. POPMAPS includes 5 main functions to calculate and visualize these results (see Table 1 for functions and arguments). Population assignment coefficients...
Penstemon grahamii genetic data from a dryland region of the western United States Penstemon grahamii genetic data from a dryland region of the western United States
These data were compiled to investigate the evolutionary history of Graham's beardtongue (Penstemon grahamii). Objective(s) of our study were to determine the evolutionary history of P. grahamii, including ancestral population sizes, the history of population divergences, and historical connectivity. In addition, we characterized population structure, genetic diversity summary statistics...
Astragalus species complex genetic data from southeast Utah (Grand County and San Juan County), USA Astragalus species complex genetic data from southeast Utah (Grand County and San Juan County), USA
These data were compiled to investigate the evolutionary history of Astragalus iselyi, A. sabulosus var. sabulosus, and A. sabulosus var. vehiculus. The data release consists of six text files. One file is a bash script (astragalus_MLE_msms.sh) for generating simulated genetic data. Four files contain individual-level (astragalus.fasta, astragalus.nothin.recode.vcf, astragalus.recode.vcf...
Cleome lutea and Machaeranthera canescens seed transfer zones and distribution on the Colorado Plateau, US Cleome lutea and Machaeranthera canescens seed transfer zones and distribution on the Colorado Plateau, US
These data were compiled to provide seed transfer and native plant materials development guidance to managers and practitioners across the Colorado Plateau and in adjacent regions. This data release contains empirical seed transfer zones derived from molecular genetic data for Cleome lutea (syn. Peritoma lutea) and Machaeranthera canescens (syn. Dieteria canescens). These species show...
'Viva' native plant material data in support of restoration and conservation 'Viva' native plant material data in support of restoration and conservation
These data were compiled to investigate the evolutionary history of Hilaria jamesii, Hilaria mutica, and Hilaria rigida. The data release consists of two tab delimited text files that may be used to infer population structure (viva_structure.stru) or relationships among sampling localities (viva.phylip). Files record genetic variation on an individual (.stru) or sampling locality (...
Population genetic and climatic variability data across western North America, 1915-2015 Population genetic and climatic variability data across western North America, 1915-2015
Environmental Analysis Data: These data were compiled to investigate the complex interactions between environmental gradients and geographic distance across the Intermountain West of the western United States. Due to complex topography, physiographic heterogeneity, and complicated relationships with large bodies of water, spatial autocorrelation of environmental similarity may be...
Hilaria jamesii data for the Colorado Plateau of the southwestern United States Hilaria jamesii data for the Colorado Plateau of the southwestern United States
These data were compiled to investigate the demographic, phylogeographic, and adaptation history of Hilaria jamesii. The data release consists of three tab delimited text files that may be used to infer population structure or putative adaptive loci (hija_adaptation_dataset.stru), relationships among sampling localities (hija_phylogeny_dataset.phylip), or genetic diversity statistics...
Filter Total Items: 28
Bridging theory and practice to inform seed selection for restoration Bridging theory and practice to inform seed selection for restoration
Introduction Land managers often face the critical decision of what plant materials to select for ecological restoration. Selection depends on factors that span ecological conditions and human interventions in the restoration process, which can strongly influence the recovery of a degraded ecosystem. Objectives To improve the seed selection process, we compared scientific literature and...
Authors
Laura Cecilia Shriver, Samuel E. Jordan, Robert Massatti, Seth Munson
Suturing fragmented landscapes: Mosaic hybrid zones in plants may facilitate ecosystem resiliency Suturing fragmented landscapes: Mosaic hybrid zones in plants may facilitate ecosystem resiliency
Many widespread plant taxa of western North America have diversified into phenotypically and genetically divergent lineages due to complex biogeographic histories across heterogeneous landscapes. Mosaic hybrid zones can form when geographically co-occurring, yet environmentally distinct, lineages cross-pollinate and form hybrids that occupy unique environmental niches absent of a...
Authors
Robert Massatti, Trevor Morgan Faske, Ivana M. Barnes, Elizabeth A. Leger, Thomas L. Parchman, Bryce A. Richardson, L. Lacey Knowles
Genetic structure of an expanding population of Humpback Chub in Grand Canyon Genetic structure of an expanding population of Humpback Chub in Grand Canyon
Objective Humpback Chub (HBC) Gila cypha in Grand Canyon declined in abundance and distribution over the latter part of the 20th century but have substantially increased in abundance and distribution over the past two decades. Although previous genetic work suggested that HBC in Grand Canyon belong to one genetic group, here we evaluate the genetic structure of HBC in Grand Canyon to...
Authors
Maria C. Dzul, Robert Massatti, Charles Yackulic, Emily Omana-Smith, Kirk Young
The cost of self-defense: Browsing effects in the rare plant species Salix arizonica The cost of self-defense: Browsing effects in the rare plant species Salix arizonica
Coevolution between plants and their animal predators has led to diverse defensive adaptations. Multiple theories of defense propose that there are resource allocation costs associated with producing chemical defenses. One leading hypothesis, optimal defense theory (ODT), suggests that natural selection will result in the allocation of resources to defenses that optimize the cost-to...
Authors
Shannon J. Lencioni, Robert Massatti, Ken Keefover-Ring, Liza M. Holeski
Intraspecific trait variability in wild populations predicts neither variability nor performance in a common garden Intraspecific trait variability in wild populations predicts neither variability nor performance in a common garden
Dryland restoration requires plant materials capable of performing well despite difficult growing conditions. Selecting plant materials with higher intraspecific trait variability (ITV) may support successful outcomes by enhancing the performance of those materials in restoration settings. However, maintaining ITV from wild populations is not well understood and requires further...
Authors
Ella M. Samuel, Rachel M. Mitchell, Daniel E. Winkler, Zoe M. Davidson, Shannon Joy Lencioni, Robert Massatti
Matching existing and future native plant materials to disturbance-driven restoration needs Matching existing and future native plant materials to disturbance-driven restoration needs
Assessing the appropriateness of existing native plant materials can both determine which seed source to utilize for restoration projects, and identify locations for which new seed sources need to be developed. Here, we demonstrate an approach to meet these needs. This method identifies areas of high restoration need based on disturbance patterns, assesses the regional suitability of...
Authors
Daniel E. Winkler, Sarah Sterner, John B. Bradford, Adrienne M. Pilmanis, Robert Massatti
Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2022 Report) Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2022 Report)
A primary focus of the Colorado Plateau Native Plant Program (CPNPP) is to identify and develop appropriate native plant materials (NPMs) for current and future restoration projects. Multiple efforts have characterized the myriad challenges inherent in providing appropriate seed resources to enable effective, widespread restoration and have identified a broad suite of research activities...
Authors
Robert Massatti, Daniel E. Winkler, Sasha C. Reed, Michael C. Duniway, Seth M. Munson, John B. Bradford
Evolutionary dynamics inform management interventions of a hanging garden obligate, Carex specuicola Evolutionary dynamics inform management interventions of a hanging garden obligate, Carex specuicola
Uncovering the historical and contemporary processes shaping rare species with complex distributions is of growing importance due to threats such as habitat destruction and climate change. Species restricted to specialized, patchy habitat may persist by virtue of life history characteristics facilitating ongoing gene flow and dispersal, but they could also reflect the remnants of...
Authors
Kenneth James Chapin, Matthew R Jones, Daniel E. Winkler, Glenn Rink, Robert Massatti
Assessing population genomic structure and polyploidy: A crucial step for native plant restoration Assessing population genomic structure and polyploidy: A crucial step for native plant restoration
Establishing an effective restoration program requires baseline genetic information to make sound decisions for seed increase and transfer. For many plants this information is lacking, especially among native forbs that are critical for pollinator health. Erigeron speciosus is a widespread, perennial forb occupying montane environments in the western United States and Canada. This...
Authors
Bryce A. Richardson, Robert Massatti, Nurul Islam-Faridi, Skylar Johnson, Francis F. Kilkenny
Spatially explicit management of genetic diversity using ancestry probability surfaces Spatially explicit management of genetic diversity using ancestry probability surfaces
1. Ecological restoration and conservation efforts are increasing worldwide and the management of intraspecific genetic variation in plants and animals, an important component of biodiversity, is increasingly valued. As a result, tailorable, spatially explicit approaches to map genetic variation are needed to support decision-making and management frameworks related to the recovery of...
Authors
Robert Massatti, Daniel E. Winkler
Hybrid enrichment of adaptive variation revealed by genotype-environment associations in montane sedges Hybrid enrichment of adaptive variation revealed by genotype-environment associations in montane sedges
The role of hybridization in diversification is complex and may result in many possible outcomes. Not only can hybridization produce new lineages, but those lineages may contain unique combinations of adaptive genetic variation derived from parental taxa that allow hybrid-origin lineages to occupy unique environmental space relative to one (or both) parents. We document such a case of
Authors
Richard G.J. Hodel, Robert Massatti, L Lacey Knowles
Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2021 Report) Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2021 Report)
A primary focus of the Colorado Plateau Native Plant Program (CPNPP) is to identify and develop appropriate native plant materials (NPMs) for current and future restoration projects. Multiple efforts have characterized the myriad challenges inherent in providing appropriate seed resources to enable effective, widespread restoration and have identified a broad suite of research activities...
Authors
Robert Massatti, Daniel E. Winkler, Sasha C. Reed, Michael C. Duniway, Seth M. Munson, John B. Bradford
Non-USGS Publications**
Massatti, R., Doherty, K.D. and Wood, T.E. (2018), Resolving neutral and deterministic contributions to genomic structure in Syntrichia ruralis (Bryophyta, Pottiaceae) informs propagule sourcing for dryland restoration. Conservation Genetics, 19: 85.
Knowles, L. L. and Massatti, R. (2017), Distributional shifts – not geographic isolation – as a probable driver of montane species divergence. Ecography, 40: 1475-1485.
Massatti, R. and Knowles, L. L. (2016), Contrasting support for alternative models of genomic variation based on microhabitat preference: species‐specific effects of climate change in alpine sedges. Molecular Ecology, 25: 3974-3986.
Knowles, L. L., Massatti, R. , He, Q. , Olson, L. E. and Lanier, H. C. (2016), Quantifying the similarity between genes and geography across Alaska's alpine small mammals. Journal of Biogeography, 43: 1464-1476.
Massatti, R. , Reznicek, A. A. and Knowles, L. L. (2016), Utilizing RADseq data for phylogenetic analysis of challenging taxonomic groups: A case study in Carex sect. Racemosae. American Journal of Botany, 103: 337-347.
Lanier, H. C., Massatti, R. , He, Q. , Olson, L. E. and Knowles, L. L. (2015), Colonization from divergent ancestors: glaciation signatures on contemporary patterns of genomic variation in Collared Pikas (Ochotona collaris). Molecular Ecology, 24: 3688-3705.
Massatti, R. and Knowles, L. L. (2014), Microhabitat differences impact phylogeographic concordance of codistributed species: genomic evidence in montane sedges (Carex L.) from the Rocky Mountains. Evolution, 68: 2833-2846.
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POPMAPS: An R package to estimate ancestry probability surfaces POPMAPS: An R package to estimate ancestry probability surfaces
This software code was developed to estimate the probability that individuals found at a geographic location will belong to the same genetic cluster as individuals at the nearest empirical sampling location for which ancestry is known. POPMAPS includes 5 main functions to calculate and visualize these results (see Table 1 for functions and arguments). Population assignment coefficients...