A5000774294- Ecology and Vegetation Dynamics Studies
- Plant and animal studies
- Genetic diversity and population structure
- Mycorrhizal Fungi and Plant Interactions
- Forest Insect Ecology and Management
- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Forest Ecology and Biodiversity Studies
- Tree-ring climate responses
- Species Distribution and Climate Change
- Plant Pathogens and Fungal Diseases
- Plant Parasitism and Resistance
- Botanical Research and Applications
- Botany, Ecology, and Taxonomy Studies
- Plant Reproductive Biology
- Bioenergy crop production and management
- Evolution and Genetic Dynamics
- Fire effects on ecosystems
- Remote Sensing and LiDAR Applications
- Forest Management and Policy
- Yeasts and Rust Fungi Studies
- Botany and Plant Ecology Studies
- Plant responses to elevated CO2
- Molecular Biology Techniques and Applications
- Identification and Quantification in Food
San Diego State University
2017-2023
Northern Arizona University
2010-2020
Oregon State University
2020
Western Sydney University
2016-2017
Universidad Nacional Autónoma de México
2011-2013
Instituto de Ecología
2010-2013
Plant genetic variation and soil microorganisms are individually known to influence plant responses climate change, but the interactive effects of these two factors largely unknown. Using long-term observational studies in field common garden greenhouse experiments a foundation tree species (Pinus edulis) its mutualistic ectomycorrhizal fungal (EMF) associates, we show that EMF community composition is under strong control. Seedlings acquire their seed source trees (drought tolerant vs....
Although the importance of plant-associated microbes is increasingly recognized, little known about biotic and abiotic factors that determine composition microbiome. We examined influence plant genetic variation, two stressors, one abiotic, on ectomycorrhizal (EM) fungal community a dominant tree species, Pinus edulis. During three periods across 16 years varied in drought severity, we sampled EM communities wild stand P. edulis which genetically based resistance susceptibility to insect...
Abstract Interactions between extrinsic factors, such as disruptive selection and intrinsic genetic incompatibilities among loci, often contribute to the maintenance of species boundaries. The relative roles these factors in establishment reproductive isolation can be examined using pairs characterized by gene flow throughout their divergence history. We investigated process speciation boundaries Pinus strobiformis flexilis . Utilizing ecological niche modelling, demographic modelling...
Abstract Arbuscular mycorrhizal ( AM ) fungi are widespread root symbionts that often improve the fitness of their plant hosts. We tested whether local adaptation in symbioses would shape community structure these a way maximizes symbiotic functioning. grew native prairie grass A ndropogon gerardii) with all possible combinations soils and fungal inocula from three different prairies varied soil characteristics disturbance history (two remnants one recently restored). identified colonizing ....
Summary The interactions among climate change, plant genetic variation and fungal mutualists are poorly understood, but probably important to survival under drought. We examined these by studying the ectomycorrhizal ( EMF ) communities of pinyon pine seedlings Pinus edulis planted in a wildland ecosystem experiencing two decades change‐related established common garden containing P. known maternal lineages (drought tolerant, DT ; drought intolerant, DI ), manipulated soil moisture measured...
Abstract Extant conifer species may be susceptible to rapid environmental change owing their long generation times, but could also resilient due high levels of standing genetic diversity. Hybridisation between closely related can increase diversity and generate novel allelic combinations capable fuelling adaptive evolution. Our study unravelled the architecture evolution in a hybrid zone formed Pinus strobiformis P. flexilis . Using multifaceted approach emphasising spatial patterns linkage...
Summary Multispecies interbreeding networks, or syngameons, have been increasingly reported in natural systems. However, the formation, structure, and maintenance of syngameons received little attention. Through gene flow, can increase genetic diversity, facilitate colonization new environments, contribute to hybrid speciation. In this study, we evaluated history, patterns, consequences hybridization a pinyon pine syngameon using morphological genomic data assess demographic geographic...
A lack of optimal gene combinations, as well low levels genetic diversity, is often associated with the formation species range margins. Conservation efforts rely on predictive modelling using abiotic variables and assessments diversity to determine target populations for controlled breeding, germplasm conservation assisted migration. Biotic factors such interspecific competition hybridization, however, are largely ignored, despite their prevalence across diverse taxa role key evolutionary...
• Premise of the study: Even though dioecy is a dominant sexual system among gymnosperms, little known about its evolutionary history. Pinus johannis may represent model because unisexual and monoecious individuals compose populations. The presence in other species consequence lability. Here we determined whether P. represents first example dioecious or nearly reproductive conifers by evaluating stability. Methods: To assess stability expression, quantified proportion male vs. female...
High temperatures associated with climate change are expected to be detrimental for aspects of plant reproduction, such as pollen viability. We hypothesized that 1) higher peak predicted would have a minimal effect on viability at dispersal and larger negative affects germination, 2) high during facilitate acclimation 3) from populations sites warmer average better adapted temperature peaks. tested these hypotheses in Pinus edulis, species demonstrated sensitivity change, using along an...
The sexual separation in dioecious species has interested biologists for decades; however, the cellular mechanism leading to unisexuality been poorly understood. In this study, changes that lead male sterility functionally cactus, Opuntia stenopetala, are described. spatial and temporal patterns of programmed cell death (PCD) were determined anthers female flowers using scanning electron microscopy analysis histological observations, focusing attention on transition from bisexual unisexual...
Abstract Background Forest dieback driven by rapid climate warming threatens ecosystems worldwide. The health of forested depends on how tree species respond to during all life history stages. While it is known that seed development temperature-sensitive, little about possible effects and subsequent seedling performance. Exposure seeds high air temperatures may influence performance negatively, though conversely, aid acclimation seedlings thermal stress. Technical challenges associated with...
The phenotype of trees is determined by the relationships and interactions among genetic environmental influences. Understanding patterns processes that are responsible for phenotypic variation facilitated studying between environment many individuals across broad ecological climatic gradients. We used Pinus strobiformis, which has a wide latitudinal distribution, as model species to: (a) estimate relative importance different factors in predicting these morphological traits (b) characterize...
Species of the genus Geopora are important ectomycorrhizal associates that can dominate communities some plant taxa, such as pinyon pine (Pinus edulis), a widespread tree western United States. Several members known only from root tips and thus have not been described formally. The sporocarps species occur infrequently because they depend on wet years for sporulation. In addition, be small may hypogeous at developmental stage, limiting opportunities describing their morphology. Using...
Invasive, non-native plant species can alter soil microbial communities in ways that contribute to their persistence. While most studies emphasize mycorrhizal fungi, invasive plants also may influence of dark septate fungi (DSF), which are common root endophytes function like mycorrhizas. We tested the hypothesis a widespread western United States, cheatgrass (Bromus tectorum L.), influenced abundance and community composition DSF by examining roots rhizosphere soils two native...
• Premise of study: Bisexuality (male and female function in one structure) has been reported as a key innovation angiosperms. Although there are several reports "teratological" bisporangiate (bisexual) cones gymnosperms, have none on the viability their ovules pollen. Analyses development arrangement male structures Pinus johannis enables us to gain insight origin bisexuality seed plants, for both angiosperms gymnosperms. Methods: Viability was assayed by performing manual crosses using...
The California Phenology Thematic Collections Network (CAP TCN) is a collaborative project that seeks to maximize the value of herbarium specimens and their data, especially for understanding changes in plant phenology due anthropogenic climate change. unites personnel herbaria at universities, research stations, natural history museums, botanic gardens with goal capturing images, transcribing label producing georeferenced coordinates nearly one million preserved collected over past 150+...
Abstract Background and Aims Pinyon pine hybridization is widely acknowledged, but the frequency of contributors to such interspecific mating remain largely unstudied. Pinus quadrifolia has three four needles per fascicle, suggesting that it a result between five-needled P. juarezensis single-needled monophylla. In this study we address taxonomic validity juarezensis, hybrid origin presence intermediate morphology as in complex. Methods We these questions by combining genomic morphological...
In certain unisexual flowers, non-functional sexual organs remain vestigial and unisexuality can be overlooked leading to the ambiguous description of systems. Therefore, accurately describe system, detailed morphological developmental analyses along with experimental crosses must performed. Cylindropuntia wolfii is a rare cactus endemic Sonoran Desert in southern California northern Baja that was described as gynodioecious by analysis. The aims our project include identifying system C....
Worldwide, trees are confronting increased temperature and aridity, exacerbating susceptibility to herbivory. Long-term studies comparing patterns of plant performance through drought can help identify variation among within populations in vulnerability climate change We use long-term monitoring data examine our overarching hypothesis that the negative impacts poor soil herbivore would be compounded by severe drought. studied pinyon pine, Pinus edulis, a widespread southwestern tree species...