A5019384423- Species Distribution and Climate Change
- Plant and animal studies
- Cryospheric studies and observations
- Ecology and Vegetation Dynamics Studies
- Tree-ring climate responses
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Fire effects on ecosystems
- Forest ecology and management
- Wildlife-Road Interactions and Conservation
- Rangeland and Wildlife Management
- Remote Sensing and LiDAR Applications
- Wildlife Ecology and Conservation
- Soil Geostatistics and Mapping
- Genetic diversity and population structure
- Plant responses to elevated CO2
- Meteorological Phenomena and Simulations
- Hydrology and Watershed Management Studies
- Lichen and fungal ecology
- Animal and Plant Science Education
- Climate change and permafrost
- Land Use and Ecosystem Services
- Soil Moisture and Remote Sensing
- Botany, Ecology, and Taxonomy Studies
- Data Quality and Management
Rocky Mountain Biological Laboratory
2020-2025
Western Colorado University
2024-2025
University of Arizona
2021
Harvard University
2018-2020
Harvard University Press
2020
University of Washington
2014-2017
University of North Carolina at Chapel Hill
2010
Phenology is a key biological trait that can determine an organism's survival and provides one of the clearest indicators effects recent climatic change. Long time-series observations plant phenology collected at continental scales could clarify latitudinal regional patterns responses illuminate drivers variation, but few such datasets exist. Here, we use web tool CrowdCurio to crowdsource phenological data from over 7000 herbarium specimens representing 30 diverse flowering species...
Understanding how climate affects tree growth is essential for assessing change impacts on forests but can be confounded by effects of competition, which strongly influences responses to climate. We characterized the joint size, and diameter using hierarchical Bayesian methods applied permanent sample plot data from montane Mount Rainier National Park, Washington State, USA, are mostly comprised Abies amabilis Douglas ex Forbes, Tsuga heterophylla (Raf.) Sarg., Pseudotsuga menziesii (Mirb.)...
Spatial community reassembly driven by changes in species abundances or habitat occupancy is a well-documented response to anthropogenic global change, but communities can also reassemble temporally if the environment drives differential shifts timing of life events across members. Much like spatial reassembly, temporal could be particularly important when critical interactions are concentrated (e.g., plant-pollinator dynamics during flowering). Previous studies have documented...
Abstract Conserving or restoring landscape connectivity between patches of breeding habitat is a common strategy to protect threatened species from fragmentation. By managing for some species, usually charismatic vertebrates, it often assumed that these will serve as conservation umbrellas other species. We tested this assumption by developing quantitative method measure overlap in dispersal 3 species—a bird (the umbrella), butterfly, and frog—inhabiting the same fragmented landscape....
Climate change increasingly drives local population dynamics, shifts geographic distributions, and threatens persistence. Gene flow rapid adaptation could rescue declining populations yet are seldom integrated into forecasts. We modeled eco-evolutionary dynamics under preindustrial, contemporary, projected climates using up to 9 years of fitness data from 102,272 transplants (115 source populations) Boechera stricta in five common gardens. endangers locally adapted reduces genotypic...
Abstract In recent years, the availability of airborne imaging spectroscopy (hyperspectral) data has expanded dramatically. The high spatial and spectral resolution these uniquely enable spatially explicit ecological studies including species mapping, assessment drought mortality foliar trait distributions. However, we have barely begun to unlock potential use direct mapping vegetation characteristics infer subsurface properties critical zone. To assess their utility for Earth systems...
Phenology-the timing of life-history events-is a key trait for understanding responses organisms to climate. The digitization and online mobilization herbarium specimens is rapidly advancing our plant phenological response climate climatic change. current practice manually harvesting data from individual specimens, however, greatly restricts ability scale-up collection. Recent investigations have demonstrated that machine-learning approaches can facilitate this effort. However, present...
Abstract Reliable maps of snow‐covered areas at scales meters to tens meters, with daily temporal resolution, are essential understanding snow heterogeneity, melt runoff, energy exchange, and ecological processes. Here we develop a parsimonious downscaling routine that can be applied fractional covered area (fSCA) products from satellite platforms such as the Moderate Resolution Imaging Spectroradiometer (MODIS) provide ∼500 m data, derive higher‐resolution presence/absence grids. The method...
Abstract. A declining spring snowpack is expected to have widespread effects on montane and subalpine forests in western North America across the globe. The way that tree water demands respond this change will important impacts forest health downstream subsidies. Here, we present data from a network of sap velocity sensors xylem isotope measurements three common species (Picea engelmannii, Abies lasiocarpa Populus tremuloides) hillslope transect watershed Upper Colorado River basin. We use...
In the information age, it has become increasingly common for data containing records about overlapping individuals to be distributed across multiple sources, making necessary identify which refer same individual. The goal of record linkage is estimate this unknown structure in absence a unique identifiable attribute. We introduce Bayesian hierarchical model spatial location motivated by estimation individual specific growth-size curves conifer species using derived from LiDAR scans. Annual...
Moving hybrid zones provide compelling examples of evolution in action, yet long-term studies that test the assumptions zone stability are rare. Using replicated transect samples collected over a 10-year interval from 2002 to 2012, we find evidence for concerted movement genetic clines plateau fence lizard (Sceloporus tristichus) Arizona. Cline-fitting analyses SNP and mtDNA data both shifted northward by approximately 2 km during interval. For each sampling period, cline centre is displaced...
Interactions between species can influence successful reproduction, resulting in reproductive character displacement, where the similarity of traits - such as flowering time among close relatives growing together differ from when apart. Evidence for overall prevalence and direction this phenomenon, its stability under environmental change, remains untested across large scales. Using power crowdsourcing, we gathered phenological information over 40 000 herbarium specimens, investigated...
In this study, we develop a machine-learning (ML)-enabled strategy for selecting hillslope-scale ecohydrological monitoring sites within snow-dominated mountainous watersheds, with particular focus on snow-soil–plant interactions. Data layers rely spatial data from both remote sensing and hydrological model simulations. Specifically, Landsat-based foresummer drought sensitivity index is used to define the dependency of annual peak plant productivity Palmer severity in early growing season....
Predicting how climate change will influence forests is challenging. Forest communities are expected to lose cold-adapted trees near their low latitude/elevation range limits, while warm-adapted should increase in abundance high limits ( i.e., 'thermophilization'). However, slow-growing and long-lived trees, paired with climatic sensitivities that differ by species could add complexity these predictions. To address possibilities, we use demographic data collected from Mount Rainier National...
Mapping geographic mosaics of genetic variation and their consequences via genotype x environment interactions at large extents high resolution has been limited by the scalability DNA sequencing. Here, we address this challenge for cytotype (chromosome copy number) in quaking aspen, a drought-impacted foundation tree species. We integrate airborne imaging spectroscopy data with ground-based sequencing canopy damage 391 km2 southwestern Colorado. show that (1) aspen cover can be remotely...
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Remotely sensed data acquired by multispectral sensors can be used to monitor soil moisture (SM) across a larger land area than in situ monitoring alone. Although there have been wide-ranging applications of remote sensing tools SM estimation on many ecosystems, is limited understanding their accuracy restored wetlands. The objective this study was examine the potential remotely from Landsat-9, Sentinel-1A SAR, and Blackswift E2 Uncrewed Aircraft Systems (UAS) predicting wetland complex...
Abstract Plant reproductive phenology—the timing of reproduction—is shifting rapidly with global climate change. Many studies focus on flowering responses to climate, but few investigate how postflowering processes, such as quickly plants develop from seed dispersal, respond environmental factors. We examined the climatic drivers phenology in 28 species western North American subalpine meadow over large spatial and temporal gradients. took a Bayesian hierarchical approach address whether...
Abstract Protected lands like national parks are important refuges for threatened and endangered species as environmental pressures on wildlife their habitats increase. The Northern Spotted Owl (Strix occidentalis caurina), a designated under the Endangered Species Act, occurs public throughout western United States including Mount Rainier National Park (MRNP), Washington. With virtually no history of timber harvest or large forest disturbance within MRNP boundaries since park’s creation in...