65 Works

Computational exploration of treadmilling and protrusion growth observed in fire ant rafts

Robert Wagner
Condensed active matter systems regularly achieve cooperative emergent functions that individual constituents could not accomplish alone. The rafts of fire ants (Solenopsis invicta) are often studied in this context for their ability to create structures comprised entirely of their own bodies, including tether-like protrusions that facilitate exploration of flooded environments. While similar protrusions are observed in cytoskeletons and cellular aggregates, they are generally dependent on morphogens or external gradients leaving the isolated role of local...

Climate warming threatens the persistence of a community of disturbance-adapted native annual plants

Paul Reed, Scott Bridgham, Laurel Pfeifer-Meister, Megan Peterson, Bart Johnson, Bitty Roy, Graham Bailes, Aaron Nelson, William Morris & Daniel Doak
With ongoing climate change, populations are expected to exhibit shifts in demographic performance that will alter where a species can persist. This presents unique challenges for managing plant populations and may require ongoing interventions, including in-situ management or introduction into new locations. However, few studies have examined how climate change may affect plant demographic performance for a suite of species, or how effective management actions could be in mitigating climate change effects. Over the course...

Data from: Leaf litter arthropod responses to tropical forest restoration

Rebecca J. Cole, Karen D. Holl, Rakan A. Zahawi, Philipp Wickey & Alan R. Townsend
Soil and litter arthropods represent a large proportion of tropical biodiversity and perform important ecosystem functions, but little is known about the efficacy of different tropical forest restoration strategies in facilitating their recovery in degraded habitats. We sampled arthropods in four 7‐ to 8‐year‐old restoration treatments and in nearby reference forests. Sampling was conducted during the wet and dry seasons using extractions from litter and pitfall samples. Restoration treatments were replicated in 50 × 50‐m...

Data from: Modeling GPS signal propagation through volcanic plumes

Nicholas Rainville, Scott Palo & Kristine Larson
Extinction of Global Positioning System (GPS) signals has been observed at GPS sites located near erupting volcanoes as a decrease in the Signal to Noise Ratio (SNR) of recieved signals. While this effect has been used to detect volcanic ash plumes, the physical processes causing the signal extinction were not well understood. A simulation was developed to model absorption and scattering from ash particles in a plume which included plume density, composition, and charging as...

A supergene underlies linked variation in color and morphology in a Holarctic songbird

Erik Funk, Nicholas Mason, Snæbjörn Pálsson, Tomáš Albrecht, Jeff Johnson & Scott Taylor
The genetic architecture of a phenotype can have considerable effects on the evolution of a trait or species. Characterizing genetic architecture provides insight into the complexity of a given phenotype and, potentially, the role of the phenotype in evolutionary processes like speciation. We use genome sequences to investigate the genetic basis of phenotypic variation in redpoll finches (Acanthis spp.). We demonstrate that variation in redpoll phenotype is broadly controlled by a ~55-Mb chromosomal inversion. Within...

The effects of climate and demographic history in shaping genomic variation across populations of the Desert Horned Lizard (Phrynosoma platyrhinos)

Keaka Farleigh, Sarah A. Vladimirova, Christopher Blair, Jason T. Bracken, Nazila Koochekian, Drew R. Schield, Daren C. Card, Nicholas Finger, Jonathan Henault, Adam D. Leaché, Todd A. Castoe & Tereza Jezkova
Species often experience spatial environmental heterogeneity across their range, and populations may exhibit signatures of adaptation to local environmental characteristics. Other population genetic processes, such as migration and genetic drift, can impede the effects of local adaptation. Genetic drift in particular can have a pronounced effect on population genetic structure during large-scale geographic expansions, where a series of founder effects leads to decreases in genetic variation in the direction of the expansion. Here we explore...

Data from: Effects of Bark Beetle Outbreaks on Forest Landscape Pattern in the Southern Rocky Mountains, U.S.A.

Kyle Rodman, Robert Andrus, Cori Butkiewicz, Teresa Chapman, Nathan Gill, Brian Harvey, Dominik Kulakowski, Niko Tutland, Thomas Veblen & Sarah Hart
Since the late 1990s, extensive outbreaks of native bark beetles (Curculionidae: Scolytinae) have affected coniferous forests throughout Europe and North America, driving changes in carbon storage, wildlife habitat, nutrient cycling, and water resource provisioning. Remote sensing is a crucial tool for quantifying the effects of these disturbances across broad landscapes. In particular, Landsat time series (LTS) are increasingly used to characterize outbreak dynamics, including the presence and severity of bark beetle-caused tree mortality, though broad-scale...

Underrepresented youth experience barriers prior to field experiences

Susan Bonfield, Dalia Dorta & Jorge Vargas-Barriga
Environment for the Americas has developed a model internship program that helps to recruit diverse youth for internship positions on federal lands and with non-governmental organizations. To improve the program, we have conducted almost a decade of surveys to examine the barriers diverse youth may face when applying for these positions and working at sites where staff, visitors, and other interns may be predominantly White. Our model has been very successful in addressing barriers, including...

PSP FIELDS Digital Fields Board (DFB) AC-coupled Differential Voltage, V3-V4 Antennae, Dipole Mode, Bandpass filtered, High Gain, Sensor coordinates, Level 2 (L2), 0.873813 s Data

Stuart D. Bale, David M. Malaspina, Alexandros Chasapis, Marc Pulupa, Timothy Quinn & Peter Schroeder
PSP FIELDS Digital Fields Board, DFB, dV34 data. The DFB is the low frequency, less than 75 kHz, component of the FIELDS experiment on the Parker Solar Probe spacecraft. DFB AC bandpass data consist of peak and average values of the absolute value of bandpassed time series waveform data over a time interval equal to the reporting cadence. The AC bandpass data have the peak response frequency of each bin reported in the metadata. The...

Modulation of a protein-folding landscape revealed by AFM-based force spectroscopy notwithstanding instrumental limitations

Devin Edwards, Marc-Andre Leblanc & Thomas Perkins
Single-molecule force spectroscopy is a powerful tool for studying protein folding. Over the last decade, a key question has emerged: how are changes in intrinsic biomolecular dynamics altered by attachment to micron-scale force probes via flexible linkers? Here, we studied the folding/unfolding of α3D using AFM-based force spectroscopy. α3D offers an unusual opportunity as a prior smFRET study showed α3D’s molecular diffusion constant within the context of Kramers theory varies with pH. The resulting pH-dependence...

The cost of travel: how dispersal ability limits local adaptation in host-parasite interactions

Pieter Johnson, Dana Calhoun, Wynne Moss, Travis McDevitt-Galles, Tawni Riepe, Joshua Hallas, Thomas Parchman, Chris Feldman, Josh Cropanzano, Jay Bowerman, Tyler Achatz, Vasyl Tkach & Janet Koprivnikar
Classical theory suggests that parasites will exhibit higher fitness in sympatric relative to allopatric host populations (local adaptation). However, evidence for local adaptation in natural host-parasite systems is often equivocal, emphasizing the need for cross-infection experiments conducted over realistic geographic scales and comparisons among species with varied life history traits. Here, we conducted cross-infection experiments to test how two trematode (flatworm) species (Paralechriorchis syntomentera and Ribeiroia ondatrae) with differing dispersal abilities varied in the strength...

Analysis Data for \"Identifying and characterizing pesticide use on 9,000 fields of organic agriculture\"

Ashley Larsen, Sofie McComb, Claire Powers & Sofie McComb
We identify the location of ~9,000 organic fields from 2013 — 2019 using field-level crop and pesticide use data, along with state certification data, for Kern County, CA, one of the US’ most valuable crop producing counties. We parse apart how being organic relative to conventional affects decisions to spray pesticides and, if spraying, how much to spray. We show the expected probability of spraying any pesticides is reduced by about 30 percentage points for...

Sequences and tree used in: Growth form is strongest predictor of algal photobiont community diversity in lichens: Dissertation chapter

Kyle Keepers
Lichens are a symbiotic assemblage containing primarily a fungal species in association with at least one photosynthetic partner. Lichens exist in a variety of growth forms and may reproduce sexually or asexually. We investigated how these variables contribute to the community diversity within the thalli of 405 lichens across a broad taxonomic range. We found that reproductive mode is not a predictor for community diversity of lichens using only algal photobionts, but that growth form...

Genomic evidence that governmentally produced Cannabis sativa poorly represents genetic variation available in state markets

Daniela Vergara
The National Institute on Drug Abuse (NIDA) is the sole producer of Cannabis for research purposes in the United States, including medical investigation. Previous research established that cannabinoid profiles in the NIDA varieties lacked diversity and potency relative to the Cannabis produced commercially. Additionally, microsatellite marker analyses have established that the NIDA varieties are genetically divergent form varieties produced in the private legal market. Here, we analyzed the genome of multiple Cannabis varieties from diverse...

Spatial and temporal variation in phenotypes and fitness in response to developmental thermal environments

Jenna Pruett & Daniel Warner
1) Phenotypic variation within populations is influenced by the environment via plasticity and natural selection. How phenotypes respond to the environment can vary among traits, populations, and life stages in ways that can influence fitness. 2) Plastic responses during early development are particularly important because they can affect components of fitness throughout an individual’s life. Consequently, how natural selection shapes developmental plasticity could be influenced by fitness consequences across different life stages. Moreover, spatial variation...

Four approaches leading to the age scale of the Young Island ice core

Dorothea Moser & Elizabeth Thomas
Young Island is a new ice core drilling site uniquely positioned to give insight into the (sub-)Antarctic climate. This dataset contains four preliminary dating approaches that lay the foundation for the age scale of the Young Island ice core presented in Moser et al. (2021). Funding was provided to SubICE by Ecole Polytechnique Federale de Lausanne, the Swiss Polar Institute, and Ferring Pharmaceuticals Inc (grant no. SubICE). ERT received core funding from NERC to the...

Data Set for \"Impact of Hydrogen Sulfide on Photochemical Haze Formation in Methane/Nitrogen Atmospheres\"

Nathan W Reed, Browne, Eleanor Carol & Margaret A Tolbert
Data set for the published article "Impact of Hydrogen Sulfide on Photochemical Haze Formation in Methane/Nitrogen Atmospheres" by Nathan W Reed, Eleanor C Browne, and Margaret A Tolbert. Published in ACS Earth and Space Chemistry. Data for aerosol mass spectra, particle mobility diameter, and vacuum aerodynamic diameter discussed and presented in the publication.

Data for \"Disturbance and valley confinement: controls on floodplain LW and organic matter jam deposition in the Colorado Front Range, USA\"

Molly Guiney
Organic matter dynamics (entrainment, transport, deposition) can influence ecogeomorphic complexity in rivers. However, the depositional controls on downed, large wood (LW) and coarse particulate organic matter (CPOM) on floodplains have rarely been assessed. We investigate the influence of different disturbance histories, as well as geomorphology and forest stand density, on the deposition of LW and CPOM accumulations, or jams, between two adjacent drainages (West Creek, North Fork Big Thompson) in the Colorado Front Range. Both...

Data for \"Perceptions of green space usage, abundance, and quality of green space were associated with better mental health during the COVID-19 pandemic among residents of Denver\"

Emma Rieves & Colleen Elizabeth Reid
Background: The COVID-19 pandemic has impacted both physical and mental health. This study aimed to understand whether exposure to green space buffered against stress and distress during the COVID-19 pandemic while taking into account significant stressors of the pandemic. Methods: We leveraged a cross-sectional survey on green space exposure and mental health among residents of Denver, CO that ran from November 2019 through January 2021. We measured objective green space as the average NDVI (normalized...

Type III secretion system effector proteins are mechanically labile

Marc-Andre LeBlanc, Morgan Fink, Thomas Perkins & Marcelo Sousa
Multiple Gram-negative bacteria encode Type III secretion systems (T3SS) that allow them to inject effector proteins directly into host cells to facilitate colonization. To be secreted, effector proteins must be at least partially unfolded to pass through the narrow needle-like channel (diameter < 2 nm) of the T3SS. Fusion of effector proteins to tightly packed proteins—such as GFP, ubiquitin, or dihydrofolate reductase (DHFR)—impairs secretion and results in obstruction of the T3SS. Prior observation that unfolding...

Imaging the breakdown of ohmic transport in graphene

Alec Jenkins, Susanne Baumann, Haoxin Zhou, Simon Meynell, Daipeng Yang, Kenji Watanabe, Takashi Taniguchi, Andrew Lucas, Andrea Young & Ania Bleszynski Jayich
Ohm's law describes the proportionality of current density and electric field. In solid-state conductors, Ohm's law emerges due to electron scattering processes that relax the electrical current. Here, we use nitrogen-vacancy center magnetometry to directly image the local breakdown of Ohm's law in a narrow constriction fabricated in a high mobility graphene monolayer. Ohmic flow is visible at room temperature as current concentration on the constriction edges, with flow profiles entirely determined by sample geometry....

TSIS-1 SIM Recalibration of the SORCE-SIM Absolute Irradiance Scale

James Mothersbaugh, Jerald Harder, Steven Penton & Stèphane Bèland
This TSIS-Adjusted Value (TAV) SORCE-SIM irradiance calibration provides a TSIS1-SIM/SORCE-SIM ratio on the SORCE-SIM wavelength scale. This scale varies in spectral resolution from 1-34 nm over the spectral range. Irradiances are reported at a mean solar distance of 1 AU and zero relative line-of-sight velocity with respect to the Sun. The SORCE TSIS-1 Irradiance Calibration Ratio (STICR) is tabulated is the attached datasets, containingn the wavelength, number of spectra combined at this wavelength, SORCE mean...

PSP FIELDS Digital Fields Board (DFB) AC-coupled Differential Voltage, V1-V2 Antennae, Dipole Mode, Bandpass filtered, High Gain, Sensor coordinates, Level 2 (L2), 0.873813 s Data

Stuart D. Bale, David M. Malaspina, Alexandros Chasapis, Marc Pulupa, Timothy Quinn & Peter Schroeder
PSP FIELDS Digital Fields Board, DFB, dV12 data: The DFB is the low frequency, less than 75 kHz, component of the FIELDS experiment on the Parker Solar Probe spacecraft. DFB AC bandpass data consist of peak and average values of the absolute value of bandpassed time series waveform data over a time interval equal to the reporting cadence. The AC bandpass data have the peak response frequency of each bin reported in the metadata. The...

PSP FIELDS Digital Fields Board (DFB) AC-coupled Searchcoil Magnetometer, SCM, Bandpass filtered, Medium Frequency, High Gain, u-component, Sensor coordinates, Level 2 (L2), 0.873813 s Data

Stuart D. Bale, Thierry Dudok de Wit, David M. Malaspina, Alexandros Chasapis, Marc Pulupa, Timothy Quinn & Peter Schroeder
PSP FIELDS Digital Fields Board, DFB, SCMumfhg data. The DFB is the low frequency, less than 75 kHz, component of the FIELDS experiment on the Parker Solar Probe spacecraft. DFB AC bandpass data consist of peak and average values of the absolute value of bandpassed time series waveform data over a time interval equal to the reporting cadence. The AC bandpass data have the peak response frequency of each bin reported in the metadata. The...

Taylor Valley Stream Hydrology TLS B-421 PS23 SV01

Dianne McKnight, Michael Gooseff, Keith Williams & Marianne Okal

Registration Year

  • 2021
    65

Resource Types

  • Dataset
    65

Affiliations

  • University of Colorado Boulder
    63
  • University of California, Berkeley
    4
  • University of California, Santa Barbara
    3
  • Vrije Universiteit Amsterdam
    2
  • University of Washington
    2
  • Amsterdam UMC Location VUmc
    2
  • University of Queensland
    2
  • University of Orléans
    2
  • University of Minnesota
    2
  • Erasmus MC
    2