491 Works

PffBT4T

Varuni Dantanarayana
Conformational and energetic disorder in organic semiconductors reduces charge and exciton transport because of the structural defects, thus reducing the efficiency in devices such as organic photovoltaics and organic light-emitting diodes. The main structural heterogeneity is because of the twisting of the polymer backbone that occurs even in polymers that are mostly crystalline. Here, we explore the relationship between polymer backbone twisting and exciton delocalization by means of transient absorption spectroscopy and density functional theory...

Groove Loops: A Collection of Repeating Multi-Instrumental Patterns

Petr Janata
This dataset contains 456 musical stimuli used in the series of studies reported in: Janata, P., Peterson, J., Ngan, C., Keum, B., Whiteside, H., & Ran, S. (2018). Psychological and Musical Factors Underlying Engagement with Unfamiliar Music. Music Perception, 36(2), 175-200. doi:10.1525/mp.2018.36.2.175

Steroid concentrations in boar tissues

Trish Berger, Heidi Kucera, Alan Conley & Birgit Puschner
Synthesis and metabolism of steroids is highly interconnected within a tissue. The initial objective of these studies was to evaluate the influence of estrogens on the synthesis and metabolism of other steroids in the testis and other tissues. The aromatase inhibitor, letrozole, was used to inhibit testicular estrogen synthesis. Littermates from five different litters (potentially six boars from one litter) provided the testis, prostate, and liver tissues but only four boars (one from each of...

A Strawberry Database: Geometric Properties, Images and 3D Scans

Adrien Durand-Petiteville, Dennis Sadowski & Stavros Vougioukas
1611 strawberries from different places and varieties are used to collect images, 3D scans as well as physical properties such as shape, width, height, and weight.

Images of individual strawberries (entire fruit, flesh and calyx) with contrasting background

Adrien Durand-Petiteville, Stavros Vougioukas, David Slaughter & Dennis Sadowski
This database contains images of 258 individual strawberries with dark background (a setting typically encountered during post-harvest operations). For each strawberry, six images are provided: 1) a color image of the entire strawberry; 2) a color image containing only the calyx of the strawberry; 3) a color image containing only the flesh of the strawberry; 4) a binary image of the entire strawberry; 5) a binary image of the calyx, and 6) a binary image...

Influence of Relative Humidity on the Heterogeneous Oxidation of Secondary Organic Aerosol

Christopher Cappa, Ziyue Li & Katherine Smith
This dataset contains data from figures and model code used to generate figures in the paper "Influence of Relative Humidity on the Heterogeneous Oxidation of Secondary Organic Aerosol" by Li et al., published in Atmospheric Chemistry and Physics. A description of the work follows below. See read me files for details. Secondary organic aerosol (SOA) is a complex mixture of hundreds of semi‑volatile to extremely low‑volatility organic compounds that are chemically processed in the atmosphere,...

Stress in paradise: effects of elevated corticosterone on immunity and avian malaria resilience in a Hawaiian passerine

Gabrielle Names, Elizabeth Schultz, Jesse Krause, Thomas Hahn, John Wingfield, Molly Heal, Jamie Cornelius, Kirk Klasing & Kathleen Hunt
Vertebrates confronted with challenging environments often experience an increase in circulating glucocorticoids, which result in morphological, physiological, and behavioral changes that promote survival. However, chronically elevated glucocorticoids can suppress immunity, which may increase susceptibility to disease. Since the introduction of avian malaria to Hawaii a century ago, low elevation populations of Hawaii Amakihi (Chlorodrepanis virens) have undergone strong selection by avian malaria and evolved increased resilience (the ability to recover from infection), while populations at...

Data and analysis scripts for: Co-occurrence patterns at four spatial scales implicate reproductive processes in shaping community assembly in clovers

Kyle Christie, Susan Harrison, Maren L. Friesen & Sharon Y. Strauss
1. Competition, niche differences, and chance all contribute to community assembly, yet the role of reproductive interactions between species is often less appreciated. Closely related plant species that share floral form, phenology, and habitat often interact through pollination. They potentially facilitate pollinator attraction, compete for pollination services, and/or exchange pollen. If reproductive processes are important to co-occurrence, we predicted that fitness costs of heterospecific pollen transfer or pollen limitation should result in lower rates of...

Predicted asymmetrical effects of warming on nocturnal and diurnal soil-dwelling ectotherms

Marshall McMunn & Adam Pepi
Climate is expected to have broad effects on ecological communities, but this occurs in the context of significant daily temperature variation in many localities. Because many ectotherms can restrict activity to thermally suitable places and times, daily temperature variation offers the potential to buffer impacts of warming. Using thermal activity data from a montane ground-nesting ant community, we explore how a simulated increase in temperature is expected to alter the duration of suitable activity windows....

Variation in immunity and health in response to introduced avian malaria in an endemic Hawaiian songbird

Gabrielle Names, Elizabeth Schultz, Thomas Hahn, Kathleen Hunt, Frederic Angelier, Cécile Ribout & Kirk Klasing
Emerging infectious diseases are spreading at unprecedented rates and affecting wildlife worldwide, with particularly strong effects on islands. Since the introduction of avian malaria to Hawaii a century ago, the disease has contributed to the decline and extinction of several endemic Hawaiian honeycreeper species. At low elevation, where avian malaria is prevalent, Hawaii Amakihi (Chlorodrepanis virens) honeycreeper populations have experienced strong selection by the disease and have evolved increased malaria resilience, the ability to recover...

Numerical responses of omnivorous terrestrial arthropods to plant alternative resources suppress prey populations: a meta-analysis

Shelby Rinehart & Jeremy Long
Omnivory is ubiquitous in ecological communities. Yet, we lack a consensus of how plant alternative resources impact the ability of omnivores to suppress prey populations. Previous work suggests that plant alternative resources can increase, decrease, or have no effect on the magnitude of omnivore-prey interactions. This discrepancy may arise from 1) the ability of omnivores to numerically respond to plant alternative resources and 2) identity-specific effects of plant alternative resources. We used a meta-analysis to...

Modeling dynamic processes in the California ZEV market (2014-2016)

Debapriya Chakraborty, David Bunch & David Brownstone
The market for plug-in electric vehicles (PEVs) that primarily include battery electric vehicles (BEVs) and plug-in hybrid vehicles (PHEVs) has been rapidly growing in California for the past few years. Given the targets for PEV penetration in the state, it is important to have a better understanding of the pattern of technology diffusion and the factors that are driving the process. Using spatial analysis and Poisson count models we identify the importance of a neighborhood...

Data from: Wolbachia in the spittlebug Prosapia ignipectus: variable infection frequencies, but no apparent effect on host reproductive isolation

Timothy Wheeler, Vinton Thompson, William Conner & Brandon Cooper
Animals serve as hosts for complex communities of microorganisms, including endosymbionts that live inside their cells. Wolbachia bacteria are perhaps the most common endosymbionts, manipulating host reproduction to propagate. Many Wolbachia cause cytoplasmic incompatibility (CI), which results in reduced egg hatch when uninfected females mate with infected males. Wolbachia that cause intense CI spread to high and relatively stable frequencies, while strains that cause weak or no CI tend to persist at intermediate, often variable,...

Acorn woodpecker (Melanerpes formicivorus) behavior varies in response to intra- and interspecific calls

Josephine Collier, Skye Hoolihan, Ethan Jakob & Hannah St. John
Acorn woodpeckers are a community-oriented species that, like other birds, uses and responds to vocalizations as a form of communication. The calls of certain competitors, predators, and intraspecific individuals change the behavior of a listener in different ways. The behaviors of three acorn woodpecker colonies were observed in response to four recordings: Steller’s jay, sharp-shinned hawk, an acorn woodpecker distress call, and a control. An ethogram was recorded for pre-call and post-call behavior of each...

Mendocino meadow memory: legacy effects of land use on plant communities of Angelo Coast Range Reserve

Ary Sanchez-Amaya, Frida Perez, Jena Weinberger & Susan Glasser
Human alteration of landscapes has occurred consistently through actions such as development, tilling, agriculture, and fire management. Human land use can result in a legacy of exotic species dominance and increased competition, with negative impacts on native species richness and soil structure. Meadows within California have been affected by settlement due to their accessibility to humans and soil conditions that are ideal for agriculture. Prior to European settlement, meadows in Angelo Coast Range Reserve (ACRR)...

Abiotic differences and anthropogenic interference affect foothill yellow-legged frog breeding

Sharon Tamir, Anna Szymanska, Amanda Callahan, Gina Lucas & Jeniffer Amezquita
As human presence rapidly introduces novel environmental pressures to native ecosystems, many species experience population declines. Sensitive taxa such as amphibians may be particularly vulnerable to such environmental disturbances. Rana boylii, the foothill yellow-legged frog and a California State Species of Special Concern, serves as a model for understanding the effect of anthropogenic interference, such as changing climate and disturbed habitats, on reproductive success. In this study, we measured egg mass abundance, abiotic characteristics of...

Sisters or strangers: How does relatedness affect foraging in carpenter ants?

Lauren Hwang-Finkelman, Marissa Lopez, Alondra Murguia & Nathalie Treminio
Optimal foraging theory (OFT) states that animals will forage in a way that maximizes energy intake while minimizing energy expenditure. Eusocial insects are examples of species that exhibit OFT. One type of eusocial insect is the carpenter ant (Camponotus). Carpenter ants use pheromone trails as a form of communication. In using chemical cues to communicate with one another, carpenter ants fulfill OFT by maximizing energy rewards and minimizing energy spent searching for resources. We conducted...

The adaptive value of leaf quaking in Populus tremuloides

Natalie Kim, Mark Makar, Alexander Osleger & Juliana Shenouda
Some Populus species have evolved a flattened petiole that causes their leaves to quake in mild wind. In this study, we performed one observational study and two experimental studies on quaking aspen (Populus tremuloides) to investigate three predominant hypotheses on the adaptive value of quaking: (1) herbivory reduction, (2) light permeation, and (3) temperature maintenance. Overall, we found less insect herbivory on branches that quake less. We also found that quaking allows more light into...

Impacts of anthropogenic disturbance and insect abundance on Sonoran Desert bat activity

Amy Sue Law, , Emma McAndrews & Jess Stumpf
Rapid urbanization has been beneficial and detrimental to desert ecosystems. One group of organisms that are sensitive to such anthropogenic disturbance are bats. In this study, we examined bat abundance and composition in the Sonoran Desert in Southern California to assess how the bat community is affected by human disturbance and insect abundance. We observed bat calls and surveyed insect abundance at sites with high and low levels of human impact. We found that there...

Human-wildlife interactions in Anza-Borrego Desert State Park

Ninfa Negrete, Sara Ramirez & Robert Wong
Transportation infrastructure, such as roads and highways, supports human activity but negatively affect wildlife habitat, populations, and entire ecosystems (Bennet et. al 2011). As road networks continue to expand, animals lose habitat and are confined to isolated fragments, with the possibility of being enclosed by roads. Road effects like habitat fragmentation is not well known in state parks. This study aims to examine some of the effects of road disturbance on wildlife in the Anza-Borrego...

A cross species analysis of various stressors among three pine species in the San Jacinto Mountains suggest Pinus jeffreyi is the most susceptible to environmental changes

Mona Broukhim, Benjamin Early & Luis Orozco Sanchez
Pine species in the southern fringes of their range are experiencing changes related to climatic pressures which may in turn affect their susceptibility to bark beetle invasions. These environmental stressors can lead to changes in a pines ability to produce resin as a defensive measure. This study of Pinus jeffreyi, Pinus coulteri, and Pinus lambertiana aims to identify the species of most concern and the overall health of the pines in the San Jacinto Mountains....

Host tree circumference, litter depth, and slope affect snow plant (Sarcodes sanguinea) size at James San Jacinto Mountain Reserve

Sean Hinson & Mina Sadek
Plant-ectomycorrhizal relationships dominate temperate forest ecosystems, and for many Pinaceae tree species, this mutualistic relationship is an essential aspect of their ability to gather nutrients. The snow plant (Sarcodes sanguinea) is an ectomycorrhizal parasite that steals nutrients from host trees by accessing their root systems via the mycorrhizae. We examine microhabitat variables that affect snow plant size and phenology by measuring 5 snow plants within the James San Jacinto Mountain Reserve. We investigate the effects...

Predaceous diving beetles, Ilybius walsinghami, prefer organic debris for shelter in the San Jacinto Mountains, Indian Creek

Marley O’Connor, Emily Mun, Cole Dawdy & Isa Rosario-Martinez
Due to climatic changes, stream habitats are projected to be exposed to more frequent and intense floods. Floods can dramatically alter the stream ecosystem by lowering aquatic invertebrate abundance and richness, changing stream substrate composition, and impacting microhabitat availability. Depending on the substrate preferences of individual species, aquatic invertebrate populations could be impacted not only directly by floods, but also in their ability to re-populate highly altered stream habitats. In this study, we focused on...

Investigating unburned understory “halos” post-fire under blue oak (Quercus douglasii) canopies

Skyler Bennis, Sam Cormier, Angela Ma & Madeline Perreault
Oak trees profoundly impact California’s oak landscape biodiversity. Oaks influence growth in their understories and these community interactions have important ecological implications. Oaks can facilitate (positive) or interfere (negative) with understory productivity depending on tree characteristics such as variation in root morphology. Historically, California oak communities have been negatively affected by fire suppression, but they are now being impacted by increasing wildfire frequency. Despite their dominance in the woodland and savanna landscapes, there is a...

Exploring insect specialization on A. tridentata and A. rothrockii

Naomi Charlet, Elise Cypher, Anu Sethuraman & Tamar Viz
Invertebrates have been shown to specialize to different host environments, both with and without geographic isolation. Some plants emit volatile organic compounds (VOCs) to deter invertebrate herbivory. Specialist invertebrates have been shown to adapt to host plants regardless of VOC deterrents. Sagebrush (Artemisia spp.) is a plant which exhibits this damage-induced resistance. In the White Mountains, Artemisia tridentata and Artemisia rothrockii occupy the same general areas and are closely related yet differ in their chemistry...

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