160 Works

Black-tailed deer and what they fear: vigilance responses to predator vocalizations as a window into current and historical predation pressure

Bryce Ahn, Marisol Morales, Ian Perrett, Mika Post, Francis Ulep & Yunqing Sara Ye
Predation is a potent ecological and evolutionary force, shaping the behavior of animals to minimize risk. Behavior itself can therefore provide clues into the predation pressure experienced by a population. We investigated anti-predator vigilance behavior in a California coastal population of black-tailed deer in response to vocal cues from three predator species of varying current and historical risk: grey wolf, coyote, and red-tail hawk. Vigilance was measured as the proportion of a herd alerting to...

Dietary preference of Formica obscuripes depends on role not time

Sarahi Arellano, Francisca C. Fazzio, Cal J. Huesby & Zaira B. Sepulveda Ochoa
Resource management is necessary for the success of a species. Optimal foraging theory states that a species will attempt to minimize the energy spent obtaining resources, whilst maximizing the resources collected. Optimal foraging theory can be examined through the lens of ant colony behavior. Formica obscuripes utilizes role specialization and resource partitioning in each colony to minimize its energy use while maximizing its nutrient reserve. However, nutrient preferences within roles have been largely unstudied. In...

Alpine wet meadows: soil properties’ effect on plant diversity

Madeline Castro, Fidel Machado-Perez & Rebecca Raven
Alpine ecosystems are a harsh environment with little nutrients and the abiotic effect that the soil has on the plant community is relatively unknown. The focus of this study is to illuminate the role that soils play in the plant diversity of alpine wet meadows. In doing so we investigated the function of clay and root content, organic matter, pH and soil moisture in determining plant diversity in three meadows in the White Mountains, California....

Pod indehiscence is a domestication and aridity resilience trait in common bean

Travis Parker, Jorge Carlos Berny Mier Y Teran, Antonia Palkovic, Judy Jernstedt & Paul Gepts
Abstract Plant domestication has strongly modified crop morphology and development. Nevertheless, many crops continue to display some atavistic characteristics that were advantageous to their wild ancestors, such as pod dehiscence (PD). Here, we provide the first comprehensive assessment of the inheritance of PD in a domesticated grain legume, common bean (Phaseolus vulgaris). We compared three methods to evaluate the PD phenotype and identified multiple, unlinked genetic regions controlling PD using a biparental population and two...

Sociodemographic data for battery electric vehicle owning households in California (From NCST Project "Understanding the Early Adopters of Fuel Cell Vehicles")

Scott Hardman
Sociodemographic data for fuel cell and battery electric vehicle owning households in California

Herbivory defense and growth tradeoffs along a moisture gradient in Lupinus latifolius var. columbianus

Lilly Boiton, James Powers & Jordan Waits
Hypotheses such as the plant stress hypothesis, apparency theory, and the resource availability hypothesis provide contrasting predictions to how plants respond to abiotic stress and their interactions with herbivores. In this paper we examined the effects of a water availability gradient on the morphological characteristics and herbivory of Lupinus latifolius var. columbianus. We measured the abundance of the leaf beetle, Galeruca rudis, and Aphididae as well as the amount of leaf herbivory damage on lupine...

Cutting-edge meadows: The effect of meadow edges and orientation on plant community dynamics

Julie Adriana Barrios, Mary De Aquino, Joseph Francis Di Liberto & Daniel Melnick
Ecological communities are thought to be homogenous throughout their discrete habitats however “edge effects” and the factors that influence them have been known to change species richness and composition on these border regions. In this study, we analyzed the effect of a possible driver of this variation-orientation-on species richness and composition while moving away from habitat edges. To do so, we measured richness and composition along transects in each of the four cardinal directions in...

Going with the flow? Larval caddisfly case-building behavior in response to river flow type

Maya Pastreich, Hefan Zhang, Andrea Gonzalez & Sean Jarrell-Hurtado
Aquatic invertebrates in rivers experience a high level of variability throughout their lifespan and serve as important foundations for watershed food webs in addition to being bioindicators. One such invertebrate, the Limnephilidae caddisfly, expresses a unique behavior in which the larvae construct body cases as a means of protection from predators and the surrounding environment. We investigate whether larval caddisfly possess a behavioral plasticity regarding changes in river flow when building their cases. We surveyed...

Effects of disturbance on biological soil crusts

Alexandra Reep, Christian Morgan & Lilianne De La Espriella
Drylands are prone to desertification as human disturbances degrade desert ecosystems and limit their capacity to bio-produce. Biological soil crusts, a specialized community of lichen and cyanobacteria, are particularly vulnerable to these disturbances. To gauge the effects of anthropogenic disturbance on soil particle size and soil crust growth, Collema, a widely-distributed genus of soil lichen, was used as an indicator of overall ecosystem health. We used the visual percent cover method in four “low disturbance”...

Hastings Natural History Reservation

Information Manager UCNRS
MISSION STATEMENT: The UC Natural Reserve System is a network of protected natural areas throughout California. Its 39 sites include more than 756,000 acres, making it the largest university-administered reserve system in the world. Most major state ecosystems are represented, from coastal tidepools to inland deserts, and lush wetlands to Sierra Nevada forests. The reserves also serve as a gateway to more than a million acres of public lands. Founded in 1965 to provide undisturbed...

Motte Rimrock Reserve

Information Manager UCNRS
MISSION STATEMENT: The UC Natural Reserve System is a network of protected natural areas throughout California. Its 39 sites include more than 756,000 acres, making it the largest university-administered reserve system in the world. Most major state ecosystems are represented, from coastal tidepools to inland deserts, and lush wetlands to Sierra Nevada forests. The reserves also serve as a gateway to more than a million acres of public lands. Founded in 1965 to provide undisturbed...

Data for analysis of snowmelt timing as a determinant of inflow mixing in Lake Tahoe

Derek Roberts, Shohei Watanabe & S. Geoffrey Schladow
This dataset includes data files pertinent to the manuscript, "Snowmelting timing as a determinant of inflow mixing," accepted for publication in Water Resources Research in January 2018. Included data were used for an analysis of relative stream-lake conditions as they pertain to winter climate conditions and the subsequent mixing of snowmelt inflows into the lake. Included with each of the six files listed below is a [FILENAME]_Reference.txt file with details on data collection, curation, and...

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

Heterotrophic N2-fixation contributes to nitrogen economy of a common wetland sedge, Schoenoplectus californicus

Eliska Rejmankova, Dagmara Sirova, Stephanie Castle, Jiri Barta & Heather Carpenter
These data sets document environmental characteristics of sampling locations of Schoenoplectus californicus, california bulrush, throughout its range in the Americas. In addition, the data on nif gene in rhizomes and roots of Schoenoplectus are provided.

University of California Natural Reserve System

Information Manager UCNRS
MISSION STATEMENT: The UC Natural Reserve System is a network of protected natural areas throughout California. Its 39 sites include more than 756,000 acres, making it the largest university-administered reserve system in the world. Most major state ecosystems are represented, from coastal tidepools to inland deserts, and lush wetlands to Sierra Nevada forests. The reserves also serve as a gateway to more than a million acres of public lands. Founded in 1965 to provide undisturbed...

Defensive displays and chemical secretions of darkling beetles in the Mojave Desert

Tania Aguilar, Didra Felix, Meghan Proctor & Athena Schlereth
Many organisms often rely on chemical defenses to deter predators. However, the way in which invertebrates utilize chemical defenses has been relatively understudied. Darkling beetle species of the Eleodes and Coelocnemis genera exhibit defensive posturing followed by malodorous chemical secretions to signal their unpalatability towards potential predators. However, the metabolic costs and trade-offs associated with these mechanisms are unknown. It is also unclear whether certain beetle species utilize chemical defenses more readily than others. We...

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)...

Effect of Drought Stress on the Genetic Architecture of Photosynthate Allocation and Remobilization in Pods of Common Bean (Phaseolus vulgaris L.), a Key Species for Food Security

Paul Gepts, Jorge Carlos Berny Mier Y Teran, Enéas R. Konzen, Antonia Palkovic, Siu M. Tsai, Idupulapati M. Rao & Stephen Beebe
Background: Common bean is the most important staple grain legume for direct human consumption and nutrition. It complements major sources of carbohydrates, including cereals, root crop, or plantain, as a source of dietary proteins. It is also a significant source of vitamins and minerals like iron and zinc. To fully play its nutritional role, however, its robustness against stresses needs to be strengthened. Foremost among these is drought, which commonly affects its productivity and seed...

Jenny Pygmy Forest Reserve

Information Manager UCNRS
MISSION STATEMENT: The UC Natural Reserve System is a network of protected natural areas throughout California. Its 39 sites include more than 756,000 acres, making it the largest university-administered reserve system in the world. Most major state ecosystems are represented, from coastal tidepools to inland deserts, and lush wetlands to Sierra Nevada forests. The reserves also serve as a gateway to more than a million acres of public lands. Founded in 1965 to provide undisturbed...

Elliott Chaparral Reserve

Information Manager UCNRS
MISSION STATEMENT: The UC Natural Reserve System is a network of protected natural areas throughout California. Its 39 sites include more than 756,000 acres, making it the largest university-administered reserve system in the world. Most major state ecosystems are represented, from coastal tidepools to inland deserts, and lush wetlands to Sierra Nevada forests. The reserves also serve as a gateway to more than a million acres of public lands. Founded in 1965 to provide undisturbed...

Ecological role of cattle at Point Reyes National Seashore: effects of grazing history on coastal plant communities

Martin Arceo, Riley Content-Castro, Jacques Jougla & Laurel Teague
There is ongoing debate over the effectiveness of cattle grazing as a prospect for plant community conservation. Since the National Park Service acquired the land at Point Reyes Seashore, controversies over whether ranching should continue in the protected area have defined part of the park's public image. Resolving uncertainties over impacts of cattle on the Point Reyes landscape could inform these debates and lead to viable long-term management strategies. In this study, we examine grassland...

Water uptake, cloud condensation nuclei and surface tension: results from the MadFACTS campaign

Sara Forestieri, Sean Staudt, Thomas Kuborn, Christopher Ruehl, Timothy Bertram & Christopher Cappa
This data set is associated with the manuscript “Establishing the Impact of Model Surfactants on Cloud Condensation Nuclei Activity of Sea Spray Aerosols” by Forestieri et al. that has been submitted to Atmospheric Chemistry and Physics. The abstract to this manuscript is provided below. By reducing surface tension (σ), surfactants present in aerosols can increase their cloud condensation nuclei (CCN) activation efficiency. However, the importance of this effect is poorly constrained. Here we present estimates...

Initial application of the noise-sorted scanning clustering algorithm to the analysis of composition-dependent organic aerosol thermal desorption measurements

Christopher Cappa, Ziyue Li, Emma D'Ambro, Siegfried Schobesberger, John Shilling, Felipe Lopez-Hilfiker, Jiumeng Liu, Cassandra Gaston & Joel Thornton
The FIGAERO-CIMS (Filter Inlet for Gases and AEROsols + chemical ionization mass spectrometer) measures thermal desorption profiles for individual ions evolved from evaporation of organic aerosol components. Often, hundreds of individual thermograms are obtained, reflecting the compositional complexity of organic aerosol. We have developed a novel clustering algorithm, Noise-Sorted Scanning Clustering (NSSC), that provides a robust, reproducible analysis of the FIGAERO temperature-dependent mass spectral data. The NSSC allows for determination of thermal profiles for compositionally...

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