92 Works

Implications of genetic heterogeneity for plant translocation during ecological restoration

Taylor Crow
Ecological restoration often requires translocating plant material from distant sites. Importing suitable plant material is important for successful establishment and persistence. Yet published guidelines for seed transfer are available for very few species. Accurately predicting how transferred plants will perform requires multi-year and multi-environment field trials and comprehensive follow-up work, and is therefore infeasible given the number of species used in restoration programs. Alternative methods to predict the outcomes of seed transfer are valuable for...

Transportation Network Company (TNC) taxes/fees by state/city in the United States

Sam Fuller & Austin Brown
Cities and states across the U.S. are assessing fees or taxes on transportation network company (TNC) platforms, such as Uber and Lyft. The goals of these policies include traffic and emissions mitigation, as well as revenue generation, among other objectives. Our research aims to assess the goals and effectiveness of these fees in achieving some of these policy objectives, primarily congestion and emissions mitigation. The analysis addresses a core difficulty in comparing TNC fees—some fees...

Predator group composition indirectly influences food web dynamics through predator growth rates

Kate Laskowski, Marta Alirangues Nunez, Sabine Hilt, Mark Gessner & Thomas Mehner
Considerable theoretical work predicts that intraspecific trait variation can have profound ecological consequences by altering species interactions. Because of their high flexibility, behavioral traits may be especially relevant in mediating how species respond to one another, thus affecting food web dynamics and ecosystem functioning. However, empirical evidence supporting this idea is limited. Here we generated predator groups where we manipulated the composition of behavioral types within the groups to assess effects on predator growth rates,...

Data from: Addressing incomplete lineage sorting and paralogy in the inference of uncertain salmonid phylogenetic relationships

Matthew Campbell, Thaddaeus Buser, Michael Alfaro & J. Andres Lopez
Recent and continued progress in the scale and sophistication of phylogenetic research has yielded substantial advances in knowledge of the tree of life; however, segments of that tree remain unresolved and continue to produce contradicting or unstable results. These poorly resolved relationships may be the product of methodological shortcomings or of an evolutionary history that did not generate the signal traits needed for its eventual reconstruction. Relationships within the euteleost fish family Salmonidae have proven...

Interpreting morphological adaptations associated with viviparity in the Tsetse fly (Glossina morsitans) by three-dimensional analysis

Geoffrey Attardo
Tsetse flies (genus Glossina), the sole vectors of African trypanosomiasis, are distinct from other disease vectors, and most other insects, due to dramatic evolutionary adaptations required to support their unique life history. These morphological and physiological adaptations are driven by demands associated with their strict dietary and reproductive requirements. Tsetse reproduce by obligate viviparity which entails obligate intrauterine larval development and provisioning of nutrients for the developing larvae. Viviparous reproduction reduces reproductive capacity/rate which also...

Early maternal separation is not associated with changes in telomere length in domestic kittens (Felis catus)

Mikel Delgado, C.A.T. Tony Buffington, Melissa Bain & Karen Vernau
Objective The objective of this study was to determine if premature separation from the mother affected telomere length in domestic kittens (Felis catus) at one and eight weeks of life. Subjects were 42 orphaned kittens and 10 mother-reared kittens from local animal rescue groups and shelters. Blood (200 µl) was collected from kittens at 1 and 8 weeks of age via jugular venipuncture. Telomere length was assessed by qPCR (quantitative polymerase chain reaction) from 86...

Effects of low-carbon energy adoption on airborne particulate matter concentrations with feedbacks to future climate over California

Anikender Kumar, Christina Zapata, Sonia Yeh, Chris Yang, Joan Ogden, Hsiang-He Lee, ShuHua Chen & Michael Kleeman
California plans to reduce emissions of long-lived greenhouse gases (GHGs) through adoption of new energy systems that will also lower concentrations of short-lived absorbing soot contained in airborne particulate matter (PM). Here we examine the direct and indirect effects of reduced PM concentrationsunder a low-carbon energy (GHG-Step) scenario on radiative forcing in California. Simulations were carried out using the source-oriented WRF/Chem (SOWC) model over California with 12 km spatial resolutionfor the year 2054. The avoided...

Evolution of the Greater Caucasus basement and formation of the Main Caucasus Thrust, Georgia

Dylan Vasey, Eric Cowgill, Sarah Roeske, Nathan Niemi, Tea Godoladze, Irakli Skhirtladze & Salome Gogoladze
Along the northern margin of the Arabia-Eurasia collision zone in the western Greater Caucasus, the Main Caucasus Thrust (MCT) juxtaposes Paleozoic crystalline basement to the north against Mesozoic metasedimentary and volcaniclastic rocks to the south. The MCT is commonly assumed to be the trace of an active plate-boundary scale structure that accommodates Arabia-Eurasia convergence, but field data supporting this interpretation are equivocal. Here we investigate the deformation history of the rocks juxtaposed across the MCT...

Insect diversity over 36 years at a protected Sierra Nevada (California) site

Jay Rosenheim & Philip Ward
Recent authors have suggested that declines of insect abundance or diversity, documented first for particular insect taxa of high interest (e.g., butterflies, bees), may apply to insect diversity more generally. This has led to an urgent call for analysis of additional longitudinal datasets to examine trends in general insect diversity. Here we present a dataset gathered from 1982-2018 by advanced undergraduate students and graduate students enrolled in a taxonomy course that involved collecting as many...

Data from: Zooming in on mechanistic predator-prey ecology: integrating camera traps with experimental methods to reveal the drivers of ecological interactions

Justine Smith, Justin Suraci, Jennifer Hunter, Kaitlyn Gaynor, Carson Keller, Meredith Palmer, Justine Atkins, Irene Castañeda, Michael Cherry, Patrick Garvey, Sarah Huebner, Dana Morin, Lisa Teckentrup, Martijn Weterings & Lydia Beaudrot
1. Camera trap technology has galvanized the study of predator-prey ecology in wild animal communities by expanding the scale and diversity of predator-prey interactions that can be analyzed. While observational data from systematic camera arrays have informed inferences on the spatiotemporal outcomes of predator-prey interactions, the capacity for observational studies to identify mechanistic drivers of species interactions is limited. 2. Experimental study designs that utilize camera traps uniquely allow for testing hypothesized mechanisms that drive...

Channel types predictions for the South Fork Eel River basin

Hervé Guillon, Colin F. Byrne, Belize A. Lane, Samuel Sandoval Solis & Gregory B. Pasternack
Hydrologic and geomorphic classifications have gained traction in response to the increasing need for basin-wide water resources management. Regardless of the selected classification scheme, an open scientific challenge is how to extend information from limited field sites to classify tens of thousands to millions of channel reaches across a basin. To address this spatial scaling challenge, we leveraged machine learning to predict reach-scale geomorphic channel types using publicly available geospatial data.

Analytical Modeling Framework to Assess the Economic and Environmental Impacts of Residential Deliveries, and Evaluate Sustainable City Logistics Strategies

Anmol Pahwa & Miguel Jaller
In the last decade, e‐commerce has grown substantially, increasing business‐to‐business, business‐to‐consumer, and consumer‐to‐consumer transactions. As a result, there has been a continuous growth in last mile operations, especially deliveries to residential areas, bringing along externalities such as congestion, air and noise pollution, and energy consumption. This project aims to develop an analytical framework to model last mile operations based on continuous approximation techniques. The model will help estimate the economic and environmental impacts of residential...

Equate SENAS and IVD cognitive measure: Summary of methods and results

Dan Mungas, Ji Won Han, Pauline Maillard, Danielle Harvey, Evan Fletcher, Oliver Martinez, David Johnson, John Olichney, Sarah Farias, Sylvia Villeneuve, William Jagust & Charles DeCarli
Conceptually similar measures of episodic memory and executive function have been derived from different tests that compose the SENAS (Spanish and English Neuropsychological Assessment Scale) and IVD-PPG (ischemic vascular contributions to cognitive decline and dementia) neuropsychological test batteries. The purpose of this project was to create equated episodic memory and executive scores from these two batteries that are on the same measurement metric and can be combined in analyses using data from both projects. This...

Landscape simplification increases vineyard pest outbreaks and insecticide use

Daniel Paredes, Jay Rosenheim, Rebecca Chaplin-Kramer, Silvia Winter & Daniel Karp
Diversifying agricultural landscapes may mitigate biodiversity declines and improve pest management. Yet landscapes are rarely managed to suppress pests, in part because researchers seldom measure key variables related to pest outbreaks and insecticides that drive management decisions. We used a 13-year government database to analyze landscape effects on European grapevine moth (Lobesia botrana) outbreaks and insecticides across ~400 Spanish vineyards. At harvest, we found pest outbreaks increased four-fold in simplified, vineyard-dominated landscapes compared to complex...

Unraveling the complex hybrid ancestry and domestication history of cultivated strawberry

Michael Hardigan, Anne Lorant, Dominique Pincot, Mitchell Feldmann, Randi Famula, Charlotte Acharya, Seonghee Lee, Sujeet Verma, Vance Whitaker, Nahla Bassil, Jason Zurn, Glenn Cole, Kevin Bird, Patrick Edger & Steven Knapp
Cultivated strawberry (Fragaria × ananassa) is one of our youngest domesticates, originating in early eighteenth-century Europe from spontaneous hybrids between wild allo-octoploid species (F. chiloensis and F. virginiana). The improvement of horticultural traits by 300 years of breeding has enabled the global expansion of strawberry production. Here, we describe the genomic history of strawberry domestication from the earliest hybrids to modern cultivars. We observed a significant increase in heterozygosity among interspecific hybrids and a decrease...

Wildfire alters the disturbance impacts of an emerging infectious disease via changes to host occurrence and demographic structure

Allison Simler-Williamson, Margaret Metz, Kerri Frangioso & David Rizzo
1. Anthropogenic activities have altered historical disturbance regimes, and understanding the mechanisms by which these shifting perturbations interact is essential to predicting where they may erode ecosystem resilience. Emerging infectious plant diseases, caused by human translocation of nonnative pathogens, can generate ecologically-damaging forms of novel biotic disturbance. Further, abiotic disturbances, such as wildfire, may influence the severity and extent of disease-related perturbations via their effects on the occurrence of hosts, pathogens, and microclimates; however, these...

Data from: Body shape diversification along the benthic-pelagic axis in marine fishes

Sarah Friedman, Samantha Price, Katherine Corn, Olivier Larouche, Christopher Martinez & Peter Wainwright
Colonization of novel habitats can result in marked phenotypic responses to the new environment that include changes in body shape and opportunities for further morphological diversification. Fishes have repeatedly transitioned along the benthic-pelagic axis, with varying degrees of association with the substrate. Previous work focusing on individual lineages shows that these transitions are accompanied by highly predictable changes in body form. Here, we generalize expectations drawn from this literature to study the effects of habitat...

NCST Caltrans project on sensor data error estimation

Yueyue Fan & Saurabh Maheshwari
The aim of this script is to automate the process of directed network graph formation, i.e., creation of incidence matrix, node adjacency matrix, and map the sensors to appropriate links. The data used for creating the freeway network is obtained from open street maps, whereas, the data for sensors is obtained from PeMS. The results of the algorithm will later be fed to the network sensor error estimation algorithm, that quantifies the erroneous sensors using...

Utilizing Highway Rest Areas for Electric Vehicle Charging: Economics and Impacts of Renewable Energy Penetration in California

Behdad Kiani, Joan Ogden, F. Alex Sheldon & Lauren Cordano
California policy is incentivizing rapid adoption of zero emission electric vehicles for light duty and freight applications. In this project, we explored how locating charging facilities at California’s highway rest stops, might impact electricity demand, grid operation, and integration of renewables like solar and wind into California’s energy mix. Assuming a growing population of electric vehicles to meet state goals, we estimated state-wide growth of electricity demand, and identified the most attractive rest stop locations...

VCC User Survey Results

Angela Sanguinetti
PROJECT: Strategies to promote plug-in electric vehicle (PEV) adoption include consumer education about potential energy cost savings. However, the complexity of comparing gasoline and electricity prices makes it difficult to quantify. Vehicle energy cost calculators (VCCs) help consumers navigate this complexity, and research shows they can increase consumer knowledge and positive attitudes about PEVs. At least 12 of these calculators exist, but none appear to be based on behavioral research. They vary in terms of...

Data from: Behavioral changes in calves 11 days after cautery disbudding: effect of local anesthesia

Cassandra Tucker, Sarah Adcock & Danielle Cruz
Hot-iron disbudding results in painful burn wounds that take weeks to heal. Spontaneous behaviors indicative of pain are apparent in the immediate hours after disbudding, but whether they occur later in the healing process is unknown. To evaluate whether ongoing pain was present around the time the necrotic tissue loosens from the scalp, we tested the effect of administration of local anesthetic 11 d after the procedure. Disbudded female Holstein and Jersey calves (n=24) were...

Data from: Wildfire reveals transient changes to individual traits and population responses of a native bumble bee (Bombus vosnesenskii)

John Mola, Michael Miller, Sean O'Rourke & Neal Williams
1. Fire-induced changes in the abundance and distribution of organisms, especially plants, can alter resource landscapes for mobile consumers driving bottom-up effects on their population sizes, morphologies, and reproductive potential. We expect these impacts to be most striking for obligate visitors of plants, like bees and other pollinators, but these impacts can be difficult to interpret due to the limited information provided by forager counts in the absence of survival or fitness proxies. 2. Increased...

Towards the introgression of PvPdh1 for increased resistance to pod shattering in common bean

Travis Parker, Lorenna Lopes De Sousa, Talissa De Oliveira Floriani, Antonia Palkovic & Paul Gepts
Some varieties of common bean (Phaseolus vulgaris L.) suffer from pod shattering, which can severely reduce yields, especially in arid conditions. The PvPdh1 locus on chromosome Pv03 has recently been described as a major locus controlling pod shattering in common bean and could be used to mitigate pod shattering in the future. Despite this, the role of a possible second locus on chromosome Pv08 remains unclear and patterns of dominance and epistasis between alleles of...

Physiology trait and growing region climate data compiled from the literature for 34 wine grape cultivars

Megan Bartlett & Gabriela Sinclair
Selection for crop cultivars has largely focused on reproductive traits, while the impacts of global change on crop productivity are expected to depend strongly on the vegetative physiology traits that drive plant resource use and stress tolerance. We evaluated relationships between physiology traits and growing season climate across winegrape cultivars to characterize trait variation across growing regions and elucidate the mechanisms that adapted grapevines to hot, dry conditions. We compiled values from the literature for...

Data and Supplemental Material from: A multifunction trade-off has contrasting effects on the evolution of form and function

Katherine Corn, Christopher Martinez, Edward Burress & Peter Wainwright
Trade-offs caused by the use of an anatomical apparatus for more than one function are thought to be an important constraint on evolution. However, whether multifunctionality suppresses diversification of biomechanical systems is challenged by recent literature showing that traits more closely tied to trade-offs evolve more rapidly. We contrast the evolutionary dynamics of feeding mechanics and morphology between fishes that exclusively capture prey with suction and multifunctional species that augment this mechanism with biting behaviors...

Registration Year

  • 2020

Resource Types

  • Dataset


  • University of California, Davis
  • University of California, Berkeley
  • United States Geological Survey
  • University of Minnesota
  • United States Department of Agriculture
  • University of Florida
  • University of California, Santa Cruz
  • Cornell University
  • SUNY Downstate Medical Center
  • California State University, Northridge