45 Works

Data from: Scaling and relations of morphology with locomotor kinematics in the sidewinder rattlesnake Crotalus cerastes

Jessica L. Tingle, Brian M. Sherman & Theodore Garland
The movement of limbless terrestrial animals differs fundamentally from that of limbed animals, yet few scaling studies of their locomotor kinematics and morphology are available. We examined scaling and relations of morphology and locomotion in sidewinder rattlesnakes (Crotalus cerastes). During sidewinding locomotion, a snake lifts sections of its body up and forward while other sections maintain static ground contact. We used high-speed video to quantify whole-animal speed and acceleration; the height to which body sections...

Data For: Soil NH3 emissions across a rainfall gradient in southern California

Alexander Krichels
Soil ammonia (NH3) emissions are often overlooked pathways for ecosystem N loss; however, they may help sustain ecosystem nitrogen (N) limitation, especially in arid regions where hydrologic N losses are relatively small. To characterize controls over NH3 emissions, we measured NH3 losses from six dryland sites along a gradient in soil pH, atmospheric N deposition, and rainfall. We also added ammonium (NH4+) to determine whether emissions were limited by N. Soil NH3 emissions were positively...

NCST real world brake activity of heavy-duty vehicles

Brenda Lopez Reyna
This study uses a heavy-duty test vehicle to investigate the braking activity of HDVs. Brake parameters such as brake fluid pressure and brake temperature were measured along with the brake activity so that the brake activity can be characterized along with brake parameters. Ambient temperature, location, and speed were also measured. Testing was done by using simulated driving in a chassis dynanometer as well as real-world on road tests.

Bumble bee (B. vosnesenskii) queen nest searching occurs independent of ovary developmental status

Erica Sarro, Amber Tripodi & S Hollis Woodard
Studies on the physiological states of wild-caught organisms are essential to uncovering the links between ecological and physiological processes. Bumble bee queens emerge from overwintering in the spring. At this time, queens develop their ovaries and search for a nest site in which to start a colony. Whether these two processes, ovary development and nest-searching, interact with or influence one another remains an unresolved question in behavioral physiology. We explored the hypothesis that ovary development...

Sound recordings of courtship displays of Allen's (Selasphorus sasin), Rufous (S. rufus), and Hybrid (S. sasin x S. rufus) hummingbirds recorded between 2014 and 2021 in California, Oregon, and Alaska

Chris Clark, Brian Myers & David Rankin
These are sound recordings of courtship displays that are associated with the 386 individual Selasphorus hummingbirds that are the focus of analyses presented in Myers et al 2022. A subset of these birds were also used in Myers et al. (2019), and 159 of them have been deposited as specimens in the San Diego State University Museum of Biodiversity or the San Diego Natural History Museum. Many recordings will include a verbal tag from CJC,...

Pollen diet mediates how pesticide exposure impacts brain gene expression in nest-founding bumble bee queens

Claudineia Costa, Mar Leza, Michelle Duennes, Kaleigh Fisher, Alyssa Vollaro, Manhoi Hur, Jay Kirkwood & S. Hollis Woodard
A primary goal in biology is to understand the effects of multiple, interacting environmental stressors on organisms. Wild and domesticated bees are exposed to a wide variety of interacting biotic and abiotic stressors, with widespread declines in floral resources and agrochemical exposure being two of the most important. In this study, we used examinations of brain gene expression to explore the sublethal consequences of neonicotinoid pesticide exposure and pollen diet composition in nest-founding bumble bee...

Los Angeles 100-year flood risk

Jochen Schubert, Brett Sanders, Daniel Kahl, Katharine Mach, David Brady, Amir AghaKouchak, Fonna Forman, Richard Matthew, Nicola Ulibarri & Steven Davis
Flood risks in the U.S. have historically been underestimated, particularly with respect to human well-being and within low-wealth and marginalized communities. Here, we characterize a fuller range of risks in Los Angeles, California, using a quantitative framework that intersects flood hazards from rainfall, streamflow, and storm tides with measures of exposure and vulnerability including ethnicity, race, and socioeconomic disadvantage. We find that between 197 and 974 thousand (K) people (median=425K), and between $36 and $108...

Unequal reproduction early in a social transition

Madison Sankovitz, Kevin Loope, Erin Wilson Rankin & Jessica Purcell
In eusocial insects, nestmate queens can differ in their reproductive output, causing asymmetries in the distribution of mutual benefits. However, little is known about how reproductive success is partitioned in incipiently polygynous species, which would provide clues about the evolutionary forces shaping the emergence of polygyny. Here, we leverage a recent transition from predominantly single-queen (monogyne) to multiple-queen (polygyne) colonies in an invasive yellowjacket to investigate whether queens in incipiently polygyne colonies invest equally in...

Data from: Species recognition limits mating between hybridizing ant species

Pierre Blacher, Sacha Zahnd, Jessica Purcell, Amaury Avril, Thalita Oliveira Honorato, Gaëlle Bailat-Rosset, Davide Staedler, Alan Brelsford & Michel Chapuisat
Identifying mechanisms limiting hybridization is a central goal of speciation research. Here, we studied pre-mating and post-mating barriers to hybridization between two ant species, Formica selysi and Formica cinerea. These species hybridize in the Rhône valley in Switzerland, where they form a mosaic hybrid zone, with limited introgression from F. selysi into F. cinerea. There was no sign of temporal isolation between the two species in the production of queens and males. With choice experiments,...

Data for: Community science reveals high diversity of nectaring plants visited by painted lady butterflies (Lepidoptera: Nymphalidae) in California sage scrub

Erin Wilson Rankin, Jo'lene Saldivar & Andrea Romero
California’s sage scrub habitats support a diversity of nectar and host plants for migrating and resident populations of painted lady butterflies (Vanessa cardui) throughout all seasons. The V. cardui North American migration is not an annual occurrence and is instead dependent on winter weather patterns at breeding grounds near the US–Mexico border. Thus, the irregularity of these migrations makes it difficult to study floral resource use along the migration route. Here we used the community...

Pinyon Flats rainfall manipulation experiments: species composition and biomass

Marko Spasojevic
While altered precipitation regimes can greatly impact biodiversity and ecosystem functioning, we lack a comprehensive view of how these impacts are mediated by changes to the seasonality of precipitation (i.e., whether it rains more/less in one season relative to another). Over two years we examined how altered seasonal precipitation influenced annual plant biomass and species richness, Simpson’s diversity, and community composition of annual plant communities in a dryland ecosystem that receives both winter and summer...

Data from: Life histories as mosaics: plastic and genetic components differ among traits that underpin life-history strategies

Anja Felmy, David N. Reznick, Joseph Travis, Tomos Potter & Tim Coulson
Life-history phenotypes emerge from clusters of traits that are the product of genes and phenotypic plasticity. If the impact of the environment differs substantially between traits, then life histories might not evolve as a cohesive whole. We quantified the sensitivity of components of the life history to food availability, a key environmental difference in the habitat occupied by contrasting ecotypes, for 36 traits in fast-and slow-reproducing Trinidadian guppies. Our dataset included six putatively independent origins...

On the genetic architecture of rapidly adapting and convergent life history traits in guppies

James Whiting, Josephine Paris, Paul Parsons, Sophie Matthews, Yuridia Reynoso, Kimberly Hughes, David Reznick & Bonnie Fraser
The genetic basis of traits shapes and constrains how adaptation proceeds in nature; rapid adaptation can be facilitated by polygenic traits, which subsequently provide multiple, redundant, genetic routes to adaptive phenotypes, reducing re-use of the same genes (genetic convergence). Guppy life history traits evolve rapidly and convergently among natural high- (HP) and low-predation (LP) environments in northern Trinidad. This system has been studied extensively at the phenotypic level, but little is known about the underlying...

Data from: A socially polymorphic Formica ant species exhibits a novel distribution of social supergene genotypes

Daniel Pierce, Jessica Purcell, Alan Brelsford & Penglin Sun
Most supergenes discovered so far are young, occurring in one species or a few closely related species. An ancient supergene in the ant genus Formica presents an unusual opportunity to compare supergene-associated phenotypes and the factors that influence the persistence of polymorphism in different species. We investigate the genetic architecture of social organization in Formica francoeuri, an ant species native to low and mid-elevation semiarid regions of southern California, and describe an efficient technique for...

Amino acid d13C dataset for nearshore marine primary producers

Emma Elliott Smith, Michael Fox, Marilyn Fogel & Seth Newsome
Carbon isotope fingerprinting, or multivariate analysis using δ13C values of individual compounds, is a powerful tool in ecological studies, particularly measurements of essential amino acids (EAA δ13C). Despite the widespread application of this technique, there has been little methodological validation to determine (1) whether multivariate EAA δ13C signatures (fingerprints) of primary producer groups vary across space and time, and (2) what biochemical mechanisms drive these patterns. Here, we evaluate the spatiotemporal consistency in EAA δ13C...

The shape of aroma: X-ray CT scans of citrus fruits, their separate tissues, and their individual oil glands

Erik Amezquita, Michelle Quigley, Tim Ophelders, Danelle Seymour, Elizabeth Munch & Daniel Chitwood
From preventing scurvy to being part of religious rituals, citrus are intrinsically connected to human health and perception. From tiny mandarins to head-sized pummelos, citrus capability of hybridization provides a vastly diverse array of fruit sizes and shapes, which in turn corresponds to a diversity of flavors and aromas. These sensory qualities are tightly linked to oil glands in the citrus skin. The oil glands are also key to understanding fruit development, and the essential...

Species provenance and traits mediate establishment and performance in an invaded grassland

Lachlan Charles, John Maron & Loralee Larios
In many invaded grasslands, dominant exotic species can produce large amounts of litter that modify local abiotic conditions and species’ interactions. These novel conditions can reduce native species abundance and promote the persistence of exotic species, yet the strength of this disparity may be influenced by how consumer pressure interacts with litter accumulation. Consumers may exacerbate this disparity by preferentially targeting native species or by promoting heterogeneity in microhabitats due to their movement and small-scale...

Data from: Correlated evolution between orb weaver glue droplets and supporting fibers maintains their distinct biomechanical roles in adhesion

Sean Kelly
Orb weaving spiders employ a “silken toolkit” to accomplish a range of tasks, including retaining prey that strike their webs. This is accomplished by a viscous capture thread spiral thread that features tiny glue droplets, supported by a pair of elastic flagelliform fibers. Each droplet contains a glycoprotein core responsible for adhesion. However, prey retention relies on the integrated performance of multiple glue droplets and their supporting fibers, with previous studies demonstrating that a suspension...

Real-world heavy-duty truck trajectories on signalized corridors

Zhensong Wei, Dylan Brown, Peng Hao & Kanok Boriboonsomsin
This dataset contains real-world trajectories of a heavy-duty truck traveling on two urban freight corridors—Alameda St and Wilmington Ave—near the Ports of Los Angeles and Long Beach in California. Some of the signalized intersections on these two corridors have been instrumented with communication devices to enable a connected vehicle application called Eco-Approach and Departure (EAD). The EAD application uses signal phase and timing information from the upcoming traffic signal along with the information about the...

Secondary brown carbon from photooxidation of 1-methylnaphthalene and longifolene

Roya Bahreini
An improved understanding of the optical properties of secondary organic aerosol (SOA) particles is needed to better predict their climate impacts. Here, SOA was produced by reacting 1-methylnaphthalene or longifolene with hydroxyl radicals (OH) under variable ammonia (NH3), nitrogen oxide (NOx), and relative humidity (RH) conditions. In the presence of NH3 and NOx, longifolene-derived aerosols had relatively high single scattering albedo (SSA) values and low absorption coefficients at 375 nm independent of RH, suggesting that...

Transcriptional analysis in TNFdeltaARE mice to study progression of Crohn's-ileitis and assess relative benefits of global TNF blockade versus TNFR1 targeted modulation

Rajrupa Chakraborty
Background and Aims: Crohn’s disease is a debilitating chronic inflammatory disorder of the mammalian gastrointestinal tract. While current therapeutic interventions using anti-TNF biologics show long-term benefit in up to half of the patients, broadly effective approaches are still needed. This study focused on the role of the TNF receptor 1 (TNFR1) in disease pathogenesis in a TNF-driven model of ileitis, and the relative benefits of global TNF blockade versus TNFR1-targeted modulation. Methods: We studied genetically...

Isotopic signatures of methane emissions from dairy farms in California's San Joaquin Valley

Valerie Carranza, Brenna Biggs, Deanne Meyer, Amy Townsend-Small, Ranga Thiruvenkatachari, Akula Venkatram, Marc Fischer & Francesca Hopkins
In this study, we present seasonal atmospheric measurements of δ13CCH4 from dairy farms in the San Joaquin Valley of California. We used δ13CCH4 to characterize emissions from enteric fermentation by measuring downwind of cattle housing (e.g., freestall barns, corrals) and from manure management areas (e.g., anaerobic manure lagoons) with a mobile platform equipped with cavity ring-down spectrometers. Across seasons, the δ13CCH4 from enteric fermentation source areas ranged from -69.7 ± 0.6 per mil (‰) to...

Characterizing North American Ipomoea grandifolia (Convolvulaceae), a member of Ipomoea series batatas

Irene Liao, Avery Fulford, Kate Ostevik & Mark Rausher
Species in the genus Ipomoea are often difficult to identify due to their similar morphologies and their ability to hybridize with one another. An undescribed North American Ipomoea morphotype in series Batatas, referred here as Ipomoea Carolina morphotype, was found to be morphologically, genetically, and reproductively isolated from other locally co-occurring Ipomoea species. A previous phylogenetic analysis that included a broader sampling of species in Ipomoea series Batatas suggested that Ipomoea Carolina morphotype may be...

Reductions in California's urban fossil fuel CO2 emissions during the COVID-19 pandemic

Cindy Yañez, Francesca Hopkins, Xiaomei Xu, Joana Tavares, Allison Welch & Claudia Czimczik
Fossil fuel carbon dioxide emissions (ffCO2) constitute the majority of greenhouse gas emissions and are the main determinent of global climate change. The COVID-19 pandemic caused wide-scale disruption to human activity and provided an opportunity to evaluate our capability to detect ffCO2 emission reductions. Quantifying changes in ffCO2 levels is especially challenging in cities, where climate mitigation policies are being implemented but local emissions lead to spatially and temporally complex atmospheric mixing ratios. Here, we...

Species and environmental datasets from Sierra Nevada, CA (USA) streams in lake-stream networks

Matthew Green, David Herbst, Kurt Anderson & Marko Spasojevic
A major goal of community ecology is understanding the processes responsible for generating biodiversity patterns along spatial and environmental gradients. In stream ecosystems, system specific conceptual frameworks have dominated research describing biodiversity change along longitudinal gradients of river networks. However, support for these conceptual frameworks has been mixed, mainly applicable to specific stream ecosystems and biomes, and these frameworks have placed less emphasis on general mechanisms driving biodiversity patterns. Rethinking biodiversity patterns and processes in...

Registration Year

  • 2022

Resource Types

  • Dataset


  • University of California, Riverside
  • University of California, Irvine
  • University of California, Davis
  • University of California Los Angeles
  • Duke University
  • University of Georgia
  • North Carolina State University
  • Michigan State University
  • University of Massachusetts Amherst
  • University of Montana