50 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...

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...

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: 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...

Decoupled dust deposition and ocean productivity in the Antarctic Zone of the Southern Ocean over the past 1.5 million years

Michael E. Weber , Ian Bailey , Sidney R. Hemming , Yasmina M. Martos , Brendan T. Reilly , Thomas A. Ronge , Stefanie Brachfeld , Trevor Williams , Maureen Raymo , Simon T. Belt , Hendrik Vogel , Victoria Peck , Linda Armbrecht , Alix Cage , Fabricio G. Cardillo , Zhiheng Du , Gerson Fauth , Christopher J. Fogwill , Marga Garcia , Marlo Garnsworthy , Anna Glüder , Michelle Guitard , Marcus Gutjahr , Iván Hernández-Almeida , Frida S. Hoem … & Xufeng Zheng
Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages and their role in influencing the carbon cycle. We report the first high-resolution record of dust deposition and ocean productivity for the Antarctic Zone, close to the main dust source, Patagonia. Our deep-ocean records cover the last 1.5 Ma, thus doubling that from Antarctic ice-cores. We find a ≥10-fold increase in dust deposition during glacials and a ≤5-fold...

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...

DNA metabarcoding reveals broad woodpecker diets in fire-maintained forests

Andrew Stillman, Marcos Caiafa, Teresa Lorenz, Michelle Jusino & Morgan Tingley
Ecological disturbance is a key agent shaping the spatial and temporal landscape of food availability. In forests of western North America, disturbance from fire can lead to resource pulses of deadwood-associated arthropods that provide important prey for woodpeckers. Although the foraging strategies among woodpecker species often demonstrate pronounced differences, little is known about the ways in which woodpeckers exploit and partition prey in disturbed areas. In this study, we employed DNA metabarcoding to characterize and...

Data from: Anderson lab experiments from synthesizing the effects of spatial network structure on predator prey dynamics

Matthew Green, Kurt Anderson, Clara Woodie, Megan Whitesell & Sean Hayes
Predator-prey persistence is thought to be enhanced by spatial heterogeneity. Theory predicts that metacommunity size, spatial connectivity, network synchrony, predator identity, and productivity influence predator-prey persistence, through a variety of mechanisms such as statistical stabilization, colonization-extinction dynamics, and trophic interactions. However, comparative tests and synthesis of the multiple factors and mechanisms across different spatial networks are needed to understand which factors and mechanisms of spatial network structure promote predator-prey persistence. To address this gap between...

DNA metabarcoding reveals broadly overlapping diets in three sympatric North American hummingbirds

Austin Spence, Morgan Tingley & Erin Wilson Rankin
Hummingbirds, a highly diverse avian family, are specialized vertebrate pollinators that feed upon carbohydrate-rich nectar to fuel their fast metabolism while consuming invertebrates to obtain protein. Previous work has found that morphologically diverse hummingbird communities exhibit higher diet specialization on floral resources than morphologically similar hummingbird communities. Due to the difficulties of studying avian diets, we have little understanding whether hummingbirds show similar patterns with their invertebrate prey. Here, we use DNA metabarcoding to complete...

Data for: Specificity of California mouse pup vocalizations in response to olfactory stimuli

Kerianne Wilson, Victoria Wagner & Wendy Saltzman
To investigate flexibility in vocal signaling by rodent pups, we examined whether olfactory stimuli influence characteristics of pup calls and how these calls may be affected by sex and litter size in California mice (Peromyscus californicus). Pups were isolated and recorded during a 3-minute baseline period followed by a 5-minute exposure to bedding containing scent from their home cage, scent from the home cage of an unfamiliar family, coyote urine, or no scent (control). Latency...

Seminatural habitat surrounding farms promotes multifunctionality in avian ecosystem services

Elissa Olimpi, Karina Garcia, David Gonthier, Claire Kremen, William Snyder, Erin Wilson-Rankin & Daniel Karp
Farmland birds can suppress insect pests, but may also consume beneficial insects, damage crops, and potentially carry foodborne pathogens. As bird communities shift in response to farming practices, so too do the benefits (services) and costs (disservices) from birds. Understanding how and why ecosystem services and disservices covary can inform management interventions that enhance synergies, avoid tradeoffs, and promote multifunctionality. We investigated how farmland diversification practices influence the services and disservices provided by wild birds...

North Korean Refugees' Social Comparison Concerns and Competitive Attitudes.

Ahlam Lee, Eun-A Park & HyunJung Jo
This study will investigate whether there is a difference in social comparison concerns and competitive attitudes by age and socioeconomic status (SES) among North Korean Refugees (NKRs). Given that there is a growing refugee population and competition is ubiquitous, this study would provide insights into the psychological mechanism of a refugee population. NKRs' experiences encompassing living in North Korea, migration processes from North to South Korea, and resettlement processes in South Korea would differ depending...

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...

Registration Year

  • 2022
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  • University of California, Riverside
    48
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  • British Antarctic Survey
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