12 Works

Data from: The effects of diet and mating system on reproductive (and post-reproductive) lifespan in a freshwater snail

Josh R. Auld
The length of the reproductive lifespan, along with the number/frequency/magnitude of reproductive events, quantifies an individual’s potential contribution to the next generation. By examining reproductive lifespan, and distinguishing it from somatic lifespan, we gain insight into critical aspects of an individual’s potential fitness as well as reproductive and somatic senescence. Additionally, differentiating somatic and reproductive lifespans can provide insight into the existence of a post-reproductive period and factors that shape its duration. Given the known...

Data from: Age-dependent effects of predation risk on reproductive success in a freshwater snail

Josh R. Auld & Ryan Houser
Reproductive performance is often age-dependent, showing patterns of improvement and/or senescence as well as trade-offs with other traits throughout the lifespan. High levels of extrinsic mortality (e.g., from predators) have been shown to sometimes, but not always, select for accelerated actuarial senescence in nature and in the lab. Here we explore the inductive (i.e., plastic) effects of predation risk (i.e., non-lethal exposure to chemical cues from predators) on the reproductive success of freshwater snails (Physa...

Data from: Increased signal complexity is associated with increased mating success

Noori Choi, Matt Adams, Kasey Fowler-Finn, Elise Knowlton, Malcolm Rosenthal, Aaron Rundus, Roger Santer, Dustin Wilgers & Eileen Hebets
The evolution of complex signaling has often been explored by testing multiple functional hypotheses that vary in their underlying assumptions about how independent signal components provide selective benefits to offset the costs of their production. In the present study, we take a different approach to exploring the function of complexity per se. We test the hypothesis that increased vibratory signal complexity – based on both proportional and temporal patterning - provides selective benefits to courting...

Negative frequency-dependent selection maintains coexisting genotypes during fluctuating selection

Vaughn Cooper, Caroline Turner, Sean Buskirk & Katrina Harris
Natural environments are rarely static; rather selection can fluctuate on time scales ranging from hours to centuries. However, it is unclear how adaptation to fluctuating environments differs from adaptation to constant environments at the genetic level. For bacteria, one key axis of environmental variation is selection for planktonic or biofilm modes of growth. We conducted an evolution experiment with Burkholderia cenocepacia, comparing the evolutionary dynamics of populations evolving under constant selection for either biofilm formation...

Brief Report: Employees’ Perceptions of Stress and Support During a Pandemic Mandated Telework

Dimple Sunayna Johnson, Aaron Johnson, Kristen Crossney & Emily Devereux
COVID-19 has forced the knowledge-based workforce into full-time remote work, amplifying every-day stressors. The crisis has resulted in employees having to juggle work and home life simultaneously, while forcing many organizations with little to no experience to implement and manage teleworking. This brief study explores employee perceived stress as it relates to perceived support and age within an American workforce during the COVID-19 pandemic. In a global era of uncertainty and crisis, the findings suggest...

Data from: Consequences of mating and predation risk for longevity in a freshwater snail: Abstinence makes the heart beat longer

Josh R. Auld, Adam D. Helker & Allison Kolpas
Senescence is not a static property of an individual or population, but rather it is a dynamic process that may be influenced by environmental conditions. This can occur in at least two ways: in the long-term across multiple generations, and in the short-term via phenotypic plasticity. The former has attracted a lot of attention, both theoretically and empirically; the latter has lagged behind. To determine whether two important environmental variables (predation risk and mate availability)...

Data from: Nanoaperture fabrication via colloidal lithography for single molecule fluorescence analysis

Shawn H. Pfeil, Kevin Y. Chen, Yale E. Goldman, Shane A. Fiorenza, Ryan M. Jamiolkowski & Alyssa M. Tate
In single molecule fluorescence studies, background emission from labeled substrates often restricts their concentrations to non-physiological nanomolar values. One approach to address this challenge is the use of zero-mode waveguides (ZMWs), nanoscale holes in a thin metal film that physically and optically confine the observation volume allowing much higher concentrations of fluorescent substrates. Standard fabrication of ZMWs utilizes slow and costly E-beam nano-lithography. Herein, ZMWs are made using a self-assembled mask of polystyrene microspheres, enabling...

Soil carbon cycle data from Pennsylvania forest fragment edges

Jessica Schedlbauer & Jason Miller
Anthropogenic disturbance has left the world's forests highly fragmented, with a significant proportion of edge-affected area. Abiotic changes at forest edges are likely to affect forest soil carbon cycling, as higher temperatures and lower moisture availability in edge environments have well-documented effects on soil respiration. The present study sought to quantify persistent changes in soil carbon cycling in the fragmented broadleaf forests of southeastern Pennsylvania. At three sites with >80 year old forest-field edges, three...

Zalophus hindflipper turning metrics and angle of attack

Ariel Leahy
California sea lions (Zalophus californianus) are a highly maneuverable species of marine mammal. During uninterrupted, rectilinear swimming, sea lions oscillate their foreflippers to propel themselves forward without aid from the collapsed hindflippers, which are passively trailed. During maneuvers such as turning and leaping (porpoising), the hindflippers are spread into a delta-wing configuration. There is little information defining the role of otarrid hindflippers as aquatic control surfaces. To examine Z. californianus hindflippers during maneuvering, trained sea...

Shell shape and environmental data for five North American land snail species

Russell Minton, Nicholas Fagan & Ashley Meyer
The morphological distinctness of land snail shells is almost certainly related to the unique environments in which they live. Even with the development of genetic and epigenetic tools for understanding factors contributing to phenotype, much research is focused on understanding environmental effects on land snail shell form. Most studies focus on single taxa, with review articles summarizing shared patterns and correlations of shell response to the environment. Herein we provide a dataset of shell shapes...

Data from: Morphology of the core fibrous layer of the cetacean tail fluke

William T. Gough, Frank E. Fish, Dylan K. Wainwright & Hilary Bart-Smith
The cetacean tail fluke blades are not supported by any vertebral elements. Instead, the majority of the blades are composed of a densely packed collagenous fiber matrix known as the core layer. Fluke blades from six species of odontocete cetaceans were examined to compare the morphology and orientation of fibers at different locations along the spanwise and chordwise fluke blade axes. The general fiber morphology was consistent with a three‐dimensional structure comprised of two‐dimensional sheets...

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