4 Works

Data from: Exogenous glucocorticoids amplify the costs of infection by reducing resistance and tolerance, but effects are mitigated by co-infection

Laura A. Schoenle, Ignacio T. Moore, Alana M. Dudek, Ellen B. Garcia, Morgan Mays, Mark F. Haussmann, Daniela Cimini & Frances Bonier
Individual variation in parasite defenses, such as resistance and tolerance, can underlie heterogeneity in fitness and could influence disease transmission dynamics. Glucocorticoid hormone concentrations often change in response to fluctuating environmental conditions and mediate changes in immune function, resource allocation, and tissue repair. Thus, changes in glucocorticoid hormone concentrations might mediate individual variation in investment in resistance versus tolerance. In this study, we experimentally increased glucocorticoid concentrations in red-winged blackbirds (Agelaius phoeniceus) that were naturally...

Genomic data reveal similar genetic differentiation in aquifer species with different dispersal capabilities and life histories

Steve Jordan, Brian Hand, Scott Hotaling, Amanda DelVecchia, Rachel Malison, Clark Nissley, Gordon Luikart & Jack Standford
Little is known about the life histories, genetic structure, and population connectivity of shallow groundwater organisms. We used next-generation sequencing (RAD-seq) to analyze population genomic structure in two aquifer species: Paraperla frontalis (Banks, 1902), a stonefly with groundwater larvae and aerial (winged) adults, and Stygobromus sp., a groundwater-obligate amphipod. We found similar genetic differentiation in each species between floodplains separated by ~70 river km in the Flathead River basin of NW Montana, USA. Given that...

Data from: Higher-level phylogeny and reclassification of Lampyridae (Coleoptera: Elateroidea)

Gavin Martin, Kathrin Stanger-Hall, Marc Branham, Luiz Da Silveira, Sarah Lower, David Hall, Xue-Yan Li, Alan Lemmon, Emily Lemmon & Seth Bybee
Fireflies (Lampyridae) are a diverse family of beetles which exhibit an array of morphologies including varying antennal and photic organ morphologies. Due in part to their morphological diversity, the classification within the Lampyridae has long been in flux. Here we use an anchored hybrid enrichment approach to reconstruct the most extensive molecular phylogeny of Lampyridae to date (436 loci and 98 taxa) and to evaluate firefly higher-level classification. We propose several classification changes supported by...

Is there an oxidative cost of acute stress? Characterization, implication of glucocorticoids, and modulation by prior stress experience

Mark Haussmann
Acute rises in glucocorticoid hormones allow individuals to adaptively respond to environmental challenges but may also have negative consequences, including oxidative stress. While the effects of chronic glucocorticoid exposure on oxidative stress have been well characterized, those of acute stress or glucocorticoid exposure have mostly been overlooked. We examined the relationship between acute stress exposure, glucocorticoids, and oxidative stress in Japanese quail (Coturnix japonica). We (i) characterized the pattern of oxidative stress during an acute...

Registration Year

  • 2019
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  • Bucknell University
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