9 Works


Sara Lipshutz, Clara Howell, Aaron Buechlein, Rusch Douglas, Kimberly Rosvall & Elizabeth Derryberry
In a rapidly warming world, exposure to high temperatures may impact fitness, but the gene regulatory mechanisms that link sublethal heat to sexually selected traits are not well understood, particularly in endothermic animals. Our experiment used zebra finches (Taeniopygia guttata), songbirds that experience extreme temperature fluctuations in their native Australia. We exposed captive males to an acute thermal challenge (43°C) compared with thermoneutral (35°C) and lower (27°C) temperatures. We found significantly more heat dissipation behaviors...

Combining GWAS and population genomic analyses to characterize coevolution in a legume-rhizobia symbiosis

Brendan Epstein, Liana Burghardt, Katy Heath, Michael Grillo, Adam Kostanecki, Tuomas Hämälä, Nevin Young & Peter Tiffin
The mutualism between legumes and rhizobia is clearly the product of past coevolution. However, the nature of ongoing evolution between these partners is less clear. To characterize the nature of recent coevolution between legumes and rhizobia, we used population genomic analysis to characterize selection on functionally annotated symbiosis genes as well as on symbiosis gene candidates identified through a two-species association analysis. For the association analysis, we inoculated each of 202 accessions of the legume...

Attempting genetic inference from directional asymmetry during convergent hindlimb reduction in squamates

Samantha Swank, Ethan Elazegui, Sophia Janidlo, Thomas Sanger, Michael Bell & Yoel Stuart
Loss and reduction of paired appendages is common in vertebrate evolution. How often does such convergent evolution depend on similar developmental and genetic pathways? For example, many populations of the Threespine Stickleback and Ninespine Stickleback (Gasterosteidae) have independently evolved pelvic reduction, usually based on independent mutations that caused reduced Pitx1 expression. Reduced Pitx1 expression has also been implicated in pelvic reduction in manatees. Thus, hind limb reduction stemming from reduced Pitx1 expression has arisen independently...

Discordant population structure among rhizobium divided genomes and their legume hosts

Alex Riley, Michael Grillo, Brendan Epstein, Peter Tiffin & Katy Heath
Symbiosis often occurs between partners with distinct life history characteristics and dispersal mechanisms. Many bacterial symbionts have genomes comprised of multiple replicons with distinct rates of evolution and horizontal transmission. Such differences might drive differences in population structure between hosts and symbionts and among the elements of the divided genomes of bacterial symbionts. These differences might, in turn, shape the evolution of symbiotic interactions and bacterial evolution. Here we use whole-genome resequencing of a hierarchically-structured...

Greenhouse plant-soil feedback experiment at Cedar Creek Ecosystem Science Reserve

Ray Dybzinski, David Tilman & Noelle Beckman
We conducted a reciprocal greenhouse experiment to examine how the growth of prairie grass species depended on the soil communities conditioned by conspecific or heterospecific plant species in the field. The source soil came from monocultures in a long-term competition experiment (LTCE, Cedar Creek Ecosystem Science Reserve, MN, USA). Within the LTCE, six species of perennial prairie grasses were grown in monocultures or in eight pairwise competition plots for 12 years under conditions of low...

Social polyandry shapes sperm morphology

Sara Lipshutz
Sexual selection is a major driver of trait variation, and the intensity of male competition for mating opportunities has been linked with sperm size across diverse taxa. Mating competition among females may also shape the evolution of sperm traits, but the interplay between female-female competition and male-male competition on sperm morphology is not well understood. We evaluated variation in sperm morphology in two species with socially polyandrous mating systems, in which females compete to mate...

Hypoxia-induced predation refuge for northern quahogs (Mercenaria mercenaria) in a temperate estuary

Bryan Galligan, Yoel Stuart, M. Conor McManus & Heather Stoffel
Oxygen depletion in estuaries and coastal waters is often associated with reduced biodiversity, coastal dead zones, and the loss of important ecosystem services. However, some species can benefit from low oxygen conditions due to the indirect effects these conditions have on trophic relationships. In Narragansett Bay, Rhode Island, U.S.A., northern quahogs (Mercenaria mercenaria) reach their highest densities in the areas of the Bay most prone to oxygen depletion. One line of evidence suggests that suboxic...

Phylogenomics and fossil data inform the systematics and geographic range evolution of a diverse Neotropical ant lineage

Benjamin Blanchard, Shauna Price, Scott Powell, Bonnie Blaimer & Corrie Moreau
Recent advances in phylogenomics allow for the use of large amounts of genetic information in phylogenetic inference. Ideally, the increased resolution and accuracy of such inferences facilitate improved understanding of macroevolutionary processes. Here, we integrate ultraconserved elements (UCEs) with fossil and biogeographic range data to explore diversification and geographic range evolution in the diverse turtle ant genus Cephalotes. We focus on the potential role of the uplift of the Panamanian land bridge and the putative...

A genome-wide test for paternal indirect genetic effects on lifespan in Drosophila melanogaster

Vinesh N Shenoi, Martin I Brengdahl, Jaime L Grace, Björn Eriksson, Patrik Rydén & Urban Friberg
Exposing sires to various environmental manipulations has demonstrated that paternal effects can be non-trivial also in species where male investment in offspring is almost exclusively limited to sperm. Whether paternal effects also have a genetic component (i.e. paternal indirect genetic effects - PIGEs) in such species is however largely unknown, primarily because of methodological difficulties separating indirect from direct effects of genes. PIGEs may nevertheless be important, since they have the capacity to contribute to...

Registration Year

  • 2022

Resource Types

  • Dataset


  • Loyola University Chicago
  • University of Minnesota
  • Utah State University
  • Field Museum of Natural History
  • Duke University
  • George Washington University
  • University of Rhode Island
  • Rhode Island Department of Environmental Management
  • Indiana University
  • University of Tennessee at Knoxville