5 Works

Intraspecific variation in symbiont density in an insect-microbe symbiosis

Benjamin Parker, Jan Hrcek, Ailsa McLean, Charles Godfray & Jennifer Brisson
Many insects host vertically-transmitted microbes, which can confer benefits to their hosts but are costly to maintain and regulate. A key feature of these symbioses is variation: for example, symbiont density can vary among host and symbiont genotypes. However, the evolutionary forces maintaining this variation remain unclear. We studied variation in symbiont density using the pea aphid (Acyrthosiphon pisum) and the bacterium Regiella insecticola, a symbiont that can protect its host against fungal pathogens. We...

Putative resistance and tolerance mechanisms have little impact on disease progression for an emerging salamander pathogen

Mark Wilber, Edward Carter, Matthew Gray & Cheryl Briggs
1. Resistance and tolerance are unique host defense strategies that can limit the impacts of a pathogen on a host. However, for most wildlife-pathogen systems there are still fundamental uncertainties regarding 1) how changes in resistance and tolerance can affect disease outcomes and 2) the mechanisms underlying resistance and tolerance in host populations. 2. Here, we first compared observed patterns of resistance and tolerance and their effects on disease outcomes among salamander species that are...

Data from: Genetic data reveal fine-scale ecological segregation between larval plethodontid salamanders in replicate contact zones

Todd Pierson, Carlos Camp & Benjamin Fitzpatrick
Contact zones present unique opportunities to investigate ecological divergence, reproductive barriers, and gene flow between species. The two-lined salamander (Eurycea bislineata) species complex is a group of semiaquatic plethodontid salamanders with a reticulate evolutionary history that reflects the reorganization of river drainage basins. Although evidence for widespread, ancient introgression suggests an absence of reproductive isolating mechanisms in the early evolutionary history of the group, modern contact zones reveal a broader diversity of outcomes—with some putative...

Wing plasticity and associated gene expression varies across the pea aphid biotype complex

Benjamin J. Parker, Rose M. H. Driscoll, Mary E. Grantham, Jan Hrcek & Jennifer A. Brisson
Developmental phenotypic plasticity is a widespread phenomenon that allows organisms to produce different adult phenotypes in response to different environments. Investigating the molecular mechanisms underlying plasticity has the potential to reveal the precise changes that lead to the evolution of plasticity as a phenotype. Here, we study wing plasticity in multiple host-plant adapted populations of pea aphids as a model for understanding adaptation to different environments within a single species. We describe the wing plasticity...

Data from: Pervasive cropland in protected areas highlight trade-offs between conservation and food security

Varsha Vijay & Paul Armsworth
Global cropland expansion over the last century caused widespread habitat loss and degradation. Establishment of protected areas aims to counteract the loss of habitats and to slow species extinctions. However, many protected areas also include high levels of habitat disturbance and conversion for uses such as cropland. Understanding where and why this occurs may realign conservation priorities and inform protected area policy in light of competing priorities such as food security. Here we use a...

Registration Year

  • 2021

Resource Types

  • Dataset


  • University of Tennessee at Knoxville
  • University of Rochester
  • Kennesaw State University
  • University of California, Santa Barbara
  • National Socio-Environmental Synthesis Center
  • Piedmont College
  • University of Oxford
  • Czech Academy of Sciences