State transitions are changes in ecosystem structure and self-reinforcing feedbacks that are initiated when an exogenous driver variable crosses a threshold. Reversing state transitions is difficult and costly. While some state transitions are relatively rapid, many take years to decades. Outside of theoretical models, very little is known about slower state transitions and how they unfold in time and space. We quantified changes in spatial variance as a mesic grassland ecosystem shifts to a shrub-dominated...
Data from: Adaptive, but not condition-dependent, body shape differences contribute to assortative mating preferences during ecological speciationRyan Greenway, Shannon Drexler, Lenin Arias-Rodriguez & Michael Tobler
Assortative mating is critical for reproductive isolation during speciation, however, the mechanisms underlying mating preferences are often unknown. Assortative mating can be mediated through preferences for condition-dependent and adaptive (“magic”) traits, but rigorously testing these hypotheses has been impeded by trait covariation in living organisms. We used computer-generated models to examine the role of body shape in producing association preferences between fish populations undergoing ecological speciation in different habitat types. We demonstrate that body shape...
Data from: A before-and-after assessment of patch-burn grazing and riparian fencing along headwater streamsDanelle M. Larson, Walter K. Dodds, Matt R. Whiles, Jessica N. Fulgoni & Thomas R. Thompson
Fire and grazing are common in grasslands world-wide to maintain grass cover and cattle production. The effects of fire, cattle grazing and riparian fencing efficacy on prairie stream ecology are not well characterized at catchment scales. We examined alterations to stream water quality and biology from patch-burn grazing (PBG) in tallgrass prairie during a five-year, replicated, catchment scale experiment that used a Before-After/Control-Impact (BACI) design and was analysed by mixed-effects models. Treatments included two patch-burned...
Data from: Spatial and successional dynamics of microbial biofilm communities in a grassland stream ecosystemAllison M. Veach, James C. Stegen, Shawn P. Brown, Walter K. Dodds & Ari Jumpponen
Biofilms represent a metabolically active and structurally complex component of freshwater ecosystems. Ephemeral prairie streams are hydrologically harsh and prone to frequent perturbation. Elucidating both functional and structural community changes over time within prairie streams provides a general understanding of microbial responses to environmental disturbance. We examined microbial succession of biofilm communities at three sites in a third-order stream at Konza Prairie over a 2- to 64-day period. Microbial abundance (bacterial abundance, chlorophyll a concentrations)...
Data from: Extremophile Poeciliidae: multivariate insights into the complexity of speciation along replicated ecological gradientsRüdiger Riesch, Michael Tobler, Hannes Lerp, Jonas Jourdan, Tess Doumas, Patrik Nosil, R. Brian Langerhans & Martin Plath
Background: Replicate population pairs that diverge in response to similar selective regimes allow for an investigation of (a) whether phenotypic traits diverge in a similar and predictable fashion, (b) whether there is gradual variation in phenotypic divergence reflecting variation in the strength of natural selection among populations, (c) whether the extent of this divergence is correlated between multiple character suites (i.e., concerted evolution), and (d) whether gradual variation in phenotypic divergence predicts the degree of...
MYB transcription factors play an important role in regulating key plant developmental processes involving defense, cell shape, pigmentation, and root formation. Within this gene family, sequences containing an R2R3 MYB domain are the most abundant type and exhibit a wide diversity of functions. In this study, we identify 559 R2R3 MYB genes using whole genome data from four species of Solanaceae and reconstruct their evolutionary relationships. We compare the Solanaceae R2R3 MYBs to the well-characterized...
Data from: Ecological mismatches are moderated by local conditions in two populations of a long-distance migratory birdNathan Senner, Maria Stager, Brett K. Sandercock & Nathan R. Senner
Ecological mismatches between reproductive events and seasonal resource peaks are frequently proposed to be a key driver of population dynamics resulting from global climate change. Many local populations are experiencing reduced reproductive success as a consequence of mismatches, but few mismatches have led to species-level population declines. To better understand this apparent paradox, we investigated the breeding phenology and chick survival of two disjunct populations of Hudsonian godwits Limosa haemastica breeding at Churchill, Manitoba and...
Data from: Experimental evidence of genome-wide impact of ecological selection during early stages of speciation-with-gene-flowScott P. Egan, Gregory J. Ragland, Lauren Assour, Thomas H. Q. Powell, Glen R. Hood, Scott Emrich, Patrik Nosil, Jeffrey L. Feder & Thomas H.Q. Powell
Theory predicts that speciation-with-gene-flow is more likely when the consequences of selection for population divergence transitions from mainly direct effects of selection acting on individual genes to a collective property of all selected genes in the genome. Thus, understanding the direct impacts of ecologically based selection, as well as the indirect effects due to correlations among loci, is critical to understanding speciation. Here, we measure the genome-wide impacts of host-associated selection between hawthorn and apple...
Data from: Cold adaptation increases rates of nutrient flow and metabolic plasticity during cold exposure in Drosophila melanogasterCaroline M. Williams, Marshall D. McCue, Nishanth E. Sunny, Andre Szejner-Sigal, Theodore J. Morgan, David B. Allison & Daniel A. Hahn
Metabolic flexibility is an important component of adaptation to stressful environments, including thermal stress and latitudinal adaptation. A long history of population genetic studies suggest that selection on core metabolic enzymes may shape life histories by altering metabolic flux. However, the direct relationship between selection on thermal stress hardiness and metabolic flux has not previously been tested. We investigated flexibility of nutrient catabolism during cold stress in Drosophila melanogaster artificially selected for fast or slow...
Data from: Phylogeography and species delimitation in convict cichlids (Cichlidae: Amatitlania): implications for taxonomy and Plio–Pleistocene evolutionary history in Central AmericaJustin C. Bagley, Wilfredo A. Matamoros, Caleb D. McMahan, Michael Tobler, Prosanta Chakrabarty & Jerald B. Johnson
We investigate phylogeographic patterns and delimit species boundaries within Amatitlania, a genus of Central American cichlid fishes. Phylogenetic analyses of mitochondrial DNA sequences from 318 individuals spanning the geographical ranges of all three currently recognized Amatitlania species strongly supported one major clade, with a relatively diverged subclade corresponding to A. kanna samples from eastern Costa Rica and Panama. Gene trees and networks revealed marked incongruences between phylogeographic structure and morpho-species taxonomy as a result of...
Data from: Divergence of the diapause transcriptome in apple maggot flies: winter regulation and post-winter transcriptional repressionPeter J. Meyers, Thomas H. Q. Powell, Kimberly K. O. Walden, Adam Shieferecke, Jeffrey L. Feder, Daniel A. Hahn, Hugh M. Robertson, Stewart H. Berlocher & Gregory J. Ragland
Duration of dormancy regulates seasonal timing in many organisms and may be modulated by day length and temperature. Though photoperiodic modulation has been well studied, temperature modulation of dormancy has received less attention. Here, we leverage genetic variation in diapause in the apple maggot fly, Rhagoletis pomonella, to test whether gene expression during winter or following spring warming regulates diapause duration. We used RNAseq to compare transcript abundance during and after simulated winter between an...
Kansas State University11
University of Florida3
University of Notre Dame2
University of California, Berkeley2
University of Illinois System2
University of Sheffield2
University of Kansas1
North West Agriculture and Forestry University1
University of Montana1
University of Alabama at Birmingham1