16 Works

Data from: Sex ratio and gamete size across eastern North America in Dictyostelium discoideum, a social amoeba with three sexes

Tracy E. Douglas, Joan E. Strassmann & David C. Queller
Theory indicates that numbers of mating types should tend towards infinity or remain at two. The social amoeba, Dictyostelium discoideum, however, has three mating types. It is therefore a mystery how this species has broken the threshold of two mating types, but has not increased towards a much higher number. Frequency dependent selection on rare types in combination with isogamy, a form of reproduction involving gametes similar in size, could explain the evolution of multiple...

Data from: Sentinel cells, symbiotic bacteria, and toxin resistance in the social amoeba Dictyostelium discoideum

Debra A. Brock, William Éamon Callison, Joan E. Strassmann & David C. Queller
The social amoeba Dictyostelium discoideum is unusual among eukaryotes in having both unicellular and multicellular stages. In the multicellular stage, some cells, called sentinels, ingest toxins, waste, and bacteria. The sentinel cells ultimately fall away from the back of the migrating slug, thus removing these substances from the slug. However, some D. discoideum clones called farmers carry commensal bacteria through the multicellular stage while others called non-farmers do not. Farmers profit from their beneficial bacteria....

Data from: Genome-wide association study in Arabidopsis thaliana of natural variation in seed oil melting point, a widespread adaptive trait in plants

Sandra E. Branham, Sara J. Wright, Aaron Reba, Ginnie D. Morrison & C. Randal Linder
Seed oil melting point is an adaptive, quantitative trait determined by the relative proportions of the fatty acids that compose the oil. Micro- and macro-evolutionary evidence suggests selection has changed the melting point of seed oils to covary with germination temperatures because of a trade-off between total energy stores and the rate of energy acquisition during germination under competition. The seed oil compositions of 391 natural accessions of Arabidopsis thaliana, grown under common-garden conditions, were...

Data from: Preoperative falls predict postoperative falls and other adverse patient-reported outcomes

Vanessa L. Kronzer, Michelle R. Jerry, Arbi Ben Abdallah, Troy S. Wildes, Susan L. Stark, Sherry L. McKinnon, Daniel L. Helsten, Anshuman Sharma & Michael S. Avidan
BACKGROUND: Falls are common and linked to morbidity. Our objectives were to characterize postoperative falls, and determine whether preoperative falls independently predicted postoperative falls (primary outcome), functional dependence, quality of life, complications, and readmission. METHODS: This prospective cohort study included 7982 unselected patients undergoing elective surgery. Data were collected from the medical record, a baseline survey, and follow-up surveys approximately 30days and one year after surgery. RESULTS: Fall rates (per 100 person-years) peaked at 175...

Data from: Ecological speciation of bacteriophage lambda in allopatry and sympatry

Justin R. Meyer, Devin T. Dobias, Sarah J. Medina, Lisa Servilio, Animesh Gupta & Richard E. Lenski
Understanding the conditions that allow speciation to occur is difficult because most research has focused on either long-lived organisms or asexual microorganisms. We propagated bacteriophage λ, a virus with rapid generations and frequent recombination, on two Escherichia coli host genotypes that expressed either the LamB or OmpF receptor. When supplied with either single host (allopatry), λ improved its binding to the available receptor while losing its ability to use the alternative. When evolving on both...

Data from: Detection of transient synchrony across oscillating receptors by the central electrosensory system of mormyrid fish

Alejandro Vélez & Bruce A. Carlson
Recently, we reported evidence for a novel mechanism of peripheral sensory coding based on oscillatory synchrony. Spontaneously oscillating electroreceptors in weakly electric fish (Mormyridae) respond to electrosensory stimuli with a phase reset that results in transient synchrony across the receptor population (Baker et al., 2015). Here, we asked whether the central electrosensory system actually detects the occurrence of synchronous oscillations among receptors. We found that electrosensory stimulation elicited evoked potentials in the midbrain exterolateral nucleus...

Data from: Optimizing the detection of wakeful and sleep-like states for future electrocorticographic brain computer interface applications

Mrinal Pahwa, Matthew Kusner, Carl D. Hacker, David T. Bundy, Kilian Q. Weinberger & Eric C. Leuthardt
Previous studies suggest stable and robust control of a brain-computer interface (BCI) can be achieved using electrocorticography (ECoG). Translation of this technology from the laboratory to the real world requires additional methods that allow users operate their ECoG-based BCI autonomously. In such an environment, users must be able to perform all tasks currently performed by the experimenter, including manually switching the BCI system on/off. Although a simple task, it can be challenging for target users...

Data from: Gα and regulator of G-protein signaling (RGS) protein pairs maintain functional compatibility and conserved interaction interfaces throughout evolution despite frequent loss of RGS proteins in plants

Dieter Hackenberg, Michael McKain, Soon-Goo Lee, Swarup Roy Choudhury, Tyler McCann, Spencer Schreier, Alex Harkess, J. Chris Pires, Gane Ka-Shu Wong, Joseph Jez, Elizabeth Kellogg, Sona Pandey, Soon Goo Lee, Joseph M. Jez, Michael R. McKain & Elizabeth A. Kellogg
Signaling pathways regulated by heterotrimeric G-proteins exist in all eukaryotes. The regulator of G-protein signaling (RGS) proteins are key interactors and critical modulators of the Gα protein of the heterotrimer. However, while G-proteins are widespread in plants, RGS proteins have been reported to be missing from the entire monocot lineage, with two exceptions. A single amino acid substitution-based adaptive coevolution of the Gα:RGS proteins was proposed to enable the loss of RGS in monocots. We...

Data from: Comparison of cerebral blood volume and plasma volume in untreated intracranial tumors

Soha Bazyar, Joana Ramalho, Cihat Eldeniz, Hongyu An, Yueh Lee & Yueh Z. Lee
Purpose: Plasma volume and blood volume are imaging-derived parameters that are often used to evaluation intracranial tumors. Physiologically, these parameters are directly related, but their two different methods of measurements, T1-dynamic contrast enhanced (DCE)- and T2-dynamic susceptibility contrast (DSC)-MR utilize different model assumptions and approaches. This poses the question of whether the interchangeable use of T1-DCE-MRI derived fractionated plasma volume (vp) and relative cerebral blood volume (rCBV) assessed using DSC-MRI, particularly in glioblastoma, is reliable,...

Data from: Genetic basis for red coloration in birds

Ricardo J Lopes, James D Johnson, Matthew B Toomey, Mafalda S Ferreira, Pedro M Araújo, José Melo-Ferreira, Leif Andersson, Geoffrey E Hill, Joseph C Corbo & Miguel Carneiro
The yellow and red feather pigmentation of many bird species [1] plays pivotal roles in social signaling and mate choice [2, 3]. To produce red pigments, birds ingest yellow carotenoids and endogenously convert them into red ketocarotenoids via an oxidation reaction catalyzed by a previously unknown ketolase [4–6]. We investigated the genetic basis for red coloration in birds using whole-genome sequencing of red siskins (Spinus cucullata), common canaries (Serinus canaria), and ‘‘red factor’’ canaries, which...

Data from: Stronger effect of gastropods than rodents on seedling establishment, irrespective of exotic or native plant species origin

Lotte Korell, Claudia Stein, Isabell Hensen, Helge Bruelheide, Katharine N. Suding & Harald Auge
Experimental evidence about how generalist consumers affect exotic plant invasions is equivocal, but most tests have been limited to few plant species, single herbivore guilds, and single locations. Using a seed-addition experiment, we studied effects of gastropods and rodents on recruitment success of 37 exotic and 37 native plant species affiliated to three different functional groups (i.e. grasses, legumes and non-legume herbs). We replicated our seed addition x herbivore exclusion experiment at multiple grassland sites,...

Data from: How many more? Sample size determination in studies of morphological integration and evolvability

Mark Grabowski & Arthur Porto
The variational properties of living organisms are an important component of current evolutionary theory. As a consequence, researchers working on the field of multivariate evolution have increasingly used integration and evolvability statistics as a way of capturing the potentially complex patterns of trait association and their effects over evolutionary trajectories. Little attention has been paid, however, to the cascading effects that inaccurate estimates of trait covariance have on these widely used evolutionary statistics. Here, we...

Data from: Fine-scale spatial ecology drives kin selection relatedness among cooperating amoebae

Jeff Smith, Joan E. Strassmann & David C. Queller
Cooperation among microbes is important for traits as diverse as antibiotic resistance, pathogen virulence, and sporulation. The evolutionary stability of cooperation against “cheater” mutants depends critically on the extent to which microbes interact with genetically similar individuals. The causes of this genetic social structure in natural microbial systems, however, are unknown. Here we show that social structure among cooperative Dictyostelium amoebae is driven by the population ecology of colonization, growth, and dispersal acting at spatial...

Data from: Comprehensive identification and clustering of CLV3/ESR-related (CLE) genes in plants finds groups with potentially shared function

David M. Goad, Chuanmei Zhu & Elizabeth A. Kellogg
CLV3/ESR (CLE) proteins are important signaling peptides in plants. The short CLE peptide (12–13 amino acids) is cleaved from a larger pre-propeptide and functions as an extracellular ligand. The CLE family is large and has resisted attempts at classification because the CLE domain is too short for reliable phylogenetic analysis and the pre-propeptide is too variable. We used a model-based search for CLE domains from 57 plant genomes and used the entire pre-propeptide for comprehensive...

Data from: Presence of a loner strain maintains cooperation and diversity in well-mixed bacterial communities

R. Fredrik Inglis, Jay M. Biernaskie, Andy Gardner & Rolf Kümmerli
Cooperation and diversity abound in nature despite cooperators risking exploitation from defectors and superior competitors displacing weaker ones. Understanding the persistence of cooperation and diversity is therefore a major problem for evolutionary ecology, especially in the context of well-mixed populations, where the potential for exploitation and displacement is greatest. Here, we demonstrate that a ‘loner effect’, described by economic game theorists, can maintain cooperation and diversity in real-world biological settings. We use mathematical models of...

Data from: Little white lies: pericarp color provides insights into the origins and evolution of Southeast Asian weedy rice

Yongxia Cui, Beng Kah Song, Lin-Feng Li, Ya-Ling Li, Zhongyun Huang, Ana L. Caicedo, Yulin Jia & Kenneth M. Olsen
Weedy rice is a conspecific form of cultivated rice (Oryza sativa L.) that infests rice fields and results in severe crop losses. Weed strains in different world regions appear to have originated multiple times from different domesticated and/or wild rice progenitors. In the case of Malaysian weedy rice, a multiple-origin model has been proposed based on neutral markers and analyses of domestication genes for hull color and seed shattering. Here we examined variation in pericarp...

Registration Year

  • 2016
    16

Resource Types

  • Dataset
    16

Affiliations

  • Washington University in St. Louis
    16
  • Donald Danforth Plant Science Center
    2
  • Agricultural Research Service
    2
  • University of Missouri
    2
  • Helmholtz Centre for Environmental Research
    1
  • Institute of Biology
    1
  • University of Massachusetts Amherst
    1
  • The University of Texas at Austin
    1
  • University of Michigan-Ann Arbor
    1
  • Centro Hospitalar de Lisboa Central
    1