59 Works

Alternative reproductive tactic in male Drosophila prolongata

Jhoniel Perdigón Ferreira & Stefan Lüpold
Species with intense male-male competition for access to females often show alternative reproductive tactics (ARTs) where males of lower competitive ability adopt a sneaky behavior to gain access to mates. These ARTs are usually associated with intrasexual dimorphisms, in that males with distinct morphologies show different tactics. In some cases, however, males adopt different tactics without being dimorphic. Male Drosophila prolongata exhibit continuous variation in body size and shape, with enlarged forelegs that they use...

Accompanied versus unaccompanied walking for continuous oxygen saturation measurement during 6-min walk test in COPD: A randomised cross-over study

Thomas F. Riegler, Anja Frei, Sarah R. Haile & Thomas Radtke
Is there is a difference in the 6-Minute Walk Test (6MWT) distance when the assessor accompanies the patient to continuously measure oxygen saturation (SpO2) compared to the patient walking unaccompanied? We conducted a randomised cross-over study to evaluate the impact of the assessor walking with the patient during 6MWT (6MWTwith) versus patient walking alone (6MWTwithout). At the end of a pulmonary rehabilitation programme, each patient performed two 6MWTs in random order and separated by 30...

Recent activity in expanding populations and purifying selection have shaped transposable element landscapes across natural accessions of the Mediterranean grass Brachypodium distachyon

Christoph Stritt, Sean P Gordon, Thomas Wicker, John P Vogel & Anne C Roulin
Transposable element (TE) activity has emerged as a major cause of variation in genome size and structure among species. To what extent TEs contribute to genetic variation and divergence within species, however, is much less clear, mainly because population genomic data have so far only been available for the classical model organisms. In this study, we use the annual Mediterranean grass Brachypodium distachyon to investigate TE dynamics in natural populations. Using whole-genome sequencing data for...

Cooperation-based concept formation in male bottlenose dolphins

Stephanie King, Richard Connor, Michael Krützen & Simon Allen
In Shark Bay, Western Australia, male bottlenose dolphins form a complex nested alliance hierarchy. At the first level, pairs or trios of unrelated males cooperate to herd single females. Multiple first-order alliances cooperate in teams (second-order alliances) in the pursuit and defense of females, and multiple teams also work together (third-order alliances). Yet it remains unknown how dolphins classify these nested alliance relationships. We used 30 years of behavioural data combined with 40 contemporary sound...

A liposome assay showing the absence of scrambling in TTYH proteins and a lipidomics analysis of TTYH2

Anastasiia Sukalskaia & Raimund Dutzler
The Tweety homologues (TTYHs) are members of a conserved family of eukaryotic membrane proteins that are abundant in the brain. The three human paralogs were assigned to function as anion channels that are either activated by Ca2+ or cell swelling. To uncover their unknown architecture and its relationship to function, we have determined the structures of human TTYH1–3 by cryo-electron microscopy. All structures display equivalent features of a dimeric membrane protein that contains five transmembrane...

Ecology drives the evolution of diverse social strategies in Pseudomonas aeruginosa

Alexandre Figueiredo, Andreas Wagner & Rolf Kümmerli
Bacteria often cooperate by secreting molecules that can be shared as public goods between cells. Because the production of public goods is subject to cheating by mutants that exploit the good without contributing to it, there has been great interest in elucidating the evolutionary forces that maintain cooperation. However, little is known on how bacterial cooperation evolves under conditions where cheating is unlikely of importance. Here we use experimental evolution to follow changes in the...

Different molecular changes underlie the same phenotypic transition: Origins and consequences of independent shifts to homostyly within species

Emiliano Mora Carrera
The repeated transition from outcrossing to selfing is a key topic in evolutionary biology. However, the molecular basis of such shifts has been rarely examined due to lack of knowledge of the genes controlling these transitions. A classic example of mating system transition is the repeated shift from heterostyly to homostyly. Occurring in 28 angiosperm families, heterostyly is characterized by the reciprocal position of male and female sexual organs in two (or three) distinct, usually...

African wild dog access to kills

Neil Jordan, Krystyna Golabek, Dominik Behr, Reena Walker, Laura Plimpton, Samantha Lostrom, Megan Claase, Leanne Van Der Weyde & J. Weldon McNutt
Patterns of food sharing in collectively hunting species are likely to influence social dynamics and evolution. Despite this, little is known about competition within social groups at carcasses and other food sources, making the social drivers and implications of food sharing difficult to assess. We quantified carcass access and feeding behavior in free-ranging African wild dogs, Lycaon pictus, at natural kill sites, confirming and quantifying previous descriptions of a youngest-feed-first system. Using data on feeding...

Simulation Data from: The EOS/Resolution Conspiracy: Convergence in Proto-Planetary Collision Simulations

Thomas Meier, Christian Reinhardt & Joachim Stadel
We investigate how the choice of equation of state (EOS) and resolution conspire to affect the outcomes of giant impact (GI) simulations. We focus on the simple case of equal mass collisions of two Earth-like 0.5ME proto-planets showing that the choice of EOS has a profound impact on the outcome of such collisions as well as on the numerical convergence with resolution. In simulations where the Tillotson EOS is used, impacts generate an excess amount...

Data from: Condition-dependent interaction between mating success and competitive fertilization success in Drosophila melanogaster

Alessio N. De Nardo, Jeannine Roy, Sonja H. Sbilordo & Stefan Lüpold
Dietary restriction during development can affect adult body size and condition. In many species, larger (high-condition) males gain higher mating success through male-male competition and female choice, and female condition can affect the extent of both female mate choice and male investment in courtship or ejaculates. However, few studies have examined the joint effects and interplay of male and female condition during both the pre- and the post-copulatory phases of sexual selection. We therefore manipulated...

Electrophysiological recordings and a liposome-based assay showing the absence of chloride and proton conduction in TTYH proteins

Anastasiia Sukalskaia & Raimund Dutzler
The Tweety homologues (TTYHs) are members of a conserved family of eukaryotic membrane proteins that are abundant in the brain. The three human paralogs were assigned to function as anion channels that are either activated by Ca2+ or cell swelling. To uncover their unknown architecture and its relationship to function, we have determined the structures of human TTYH1–3 by cryo-electron microscopy. All structures display equivalent features of a dimeric membrane protein that contains five transmembrane...

Adaptation and competition in deteriorating environments

Romana Limberger & Gregor Fussmann
Evolution might rescue populations from extinction in changing environments. Using experimental evolution with microalgae, we investigated if competition influences adaptation to an abiotic stressor, and vice versa, if adaptation to abiotic change influences competition. In a first set of experiments, we propagated monocultures of five species with and without increasing salt stress for ~180 generations. When assayed in monoculture, two of the five species showed signatures of adaptation, that is, lines with a history of...

Sociability increases survival of adult female giraffes

Monica Bond, Derek Lee, Damien Farine, Arpat Ozgul & Barbara Koenig
Studies increasingly show that social connectedness plays a key role in determining survival, in addition to natural and anthropogenic environmental factors. Few studies, however, integrated social, non-social, and demographic data to elucidate what components of an animal’s socio-ecological environment are most important to their survival. Female giraffes (Giraffa camelopardalis) form structured societies with highly dynamic group membership but stable long-term associations. We examined the relative contributions of sociability (relationship strength, gregariousness, and betweenness), together with...

Structural heterogeneity of cellular K5/K14 filaments as revealed by cryo-electron microscopy

Miriam Sarah Weber, Matthias Eibauer, Suganya Sivagurunathan, Thomas Magin, Robert Goldman & Ohad Medalia
Keratin intermediate filaments are an essential and major component of the cytoskeleton in epithelial cells. They form a stable yet dynamic filamentous network extending from the nucleus to the cell periphery, which provides resistance to mechanical stresses. Mutations in keratin genes are related to a variety of epithelial tissue diseases. Despite their importance, the molecular structure of keratin filaments remains largely unknown. In this study, we analyzed the structure of keratin 5/keratin 14 filaments within...

Cheating in mutualisms

Daniel Wechsler & Jordi Bascompte
Mutualisms such as those between flowering plants and their pollinators are common in nature. Yet, understanding their persistence in the face of cheaters and identifying the mechanisms behind their stunning diversity provide formidable challenges for evolutionary biologists. To shed light into these questions, we introduce an individual-based model of two coevolving species in which individuals of one species use a Boolean circuit to discriminate between cooperators and cheaters in the other species. This conveys the...

Data from: Selection on growth rate and local adaptation drive genomic adaptation during experimental range expansions in the protist Tetrahymena thermophila

Felix Moerman, Emanuel Fronhofer, Florian Altermatt & Andreas Wagner
1. Populations that expand their range can undergo rapid evolutionary adaptation of life-history traits, dispersal behaviour, and adaptation to the local environment. Such adaptation may be aided or hindered by sexual reproduction, depending on the context. 2. However, few empirical and experimental studies have investigated the genetic basis of adaptive evolution during range expansions. Even less attention has been given to the question how sexual reproduction may modulate such adaptive evolution during range expansions. 3....

Data for: Are immigrants outbred and unrelated? Testing standard assumptions in a wild metapopulation

Lisa Dickel, Peter Arcese, Pirmin Nietlisbach, Lukas Keller & Jane Reid
Immigration into small recipient populations is expected to alleviate inbreeding and increase genetic variation, and hence facilitate population persistence through genetic and/or evolutionary rescue. Such expectations depend on three standard assumptions: that immigrants are outbred, unrelated to existing natives at arrival, and unrelated to each other. These assumptions are rarely explicitly verified, including in key field systems in evolutionary ecology. Yet, they could be violated due to non-random or repeated immigration from adjacent small populations....

Community-wide trait means and variations affect biomass in a biodiversity experiment with tree seedlings

Shan Luo, Bernhard Schmid, Cameron Wagg, Yuxin Chen, Bin Jiang, Minxia Liang, Xubing Liu & Shixiao Yu
The structure of a plant community in terms of functional traits can strongly affect community productivity. Two components may contribute to this, community-wide trait means (mass-ratio hypothesis) or community-wide trait variations (diversity hypothesis) across species and individuals. We compared the explanatory power of the two hypotheses for explaining biomass variation among individuals and communities as measures of productivity. We set up experimental communities of tree seedlings that ranged in species richness from 1‒8. We measured...

Diversity of response and effect traits provides complementary information about avian community dynamics linked to ecological function

Lisbeth Hordley, Simon Gillings, Owen Petchey, Joseph Tobias, Thomas Oliver, Lisbeth A. Hordley, Owen L. Petchey, Joseph A. Tobias & Thomas H. Oliver
Functional diversity metrics based on species traits are widely used to investigate ecosystem functioning. In theory, such metrics have different implications depending on whether they are calculated from traits mediating responses to environmental change (response traits) or those regulating function (effect traits), yet trait choice in diversity metrics is rarely scrutinized. Here, we compile effect and response traits for British bird species supplying two key ecological services – seed dispersal and insect predation – to...

Data to Prior exposure to stress allows the maintenance of an ecosystem cycle following severe acidification

Sofia Van Moorsel, Justin Marleau, Andrew Gonzalez, Owen Petchey, Charles Bazerghi & Jorge Negrin Dastis
This freshwater mesocosm study was conducted in 19 out of 110 mesocosms at the Large Experimental Array of Ponds (LEAP) at the Gault Nature Reserve in Mont-St-Hilaire, QC, Canada (45°32' N, 73°08' W, 122 m a.s.l.) between May and October 2018 for a total of 147 days. On 24 May 2018, the mesocosms (1100L stock tanks, Rubbermaid, Huntersville, NC, USA) were filled with approximately 1000 liters of unfiltered lake water via a pipeline from oligotrophic...

Data for: Immobilization of molecular catalysts on electrode surfaces using host–guest interactions

S. David Tilley, Laurent Sévery, Jacek Szczerbiński, Mert Taskin, Isik Tuncay, Fernanda Nunes, Chiara Cignarella, Gabriele Tocci, Olivier Blacque, Juerg Osterwalder, Renato Zenobi & Marcella Iannuzzi
Anchoring molecular catalysts on electrode surfaces combines the high selectivity and activity of molecular systems with the practicality of heterogeneous systems. Molecular catalysts, however, are far less stable than traditional heterogeneous electrocatalysts, and therefore a method to easily replace anchored molecular catalysts that have degraded could make such electrosynthetic systems more attractive. Here, we apply a non-covalent ‘click’ chemistry approach to reversibly bind molecular electrocatalysts to electrode surfaces through host–guest complexation with surface-anchored cyclodextrins. The...

Ecological causes of fluctuating natural selection on habitat choice in an amphibian

Joseph Van Buskirk & David C. Smith
We estimated natural selection targeting three traits related to habitat choice in a frog (Pseudacris maculata) breeding in pools on the rocky shores of Isle Royale, Michigan, over 16 years. Our aim was to identify the form and ecological causes of annual variation in directional and correlational selection as expressed in the survival and growth of tadpoles. We found directional selection favoring early breeding, but pool choice was under weak stabilizing selection. However, the form...

Data from: Collateral sensitivity interactions between antibiotics depend on local abiotic conditions

Richard Allen
Mutations conferring resistance to one antibiotic can increase (cross resistance) or decrease (collateral sensitivity) resistance to others. Antibiotic combinations displaying collateral sensitivity could be used in treatments that slow resistance evolution. However, lab-to-clinic translation requires understanding whether collateral effects are robust across different environmental conditions. Here, we isolated and characterized resistant mutants of Escherichia coli using five antibiotics, before measuring collateral effects on resistance to other paired antibiotics. During both isolation and phenotyping, we varied...

Decline and Fall: the causes of group failure in cooperatively breeding meerkats

Christopher Duncan, Marta Manser & Tim Clutton-Brock
In many social vertebrates, variation in group persistence exerts an important effect on individual fitness and population demography. However, few studies have been able to investigate the failure of groups or the causes of the variation in their longevity. We use data from a long-term study of cooperatively breeding meerkats, Suricata suricatta, to investigate the different causes of group failure and the factors that drive these processes. Many newly formed groups failed within a year...

Data from: Life-history responses of a freshwater rotifer to copper pollution

Federica R. Schanz, Stefan Sommer, Andrea Lami, Diego Fontaneto & Arpat Ozgul
In organisms with dormant stages, life-history responses to past pollution can be studied retrospectively. Here, we study such responses in a rotifer (Brachionus calyciflorus) from the once heavily copper-polluted Lake Orta (Italy). We extracted resting eggs from sediments, established clonal lineages from hatchlings, and exposed newborns of these lineages to one of three copper concentrations that each mimicked a specific period in the lake’s pollution history. For each rotifer, we daily collected life-table data. We...

Registration Year

  • 2021

Resource Types

  • Dataset


  • University of Zurich
  • Swiss Federal Institute of Technology in Zurich
  • University of Cambridge
  • Leipzig University
  • Swiss Federal Institute of Aquatic Science and Technology
  • McGill University
  • Swiss Ornithological Institute
  • University of Helsinki
  • Botswana Predator Conservation Trust
  • State University of Campinas