193 Works

Combining GWAS and FST-based approaches to identify targets of Borrelia-mediated selection in natural rodent hosts

Luca Cornetti & Barbara Tschirren
Recent advances in high-throughput sequencing technologies provide opportunities to gain novel insights into the genetic basis of phenotypic trait variation. Yet to date, progress in our understanding of genotype-phenotype associations in non-model organisms in general and natural vertebrate populations in particular has been hampered by small sample sizes typically available for wildlife populations and a resulting lack of statistical power, as well as a limited ability to control for false positive signals. Here we propose...

Comparative data for dance fly eye morphology and female ornamentation

R. Axel W. Wiberg, Rosalind L Murray, Elizabeth Herridge, Darryl T Gwynne & Luc F Bussière
These data were collected as part of a comparative study of the relationship between female ornamentation and sexual dimorphism in eye morphology. Data come from specimens collected in the field in Scotland near Loch Lomond in the summers of 2009, 2010, and 2011 as well as the summer of 2012 near Glen Williams in Ontario, Canada. The repository contains raw image files including information on magnifications at which these were taken, excel spreadsheets of morphological...

Data from: Expressed mutational load increases towards the edge of a species’ geographic range

Antoine Perrier, Dario Sanchez-Castro & Yvonne Willi
There is no general explanation for why species have restricted geographic distributions. One hypothesis posits that range expansion or increasing scarcity of suitable habitat result in accumulation of mutational load due to enhanced genetic drift, which constrains population performance towards range limits and further expansion. We tested this hypothesis in the North American plant, Arabidopsis lyrata. We experimentally assessed mutational load by crossing plants of 20 populations from across the entire species range and by...

Gene expression remodelling and immune response during adaptive divergence in an African cichlid fish

Jelena Rajkov, Athimed El Taher, Astrid Böhne, Walter Salzburger & Bernd Egger
Variation in gene expression contributes to ecological speciation by facilitating population persistence in novel environments. Likewise, immune response can be a relevant factor in speciation driven by adaptation to different environments. Previous studies examining gene expression differences between recently diverged ecotypes often relied on only one pair of populations, targeted the expression of only a subset of genes, or used wild caught-individuals. Here, we investigated the contribution of habitat-specific parasites and symbionts and the underlying...

Data from: The repeatable opportunity for selection differs between pre- and post-copulatory fitness components

Lucas Marie-Orleach, Nikolas Vellnow & Lukas Schärer
In species with multiple mating, intense sexual selection may occur both before and after copulation. However, comparing the strength of pre- and postcopulatory selection is challenging, because i) postcopulatory processes are generally difficult to observe and ii) the often-used opportunity for selection (I) metric contains both deterministic and stochastic components. Here, we quantified pre- and postcopulatory male fitness components of the simultaneously hermaphroditic flatworm, Macrostomum lignano. We did this by tracking fluorescent sperm—using transgenics—through the...

A model of digestive tooth corrosion in lizards: experimental tests and taphonomic implications

Krister T. Smith, Orr Comay, Lutz Maul, Fabio Wegmüller, Jean-Marie Le Tensorer & Tamar Dayan
Abstract Corrosion patterns induced by gastric fluids on the skeleton of prey animals may depend on the nature of the corrosive agents (acid, enzymes) as well as on the composition of the hard parts and the soft tissues that surround them. We propose a framework for predicting and interpreting corrosion patterns on lizard teeth, our model system, drawing on the different digestive pathways of avian and non-avian vertebrate predators. We propose that high-acid, low-enzyme systems...

Task-induced modulations of neuronal activity along the auditory pathway

Gioia De Franceschi & Tania R. Barkat
Sensory processing varies depending on behavioral context. Here, we ask how task-engagement modulates neurons in the auditory system. We train mice in a simple tone-detection task, and compare their neuronal activity during passive hearing and active listening. Electrophysiological extracellular recordings in the inferior colliculus, medial geniculate body, primary auditory cortex and anterior auditory field reveals widespread modulations across all regions and cortical layers, and in both putative regular and fast-spiking cortical neurons. Clustering analysis unveils...

The implications of incongruence between gene tree and species tree topologies for divergence time estimation

Tom Carruthers, Miao Sun, William Baker, Stephen Smith, Jurriaan De Vos & Wolf Eiserhardt
Phylogenetic analyses are increasingly being performed with datasets that incorporate hundreds of loci. Due to incomplete lineage sorting, hybridization, and horizontal gene transfer, the gene trees for these loci may often have topologies that differ from each other and from the species tree. The effect of these topological incongruences on divergence time estimation has not been fully investigated. Using a series of simulation experiments and empirical analyses, we demonstrate that when topological incongruence between gene...

The EDA receptor (EDAR) is a candidate gene for lateral plate number variation in stickleback fish

Telma G. Laurentino, Nicolas Boileau, Fabrizia Ronco & Daniel Berner
Variation in lateral plating in stickleback fish represents a classical example of rapid and parallel adaptation in morphology. The underlying genetic architecture involves polymorphism at the ectodysplasin-A (EDA) gene. However, lateral plate number is influenced by additional loci that remain poorly characterized. Here we search for such loci by performing genome-wide differentiation mapping based on pooled whole-genome sequence data from a European stickleback population variable in the extent of lateral plating, while tightly controlling for...

Data from: Quantitative genetic inheritance of morphological divergence in a lake-stream stickleback ecotype pair: implications for reproductive isolation

Daniel Berner, Renaud Kaeuffer, Anne-Catherine Grandchamp, Joost A. M. Raeymaekers, Katja Räsänen & Andrew P. Hendry
Ecological selection against hybrids between populations occupying different habitats might be an important component of reproductive isolation during the initial stages of speciation. The strength and directionality of this barrier to gene flow depends on the genetic architecture underlying divergence in ecologically relevant phenotypes. We here present line cross analyses of inheritance for two key foraging-related morphological traits involved in adaptive divergence between stickleback ecotypes residing parapatrically in lake and stream habitats within the Misty...

Data from: Separated by sand, fused by dropping water: habitat barriers and fluctuating water levels steer the evolution of rock-dwelling cichlid populations in Lake Tanganyika

Stephan Koblmüller, Walter Salzburger, Beate Obermüller, Eva Eigner, Christian Sturmbauer & Kristina M Sefc
The conditions of phenotypic and genetic population differentiation allow inferences about the evolution, preservation and loss of biological diversity. In Lake Tanganyika, water level fluctuations are assumed to have had a major impact on the evolution of stenotopic littoral species, though this hypothesis has not been specifically examined so far. The present study investigates whether subtly differentiated color patterns of adjacent Tropheus moorii populations are maintained in isolation or in the face of continuous gene...

Data from: Multiple quantitative trait loci influence intra-specific variation in genital morphology between phylogenetically distinct lines of Drosophila montana

Martin A Schäfer, Jarkko Routtu, Jorge Vieira, Anneli Hoikkala, Mike G Ritchie & Christian Schlötterer
The evolution of animal genitalia has gained renewed interest, because of their potential roles during sexual selection and early stages of species formation. Although central to understanding the evolutionary process, knowledge of the genetic basis of natural variation in genital morphology is limited to a very few species. Using an out-bred cross between phylogenetically distinct lines of Drosophila montana, we characterized quantitative trait loci (QTLs) affecting the size and shape of the distiphallus, a prominent...

Data from: AFLP markers reveal high clonal diversity and extreme longevity in four arctic-alpine key species

Lucienne C. De Witte, Georg F.J. Armbruster, Ludovic Gielly, Pierre Taberlet & Jürg Stöcklin
We investigated the clonal diversity, genet size structure and genet longevity in populations of four arctic-alpine plants (Carex curvula, Dryas octopetala, Salix herbacea and Vaccinium uliginosum) in order to evaluate their persistence under past climatic oscillations and their potential resistance to future climate change. The size and number of genets was determined with molecular markers (AFLP) using a standardized sampling design in several homogenous climax populations across arctic-alpine regions in Europe. Genet age was estimated...

Data from: Plasticity of animal genome architecture unmasked by rapid evolution of a pelagic tunicate

France Denoeud, Simon Henriet, Sutada Mungpakdee, Jean-Marc Aury, Corinne Da Silva, Henner Brinkmann, Jana Mikhaleva, Lisbeth C. Olsen, Claire Jubin, Cristian Cañestro, Jean-Marie Bouquet, Gemma Danks, Julie Poulain, Coen Campsteijn, Marcin Adamski, Ismael Cross, Fekadu Yadetie, Matthieu Muffato, Alexandra Louis, Stephen Butcher, Georgia Tsagkogeorga, Anke Konrad, Sarabdeep Singh, Marit F. Jensen, Evelyne Huynh Cong … & Daniel Chourrout
Genomes of animals as different as sponges and humans show conservation of global architecture. Here we show that multiple genomic features including transposon diversity, developmental gene repertoire, physical gene order, and intron-exon organization are shattered in the tunicate Oikopleura, belonging to the sister group of vertebrates and retaining chordate morphology. Ancestral architecture of animal genomes can be deeply modified and may therefore be largely nonadaptive. This rapidly evolving animal lineage thus offers unique perspectives on...

Data from: Citizen science reveals unexpected continental-scale evolutionary change in a model organism

Jonathan Silvertown, Laurence Cook, Robert Cameron, Mike Dodd, Kevin McConway, Jenny Worthington, Peter Skelton, Christian Anton, Oliver Bossdorf, Bruno Baur, Menno Schilthuizen, Benoît Fontaine, Helmut Sattmann, Giorgio Bertorelle, Maria Correia, Cristina Oliveira, Beata Pokryszko, Małgorzata Ożgo, Arturs Stalažs, Eoin Gill, Üllar Rammul, Péter Sólymos, Zoltan Féher & Xavier Juan
Organisms provide some of the most sensitive indicators of climate change and evolutionary responses are becoming apparent in species with short generation times. Large datasets on genetic polymorphism that can provide an historical benchmark against which to test for recent evolutionary responses are very rare, but an exception is found in the brown-lipped banded snail (Cepaea nemoralis). This species is sensitive to its thermal environment and exhibits several polymorphisms of shell colour and banding pattern...

Data from: Resistance to a bacterial parasite in the Crustacean Daphnia magna shows Mendelian segregation with dominance

Pepijn Luijckx, Harris Fienberg, David Duneau, Dieter Ebert & P Luijckx
The influence of host and parasite genetic background on infection outcome is a topic of great interest because of its pertinence to theoretical issues in evolutionary biology. In the present study we use a classical genetics approach to examine the mode of inheritance of infection outcome in the crustacean Daphnia magna when exposed to the bacterial parasite Pasteuria ramosa. In contrast to previous studies in this system we use a clone of P. ramosa, not...

Data from: Constraints on speciation suggested by comparing lake-stream stickleback divergence across two continents

Daniel Berner, Marius Roesti, Andrew P. Hendry & Walter Salzburger
Adaptation to ecologically distinct environments can coincide with the emergence of reproductive barriers. The outcome of this process is highly variable and can range along a continuum from weak population differentiation all the way to complete, genome-wide divergence. The factors determining how far diverging taxa will move along this continuum remain poorly understood but are most profitably investigated in taxa under replicate divergence. Here we explore determinants of progress toward speciation by comparing phenotypic and...

Data from: Gene flow by larval dispersal in the Antarctic notothenioid fish Gobionotothen gibberifrons

Michael Matschiner, Reinhold Hanel & Walter Salzburger
The diversification of the teleost suborder Notothenioidei (Perciformes) in Antarctic waters provides one of the most striking examples of a marine adaptive radiation. Along with a number of adaptations to the cold environment, such as the evolution of antifreeze glycoproteins, notothenioids diversified into eight families and at least 130 species. Here, we investigate the genetic population structure of the humped rockcod (Gobionotothen gibberifrons), a benthic notothenioid fish. Six populations were sampled at different locations around...

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