10 Works

Data from: Rapid evolution of antioxidant defense in a natural population of Daphnia magna

Sarah Oexle, Mieke Jansen, Kevin Pauwels, Ruben Sommaruga, Luc De Meester & Robby Stoks
Natural populations can cope with rapid changes in stressors by relying on sets of physiological defense mechanisms. Little is known onto what extent these physiological responses reflect plasticity and/or genetic adaptation, evolve in the same direction and result in an increased defense ability. Using resurrection ecology, we studied how a natural Daphnia magna population adjusted its antioxidant defense to ultraviolet radiation (UVR) during a period with increasing incident UVR reaching the water surface. We demonstrate...

Data from: A novel method to infer the origin of polyploids from AFLP data reveals that the Alpine polyploid complex of Senecio carniolicus (Asteraceae) evolved mainly via autopolyploidy

Manuela Winkler, Pedro Escobar García, Andreas Gattringer, Michaela Sonnleitner, Karl Hülber, Peter Schönswetter & Gerald M. Schneeweiss
Despite its evolutionary and ecological relevance the mode of polyploid origin has been notoriously difficult to be reconstructed from molecular data. Here, we present a method to identify the putative parents of polyploids and thus to infer the mode of their origin (auto- versus allopolyploidy) from Amplified Fragment Length Polymorphism (AFLP) data. To this end, we use Cohen's d of distances between in silico polyploids, generated within a priori defined scenarios of origin from a...

Data from: Morphological and taxonomic demarcation of Brachionus asplanchnoidis Charin within the Brachionus plicatilis cryptic species complex (Rotifera, Monogononta)

Evangelia Michaloudi, Scott Mills, Spiros Papakostas, Claus-Peter Stelzer, Alexander Triantafyllidis, Ilias Kappas, Kalliopi Vasileiadou, Konstantinos Proios & Theodore John Abatzopoulos
Three well-defined groups, consisting of 15 species, have recently been ascribed to organisms historically identified as the Brachionus plicatilis species complex. One of these groups, the Large-clade is composed of two named species (Brachionus plicatilis s.s. and Brachionus manjavacas) and two species identifiers (B. 'Nevada' and B. 'Austria'). B. 'Austria' has been confirmed to be B. asplanchnoidis. As no type specimen exists for this species, and the original taxonomic description is lacking in detail, we...

Data from: Standing chromosomal variation in Lake Whitefish species pairs: the role of historical contingency and relevance for speciation

Anne-Marie Dion-Côté, Radka Symonová, Fabien C. Lamaze, Šárka Pelikánová, Petr Ráb & Louis Bernatchez
The role of chromosome changes in speciation remains a debated topic, although demographic conditions associated with divergence should promote their appearance. We tested a potential relationship between chromosome changes and speciation by studying two Lake Whitefish (Coregonus clupeaformis) lineages that recently colonized postglacial lakes following allopatry. A dwarf limnetic species evolved repeatedly from the normal benthic species, becoming reproductively isolated. Lake Whitefish hybrids experience mitotic and meiotic instability, which may result from structurally divergent chromosomes....

Data from: BsRADseq: screening DNA methylation in natural populations of non-model species

Emiliano Trucchi, Anna B. Mazzarella, Gregor D. Gilfillan, Maria T. Lorenzo, Peter Schönswetter & Ovidiu Paun
Epigenetic modifications are expected to occur at a much faster rate than genetic mutations, potentially causing isolated populations to stochastically drift apart, or if they are subjected to different selective regimes, to directionally diverge. A high level of genome-wide epigenetic divergence between individuals occupying distinct habitats is therefore predicted. Here, we introduce bisulfite-converted restriction site associated DNA sequencing (bsRADseq), an approach to quantify the level of DNA methylation differentiation across multiple individuals. This reduced representation...

Data from: Heteroploid Knautia drymeia (Caprifoliaceae) includes K. gussonei and cannot be separated into diagnosable subspecies

Ivana Rešetnik, Božo Frajman & Peter Schönswetter
Premise of the study: Knautia drymeia is a morphologically variable, diploid and tetraploid temperate forest understory species distributed in southeastern Europe and adjacent areas. The species is an excellent system to explore the influence of polypoidy on taxonomic delineations, the role of hybridization among genetically distant populations in polyploid evolution, as well as the impact of glacial refugia on the evolution of polyploids. Methods: Amplified fragment length polymorphism fingerprinting and multivariate analyses of morphological characters...

Data from: The hitchhiker's guide to Europe: the infection dynamics of an ongoing Wolbachia invasion and mitochondrial selective sweep in Rhagoletis cerasi

Hannes Schuler, Kirsten Koeppler, Sabine Daxböck-Horvath, Bilal Rasool, Susanne Krumboeck, Dietmar Schwarz, Thomas Hoffmeister, Birgit Schlick-Steiner, Florian Steiner, Arndt Telschow, Christian Stauffer, Wolfgang Arthofer, Markus Riegler, Birgit C. Schlick-Steiner, Florian M. Steiner & Thomas S. Hoffmeister
Wolbachia is a maternally inherited and ubiquitous endosymbiont of insects. It can hijack host reproduction by manipulations such as cytoplasmic incompatibility (CI) to enhance vertical transmission. Horizontal transmission of Wolbachia can also result in the colonization of new mitochondrial lineages. In this study, we present a 15-year-long survey of Wolbachia in the cherry fruit fly Rhagoletis cerasi across Europe and the spatiotemporal distribution of two prevalent strains, wCer1 and wCer2, and associated mitochondrial haplotypes in...

Data from: Glacial refugia, recolonisation patterns, and diversification forces in Alpine-endemic Megabunus harvestmen

Gregor A. Wachter, Anna Papadopoulou, Christoph Muster, Wolfgang Arthofer, L. Lacey Knowles, Florian M. Steiner & Birgit C. Schlick-Steiner
The Pleistocene climatic fluctuations had a huge impact on all life-forms, and various hypotheses regarding the survival of organisms during glacial periods have been postulated. In the European Alps, evidence has been found in support of refugia outside the ice shield (massifs de refuge) acting as sources for postglacial recolonisation of inner-Alpine areas. In contrast, evidence for survival on nunataks, ice-free areas above the glacier, remains scarce. Here, we combine multivariate genetic analyses with ecological...

Data from: Environment not dispersal limitation drives clonal composition of arctic Daphnia in a recently deglaciated area

Tsegazeabe Hadush Haileselasie, Joachim Mergeay, Lawrence J. Weider, Ruben Sommaruga, Thomas A. Davidson, Mariana Meerhoff, Hartmut Arndt, Klaus Jürgens, Erik Jeppesen & Luc De Meester
One of the most prominent manifestations of the ongoing climate warming is the retreat of glaciers and ice sheets around the world. Retreating glaciers result in the formation of new ponds and lakes, which are available for colonization. The gradual appearance of these new habitat patches allows us to determine to what extent the composition of asexual Daphnia (water flea) populations is affected by environmental drivers versus dispersal limitation. Here we used a landscape genetics...

Data from: Drought history affects grassland plant and microbial carbon turnover during and after a subsequent drought event

Lucia Fuchslueger, Michael Bahn, Roland Hasibeder, Sandra Kienzl, Karina Fritz, Michael Schmitt, Margarete Watzka & Andreas Richter
Drought periods are projected to become more severe and more frequent in many European regions. While effects of single strong droughts on plant and microbial carbon (C) dynamics have been studied in some detail, impacts of recurrent drought events are still little understood. We tested whether the legacy of extreme experimental drought affects responses of plant and microbial C and nitrogen (N) turnover to further drought and rewetting. In a mountain grassland we conducted a...

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  • University of Innsbruck
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  • Research Institute for Nature and Forest
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  • Oslo University Hospital
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  • University of Michigan-Ann Arbor
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