100 Works

Data from: Experimental illumination of a forest: no effects of lights of different colours on the onset of the dawn chorus in songbirds

Arnaud Da Silva, Maaike De Jong, Roy H. A. Van Grunsven, Marcel E. Visser, Bart Kempenaers & Kamiel Spoelstra
Light pollution is increasing exponentially, but its impact on animal behaviour is still poorly understood. For songbirds, the most repeatable finding is that artificial night lighting leads to an earlier daily onset of dawn singing. Most of these studies are, however, correlational and cannot entirely dissociate effects of light pollution from other effects of urbanization. In addition, there are no studies in which the effects of different light colours on singing have been tested. Here,...

Data from: Molecular phylogeny and timing of diversification in Alpine Rhithrogena (Ephemeroptera: Heptageniidae)

Laurent Vuataz, Sereina Rutschmann, Michael T. Monaghan & Michel Sartori
Background Larvae of the Holarctic mayfly genus Rhithrogena Eaton, 1881 (Ephemeroptera, Heptageniidae) are a diverse and abundant member of stream and river communities and are routinely used as bio-indicators of water quality. Rhithrogena is well diversified in the European Alps, with a number of locally endemic species, and several cryptic species have been recently detected. While several informal species groups are morphologically well defined, a lack of reliable characters for species identification considerably hampers their...

Data from: Metabarcoding and metabolome analyses of copepod grazing reveal feeding preference and linkage to metabolite classes in dynamic microbial plankton communities

Jessica L. Ray, Julia Althammer, Katrine S. Skaar, Paolo Simonelli, Aud Larsen, Diane Stoecker, Andrey Sazhin, Umer Z. Ijaz, Christopher Quince, Jens C. Nejstgaard, Marc Frischer, Georg Pohnert & Christofer Troedsson
In order to characterize copepod feeding in relation to microbial plankton community dynamics, we combined metabarcoding and metabolome analyses during a 22-day seawater mesocosm experiment. Nutrient amendment of mesocosms promoted the development of haptophyte (Phaeocystis pouchetii)- and diatom (Skeletonema marinoi)-dominated plankton communities in mesocosms, in which Calanus sp. copepods were incubated for 24 h in flow-through chambers to allow access to prey particles (<500 μm). Copepods and mesocosm water sampled six times spanning the experiment...

Data from: Altered trait variability in response to size-selective mortality

Silva Uusi-Heikkilä, Kai Lindström, Noora Parre, Robert Arlinghaus, Josep Alós & Anna Kuparinen
Changes in trait variability owing to size-selective harvesting have received little attention in comparison with changes in mean trait values, perhaps because of the expectation that phenotypic variability should generally be eroded by directional selection typical for fishing and hunting. We show, however, that directional selection, in particular for large body size, leads to increased body-size variation in experimentally harvested zebrafish (Danio rerio) populations exposed to two alternative feeding environments: ad libitum and temporarily restricted...

Data from: Phylogeography of Aegean green toads (Bufo viridis subgroup): continental hybrid swarm vs. insular diversification with discovery of a new island endemic

Christophe Dufresnes, Petros Lymberakis, Panagiotis Kornilios, Romain Savary, Nicoals Perrin & Matthias Stöck
Background: Debated aspects in speciation research concern the amount of gene flow between incipient species under secondary contact and the modes by which post-zygotic isolation accumulates. Secondary contact zones of allopatric lineages, involving varying levels of divergence, provide natural settings for comparative studies, for which the Aegean (Eastern Mediterranean) geography offers unique scenarios. In Palearctic green toads (Bufo viridis subgroup or Bufotes), Plio-Pleistocene (~2.6 Mya) diverged species show a sharp transition without contemporary gene flow,...

Data from: Do microplastic particles affect Daphnia magna at the morphological, life history and molecular level?

Hannes Imhof, Jakub Rusek, Michaela Thiel, Justyna Wolinska, Christian Laforsch & Hannes K. Imhof
Microplastic particles are ubiquitous not only in marine but also in freshwater ecosystems. However, the impacts of microplastics, consisting of a large variety of synthetic polymers, on freshwater organisms remains poorly understood. We examined the effects of two polymer mixtures on the morphology, life history and on the molecular level of the waterflea Daphnia magna (three different clones). Microplastic particles of ~40 µm were supplied at a low concentration (1% of the food particles) leading...

Data from: Systematic deviations from linear size spectra of lake fish communities are correlated with predator-prey interactions and lake-use intensity

Ignasi Arranz, Chih-Hao Hsieh, Thomas Mehner & Sandra Brucet
Size structure of organisms at logarithmic scale (i.e. size spectrum) can often be described by a linear function with a negative slope; however, substantial deviations from linearity have often been found in natural systems. Theoretical studies suggest that greater nonlinearity in community size spectrum is associated with high predator-prey size ratios but low predator-prey abundance ratios; however, empirical evaluation of the effects of predator-prey interactions on nonlinear structures remains scarce. Here, we aim to empirically...

Data from: Climate change-driven regime shifts in a planktonic food web

Sabine Wollrab, Lyubov Izmest’yeva, Svetlana Shimaraeva, Elena V. Pislegina, Olga Rusanovskaya & Eugene Silow
Predicting how food webs will respond to global environmental change is difficult because of the complex interplay between the abiotic forcing and biotic interactions. Mechanistic models of species interactions in seasonal environments can help understand the effects of global change in different ecosystems. Seasonally ice-covered lakes are warming faster than many other ecosystems and undergoing pronounced food web changes, making the need to forecast those changes especially urgent. Using a seasonally forced food web model...

Data from: From microbes to mammals: pond biodiversity homogenization across different land-use types in an agricultural landscape

Danny Ionescu, Mina Bizic, Rajat Karnatak, Camille Musseau, Gabriela Onandia, Minoru Kasada, Stella Angela Berger, Jens Nehstgaard, Gunnar Lischeid, Mark O. Gessner, Sabine Wollrab & Hans-Peter Grossart
Local biodiversity patterns are expected to strongly reflect variation in topography, land use, dispersal boundaries, nutrient supplies, contaminant spread, management practices and other anthropogenic influences. In contrast, studies focusing on specific taxa revealed a biodiversity homogenization effect in areas subjected to long-term intensive industrial agriculture. We investigated whether land use affects biodiversity levels and community composition (α & β diversity) in 67 kettle holes (KH) representing small aquatic islands embedded in the patchwork matrix of...

Data from: Sex-chromosome differentiation parallels post-glacial range expansion in European tree frogs (Hyla arborea).

Christophe Dufresnes, Youna Bertholet, Jérôme Wassef, Karim Ghali, Romain Savary, Baptiste Pasteur, Alan Brelsford, Beata Rozenblut-Kościsty, Maria Ogielska, Matthias Stöck & Nicolas Perrin
Occasional XY recombination is a proposed explanation for the sex-chromosome homomorphy in European tree frogs. Numerous laboratory crosses, however, failed to detect any event of male recombination, and a detailed survey of NW-European Hyla arborea populations identified male-specific alleles at sex-linked loci, pointing to the absence of XY recombination in their recent history. Here we address this paradox in a phylogeographic framework, by genotyping sex-linked microsatellite markers in populations and sibships from the entire species...

Data from: Evolutionary melting pots: a biodiversity hotspot shaped by ring diversifications around the Black Sea in the Eastern tree frog (Hyla orientalis)

Christophe Dufresnes, Spartak N. Litvinchuk, Julien Leuenberger, Karim Ghali, Oleksandr Zinenko, Matthias Stöck & Nicolas Perrin
Hotspots of intraspecific genetic diversity, which are of primary importance for the conservation of species, have been associated with glacial refugia, that is areas where species survived the Quaternary climatic oscillations. However, the proximate mechanisms generating these hotspots remain an open issue. Hotspots may reflect the long-term persistence of large refugial populations; alternatively, they may result from allopatric differentiation between small and isolated populations, that later admixed. Here, we test these two scenarios in a...

Data from: Spatial scaling of environmental variables improves species-habitat models of fishes in a small, sand-bed lowland river

Johannes Radinger, Christian Wolter & Jochem Kail
Habitat suitability and the distinct mobility of species depict fundamental keys for explaining and understanding the distribution of river fishes. In recent years, comprehensive data on river hydromorphology has been mapped at spatial scales down to 100 m, potentially serving high resolution species-habitat models, e.g., for fish. However, the relative importance of specific hydromorphological and in-stream habitat variables and their spatial scales of influence is poorly understood. Applying boosted regression trees, we developed species-habitat models...

Data from: Contrasting the roles of section length and instream habitat enhancement for river restoration success: a field study on 20 European restoration projects

Daniel Hering, Jukka Aroviita, Annette Baattrup-Pedersen, Karel Brabec, Tom Buijse, Frauke Ecke, Nikolai Friberg, Marek Gielczewski, Kathrin Januschke, Jan Köhler, Benjamin Kupilas, Armin W. Lorenz, Susanne Muhar, Amael Paillex, Michaela Poppe, Torsten Schmidt, Stefan Schmutz, Jan Vermaat, Piet F. M. Verdonschot, Ralf C. M. Verdonschot, Jochem Kail & Christian Wolter
1. Restoration of river hydromorphology often has limited detected effects on river biota. One frequently discussed reason is that the restored river length is insufficient to allow populations to develop and give the room for geomorphologic processes to occur. 2. We investigated ten pairs of restored river sections of which one was a large project involving a long, intensively restored river section and one represented a smaller restoration effort. The restoration effect was quantified by...

Data from: Individual and group performance suffers from social niche disruption

Kate L. Laskowski, Pierre-Olivier Montiglio & Jonathan N. Pruitt
The associated article has been retracted over concerns relating to irregularities found in the raw data. Concerns relating to the data can be found in the retraction notice: https://www.journals.uchicago.edu/doi/abs/10.1086/708066 The social niche specialization hypothesis predicts that animal personalities emerge as a result of individuals occupying different social niches within a group. Here we track individual personality and performance, and collective performance among groups of social spiders where we manipulated the familiarity of the group members....

Data from: Fast-slow life history is correlated with individual differences in movements and prey selection in an aquatic predator in the wild

Shinnosuke Nakayama, Tobias Rapp & Robert Arlinghaus
Fast and slow life histories are proposed to covary with consistent individual differences in behaviour, but little is known whether it holds in the wild, where individuals experience natural fluctuations of the environment. We investigated whether individual differences in behaviour, such as movement traits and prey selection, are linked to variation in life-history traits in Eurasian perch (Perca fluviatilis) in the wild. Using high-resolution acoustic telemetry, we collected the positional data of fish in a...

Data from: Collective decision making in guppies: a cross-population comparison study in the wild

Romain J. G. Clément, Julián Vicente-Page, Richard P. Mann, Ashley J. W. Ward, Ralf H. J. M. Kurvers, Indar W. Ramnarine, Gonzalo G. De Polavieja & Jens Krause
Collective cognition has received much attention in recent years but most of the empirical work has focused on comparing individuals and groups within single populations, thereby not addressing evolutionary origins of collective cognition. Here we investigated collective cognition in multiple populations that are subject to different levels of predation. Guppies (Poecilia reticulata) were given a simultaneous choice between an edible and a non-edible stimulus. We found evidence for an improvement in decision accuracy when in...

Data from: On the occurrence of three non-native cichlid species including the first record of a feral population of Pelmatolapia (Tilapia) mariae (Boulenger, 1899) in Europe

Juliane A. Y. Lukas, Jonas Jourdan, Gregor Kalinkat, Sebastian Emde, Friedrich Miesen, Hannah Jüngling, Berardino Cocchiararo & David Bierbach
Thermally influenced freshwater systems provide suitable conditions for non-native species of tropical and subtropical origin to survive and form proliferating populations beyond their native ranges. In Germany, non-native convict cichlids (Amatitlania nigrofasciata) and tilapia (Oreochromis sp.) have established populations in the Gillbach, a small stream that receives warm water discharge from a local power plant. Here, we report on the discovery of spotted tilapia (Pelmatolapia mariae) in the Gillbach, the first record of a reproducing...

Data from: Towards a mechanistic understanding of vulnerability to hook-and-line fishing: boldness as the basic target of angling-induced selection

Thomas Klefoth, Christian Skov, Anna Kuparinen & Robert Arlinghaus
In passively operated fishing gear, boldness-related behaviors should fundamentally affect the vulnerability of individual fish and thus be under fisheries selection. To test this hypothesis, we used juvenile common-garden reared carp (Cyprinus carpio) within a narrow size-range to investigate the mechanistic basis of behavioral selection caused by angling. We focused on one key personality trait (i.e., boldness), measured in groups within ponds, two morphological traits (body-shape and head-shape), and one life-history trait (juvenile growth capacity)...

Data from: Experimental duration and predator satiation levels systematically affect functional response parameters

Yuanheng Li, Björn C. Rall & Gregor Kalinkat
Empirical feeding studies where density-dependent consumption rates are fitted to functional response models are often used to parameterize the interaction strengths in models of population or food-web dynamics. However, the relationship between functional response parameter estimates from short-term feeding studies and real-world, long-term, trophic interaction strengths remains largely unexamined. In a critical first step to address this void, we tested for systematic effects of experimental duration and predator satiation on the estimate of functional response...

Data from: Profound genetic divergence and asymmetric parental genome contributions as hallmarks of hybrid speciation in polyploid toads

Caroline Betto-Colliard, Sylvia Hofmann, Roberto Sermier, Nicolas Perrin & Matthias Stöck
The evolutionary causes and consequences of allopolyploidization, an exceptional pathway to instant hybrid speciation, are poorly investigated in animals. In particular, when and why hybrid polyploids versus diploids are produced, and constraints on sources of paternal and maternal ancestors, remain underexplored. Using the Palearctic green toad radiation (including bisexually reproducing species of three ploidy levels) as model, we generate a range-wide multi-locus phylogeny of 15 taxa and present four new insights: (i) At least five...

Data from: Using a robotic fish to investigate individual differences in social responsiveness in the guppy

David Bierbach, Tim Landgraf, Pawel Romanczuk, Juliane Lukas, Hai Nguyen, Max Wolf & Jens Krause
Responding towards the actions of others is one of the most important behavioral traits whenever animals of the same species interact. Mutual influences among interacting individuals may modulate the social responsiveness seen and thus makes it often difficult to study the level and individual variation in responsiveness. Here, open-loop biomimetic robots that provide standardized, non-interactive social cues can be a useful tool. These robots are not affected by the live animal’s actions but are assumed...

Data from: Testing the devil's impact on southern Baltic and North Sea basin whitefish (Coregonus spp.) diversity

Thomas Mehner, Kirsten Pohlmann, David Bittner & Jörg Freyhof
Background: The diversity and phylogeny of whitefish of the genus Coregonus is complex, and includes many endemic species of high conservation concern. However, because of commercial importance of whitefish fisheries, stockings and translocations have occurred repeatedly, which challenges the identification of local populations as conservation units. This study analyses the phylogenetic relationships of 15 contemporary and two historical populations of lake-resident and anadromous whitefish (Coregonus spp.) from the southern Baltic and North Sea basins. We...

Data from: Spatial variation in throughfall, soil, and plant water isotopes in a temperate forest

Gregory R. Goldsmith, Scott T. Allen, Sabine Braun, Nadine Engbersen, Clara Romero González-Quijano, James W. Kirchner & Rolf T.W. Siegwolf
Studies of stable isotopes of water in the environment have been fundamental to advancing our understanding of how water moves through the soil-plant-atmosphere continuum; however, much of this research focuses on how water isotopes vary in time, rather than in space. We examined the spatial variation in the δ18O and δ2H of throughfall and bulk soil water, as well as branch xylem and bulk leaf water of Picea abies (Norway Spruce) and Fagus sylvatica (Beech),...

Data from: Size-selective harvesting fosters adaptations in mating behavior and reproductive allocation, affecting sexual selection in fish

Valerio Sbragaglia, Catalina Gliese, David Bierbach, Andrew Honsey, Silva Uusi-Heikkilä & Robert Arlinghaus
1. The role of sexual selection in the context of harvest-induced evolution is poorly understood. However, elevated and trait-selective harvesting of wild populations may change sexually-selected traits, which in turn can affect mate choice and reproduction. 2. We experimentally evaluated the potential for fisheries-induced evolution of mating behavior and reproductive allocation in fish. 3. We used a unique experimental system of zebrafish (Danio rerio) lines exposed to large, small, or random (i.e. control) size-selective mortality....

Rethinking megafauna

Marcos Moleón, José Sánchez-Zapata, José Donázar, Eloy Revilla, Berta Martín-López, Cayetano Gutiérrez-Cánovas, Wayne Getz, Zebensui Morales-Reyes, Ahimsa Campos-Arceiz, Larry Crowder, Mauro Galetti, Manuela González-Suárez, Fengzhi He, Pedro Jordano, Rebecca Lewison, Robin Naidoo, Norman Owen-Smith, Nuria Selva, Jens-Christian Svenning, José Tella, Christiane Zarfl, Sonja Jähnig, Matt Hayward, Søren Faurby, Nuria García … & Klement Tochner
Concern for megafauna is increasing among scientists and non-scientists. Many studies have emphasized that megafauna play prominent ecological roles and provide important ecosystem services to humanity. But, what precisely are “megafauna”? Here we critically assess the concept of megafauna and propose a goal-oriented framework for megafaunal research. First, we review definitions of megafauna and analyze associated terminology in the scientific literature. Second, we conduct a survey among ecologists and paleontologists to assess the species traits...

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