117 Works

Floral preferences of mountain bumble bees are constrained by functional traits but flexible through elevation and season

Douglas Sponsler, Katharina Kallnik, Fabrice Requier, Alice Classen, Anne Maihoff, Johanna Sieger & Ingolf Steffan-Dewenter
Patterns of resource use by animals can clarify how ecological communities have assembled in the past, how they currently function, and how they are likely to respond to future perturbations. Bumble bees (Hymentoptera: Bombus spp.) and their floral hosts provide a diverse yet tractable system in which to explore resource selection in the context of plant-pollinator networks. Under conditions of resource limitation, the ability of bumble bees species to coexist should depend on dietary niche...

Data from: Model-based acceleration of Look-Locker T1 mapping

Johannes Tran-Gia, Tobias Wech, Thorsten A. Bley, Herbert Köstler & Thorsten Bley
Mapping the longitudinal relaxation time T1 has widespread applications in clinical MRI as it promises a quantitative comparison of tissue properties across subjects and scanners. Due to the long scan times of conventional methods, however, the use of quantitative MRI in clinical routine is still very limited. In this work, an acceleration of Inversion-Recovery Look-Locker (IR-LL) T1 mapping is presented. A model-based algorithm is used to iteratively enforce an exponential relaxation model to a highly...

Data from: Picky hitch-hikers: vector choice leads to directed dispersal and fat-tailed kernels in a passively dispersing mite

Emanuel A. Fronhofer, Ellen B. Sperr, Anna Kreis, Manfred Ayasse, Hans Joachim Poethke & Marco Tschapka
Dispersal is a central life-history trait for most animals and plants: it allows to colonize new habitats, escape from competition or avoid inbreeding. Yet, not all species are mobile enough to perform sufficient dispersal. Such passive dispersers may use more mobile animals as dispersal vectors. If multiple potential vectors are available, an active choice can allow to optimize the dispersal process and to determine the distribution of dispersal distances, i.e. an optimal dispersal kernel. We...

Data from: Independent effects of host and environment on the diversity of wood-inhabiting fungi

Franz-Sebastian Krah, Sebastian Seibold, Roland Brandl, Petr Baldrian, Jörg Müller & Claus Bässler
1. Dead wood is a habitat for numerous fungal species, many of which are important agents of decomposition. Previous studies suggested that wood-inhabiting fungal communities are affected by climate, availability of dead wood in the surrounding landscape and characteristics of the colonized dead-wood object (e.g. host tree species). These findings indicate that different filters structure fungal communities at different scales, but how these factors individually drive fungal fruiting diversity on dead-wood objects is unknown. 2....

Data from: A new enigmatic hyolith from the Cambrian of West Gondwana and its bearing on the systematics of hyoliths

Gerd Geyer
The genus Aladraco nom. nov. is described and discussed with two species recognized from coeval strata of the lower traditional middle Cambrian, A. schloppensis (Wurm, 1925) from the Tannenknock Formation of the Franconian Forest region, Germany, and A. ougnatensis sp. nov. from the Jbel Wawrmast Formation of the eastern Anti-Atlas, Morocco. Aladraco was formerly known as Oxyprymna Kiderlen, 1933, a preoccupied generic name that compelled renaming of the genus. The genus bears morphological characters such...

Data from: Landscape-level crop diversity benefits biological pest control

Sarah Redlich, Emily A. Martin & Ingolf Steffan-Dewenter
1.Landscape-level crop diversification is a promising tool for ecological intensification, whereby biodiversity and ecosystem services are enhanced, and pesticide applications reduced. Yet evidence for the effects of crop diversity at multiple scales and in different landscape contexts is lacking. Here, we investigate the potential benefits and context-dependencies of multiscale crop diversity on natural enemies and overall biological control in winter wheat. Simultaneously, we examine the mediating effects of bird predation on aphid regulation in this...

Data from: Assortative mating counteracts the evolution of dispersal polymorphisms

Emanuel A. Fronhofer, Alexander Kubisch, Thomas Hovestadt & Hans Joachim Poethke
Polymorphic dispersal strategies are found in many plant and animal species. An important question is how the genetic variation underlying such polymorphisms is maintained. Numerous mechanisms have been discussed, including kin competition or frequency-dependent selection. In the context of sympatric speciation events genetic and phenotypic variation is often assumed to be preserved by assortative mating. Thus, recently, this has been advocated as a possible mechanism leading to the evolution of dispersal polymorphisms. Here, we examine...

Data from: Functional identity and diversity of animals predict ecosystem functioning better than species-based indices

Vesna Gagic, Ignasi Bartomeus, Astrid Taylor, Camilla Winqvist, Christina Fischer, Eleanor M. Slade, Ingolf Steffan-Dewenter, Mark Emmerson, Simon G. Potts, Teja Tscharntke, Wolfgang Weisser, Riccardo Bommarco & T. Jonsson
Drastic biodiversity declines have raised concerns about the deterioration of ecosystem functions and have motivated much recent research on the relationship between species diversity and ecosystem functioning. A functional trait framework has been proposed to improve the mechanistic understanding of this relationship, but this has rarely been tested for organisms other than plants. We analysed eight datasets, including five animal groups, to examine how well a trait-based approach, compared with a more traditional taxonomic approach,...

Data from: Comparative landscape genetics of two river frog species occurring at different elevations on Mount Kilimanjaro

Giulia Zancolli, Mark-Oliver Rödel, Ingolf Steffan-Dewenter & Andrew Storfer
Estimating population connectivity and species’ abilities to disperse across the landscape is crucial for understanding the long-term persistence of species in changing environments. Surprisingly, few landscape genetics studies focused on tropical regions despite the alarming extinction rates within these ecosystems. Here, we compared the influence of landscape features on the distribution of genetic variation of an Afromontane frog, Amietia wittei, with that of its more broadly distributed lowland congener, A. angolensis, on Mt. Kilimanjaro, Tanzania....

Data from: High cover of hedgerows in the landscape supports multiple ecosystem services in Mediterranean cereal fields

Matteo Dainese, Silvia Montecchiari, Tommaso Sitzia, Maurizia Sigura & Lorenzo Marini
Field-margin diversification through conservation and restoration of hedgerows is becoming a prominent intervention for promoting biodiversity and associated ecosystem services in intensive agricultural landscapes. However, how increasing cover of hedgerows in the landscape can affect ecosystem services has rarely been considered. Here, we assessed the effect of increased field-margin complexity at the local scale and increasing cover of hedgerows in the landscape on the provision of pest control, weed control and potential pollination. Locally, three...

Data from: Agri-environmental schemes promote ground-dwelling predators in adjacent oilseed rape fields: diversity, species traits and distance-decay functions

Fabian A. Boetzl, Elena Krimmer, Jochen Krauss & Ingolf Steffan-Dewenter
1. Rising demands for agricultural products and high environmental costs of intensive agriculture reinforce the need for ecological replacements in agricultural management. In Europe, agri-environmental schemes (AES) are implemented to enhance species richness and provision of ecosystem services, but the effectiveness of different AES types and the spatial extent of possible beneficial effects are little understood. In this study we assessed the effects of different AES types on diversity, species traits and distance-decay functions of...

Data from: The interplay of landscape composition and configuration: new pathways to manage functional biodiversity and agro-ecosystem services across Europe

Emily A. Martin, Matteo Dainese, Yann Clough, András Báldi, Riccardo Bommarco, Vesna Gagic, Michael Garratt, Andrea Holzschuh, David Kleijn, Anikó Kovács-Hostyánszki, Lorenzo Marini, Simon G. Potts, Henrik G. Smith, Diab Al Hassan, Matthias Albrecht, Georg K. S. Andersson, Josep Asis, Stephanie Aviron, Mario Balzan, Laura Baños-Picón, Ignasi Bartomeus, Peter Batary, Françoise Burel, Berta Caballero-López, Elena D. Concepcion … & Ingolf Steffan-Dewenter
Managing agricultural landscapes to support biodiversity and ecosystem services is a key aim of a sustainable agriculture. However, how the spatial arrangement of crop fields and other habitats in landscapes impacts arthropods and their functions is poorly known. Synthesising data from 49 studies (1515 landscapes) across Europe, we examined effects of landscape composition (% habitats) and configuration (edge density) on arthropods in fields and their margins, pest control, pollination and yields. Configuration effects interacted with...

Contrasting patterns of richness, abundance, and turnover in mountain bumble bees and their floral hosts

Douglas Sponsler
Environmental gradients generate and maintain biodiversity on Earth. Mountain slopes are among the most pronounced terrestrial environmental gradients, and the elevational structure of species and their interactions can provide unique insight into the processes that govern community assembly and function in mountain ecosystems. We recorded bumble bee-flower interactions over three years along an 1400 m elevational gradient in the German Alps. Using nonlinear modeling techniques, we analyzed elevational patterns at the levels of abundance, species...

Data from: Nectar robbing rather than pollinator availability constrains reproduction of a bee-flowered plant at high elevations

Patrick Laurenz Kohl & Ingolf Steffan-Dewenter
The files contain data on the floral ecology of Clinopodium alpinum collected along an elevational gradient in the Berchtesgaden National Park in Germany in 2017. The data are presented in the work entitled "Nectar robbing rather than pollinator availability constrains reproduction of a bee-flowered plant at high elevations" by Patrick L. Kohl and Ingolf Steffan-Dewenter. Files include data on flower visitor observations (including raw data on the number of visits by individual specifmens), data on...

Data from: Introduced bees (Osmia cornifrons) collect pollen from both coevolved and novel host-plant species within their family-level phylogenetic preferences

Anthony Vaudo, David Biddinger, Wiebke Sickel, Alexander Keller & Margarita M Lopez-Uribe
Studying the pollen preferences of introduced bees allows us to investigate how species utilize host-plants when establishing in new environments. Osmia cornifrons is a solitary bee introduced into North America from East-Asia for pollination of crops in the Rosaceae. We investigated whether O. cornifrons 1) more frequently collected pollen from host-plant species they coevolved with from their geographic origin, or 2) prefer hosts-plant species of specific plant taxa independent of origin. To address this question,...

Evidence of cognitive spezialization in an insect: proficiency is maintained across elemental and higher-order visual learning but not between sensory modalities in honey bees

Valerie Finke, David Baracchi, Martin Giurfa, Ricarda Scheiner & Aurore Avarguès-Weber
Individuals differing in their cognitive abilities and foraging strategies may confer a valuable benefit to their social groups as variability may help responding flexibly in scenarios with different resource availability. Individual learning proficiency may either be absolute or vary with the complexity or the nature of the problem considered. Determining if learning abilities correlate between tasks of different complexity or between sensory modalities has a high interest for research on brain modularity and task-dependent specialisation...

Data from: The rising moon promotes mate finding in moths

Jacqueline Degen
To counteract insect decline, it is essential to understand the underlying causes, especially for key pollinators such as nocturnal moths whose ability to orientate can easily be influenced by ambient light conditions. These comprise natural light sources as well as artificial light, but their specific relevance for moth orientation is still unknown. We investigated the influence of moonlight on the reproductive behavior of privet hawkmoths (Sphinx ligustri) at a relatively dark site where the Milky...

Data from: On the objectivity, reliability, and validity of deep learning enabled bioimage analyses

Dennis Segebarth, Matthias Griebel, Nikolai Stein, Cora R. Von Collenberg, Corinna Martin, Dominik Fiedler, Lucas B. Comeras, Anupam Sah, Victoria Schoeffler, Theresa Lüffe, Alexander Dürr, Rohini Gupta, Manju Sasi, Christina Lillesaar, Maren D. Lange, Ramon O. Tasan, Nicolas Singewald, Hans-Christian Pape, Christoph M. Flath & Robert Blum
Bioimage analysis of fluorescent labels is widely used in the life sciences. Recent advances in deep learning (DL) allow automating time-consuming manual image analysis processes based on annotated training data. However, manual annotation of fluorescent features with a low signal-to-noise ratio is somewhat subjective. Training DL models on subjective annotations may be instable or yield biased models. In turn, these models may be unable to reliably detect biological effects. An analysis pipeline integrating data annotation,...

Disentangling effects of climate and land use on biodiversity and ecosystem services – a multi-scale experimental design

Sarah Redlich, Jie Zhang, Caryl Benjamin, Maninder Singh Dhillon, Jana Englmeier, Jörg Ewald, Ute Fricke, Cristina Ganuza, Maria Hänsel, Thomas Hovestadt, Johannes Kollmann, Thomas Koellner, Carina Kübert-Flock, Harald Kunstmann, Annette Menzel, Christoph Moning, Wibke Peters, Rebekka Riebl, Thomas Rummler, Sandra Rojas Botero, Cynthia Tobisch, Johannes Uhler, Lars Uphus, Jörg Müller & Ingolf Steffan-Dewenter
1. Climate and land-use change are key drivers of environmental degradation in the Anthropocene, but too little is known about their interactive effects on biodiversity and ecosystem services. Long-term data on biodiversity trends are currently lacking. Furthermore, previous ecological studies have rarely considered climate and land use in a joint design, did not achieve variable independence or lost statistical power by not covering the full range of environmental gradients. 2. Here, we introduce a multi-scale...

Alpine butterflies want to fly high: Species and communities shift upwards faster than their host plants

Janika M. Kerner, Jochen Krauss, Fabienne Maihoff, Lukas Bofinger & Alice Classen
Despite sometimes strong co-dependencies of insect herbivores and plants, responses of individual taxa to accelerating climate change are typically studied in isolation. Thereby, biotic interactions that potentially limit species in tracking their preferred climatic niches are ignored. Here, we chose butterflies as a prominent representative of herbivorous insects to investigate the impacts of temperature changes and their larval host plant distributions along a 1.4 km elevational gradient in the German Alps. Following a sampling protocol...

Efficient Complexation of N-Acetyl Amino Acid Carboxylates in Water by an Artificial Receptor:  Unexpected Cooperativity in the Binding of Glutamate but Not Aspartate

Carsten Schmuck & Lars Geiger
A new tris-cation 1 binds N-acetyl amino acid carboxylates in water even at millimolar salt concentrations with Kass ≈ 103 M-1 due to a clustering of electrostatic interactions. Binding is efficient enough to allow a naked-eyed detection using an indicator displacement assay. Furthermore, receptor 1 shows an unexpected 2:1 complex formation with strong positive cooperativity with glutamate but not aspartate.

Data from: Limitation of complementary resources affects colony growth, foraging behavior, and reproduction in bumble bees

Fabrice Requier, Kim K. Jowanowitsch, Katharina Kallnik & Ingolf Steffan-Dewenter
Resource availability has been disturbed for many organisms in agricultural landscapes including pollinator species. Abundance and diversity in flower availability benefit bee populations, however, little is known about which of protein or carbohydrate resources may limit their growth and reproductive performance. Here, we test the hypothesis of complementary resource limitation using a supplemental feeding approach. We applied this assumption with bumble bees (Bombus terrestris), assuming that colony growth and reproductive performance should depend on the...

Data from: Contribution of European forests to safeguard wild honey bee populations

Fabrice Requier, Yoan Paillet, Fabien Laroche, Benjamin Rutschmann, Jie Zhang, Fabio Lombardi, Miroslav Svoboda & Ingolf Steffan-Dewenter
Recent studies reveal the use of tree cavities by wild honey bee colonies in European forests. This highlights the conservation potential of forests for a highly threatened component of the native entomofauna in Europe, but currently no estimate of potential wild honey bee population sizes exists. Here, we analysed the tree cavity densities of 106 forest areas across Europe and inferred an expected population size of wild honey bees. Both forest and management types affected...

Drosophila carboxypeptidase D (SILVER) is a key enzyme in neuropeptide processing required to maintain locomotor activity levels and survival rate

Dennis Pauls, Yasin Hamarat, Luisa Trufasu, Tim M. Schendzielorz, Gertrud Gramlich, Jörg Kahnt, Jens T. Vanselow, Andreas Schlosser & Christian Wegener
Neuropeptides are processed from larger preproproteins by a dedicated set of enzymes. The molecular and biochemical mechanisms underlying preproprotein processing and the functional importance of processing enzymes are well‐characterised in mammals, but little studied outside this group. In contrast to mammals, Drosophila melanogaster lacks a gene for carboxypeptidase E (CPE), a key enzyme for mammalian peptide processing. By combining peptidomics and neurogenetics, we addressed the role of carboxypeptidase D (dCPD) in global neuropeptide processing and...

Are native and non-native pollinator friendly plants equally valuable for native wild bee communities?

Nicola Seitz, Dennis VanEngelsdorp & Sara D. Leonhardt
Bees rely on floral pollen and nectar for food. Therefore, pollinator friendly plantings are often used to enrich habitats in bee conservation efforts. As part of these plantings, non-native plants may provide valuable floral resources, but their effects on native bee communities have not been assessed in direct comparison with native pollinator friendly plantings. In this study, we performed a common garden experiment by seeding mixes of 20 native and 20 non-native pollinator friendly plant...

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  • University of Würzburg
  • University of Göttingen
  • Technical University Munich
  • Lund University
  • University of Bayreuth
  • Swedish University of Agricultural Sciences
  • University of Reading
  • Philipp University of Marburg
  • University of Freiburg
  • Estación Biológica de Doñana