Data from: Nectar robbing rather than pollinator availability constrains reproduction of a bee-flowered plant at high elevationsPatrick 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...
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...
Two light sensors decode moonlight versus sunlight to adjust a plastic circadian/circalunidian clock to moon phaseMartin Zurl, Birgit Poehn, Shruthi Krishnan, Dunja Rokvic, Vinoth Babu Veedin Rajan, Matthias Schlichting, Lukas Orel, Aida Coric, Robert Lucas, Eva Wolf, Charlotte Helfrich-Förster, Florian Raible & Kristin Tessmar-Raible
Many species synchronize their physiology and behavior to specific hours. It is commonly assumed that sunlight acts as the main entrainment signal for ~24h clocks. However, the moon provides similarly regular time information. Consistently, a growing number of studies have reported correlations between diel behavior and lunidian cycles. Yet, mechanistic insight into the possible influences of the moon on ~24hr timers remains scarce. We have explored the marine bristleworm Platynereis dumerilii to investigate the role...
Data from: Natural Zeitgebers under temperate conditions cannot compensate for the loss of a functional circadian clock in timing of a vital behavior in DrosophilaChristian Wegener, Franziska Ruf, Simon Tii Mungwa, Melanie Horn & Dirk Rieger
The adaptive significance of adjusting behavioral activities to the right time of the day seems obvious but is under debate. Our data provides evidence that proper timing of eclosion, a vital behavior of the fruit fly Drosophila melanogaster, requires a functional molecular clock under quasi-natural conditions. We compared eclosion profiles and assessed eclosion rhythmicity in wildtype flies (CS) and clock-related mutant strains (per01, pdf01, han5304) under laboratory and outdoor conditions. In the laboratory, flies were...
Data from: Landscape diversity and local temperature, but not climate, affect arthropod predation among habitat typesUte Fricke, Ingolf Steffan-Dewenter, Jie Zhang, Cynthia Tobisch, Sandra Rojas-Botero, Caryl S Benjamin, Jana Englmeier, Cristina Ganuza, Maria Haensel, Rebekka Riebl, Johannes Uhler, Lars Uphus, Jörg Ewald, Johannes Kollmann & Sarah Redlich
Arthropod predators are relevant for top-down regulation of insect herbivores. Biotic and abiotic factors influence predator communities and their activity with consequences for the strength of top-down regulation (‘arthropod predation’). Anthropogenic climate and land-use change urges a deeper understanding of the combined effects of potential drivers on arthropod predation. This study obtained arthropod predation rates on 113 plots of open herbaceous vegetation adjacent to different habitat types (forest, grassland, arable field, settlement) along climate and...
Ant body size mediates functional performance and species interactions in carrion decomposer communitiesSabine Sylvia Nooten, Kin Chan, Patrick Schultheiss, Taylor Bogar & Benoit Guénard
Growing concern over rapid species declines and extinctions has led to considerable interest in the role of biodiversity for maintaining ecological processes. However, the loss of particular species has more pronounced effects on ecosystem services than others, highlighting the importance of key functional species traits and their relationships to ecosystem functioning. Human induced disturbances, such as species invasions, land use changes or abiotic changes, appear to disproportionally impact larger species rather than smaller ones. The...
Data from: Plant richness, land use and temperature differently shape invertebrate leaf-chewing herbivory on plant functional groupsUte Fricke, Sarah Redlich, Jie Zhang, Cynthia Tobisch, Sandra Rojas-Botero, Caryl S. Benjamin, Jana Englmeier, Cristina Ganuza, Rebekka Riebl, Johannes Uhler, Lars Uphus, Jörg Ewald, Johannes Kollmann & Ingolf Steffan-Dewenter
Nutrient demands of leaf-chewing invertebrate herbivores change with temperature, which causes shifts in herbivores’ diets. Temperature may act differently on herbivore species, so that factors shaping herbivore species richness may modulate temperature effects on invertebrate herbivory among plant functional groups with different nutrient composition (C:N ratio low to high: legumes, non-leguminous forbs, grasses). Global warming urges a deeper understanding of temperature effects on herbivory among plant functional groups in different habitats and landscapes. This study...
High variation in hydraulic efficiency but not xylem safety between roots and branches in four temperate broad-leaved tree speciesTorben Lübbe, Laurent J. Lamarque, Sylvain Delzon, José M. Torres-Ruiz, Régis Burlett, Christoph Leuschner & Bernhard Schuldt
Xylem hydraulic safety and efficiency are key traits determining tree fitness in a warmer and drier world. While numerous plant hydraulic studies have focused on branches, our understanding of root hydraulic functioning remains limited, although roots control water uptake, influence stomatal regulation and have commonly been considered as the most vulnerable organ along the hydraulic pathway. We investigated 11 traits related to xylem safety and efficiency along the hydraulic pathway in four temperate broad-leaved tree...
Metabarcoding of canopy arthropods reveals negative impacts of forestry insecticides on community structure across multiple taxaBenjamin Leroy, Sebastian Seibold, Jérôme Morinière, Vedran Bozicevic, Jessica Jaworek, Nicolas Roth, Sebastian Vogel, Sharon Zytynska, Ralf Petercord, Peter Eichel & Wolfgang Weisser
1. Insecticides used to combat outbreaks of forest defoliators can adversely affect non-target arthropods. Forest use insecticides typically suppress Lepidoptera larvae which are the keystone of the canopy community of deciduous oak forests. The abrupt removal of this dominant component of the food web could have far-reaching implications for forest ecosystems, yet it is rarely investigated in practice owing to several methodological shortcomings. The taxonomic impediment and the biased nature of arthropod sampling techniques particularly...
Phylogenetic relatedness of food plants reveals highest insect herbivore specialization at intermediate temperatures along a broad climatic gradientSebastian König, Jochen Krauss, Alexander Keller & Ingolf Steffan-Dewenter
Phytophagous insects differ in their degree of specialisation, biased by resource availability. The composition and richness of herbivore and plant assemblages change along climatic gradients, but knowledge about associated shifts in specialisation is scarce and lacks controlling for abundance and phylogeny of interaction partners. Thus, we aimed to test whether the specialisation of herbivores in insect- plant – interaction networks decreases towards cold habitats as predicted by the ‘altitude niche-breadth hypothesis’ to forecast possible consequences...
Forest species are affected by macroclimate, however, the microclimatic variability can be more extreme and change through climate change. Fungal fruiting community composition was affected by microclimatic differences. Here we ask whether differences in the fruiting community can be explained by morphological traits of the fruit body, which may help endure harsh conditions. We used a dead wood experiment and macrofungal fruit body size, color, and toughness. We exposed logs of two host tree species...
Blast output from: Lost in dead wood? Environmental DNA sequencing from dead wood shows little signs of saproxylic beetlesNathalie Winiger, Sebastian Seibold, Kay Lucek, Jörg Müller & Gernot Segelbacher
eDNA metabarcoding has become a standard method for assessing wood-inhabiting fungi and bacteria, yet determination of dead-wood-inhabiting beetles still relies on time-consuming collection of beetle specimens. We thus tested whether beetle species can be identified by eDNA sequencing of wood in a mesocosm experiment that manipulated species assemblages. Dead wood samples were taken at exit holes of beetles and DNA was extracted and analyzed using two comparative methods: (i) metabarcoding with standard arthropod primers (421...
Low toxicity crop fungicide (Fenbuconazole) impacts reproductive male quality signals leading to a reduction of mating success in a wild solitary beeSamuel Boff, Taina Conrad, Josué Raizer, Marten Wehrhahn, Melis Bayer, Anna Friedel, Panagiotis Theodorou, Thomas Schmitt & Daniela Lupi
Recent reports on bee health suggest that sub-lethal doses of pesticides have negative effects on wild bee reproduction and ultimately on their population growth. Females of the solitary horned mason bee, Osmia cornuta, evaluate thoracic vibrations and odours of males to assess male quality. When certain criteria are met, the female accepts the male and copulates. However, these signals were found to be modified by sub-lethal doses of pesticides in other hymenopterans. Here, we tested...
Light and malaise traps tell different stories about the spatial variations in arthropod biomass and method-specific insect abundanceAnnika Busse, Claus Bässler, Roland Brandl, Nicolas Friess, Hermann Hacker, Lea Heidrich, Torben Hilmers, Gisela Merkel-Wallner, Christian Schmid-Egger, Linda Seifert & Jörg Müller
1. Conclusions reached in meta-analyses of changes in insect communities may be influenced by method-specific sampling biases, which may lead to inappropriate conservation measures. 2. We argue that the contradictory conclusions regarding terrestrial insect biomass, abundance and richness patterns are, at least partly, due to methodological limitations that reflect taxon-specific responses to environmental changes. 3. In this study, light and Malaise traps were simultaneously deployed to sample insects at 52 plots in a temperate forest...
University of Würzburg14
University of Bayreuth3
Technical University of Munich3
Weihenstephan-Triesdorf University of Applied Sciences2
Philipp University of Marburg2
Technical University Munich2
Goethe University Frankfurt2
University of Milan1
University of Göttingen1