10 Works

Foliar summer frost resistance measured via electrolyte leakage approach as related to plant distribution, community composition and performance

Solveig Franziska Bucher & Sergey Rosbakh
1. Frost resistance (FR) is a fundamental process determining various aspects of plant life. Measurements of FR remain challenging as existing methods are time- and labour-intensive. 2. Here, we test the applicability of foliar summer FR measured via the ‘electrolyte leakage’ approach (FRPEL), a simple and inexpensive technique so far underused in ecological research to estimate FR. We tested the ability of this trait to predict i) species occurrence, ii) community composition along an elevational...

Le redoublement du sujet en français parlé* Motivations rythmiques

Anke Grutschus & Sandra Schwab

Source data for: Presynaptic NMDARs cooperate with local spikes toward GABA release from the reciprocal olfactory bulb granule cell spine

Veronica Egger, Vanessa Lage-Rupprecht, Li Zhou, Gaia Bianchini, S. Sara Aghvami, Balazs Rozsa, Marco Sassoe-Pognetto & Max Mueller
In the rodent olfactory bulb the smooth dendrites of the principal glutamatergic mitral cells (MCs) form reciprocal dendrodendritic synapses with large spines on GABAergic granule cells (GC), where unitary release of glutamate can trigger postsynaptic local activation of voltage-gated Na+-channels (Navs), i.e. a spine spike. Can such single MC input evoke reciprocal release? We find that unitary-like activation via two-photon uncaging of glutamate causes GC spines to release GABA both synchronously and asynchronously onto MC...

Environmental heterogeneity predicts global species richness patterns better than area

Kristy Udy, Matthias Fritsch, Katrin Meyer, Ingo Grass, Sebastian Hanß, Florian Hartig, Thomas Kneib, Hoger Kreft, Collins Kukuna, Guy Pe'er, Hannah Reininghaus, Britta Tietjen, Clara-Sophie Van Waveren, Kerstin Wiegand & Teja Tscharntke
Aim: It is widely accepted that biodiversity can be determined by niche-relate processes and by pure area effects from local to global scales. Their relative importance, however, is still disputed, and empirical tests are still surprisingly scarce at the global scale. We compare the explanatory power of area and environmental heterogeneity as a proxy for niche-related processes as drivers of native mammal species richnessworldwide and with biogeographical regions. Location: Global Time Period: Data was collated...

Informationsverarbeitung in privaten Chroniken Londoner Bürger (14.–16. Jahrhundert)

Charlotte Neubert
This paper deals with the production of urban chronicles written by London citizens who were deeply involved in the elite political and economic circles from the end of the 14th to the beginning of the 16th century. The desire to belong or to identify with London’s urban community will be considered as the reason behind the intense engagement with history and the pronounced awareness of historicity to be found in the three examples discussed here:...

MSAP and AFLP fingerprints

Ellen Pagel
Plant species differ in their ecological amplitude, with some species occurring in very different habitats under strongly differentiated environmental conditions. We were interested in to what extent the occurrence of Linum catharticum in dry calcareous grasslands (Bromion) and wet litter meadows (Molinion), two habitats on opposing ends concerning e.g., moisture level, is reflected on the genetic and epigenetic level. Using AFLP (amplified fragment length polymorphisms) and MSAP (methylation sensitive amplification polymorphisms) analyses we studied the...

Queen execution in a monogynous ant

Jürgen Heinze & Julia Giehr
Workers in many species of social insects are capable of laying unfertilized eggs, which can develop into haploid males. This causes a conflict about male parentage between queens and workers. In a few species, this may result in matricide, i.e., workers kill the colony’s queen. Queen killing has so far been observed mainly in multi-queen colonies or in annual species, when the queen’s fecundity declines at the end of the reproductive period. Here, we report...

Negative feedback: ants choose unoccupied over occupied food sources and lay more pheromone to them

Stephanie Wendt, Nico Kleinhoelting & Tomer J. Czaczkes
In order to make effective collective decisions, ants lay pheromone trails to lead nestmates to acceptable food sources. The strength of a trail informs other ants about the quality of a food source, allowing colonies to exploit the most profitable resources. However, recruiting too many ants to a single food source can lead to over-exploitation, queuing, and thus decreased food intake of the colony. The non-linear nature of pheromonal recruitment can also lead colonies to...

European soil seed bank communities across a climate and land-cover gradient

Jan Plue, Hans Van Calster, Inger Auestad, Sofia Basto, Reneé M. Bekker, Hans Henrik Bruun, Richard Chevalier, Guillaume Decocq, Ulf Grandin, Martin Hermy, Hans Jacquemyn, Anna Jakobsson, Rein Kalamees, Rob H. Marrs, Bryndis Marteinsdóttir, Per Milberg, Robin J. Pakeman, Gareth Phoenix, Ken Thompson, Vigdis Vandvik, Markus Wagner, Sara A.O. Cousins, Ove Eriksson, Jamshid Ghorbani, Małgorzata Jankowska-Błaszczuk … & Alistair G. Auffret
This is the data set used for the publication Buffering effects of soil seed banks on plant community composition in response to land use and climate, published in the journal Global Ecology and Biogeography. Aim. Climate and land use are key determinants of biodiversity, with past and ongoing changes posing serious threats to global ecosystems. Unlike most other organism groups, plant species can possess dormant life-history stages such as soil seed banks, which may help...

Dendritic integration in olfactory bulb granule cells upon simultaneous multi-spine activation: Low thresholds for non-local spiking activity

Max Müller & Veronica Egger
The inhibitory axonless olfactory bulb granule cells form reciprocal dendrodendritic synapses with mitral and tufted cells via large spines, mediating recurrent and lateral inhibition. As a case in point for dendritic transmitter release, rat granule cell dendrites are highly excitable, featuring local Na+ spine spikes and global Ca2+- and Na+-spikes. To investigate the transition from local to global signaling we performed holographic, simultaneous two-photon uncaging of glutamate at up to twelve granule cell spines, along...

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Affiliations

  • University of Regensburg
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  • National Research Institute for Agriculture, Food and Environment
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  • Centre for Ecology and Hydrology
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  • Fraunhofer Institute for Algorithms and Scientific Computing
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  • University of Groningen
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