12 Works

Experimental increase in fecundity causes upregulation of fecundity and body maintenance genes in the fat body of ant queens

Susanne Foitzik
In most organisms, fecundity and longevity are negatively associated and the molecular regulation of these two life history traits is highly interconnected. In addition, nutrient intake often has opposing effects on lifespan and reproduction. In contrast to solitary insects, the main reproductive individual of social hymenopterans, the queen, is also the most long-lived. During development, queen larvae are well-nourished, but we are only beginning to understand the impact of nutrition on the queens’ adult life...

The evolution of hemocyanin genes in Tectipleura - a multitude of conserved introns in highly diverse gastropods

Gabriela Schäfer, Veronika Pedrini-Martha, Daniel John Jackson, Reinhard Dallinger & Bernhard Lieb
Background: Hemocyanin is the oxygen transporter of most molluscs. Thus, it is an essential protein of these animals which needs to be adapted perfectly to their environments. In Tectipleura, which is a very large and diverse gastropod group with >27,000 species living in all kinds of habitats, several hemocyanin genes have already been identified. They evolved independently from each other within different lineages due to multiple gene duplications and represent potential adaptations to different environments...

Emotionen in Bittschriften siebenbürgischer Kleriker der unierten Kirche an den Wiener Hof im 18. Jahrhundert

Hans-Christian Maner
The “long” 18th century, which historiography also calls the “great century” or the “century of happiness”, was neither “great” nor “happy” for a large part of the inhabitants of Transylvania. This thesis of an early modern historian is to be examined and substantiated. Using the example of some petitions from greek catholic clergy, the article examines strategies, processes and mechanisms of emotionalization. The focus is on the content of petitions from bishop Inochentie Micu-Klein and...

Data from: Dinosaurian survivorship schedules revisited: new insights from an age-structured population model

Eva Maria Griebeler
Little is known on dinosaur population biology due to insufficient information on age-dependent fecundities and mortalities. So far, survivorship curves (hereafter SC) of only six dinosaurs (four tyrannosaurs, one ceratopsian, one hadrosaur) were erected from bone assemblages of aged specimens. They indicate high survival throughout most of their life with presumable higher mortalities after hatching and increasing mortalities towards its end. However, all studies ignored that assemblages must preserve stationary age distributions (i.e., the population’s...

Vielfaltssicherung im Zeitalter von Medienintermediären

Birgit Stark & Daniel Stegmann
Vielfalt ist unerlässlich für die demokratische Meinungsbildung. Idealtypisch liefern die Medien vielfältige Informationen und Meinungen zu relevanten gesellschaftspolitischen Themen, auf deren Grundlage sich die Bürgerinnen und Bürger eine eigene, fundierte Meinung bilden können. Medienpolitisch gilt es daher zu verhindern, dass bestimmte Gruppen oder einzelne Personen einen zu mächtigen Einfluss auf die Meinungsbildung erhalten. Das Arbeitspapier reflektiert aus Sicht der Kommunikationswissenschaft das multidimensionale Konzept der publizistischen Vielfalt und konkretisiert seine demokratietheoretische Verankerung, leitet aus öffentlichkeitstheoretischen Überlegungen...

Implications of Asymmetry Risk for Portfolio Analysis and Asset Pricing

Fousseni Chabi-Yo, Dietmar Leisen & Eric Renault
Asymmetric shocks are common in markets; securities' payoffs are not normally distributed and exhibit skewness. This paper studies the portfolio holdings of heterogeneous agents with preferences over mean, variance and skewness, and derives equilibrium prices. A three funds separation theorem holds, adding a skewness portfolio to the market portfolio; the pricing kernel depends linearly only on the market return and its squared value. Our analysis extends Harvey and Siddique's (2000) conditional mean-variance-skewness asset pricing model...

European Sempervivum tectorum soil pH and iButton soil temperature time series measurement raw data.

Armin Georg Fabritzek, Eva Maria Griebeler & Joachim W. Kadereit
Ecogeographical displacement of homoploid hybrid lineages from their parents is well documented and considered an important mechanism to achieve reproductive isolation. In this study, we investigated the origin of the flowering plant species Sempervivum tectorum in the Massif Central (France) through homoploid hybridization between lineages of the species from the Rhine Gorge area (Germany) and the Pyrenees (France). We used genotyping-by-sequencing genetic data as evidence for the hybrid origin of the Massif Central lineage, and...

Die thrakische Hafenstadt Ainos. Ergebnisse eines interdisziplinären Forschungsprojektes

Thomas Schmidts, Sait Başaran, Andreas Bolten, Helmut Brückner, Heike Bücherl, Anja Cramer, Anca Dan, Martin Dennert, Ercan Erkul, Guido Heinz, Mustafa Koçak, Anna Pint, Martin Seeliger, Ioannis Triantafillidis, Dennis Wilken & Tina Wunderlich
Der Beitrag fasst die Ergebnisse eines von der Deutschen Forschungsgemeinschaft (DFG) im Rahmen des SPP 1630 von 2012 bis 2018 geförderten Projekts zusammen. Während der Feldkampagnen wurden archäologische, baugeschichtliche, geoarchäologische und geophysikalische Untersuchungen durchgeführt. Der Fokus der Untersuchungen lag auf der topographischen und wirtschaftlichen Entwicklung von Ainos in der Antike, insbesondere in der römischen Kaiserzeit, sowie in der byzantinischen Epoche. Neue Erkenntnisse konnten hinsichtlich der Entwicklung der Stadt und der Lokalisierung von möglichen Hafenstandorten erzielt...

Survival of workers and queens of the ant Temnothorax nylanderi depending on infection with the cestode Anomotaenia brevis

Susanne Foitzik
Parasites can mediate severe fitness costs and are thus important selective forces shaping the evolution of host phenotypes. Social insects are hosts for a diverse group of parasites, but their impact on the phenotypic traits of their social hosts is still poorly understood. Here, we tracked the survival of tapeworm-infected ant workers, their uninfected nestmates and of ants from unparasitized colonies. Our three-year study on the ant Temnothorax nylanderi, the intermediate host of the cestode...

Data from: Comparative transcriptomic analysis of the mechanisms underpinning ageing and fecundity in social insects

Judith Korb, Karen Meusemann, Denise Aumer, Abel Bernadou, Daniel Elsner, Barbara Feldmeyer, Susanne Foitzik, Jürgen Heinze, Romain Libbrecht, Silu Lin, Megha Majoe, José Manuel Monroy Kuhn, Volker Nehring, Matteo A. Negroni, Robert J. Paxton, Alice C. Séguret, Marah Stoldt & Thomas Flatt
Exceptional longevity of social insect queens despite their lifelong high fecundity remains poorly understood in ageing biology. To gain insights into the mechanisms that might underlie ageing in social insects, we compared gene expression patterns between young and old castes (both queens and workers) across different lineages of social insects (two termite, two bee and two ant species). After global analyses, we paid particular attention to genes of the insulin/insulin-like growth factor 1 signalling (IIS)/target...

Cytoplasmic incompatibility between Old and New World populations of a tramp ant

Çigdem Ün, Eva Schultner, Alejandro Manzano-Marín, Laura V. Flórez, Bernhard Seifert, Antonia Klein, Jürgen Heinze & Jan Oettler
Reproductive manipulation by endosymbiotic Wolbachia can cause unequal inheritance, allowing the manipulator to spread and potentially impacting evolutionary dynamics in infected hosts. Tramp and invasive species are excellent models to study the dynamics of host-Wolbachia associations because introduced populations often diverge in their microbiomes after colonizing new habitats, resulting in infection polymorphisms between native and introduced populations. Ants are the most abundant group of insects on earth, and numerous ant species are classified as highly...

Asymmetric allelic introgression across a hybrid zone of the coal tit (Periparus ater) in the central Himalayas

Martin Päckert, Hannes Wolfgramm, Jochen Martens, Till Töpfer, Melita Vamberger, Abhinaya Pathak & Heiko Stuckas
In the Himalayas, a number of secondary contact zones have been described for vicariant vertebrate taxa. However, analyses of genetic divergence and admixture are missing for most of these examples. In this study, we provide a population genetic analysis for the coal tit (Periparus ater) hybrid zone in Nepal. Intermediate phenotypes between the distinctive western ‘spot-winged tit’ (P. a. melanolophus) and eEastern Himalayan coal tits (P. a. aemodius) occur across a narrow range of less...

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Affiliations

  • Johannes Gutenberg University of Mainz
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  • University of Regensburg
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  • University of Münster
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  • Universität zu Köln
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  • Zoological Research Museum Alexander Koenig
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  • Antalya Bilim Üniversitesi
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  • University of North Carolina at Chapel Hill
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  • CNRS-Paris Sciences Lettres
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  • Senckenberg Natural History Collections Dresden
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  • Senckenberg Biodiversity and Climate Research Centre
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