11 Works

High spatial resolution mapping identifies habitat characteristics of the invasive vine Antigonon leptopus on St. Eustatius (Lesser Antilles)

Elizabeth Haber, Maria Santos, Pedro Leitão, Marcel Schwieder, Pieter Ketner, Joris Ernst, Max Rietkerk, Martin Wassen & Maarten Eppinga
On the Caribbean island of St. Eustatius, Coralita (Antigonon leptopus) is an aggressive invasive vine posing major biodiversity conservation concerns. The generation of distribution maps can address these conservation concerns by helping to elucidate the drivers of invasion. We test the use of support vector machines to map the distribution of Coralita on St. Eustatius at high spatial resolution and use this map to identify potential landscape and geomorphological factors associated with Coralita presence. This...

Life-cycle complexity in helminths: What are the benefits?

Daniel Benesh, Geoff A. Parker & James C Chubb
Parasitic worms (i.e. helminths) commonly infect multiple hosts in succession. With every transmission step, they risk not infecting the next host and thus dying before reproducing. Given this risk, what are the benefits of complex life cycles? Using a dataset for 973 species of trophically transmitted acanthocephalans, cestodes, and nematodes, we tested whether hosts at the start of a life cycle increase transmission and whether hosts at the end of a life cycle enable growth...

The inner mechanics of rhodopsin guanylyl cyclase during cGMP-formation revealed by real-time FTIR spectroscopy

Paul Fischer, Shatanik Mukherjee, Enrico Peter, Matthias Broser, Franz Bartl & Peter Hegemann
Enzymerhodopsins represent a recently discovered class of rhodopsins which includes histidine kinase rhodopsin, rhodopsin phosphodiesterases and rhodopsin guanylyl cyclases (RGCs). The regulatory influence of the rhodopsin domain on the enzyme activity is only partially understood and holds the key for a deeper understanding of intra-molecular signaling pathways. Here we present a UV-Vis and FTIR study about the light-induced dynamics of a RGC from the fungus Catenaria anguillulae, which provides insights into the catalytic process. After...

Comparative analysis of helminth infectivity: growth in intermediate hosts increases establishment rates in the next host

Daniel Benesh, Spencer Froelick & Laura Gramolini
Parasitic worms (i.e. helminths) commonly infect multiple hosts in succession before reproducing. At each life cycle step, worms may fail to infect the next host, and this risk accumulates as life cycles include more successive hosts. Risk accumulation can be minimized by having high establishment success in the next host, but comparisons of establishment probabilities across parasite life stages are lacking. We compiled recovery rates (i.e. the proportion of parasites recovered from an administered dose)...

Rear-edge populations are important for understanding climate change risk and adaptation potential of threatened species

Tobias Kuemmerle, Nader Habibzadeh, Benjamin Bleyhl & Arash Ghoddousi
Climate change disproportionately threatens alpine species, by reducing available habitat and by isolating their populations. These pressures are particularly relevant for rear-edge populations, which typically occupy more marginal habitat compared to populations at the core of species’ ranges. We studied Caucasian grouse Lyrurus mlokosiewiczi in the Caucasus ecoregion, a global biodiversity hotspot where this species is endemic, to understand potential climate change impacts on the species. Specifically, we assessed how climate change impacts rear-edge populations...

Self-organization and information transfer in Antarctic krill swarms

Ashley Ward, Alicia Burns, Timothy Schaerf, Joseph Lizier, So Kawaguchi, Martin Cox, Rob King & Jens Krause
Antarctic krill swarms are one of the largest known animal aggregations, and yet, despite being the keystone species of the Southern Ocean, little is known about how swarms are formed and maintained. Understanding the local interactions between individuals that provide the basis for these swarms is fundamental to knowing how swarms arise in nature, and what potential factors might lead to their breakdown. Here we analyzed the trajectories of captive, wild-caught krill in 3D to...

Acoustic and visual stimuli combined promote stronger responses to aerial predation in fish

Juliane Lukas, Pawel Romanczuk, Haider Klenz, Pascal Klamser, Lenin Arias-Rodriguez, Jens Krause & David Bierbach
Bird predation poses a strong selection pressure on fish. Since birds must enter the water to catch fish, a combination of visual and mechano-acoustic cues (multimodal) characterize an immediate attack, while single cues (unimodal) may represent less dangerous disturbances. We investigated whether fish could use this information to distinguish between non-threatening and dangerous events and adjust their anti-predator response to the perceived level of risk. To do so, we investigated the anti-predator behavior of the...

Rewetting does not return drained fen peatlands to their old selves

Juergen Kreyling, Franziska Tanneberger, Florian Jansen, Sebastian Van Der Linden, Camiel Aggenbach, Volker Blüml, John Couwenberg, Willem-Jan Emsens, Hans Joosten, Agatha Klimkowska, Wiktor Kotowski, Lukasz Kozub, Bernd Lennartz, Yvonne Liczner, Haojie Liu, Dierk Michaelis, Claudia Oehmke, Karsten Parakenings, Elisabeth Pleyl, Arne Poyda, Stefanie Raabe, Markus Röhl, Kirsten Rücker, Anett Schneider, Joachim Schrautzer … & Gerald Jurasinski
Peatlands, in particular groundwater-fed fens of the temperate zone, have been drained for agriculture, forestry and peat extraction for a long time and on a large scale. Drainage turns peatlands from a carbon and nutrient sink into a respective source, diminishes water regulation capacity at the landscape scale, causes continuous surface height loss and destroys their typical biodiversity. Over the last decades, drained peatlands have been rewetted for biodiversity restoration and, as it strongly decreases...

Maps of forest-smallholder homesteads in the Chaco at 10x10km² spatial resolution (1985-2015)

Christian Levers, Alfredo Romero-Muñoz, Matthias Baumann, Teresa De Marzo, Pedro David Fernández, Nestor Ignacio Gasparri, Gregorio Ignacio Gavier-Pizarro, Yann Le Polain De Waroux, María Piquer-Rodríguez, Asunción Semper-Pascual & Tobias Kuemmerle
The data contained in the three ZIP files represents the following information on smallholder homestead distribution and dynamics across the Gran Chaco ecoregion: - presence of smallholder homesteads for target years in five-year intervals between 1985 and 2015 [% per grid cell] - net loss of smallholder homesteads between five-year intervals between 1985 and 2015 [% per grid cell] - net gain of smallholder homesteads between five-year intervals between 1985 and 2015 [% per grid...

Intensity of infection with intracellular Eimeria spp. and pinworms is reduced in hybrid mice compared to parental subspecies

Alice Balard, Víctor Hugo Jarquín‐Díaz, Jenny Jost, Iva Martincová, Ľudovít Ďureje, Jaroslav Piálek, Miloš Macholán, Joëlle Goüy De Bellocq, Stuart J. E. Baird & Emanuel Heitlinger
Genetic diversity in animal immune systems is usually beneficial. In hybrid recombinants, this is less clear, as the immune system could also be impacted by genetic conflicts. In the European house mouse hybrid zone, the longstanding impression that hybrid mice are more highly parasitized and less fit than parentals persists despite the findings of recent studies. Working across a novel transect we assessed infections by intracellular protozoans, Eimeria spp., and infections by extracellular macroparasites, pinworms....

Sex-specific speed-accuracy tradeoffs shape neural processing of acoustic signals in a grasshopper

Jan Clemens, Bernhard Ronacher & Michael Reichert
Speed-accuracy tradeoffs – being fast at the risk of being wrong – are fundamental to many decisions and natural selection is expected to resolve these tradeoffs according to the costs and benefits of behavior. We here test the prediction that females and males should integrate information from courtship signals differently because they experience different payoffs along the speed-accuracy continuum. We fitted a neural model of decision making (a drift-diffusion model of integration to threshold) to...

Registration Year

  • 2021

Resource Types

  • Dataset


  • Humboldt University of Berlin
  • Humboldt-Universität zu Berlin
  • University of Antwerp
  • University of Greifswald
  • Technische Universität Braunschweig
  • Institute of Animal Physiology and Genetics
  • Aarhus University
  • Oklahoma State University
  • Leibniz Institute of Freshwater Ecology and Inland Fisheries
  • McGill University