78 Works

Timing uncertainty in collective risk dilemmas encourages group reciprocation and polarization

Elias Fernandez Domingos, Jelena Grujić, Francisco C. Santos, Juan C. Burguillo Rial, Georg Kirchsteiger, Francisco C. Santos & Tom Lenaerts
Social dilemmas are often shaped by actions involving uncertain returns only achievable in the future, such as climate action or voluntary vaccination. In this context, uncertainty may produce non-trivial effects. Here, we assess experimentally — through a collective risk dilemma — the effect of timing uncertainty, i.e. how uncertainty about when a target needs to be reached affects the participants’ behaviours. We show that timing uncertainty prompts not only early generosity but also polarised outcomes,...

Termite dispersal is influenced by their diet

Simon Hellemans, Jan Šobotník, Gilles Lepoint, Martin Mihaljevič, Yves Roisin & Thomas Bourguignon
Termites feed on vegetal matter at various stages of decomposition. Lineages of wood- and soil-feeding termites are distributed across terrestrial ecosystems located between 45°N and 45°S of latitude, a distribution they acquired through many transoceanic dispersal events. While wood-feeding termites often live in the wood on which they feed and are efficient at dispersing across oceans by rafting, soil-feeders are believed to be poor dispersers. Therefore, their distribution across multiple continents requires an explanation. Here,...

Data from: Secure and secret cooperation in robot swarms

Eduardo Castelló Ferrer, Thomas Hardjono, Alex Pentland & Marco Dorigo
The importance of swarm robotics systems in both academic research and real-world applications is steadily increasing. However, to reach widespread adoption, new models that ensure the secure cooperation of large groups of robots need to be developed. This work introduces a method to encapsulate cooperative robotic missions in an authenticated data structure known as Merkle tree. With this method, operators can provide the "blueprint" of the swarm's mission without disclosing its raw data. In other...

Data from: Climatic niche lability but growth form conservatism in the African woody flora

Anaïs-Pasiphaé Gorel, Olivier J. Hardy, Gilles Dauby, Kyle G. Dexter, Ricardo A. Segovia, Kathy Steppe & Adeline Fayolle
Climatic niche evolution during the diversification of tropical plants has received little attention in Africa. To address this, we characterized the climatic niche of >4000 tropical African woody species, distinguishing two broad bioclimatic groups (forest vs. savanna) and six subgroups. We quantified niche conservatism versus lability at the genus level and for higher clades, using a molecular phylogeny of >800 genera. Although niche stasis at speciation is prevalent, numerous clades individually cover vast climatic spaces...

Data from: Reversion of antibiotic resistance in Mycobacterium tuberculosis by spiroisoxazoline SMARt-420

Nicolas Blondiaux, Martin Moune, Matthieu Desroses, Rosangela Frita, Marion Flipo, Vanessa Mathys, Karine Soetaert, Mehdi Kiass, Vincent Delorme, Kamel Djaout, Vincent Trebosc, Christian Kemmer, René Wintjens, Alexandre Wohlkönig, Rudy Antoine, Ludovic Huot, David Hot, Mireia Coscolla, Julia Feldmann, Sebastien Gagneux, Camille Locht, Priscille Brodin, Marc Gitzinger, Benoit Deprez, Nicolas Willand … & Alain R. Baulard
Antibiotic resistance is one of the biggest threats to human health globally. Alarmingly, multidrug-resistant and extensively drug-resistant Mycobacterium tuberculosis have now spread worldwide. Some key antituberculosis antibiotics are prodrugs, for which resistance mechanisms are mainly driven by mutations in the bacterial enzymatic pathway required for their bioactivation. We have developed drug-like molecules that activate a cryptic alternative bioactivation pathway of ethionamide in M. tuberculosis, circumventing the classic activation pathway in which resistance mutations have now...

Data from: Revisiting the measurement of anomie

Ali Teymoori, Jolanda Jetten, Brock Bastian, Amarina Ariyanto, Frédérique Autin, Nadia Ayub, Constantina Badea, Tomasz Besta, Fabrizio Butera, Rui Costa-Lopes, Lijuan Cui, Carole Fantini, Gillian Finchilesc, Lowell Gaertner, Mario Gollwitzer, Ángel Gómez, Roberto González, Ying Yi Hong, Dorthe Høj Jensen, Minoru Karasawa, Thomas Kessler, Olivier Klein, Marcus Lima, Tuuli Anna Mähönen, Laura Megevand … & Gillian Finchilescu
Sociologists coined the term "anomie" to describe societies that are characterized by disintegration and deregulation. Extending beyond conceptualizations of anomie that conflate the measurements of anomie as 'a state of society' and as a 'state of mind', we disentangle these conceptualizations and develop an analysis and measure of this phenomenon focusing on anomie as a perception of the 'state of society'. We propose that anomie encompasses two dimensions: a perceived breakdown in social fabric (i.e.,...

Data from: Rapid increase in dispersal during range expansion in the invasive ladybird Harmonia axyridis

Eric Lombaert, Arnaud Estoup, Benoît Facon, Benjamin Joubard, Jean-Claude Grégoire, Anaï Jannin, Aurélie Blin & Thomas Guillemaud
The evolutionary trajectories associated with demographic, genetic and spatial disequilibrium have become an issue of growing interest in population biology. Invasive species provide unique opportunities to explore the impact of recent range expansion on life-history traits, making it possible to test for a spatial arrangement of dispersal abilities along the expanding range, in particular. We carried out controlled experiments in laboratory conditions to test the hypothesis of an increase in dispersal capacity with range expansion...

Data from: Determinants of maternal near misses in Morocco: too late, too far, too sloppy?

Bouchra Assarag, Bruno Dujardin, Alexandre Delamou, Fatima-Zahra Meski & Vincent De Brouwere
Background: In Morocco, there is little information on the circumstances surrounding maternal near misses. This study aimed to determine the incidence, characteristics, and determinants of maternal near misses in Morocco. Method:A prospective case-control study was conducted at 3 referral maternity hospitals in the Marrakech region of Morocco between February and July 2012. Near-miss cases included severe hemorrhage, hypertensive disorders, and prolonged obstructed labor. Three unmatched controls were selected for each near-miss case. Three categories of...

Data from: Acute liver dysfunction after cardiac arrest

Enrica Iesu, Federico Franchi, Federica Zama Cavicchi, Selene Pozzebon, Vito Fontana, Manuel Mendoza, Leda Nobile, Sabino Scolletta, Jean-Louis Vincent, Jacques Creteur & Fabio Silvio Taccone
Few data are available regarding hypoxic hepatitis (HH) and acute liver failure (ALF) in patients resuscitated from cardiac arrest (CA). The aim of this study was to describe the occurrence of these complications and their association with outcome. All adult patients admitted to the Department of Intensive Care following CA were considered for inclusion in this retrospective study. Exclusion criteria were early death (<24 hours) or missing biological data. We retrieved data concerning CA characteristics...

Data from: Interspecific shared collective decision-making in two forensically important species

Julien Boulay, Jean Louis Deneubourg, Valéry Hédouin & Damien Charabidzé
To date, the study of collective behaviour has mainly focused on intraspecific situations: the collective decision-making of mixed-species groups involving interspecific aggregation-segregation has received little attention. Here, we show that, in both conspecific and heterospecific groups, the larvae of two species (Lucilia sericata and Calliphora vomitoria, calliphorid carrion-feeding flies) were able to make a collective choice. In all groups, the choice was made within a few minutes and persisted throughout the experiment period. The monitoring...

Data from: Characterization of new microsatellite loci isolated from Santiria trimera (Burseraceae)

Guillaume K. Koffi, Myriam Heuertz, Romain Jans, Olivier J. Hardy, Giovanni G. Vendramin & Jerome Duminil
PREMISE OF THE STUDY: To study the genetic structure among three morphotypes of an African rainforest tree species, Santiria trimera, nuclear microsatellite markers were isolated and characterized. METHODS AND RESULTS: Seven polymorphic loci were isolated using a pyrosequencing-based protocol. The seven loci were successfully amplified on three different morphotypes of S. trimera. For six of the seven loci, there is at least one private allele for one of the three morphotypes. The mean effective number...

Data from: Facultative asexual reproduction and genetic diversity of populations in the humivorous termite Cavitermes tuberosus

Denis Fournier, Simon Hellemans, Robert Hanus & Yves Roisin
Termite colonies are typically founded by a pair of sexually reproducing dispersers, which can sometimes be replaced by some of their offspring. Some Reticulitermes and Embiratermes species routinely practice asexual queen succession (AQS): the queen is replaced by neotenic daughters produced by parthenogenesis, which mate with the primary king. Here, to cast light on the evolution of AQS, we investigated another candidate species, Cavitermes tuberosus (Termitinae). Of 95 nests, 39 contained a primary queen and...

Robustness of consensus is independent from preference diversity among group members in the American cockroach (Periplaneta american)

Mariano Calvo Martín, Max Eeckhout, Jean-Louis Deneubourg & Stamatios Nicolis
Collective choices and consensus resulting from the competition of positive feedbacks, are the subject of numerous studies. However, how the interindividual diversity of preferences among the group members affects these dynamics is usually overlooked apart from vertebrates based studies. Gregarism is a useful model for studying how the interindividual diversity of preferences affects the collective choices and consensus. The decision-making of three types of groups of the cockroach Periplaneta americana is tested in a choice...

Estimating migration of the cold-tolerant leaf beetle Gonioctena quinquepunctata inside a mountain range in a spatially explicit context

Chedly Kastally, Simon Dellicour, Olivier J. Hardy, Marius Gilbert & Patrick Mardulyn
The cold-tolerant leaf beetle Gonioctena quinquepunctata displays a large but fragmented European distribution and is restricted to mountain regions in the southern part of its range. Using a RAD-seq-generated large SNP data set (> 10,000 loci), we investigated the geographic distribution of genetic variation within the Vosges mountains, where the species is common. To translate this pattern of variation in an estimate of its capacity to disperse, we simulated SNP data under a spatially explicit...

How did subterranean amphipods cross the Adriatic Sea? Phylogenetic evidence for the dispersal-vicariance interplay mediated by marine regression-transgression cycles

Teo Delić, Fabio Stoch, Spela Borko, Jean-Francois Flot & Cene Fišer
Aim: We tested the hypothesis that historical marine regression-transgression cycles shaped the distribution patterns of subterranean amphipods through repeated cycles of dispersal and vicariance against the hypothesis that subterranean amphipods colonized both sides of the Adriatic Sea independently. Location: Western Balkan Peninsula, Adriatic Sea Islands and Apennine Peninsula, Europe Taxon: A clade of freshwater subterranean amphipods, genus Niphargus (Crustacea: Amphipoda). Methods: The taxonomic structure of the studied clade was revised using unilocus species delimitations. Timeframe...

Diurnal foraging ant–tree co-occurrence networks are similar between canopy and understorey in a Neotropical rain forest

Reuber Antoniazzi, Jose Garcia-Franco, Milan Janda, Maurice Leponce & Wesley Dáttilo
Discussion of the vertical stratification of organisms in tropical forests has traditionally focused on species distribution. Most studies have shown that, due to differences in abiotic conditions and resource distribution, species can be distributed along the vertical gradient according to their eco-physiological needs. However, the network structure between distinct vertical strata remains little-explored. To fill this gap in knowledge, we used baits to sample ants in the canopy and understorey trees of a Mexican tropical...

Data from: The origin of the legumes is a complex paleopolyploid phylogenomic tangle closely associated with the Cretaceous-Paleogene (K-Pg) mass extinction event

Erik Koenen, Dario Ojeda, Freek Bakker, Jan Wieringa, Catherine Kidner, Olivier Hardy, Toby Pennington, Patrick Herendeen, Anne Bruneau & Colin Hughes
The consequences of the Cretaceous-Paleogene (K-Pg) boundary (KPB) mass extinction for the evolution of plant diversity remain poorly understood, even though evolutionary turnover of plant lineages at the KPB is central to understanding assembly of the Cenozoic biota. The apparent concentration of whole genome duplication (WGD) events around the KPB may have played a role in survival and subsequent diversification of plant lineages. To gain new insights into the origins of Cenozoic biodiversity, we examine...

Data from: Development of genomic tools in a widespread tropical tree, Symphonia globulifera L.f.: a new low-coverage draft genome, SNP and SSR markers

Sanna Olsson, Pedro Seoane Zonjic, Rocío Bautista, M. Gonzalo Claros, Santiago C. González-Martínez, Ivan Scotti, Caroline Scotti-Saintagne, Olivier J. Hardy & Myriam Heuertz
Population genetic studies in tropical plants are often challenging because of limited information on taxonomy, phylogenetic relationships and distribution ranges, scarce genomic information and logistic challenges in sampling. We describe a strategy to develop robust and widely applicable genetic markers based on a modest development of genomic resources in the ancient tropical tree species Symphonia globulifera L.f. (Clusiaceae), a keystone species in African and Neotropical rainforests. We provide the first low-coverage (11X) fragmented draft genome...

Data from: Towards the description of livestock mobility in Sahelian Africa: some results from a survey in Mauritania

Andrea Apolloni, Gaelle Nicolas, Caroline Coste, Ahmed Bezeid EL Mamy, Barry Yahya, Ahmed S. EL Arbi, Mohamed B. Gueya, Doumbia Baba, Marius Gilbert & Renaud Lancelot
Understanding spatio-temporal patterns of host mobility is a key factor to prevent and control animal and human diseases. This is utterly important in low-income countries, where animal disease epidemics have strong socio-economic impacts. In this article we analyzed a livestock mobility database, whose data have been collected by the Centre National d’Elevage et de Recherches Vétérinaires (CNERV) Mauritania, to describe its patterns and temporal evolution. Data were collected through phone and face-to-face interviews in almost...

Data from: Sperm production characteristics vary with level of sperm competition in Cataglyphis desert ants

Serge Aron, Pascale Lybaert, Claire Baudoux, Morgane Vandervelden & Denis Fournier
Under polyandry, males are selected to produce more competitive ejaculates. Theoretical models have explored how the mechanism of sperm competition drives males to partition investment within an ejaculate between sperm quantity and quality. The raffle-based competition model predicts that increased level of sperm competition selects for larger numbers of sperm in ejaculates. Sperm competition is also thought to promote the evolution of longer sperm, because longer sperm could be faster. In eusocial Hymenoptera, the mating...

IASI-FT spectrally resolved Outgoing Longwave Radiation (from IASI/Metop-A)

simon whitburn
The IASI spectrally resolved Outgoing Longwave Radiation product (IASI OLR) is a monthly (L3), 2 x 2 degree global dataset of spectral OLR derived from the clear-sky IASI satellite radiance measurements in the range 645-2300 cm-1 at the 0.25 cm-1 native spectral sampling of the L1C spectra. The algorithm for the conversion of the spectra to the OLR is detailed in Whitburn et al. (2020, Journal of Climate). It relies on precalculated angular distribution models...

Data from: Ocean warming and acidification alter the behavioural response to flow of the sea urchin Paracentrotus lividus

Mishal Cohen-Rengifo, Antonio Agüera, Tjeerd Bouma, Saloua M‘Zoudi, Patrick Flammang & Philippe Dubois
Ocean warming (OW) and acidification (OA) are intensively investigated as they pose major threats to marine organism. However, little effort is dedicated to another collateral climate change stressor, the increased frequency and intensity of storm events, here referred to as intensified hydrodynamics. A 2-month experiment was performed to identify how OW and OA (temperature: 21°C; pHT: 7.7, 7.4; control: 17°C-pHT7.9) affect the resistance to hydrodynamics in the sea urchin Paracentrotus lividus using an integrative approach...

Mitonuclear mismatch alters performance and reproductive success in naturally-introgressed populations of a montane leaf beetle

Nathan Rank, Nathan E Rank, Patrick Mardulyn, Sarah J Heidl, Kevin T Roberts, Nicolas A Zavala, John T Smiley & Elizabeth P Dahlhoff
Coordination between nuclear and mitochondrial genomes is critical to metabolic processes underlying animals' ability to adapt to local environments, yet consequences of mitonuclear interactions have rarely been investigated in populations where individuals with divergent mitochondrial and nuclear genomes naturally interbreed. Genetic variation in the leaf beetle Chrysomela aeneicollis was assessed along a latitudinal thermal gradient in California's Sierra Nevada. Variation at mitochondrial cytochrome oxidase II (COII) and the nuclear gene phosphoglucose isomerase (PGI) shows concordance...

Whole-genome sequencing reveals asymmetric introgression between two sister species of cold-resistant leaf beetles

Svitlana Lukicheva & Patrick Mardulyn
A large number of genetic variation studies have identified cases of mitochondrial genome introgression in animals, indicating that reproductive barriers among closely related species are often permeable. Because of its sheer size, the impact of hybridization on the evolution of the nuclear genome is more difficult to apprehend. Only a few studies have explored it recently thanks to recent progresses in DNA sequencing and genome assembly. Here, we analysed whole-genome sequence variation among multiple individuals...

Data from: Arthropod diversity in a tropical forest

Yves Basset, Lukas Cizek, Philippe Cuénoud, Raphael K. Didham, François Guilhaumon, Olivier Missa, Vojtech Novotny, Frode Ødegaard, Tomas Roslin, Jürgen Schmidl, Alexey K. Tishechkin, Neville N. Winchester, David W. Roubik, Henri-Pierre Aberlenc, Johannes Bail, Héctor Barrios, Jon R. Bridle, Gabriela Castaño-Meneses, Bruno Corbara, Gianfranco Curletti, Wesley Duarte Da Rocha, Domir De Bakker, Jacques H. C. Delabie, Alain Dejean, Laura L. Fagan … & Maurice Leponce
Most eukaryotic organisms are arthropods. Yet, their diversity in rich terrestrial ecosystems is still unknown. Here we produce tangible estimates of the total species richness of arthropods in a tropical rainforest. Using a comprehensive range of structured protocols, we sampled the phylogenetic breadth of arthropod taxa from the soil to the forest canopy in the San Lorenzo forest, Panama. We collected 6,144 arthropod species from 0.48 ha and extrapolated total species richness to larger areas...

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