Data and files for: Decoupling cooperation and punishment in humans shows that punishment is not an altruistic traitMaxwell Burton-Chellew & Claire Guerin
Economic experiments have suggested that cooperative humans will altruistically match local levels of cooperation (‘conditional cooperation’) and pay to punish non-cooperators (‘altruistic punishment’). Evolutionary models have suggested that if altruists punish non-altruists this could favour the evolution of costly helping behaviours (cooperation) among strangers. An often-key requirement is that helping behaviours and punishing behaviours form one single, conjoined trait (‘strong reciprocity’). Previous economics experiments have provided support for the hypothesis that punishment and cooperation form...
Importance of melanin-based colouration and environment in shaping intracellular glutathione levels in nestling and adult tawny owls (Strix aluco)Guillaume Emaresi, Pierre Bize & Alexandre Roulin
Resources allocated in reproduction are traded off against those invested in self-maintenance such as antioxidant response. Glutathione (GSH) is an intracellular antioxidant defence that scavenges reactive oxygen species, the deleterious byproducts of oxygen consumption. Given the role of intracellular GSH in pheomelanogenesis, a trade-off in GSH allocation between resistance to oxidative stress and melanin production may take place. To investigate how intracellular GSH is regulated in differently coloured individuals at the time of reproduction (in...
A major goal of invasion biology is to understand global species flows between donor and recipient regions. Our current view of such flows assumes that species are moved directly from their native to their introduced range. However, if introduced populations serve as bridgehead population that generate additional introductions, tracing intercontinental flows between donor and recipient regions misrepresents the introduction history. Our aim was to assess to what extent bridgehead effects distort our view of global...
Data and experiment files from: Payoff-based learning best explains the rate of decline in cooperation across 237 public-goods gamesMaxwell Burton-Chellew & Stuart West
What motivates human behaviour in social dilemmas? The results of public goods games are commonly interpreted as showing that humans are altruistically motivated to benefit others. However, there is a competing ‘confused learners’ hypothesis: that individuals start the game either uncertain or mistaken (confused), and then learn from experience how to improve their payoff (payoff-based learning). We: (1) show that these competing hypotheses can be differentiated by how they predict contributions should decline over time;...
Relatedness underlies the evolution of reproductive altruism, yet eusocial insect colonies occasionally accept unrelated reproductive queens. Why would workers living in colonies with related queens accept unrelated ones, when they do not gain indirect fitness through their reproduction? To understand this seemingly paradox, we investigated whether acceptance of unrelated queens by workers is an incidental phenomenon resulting from failure to recognize non-nestmate queens, or whether it is adaptively favored in contexts where cooperation is preferable...
University of Lausanne30
Grenoble Alpes University3
Swiss Federal Institute of Technology in Zurich3
École Polytechnique Fédérale de Lausanne2
University of Copenhagen2
French Research Institute for Exploitation of the Sea2
South African National Biodiversity Institute1
Centre d'Ecologie Fonctionnelle et Evolutive1
University of Würzburg1
Field Museum of Natural History1