physiology; behavioural ecology; cooperation; cognition; modelling; mutualism
N Truskanov, Y Emery, R Bshary (2020), Juvenile cleaner fish can socially learn the consequences of cheating., in Nature communications
TrikiZegni, BsharyRedouan (2020), Long‐term memory retention in a wild fish species Labroides dimidiatus eleven months after an aversive event, in Ethology
, 126, 372.
Demairé Camille, Triki Zegni, Binning Sandra A., Glauser GaÃ«tan, Roche Dominique G., Bshary Redouan (2020), Reduced access to cleaner fish negatively impacts the physiological state of two resident reef fishes, in Marine Biology
, 167(4), 1.
AE Quiñones, O Leimar, A Lotem, R Bshary (2020), Reinforcement Learning Theory Reveals the Cognitive Requirements for Solving the Cleaner Fish Market Task., in The American naturalist
Triki Zegni, Wismer Sharon, Rey Olivia, Binning Sandra Ann, Levorato Elena, Bshary Redouan (2019), Biological market effects predict cleaner fish strategic sophistication, in Behavioral Ecology
, 30(6), 1548-1557.
AS Grutter, SP Blomberg, S Box, R Bshary, O Ho, EMP Madin, EC McClure, MG Meekan, JM Murphy, MA Richardson, PC Sikkel, CA Sims, D Sun, RR Warner (2019), Changes in local free-living parasite populations in response to cleaner manipulation over 12 years., in Oecologia
Wismer Sharon, Pinto Ana I., Triki Zegni, Grutter Alexandra S., Roche Dominique G., Bshary Redouan (2019), Cue-based decision rules of cleaner fish in a biological market task, in Animal Behaviour
, 158, 249-260.
R Mazzei, M Lampe, A Ohnesorge, A Pajot, MC Soares, R Bshary (2019), Ecological differences in the facultative Caribbean cleaning goby Elacatinus prochilos do not predict learning performance in discriminatory two-choice tasks., in Animal cognition
Z Triki, R Bshary (2019), Fluctuations in coral reef fish densities after environmental disturbances on the northern Great Barrier Reef., in PeerJ
Z Triki, E Levorato, W McNeely, J Marshall, R Bshary (2019), Population densities predict forebrain size variation in the cleaner fish Labroides dimidiatus., in Proceedings. Biological sciences
Raihani Nichola J., Bshary Redouan (2019), Punishment: one tool, many uses, in Evolutionary Human Sciences
, 1, e12.
MC Soares, R Mazzei, SC Cardoso, C Ramos, R Bshary (2019), Testosterone causes pleiotropic effects on cleanerfish behaviour., in Scientific reports
JR Paula, M Baptista, F Carvalho, T Repolho, R Bshary, R Rosa (2019), The past, present and future of cleaner fish cognitive performance as a function of CO2 levels., in Biology letters
SA Binning, DG Roche, AS Grutter, S Colosio, D Sun, J Miest, R Bshary (2018), Cleaner wrasse indirectly affect the cognitive performance of a damselfish through ectoparasite removal., in Proceedings. Biological sciences
S Gingins, F Marcadier, S Wismer, O Krattinger, F Quattrini, R Bshary, SA Binning (2018), The performance of cleaner wrasse, Labroides dimidiatus, in a reversal learning task varies across experimental paradigms., in PeerJ
The evolution and maintenance of cooperation for direct fitness benefits is a topic of great interdisciplinary interest. Existing game theoretic models typically assume either that genes code directly for a strategy, or that gene-environment interactions lead to conditional strategies. However, in organisms with more complex central nervous systems, a different scenario becomes increasingly important: gene-environment interactions affect brain development, and individuals will use their brain to make decisions based on learning, memory and experience. Decision-making in the brain is also influenced by information sent by the body: for instance, through the production of hormones. It is such processes that may cause many of the ubiquitously observed inter-species and inter-individual variation in levels of cooperation that is poorly explained by current models. In order to advance evolutionary questions about cooperation, we hence need to first understand how differences in personal experience, cognition, and physiology influence variation in cooperative interactions. In my current SNF grant, we have collected various data sets that will allow a more informed theoretical approach that explicitly includes physiological and cognitive mechanisms. In the bonus-of-excellence prolongation, we will continue this line of research with some adjustments. First, while recently started with the modelling, the BoE will put strong emphasis on it with a three-year post doc position. Models will address both decision rules that develop over the lifetime of individuals and evolutionary changes of strategies. Second, we have developed the tools to study aspects and effects of social decision making on the brain level, i.e. via gene expression in the social decision-making network, neurohormone receptor distributions and also anatomical features like size and cell density of particular nuclei. We will continue to increase our knowledge on these aspects. Finally, while the current grant focusses on the cleaner wrasse Labroides dimidiatus, we will broaden the empirical study systems. As before, we will compare L. dimidiatus cooperation, cognition and physiology to other wrasse species. As new additions, we study Caribbean cleaning gobies of the genus Elacatinus, a clade that has evolved specialised cleaning independently of wrasses. Goby cleaning strategies differ from those of wrasses, and the intraspecific variation is enormous, ranging from virtually no cleaning to obtaining almost all food from cleaning. Thus, information about their behaviour, cognition and physiology will be interesting for a comparative approach and because of its own specific features. A separate line of research involves the endocrinology of life history and social decisions in vervet monkeys. We started producing a rather unique data set in primatology, which includes regular measures of life history hormones (testosterone and cortisol) and neurohormones involved in social decision making (oxytocin and vasopressin). The current correlational data will be complemented with experiments in which we manipulate social interactions. The results can be used to model the evolution of (neuro)hormone functions in intra- and interspecific social behaviour when compared to the fish data, and/or to develop models that have a life history component to them. In conclusion, the aim of the BoE grant is to produce a great variety of empirical data on physiological and cognitive mechanisms that underlie social decision making as food for thought for our ontogenetic and evolutionary models of cooperation.