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Université de Fribourg

The influence of ant-attendance on aphid behaviour investigated with the electrical penetration graph technique

Rauch, Gisep ; Simon, Jean-Christophe ; Chaubet, Bernard ; Haack, Lucie ; Flatt, Thomas ; Weisser, Wolfgang W.

In: Entomologia Experimentalis et Applicata, 2002, no. 102, p. 13-20

For themutualistic interaction between the aphidMetopeurum fuscoviride Stroyan (Homoptera:Aphididae) and the ant Lasius niger L. (Hymenoptera: Formicidae) it has been shown that ant-tended aphids develop faster, reproduce at a higher rate, and live longer than aphids not tended by ants. We used electrical penetration graphs (EPG) to investigate if behavioural patterns differ between ant-tended...

Université de Neuchâtel

Adjustments of levels of cooperation in cleaner wrasse "Labroides dimidiatus" : the effects of an audience and satiation

Pinto, Ana Isabel ; Bshary, Redouan (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

La coopération, soit l’entraide entre individus sans lien de parenté, est une énigme évolutive. Cela est dû au fait que l’aide est souvent un investissement qui doit générer des avantages futurs pour pouvoir faire l’objet d’une sélection positive. Généralement, la sélection naturelle favorise les individus qui adoptent un comportement égoïste. La tricherie devient donc une...

Université de Neuchâtel

What makes a cleaner a cleaner ?

Gingins, Simon ; Bshary, Redouan (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

In his last presidential address to the Royal Society in 2005, Robert M. May stated that “The most important unanswered question in evolutionary biology, and more generally in the social sciences, is how cooperative behaviour evolved and can be maintained”. My thesis provides a contribution to answering this big question by investigating how one particular species evolved for an ecology that...

Université de Neuchâtel

Indo-Pacific parrotfish exert partner choice in interactions with cleanerfish but Caribbean parrotfish do not

Soares, Marta C ; Cardoso, Sónia C ; Nicolet, Katia J ; Côté, Isabelle M ; Bshary, Redouan

In: Animal Behaviour, 2013, vol. 86, no. 3, p. 611-615

Cooperation theory puts a strong emphasis on partner control mechanisms that have evolved to stabilize cooperation against the temptation of cheating. The marine cleaning mutualism between the Indo-Pacific bluestreack cleaner wrasse, Labroides dimidiatus, and its reef fish ‘clients’ has been a model system to study partner control mechanisms and counterstrategies. These cleaners...

Université de Neuchâtel

Bacterial farming by the fungus Morchella crassipes

Pion, Martin ; Spangenberg, Jorge E ; Simon, Anaele ; Bindschedler, Saskia ; Flury, Coralie ; Chatelain, Auriel ; Bshary, Redouan ; Job, Daniel ; Junier, Pilar

In: Proceedings of the Royal Society B: Biological Sciences, 2013, vol. 280, no. 1173, p. 20132242

The interactions between bacteria and fungi, the main actors of the soil microbiome, remain poorly studied. Here, we show that the saprotrophic and ectomycorrhizal soil fungus Morchella crassipes acts as a bacterial farmer of Pseudomonas putida, which serves as a model soil bacterium. Farming by M. crassipes consists of bacterial dispersal, bacterial rearing with fungal...

Université de Neuchâtel

Cooperation and competition in two forest monkeys

Eckardt, Winnie ; Zuberbühler, Klaus

In: Behavioral Ecology, 2004, vol. 15, no. 3, p. 400-411

Putty-nosed monkeys, Cercopithecus nictitans stampflii, occur at various sites in West Africa, particularly in the transition zone between rainforest and savannah. The species is sometimes seen in primary rainforest, although at a curiously low density compared with that of other monkey species. We conducted a 24-month field study in the tropical rainforest of Taï National Park, Ivory...

Université de Fribourg

Differential allocation and deployment of direct and indirect defences by Vicia sepium along elevation gradients

Rasmann, Sergio ; Buri, Aline ; Gallot-Lavallée, Marie ; Joaquim, Jessica ; Purcell, Jessica ; Pellissier, Loïc

In: Journal of Ecology, 2014, p. -

Dissecting drivers of plant defence investment remains central for understanding the assemblage of communities across different habitats. There is increasing evidence that direct defence strategies against herbivores, including secondary metabolites production, differ along ecological gradients in response to variation in biotic and abiotic conditions. In contrast, intraspecific variation in...

Université de Neuchâtel

Mutualism, market effects and partner control

Johnstone, Rufus A. ; Bshary, Redouan

In: Journal of Evolutionary Biology, 2008, vol. 21, no. 3, p. 879-888

Intraspecific cooperation and interspecific mutualism often feature a marked asymmetry in the scope for exploitation. Cooperation may nevertheless persist despite one-sided opportunities for cheating, provided that the partner vulnerable to exploitation has sufficient control over the duration of interaction. The effectiveness of the threat of terminating an encounter, however, depends upon the...