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...

Université de Fribourg

A simple in vitro method to study interactions between soil insects, entomopathogenic fungi, and plant extracts

Eckard, Sonja ; Bacher, Sven ; Enkerli, Jürg ; Grabenweger, Giselher

In: Entomologia Experimentalis et Applicata, 2017, vol. 163, no. 3, p. 315–327

A combined application of a biological control agent, such as an entomopathogenic fungus (EPF), with other means of pest control may lead to enhanced or more reliable efficacy of the biocontrol agent. Ideally, the combined components would interact synergistically, yielding significantly higher mortality of the target pest. The mode of such interactions is often unclear and particularly...

Université de Fribourg

Reduced learning ability as a consequence of evolutionary adaptation to nutritional stress in Drosophila melanogaster

Kolss, Munjong ; Kawecki, Tadeusz J.

In: Ecological Entomology, 2008///doi:10.1111/j.1365-2311.2008.01007.x

Abstract. 1. Dietary conditions affect cognitive abilities of many species, but it is unclear to what extent this physiological effect translates into an evolutionary relationship.2. A reduction of competitive ability under nutritional stress has been reported as a correlated response to selection for learning ability in Drosophila melanogaster. Here we test whether the reverse holds as well,...

Université de Fribourg

CD81-induced behavioural changes during chronic cocaine administration: in vivo gene delivery with regulatable lentivirus

Bahi, Amine ; Boyer, Frederic ; Kafri, Tal ; Dreyer, Jean-Luc

In: European Journal of Neuroscience, 2004, vol. 19, p. 1621-1633

CD81, a tetraspanin transmembrane protein involved in cell adhesion, is up-regulated in the mesolimbic dopaminergic pathway 24 h following acute administration of high doses of cocaine [Brenz-Verca et al., (2001) Mol. Cell. Neurosci., 17, 303-316]. Further evidence consecutive with this observation and based on microarray analysis are presented here. In addition, a regulatable lentivirus was...