- Agency
- University of Fribourg
- Location
- Switzerland
- Job Category
- Faculty Appointments
- Start Date
- May 1, 2019
- Website
- https://entojobs.tamu.edu/wp-content/uploads/sites/79/2019/01/PhD-position_Effects-of-pathogen-pressure-on-personal-and-social-immune-investment-in-ants.pdf
- Description
- A 4-year PhD position is available in the research group of Professor Nathalie Stroeymeyt in the Department of Biology, University of Fribourg, to study the effect of group composition on disease transmission and relative investment in personal vs. social immunity in ants. Background Group living offers favourable conditions for the spread of infectious diseases, because high population densities and frequent social contacts facilitate pathogen transmission. To mitigate that risk, social animals have evolved a variety of defence mechanisms to prevent the entry and propagation of pathogens within the group, ranging from a raised investment in personal immunity to highly coordinated collective sanitary actions (‘social immunity’). Recent studies have shown that social groups can also adopt organizational features, such as the subdivision into well-separated subgroups, which reduce epidemic risk through transmission bottleneck effects. However, the importance of organizational immunity features in disease risk management by real animal groups is still poorly understood. Our research adopts an empirical approach based on the experimental manipulations of garden ant colonies (Lasius niger) to (i) quantify the effect of social organization on disease transmission and test key predictions from network epidemiology, and (ii) evaluate the relative of importance of personal immunity, collective sanitary actions and organizational features under different environmental conditions and at different stages of development (for more detail see https://stroeymeyt-lab.ch/research). The project The goal of this PhD project will be to investigate how group composition (in particular colony size) influences the social network topology of ant colonies, and how this in turn affects disease transmission risk and the need for individuals to invest in personal immunity. The project will rely on automated behavioural tracking, social network analysis, simulation of disease transmission, monitoring of the transmission of pathogenic and non-pathogenic agents, fitness measurements, physiological assays and immune gene expression analysis. Among others, the project will address general hypotheses about the effect of group size on social organisation ('size-complexity’ hypothesis) and immune investment (‘density-dependent prophylaxis’).
- Qualifications
- We are looking for candidates with experience in quantitative behavioural analysis and programming, a good working knowledge in statistics and experimental design, and a willingness to apply a variety of approaches (behavioural tracking, writing own code to analyse the data, and lab work). Experience with social insects, insect immunity and/or molecular biology would be a plus. Candidates must be creative, motivated and passionate about science, have excellent oral and written communication skills, and be at ease working both independently and as part of a team. A Master’s degree (or equivalent) will be required prior to taking up the position.
- Job Number
- 79
- Contact Person
- Nathalie Stroeymeyt
- Contact eMail
- Nathalie.Stroeymeyt@gmail.com