Project Title: Context dependent effects on protective symbiosis driven by predation, competition
and parasitism
Project Description:
Symbiosis is a biological interaction which refers to the physical
association of individuals from different species that can be positive,
negative or neutral to either species. In planktonic systems several
symbiotic interactions can occur simultaneously and can interact with
each other. We want to study the symbiosis between Daphnia and the
rotifer Brachionus rubens within a multi-species interaction web. B.
rubens can attach to Daphnia which reduces the fitness of Daphnia. At
the same time both species compete for resources (algae). The
attachment becomes more relevant, when a predator of B. rubens, A.
brighwelli (another rotifer) is present because attached B. rubens are
protected from predation. The aim is to quantify the costs and benefits for Brachionus and Daphnia under varying
conditions and to better understand symbioses in a community context. Thus, the present project will contribute
to a new food web theory which includes density dependence of symbioses. In addition, video analyses will be
performed to study the attachment process in more detail.
In the case of final approval, the project is embedded into a network of several experimental and theoretical
working groups across Germany conducting regular workshops and meetings. The prospective PhD student will
join the working group of apl. Prof. Dr. Guntram Weithoff at the University of Potsdam. We provide an active
research environment covering a broad range in ecological research. Beyond that, the Potsdam Graduate School
(PoGS) offers a broad program on interdisciplinary training in soft skills and early career development.
Your qualification: MSc degree in Ecology preferably in Aquatic Ecology or a related field. We are looking for
a motivated candidate with good experimental skills. Further relevant skills are: sound knowledge in conceptional
ecology, statistics and very good English in writing and communication
Application: To apply, please send the following documents as a single PDF to weithoff@uni-potsdam.de (the
position is open until it is filled)
• Cover letter, including a statement of motivation and from when on you would be available
• Curriculum vitae including information on relevant skills
• Certificates of education
• If possible, provide letters of recommendation from previous supervisors