Offre de thèse : Organic geochemistry and paleolimnology (Basel)

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The Department of Environmental Sciences, University of Basel invites applications for a PhD position in the field of organic geochemistry and paleolimnology. The student will be part of a project developing and applying novel organic geochemical proxies of past algal productivity and ecological function in lacustrine environments. Research is planned in collaboration with scientists from Eawag, Switzerland (Department of Surface Waters – Research and Management) and the State University of New York at Buffalo, USA (Department of Geology). The abundance and distribution of different types of microalgae impact carbon cycling, water quality, and aquatic food webs. One of the best ways to understand and predict how algae will respond to future perturbations to aquatic environments is to analyze the ways they have reacted to the diverse conditions that have existed over geologic time. As a consequence, we must rely on indirect indicators – proxies – of past ecologic and environmental change. This PhD project aims to apply novel proxies based on algal lipid biomarkers and their stable isotopic composition to record changes in algal biodiversity caused by both natural variability and human activities, with a particular focus on the environmental impacts of ancient Roman settlements. Towards this goal, the PhD student will analyse sedimentary records spanning the past ~15000 years from lakes in Switzerland and New York state. The PhD student will participate in fieldtrips to collect sediment cores from lakes in the Swiss Plateau and in central New York. The project involves extensive laboratory work with a focus on biomarker purification and stable isotope analyses. Depending on the interests and background of the student, they will also have the opportunity to analyze ancient algal DNA from sediments.

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