dr. SA (Stefan) Geisen

dr. SA (Stefan) Geisen

Assistant Professor

Research conducted by the Laboratory of Nematology is part of the research program of the Graduate School Experimental Plant Sciences (EPS) and the C.T. de Wit Graduate School for Production Ecology & Resource Conservation (PE&RC).


I am a molecular ecologist who focuses on the interactions of microbiome predators (protists and nematodes) with their bacterial and fungal prey. I want understand the functional implication of these interactions such as on the performance of plants, greenhouse gas emissions and other soil functions.

I am generally also interested in understanding the drivers of microbiome predator communities in soils and the resulting change in their function. For that, I am optimizing techniques to better study these organisms particularly focusing on metabarcoding (high-throughput amplicon sequencing) but also other techniques to estimate their abundances and biomasses.

Also other soil organisms are in the scope of my research to eventually get a more complete understanding of the biodiversity in soils.

Research group:

  • Alejandro Berlinches de Gea
  • Wenjia Wu