In general, my research is concerned with the origin, maintenance and change of genetic diversity of natural populations and the drivers acting on this diversity.
During my PhD studies I focused on the population genetic structure of three species belonging to the Daphnia longispina complex and inferred general patterns for each taxon. My future studies shall additionally encompass interspecific relationships as these also may severely impact the genetic diversity of a species.

• Practical course "Microbiology" (M. Ed. Biology Secondary School; Module 10/11)
• Practical course "Genetics" (M. Ed. Biology Secondary School; Module 11)
• responsible for the modules M10/11 of the degree progam M. Ed. Biology Secondary School
• Laboratory tutorial (M. Ed. Biology Secondary School; Module 13)

• Pfenninger, M., H. Binde Doria, J. Nickel, A. Thielsch, K. Schwenk & M. Cordellier (2022) Spontaneous rate of clonal single nucleotide mutations in Daphnia galeata. PLoS ONE 17(4): e0265632. 
• van den Berg-Stein, S., H.J. Hahn, A. Thielsch & Schwenk, K. (2022) Diversity and dispersal of aquatic invertebrate species from surface and groundwater: Development and application of microsatellite markers for the detection of hydrological exchange processes. Water Research 210: 117956.
• van den Berg-Stein, S., A. Thielsch, K. Schwenk & H.J. Hahn (2019) StygoTracing – ein biologisches Tracerverfahren für Grund- und Trinkwasser - Erste Erfahrungen mit biologischen Tracern im Grund- und Trinkwasser auf unterschiedlichen räumlichen Skalen. Korrespondenz Wasserwirtschaft  12 (4): 217-223.
• Thielsch, A., A. Knell, A. Mohammadyari, A. Petrusek & K. Schwenk (2017) Divergent clades or cryptic lineages? Mito-nuclear discordance in a Daphnia species complex. BMC Evolutionary Biology 17: 227.
• Buhk, C. & A. Thielsch (2015) Hybridisation boosts the invasion of an alien species complex: insights into future invasiveness. Perspectives in Plant Ecology, Evolution and Systematics 17 (4): 274-283.
• Gergs, R., M. Koester, K. Grabow, F. Schöll, A. Thielsch & A. Martens (2015) Theodoxus fluviatilis' re-establishment in the River Rhine: a native relict or a cryptic invader? Conservation Genetics: 16 (1): 247-251.
• Thielsch, A., N. Glass, B. Streit, L. De Meester, R. Ortells & K. Schwenk (2015) Fitness differences and persistent founder effects determine the clonal composition during population build-up in Daphnia. Oikos 124 (5): 620-628.
• Feckler, A., J.P. Zubrod, A. Thielsch, K. Schwenk, R. Schulz & M. Bundschuh (2014) Cryptic species diversity: an overlooked factor in environmental management? Journal of Applied Ecology 51 (4): 958-967.
• Feckler, A., A. Thielsch, K. Schwenk, R. Schulz & M. Bundschuh (2012) Differences in the sensitivity among cryptic lineages of the Gammarus fossarum complex. Science of the Total Environment 439: 158-164.
• Petrusek, A., A. Thielsch & K. Schwenk (2012) Mitochondrial sequence variation suggests extensive cryptic diversity within the Western Palearctic Daphnia longispina complex. Limnology & Oceanography 57 (4): 1838-1845.
• Thielsch, A., E. Völker, R. H. S. Kraus & K. Schwenk (2012) Discrimination of hybrid classes using cross-species amplification of microsatellite loci: Methodological challenges and solutions in Daphnia. Molecular Ecology Resources 12 (4): 697-705.
• Dlouhá, Š., A. Thielsch, R. H. S. Kraus, J. Seda, K. Schwenk & A. Petrusek (2010) Identifying hybridizing taxa within the Daphnia longispina species complex: which methods to rely on? Hydrobiologia 643 (1): 107-122.
• Thielsch, A., A. Petrusek, N. Brede, L. DeMeester & K. Schwenk (2009) Contribution of cyclic parthenogenesis and colonization history to population structure in Daphnia. Molecular Ecology 18 (8): 1616-1628.
• Brede, N., A. Thielsch, C. Sandrock, P. Spaak, B. Keller, B. Streit & K. Schwenk (2006) Microsatellite markers for European Daphnia. Molecular Ecology Notes 6 (2): 536-539.