Prof. Dr. Holger Schielzeth

I am an evolutionary biologist and passionate naturalist with a particular interest in microevolution. Microevolution is focused on evolutionary change that takes place within populations and that ultimately lead to divergence between populations. I make use of quantitative genetic techniques for studying the genetic architecture of sexually selected traits and of molecular markers for localizing additive genetic variation in the genome ('QTL mapping'). Two particularly intriguing topics are the evolution of sexual ornamentation and of behavioral strategies for successful reproduction. Another special focus lies on the sources of variation in mating preferences, an important component of sexual selection. Other interests include life history evolution, inbreeding depression, condition-dependent trait expression, biostatistics and animal migration.

We are working with the club-legged grasshopper (Gomphocerus sibiricus) as a novel model system for studying the evolution of sexually selected traits. The species is remarkable for its sexually dimorphic ornament: males possess swollen front legs ('Popeye arms') that are presented to the females during display. The system is amenable to laboratory and field work, which offers great opportunities for testing results from the lab in the natural environment. Another key advantage is that the species allows studies within populations as well as between populations/subspecies. The main aim of my work is to understand the coevolution and conflict between the sexes using quantitative genetic and genomic tools. By doing so, I am addressing fundamental evolutionary questions such as the evolution of sexual signals and the evolutionary dynamics of indirect genetic effects.

Huang, Y., Stein, G., Kolle, O., Kübler, K., Schulze, E.-D., Dong, H., Eichenberg, D., Gleixner, G., Hildebrandt, A., Lange, M., Roscher, C., Schielzeth, H., Schmid, B., Weigelt , A., Weisser, W.W., Shadaydeh, M., Denzler, J., Ebeling, A. & Eisenhauer, N. (2023). Enhanced stability of grassland soil temperature by plant diversity. Nature Geoscience doi: 10.1038/s41561-023-01338-5External link

Varma, M., Winter, G., Rowland, H.M. & Schielzeth, H. (2023). Ontogeny of color development in two green-brown polymorphic grasshopper species. Ecology and Evolution doi: 10.1002/ece3.10712External link 

Argens, L., Weisser, W.W., Ebeling, A., Eisenhauer, N., Lange, M., Oelmann, Y., Roscher, C., Schielzeth, H., Schmid, B., Wilcke, W. & Meyer, S.T. (2023). Relationships between ecosystem functions vary among years and plots and are driven by plant species richness. Oikos doi: 10.1111/oik.10096External link 

Mutwill, A.M., Schielzeth, H., Richter, S.H., Kaiser, S. & Sachser, N. (2023). Conditional on the social environment? Roots of repeatability in hormone concentrations. Hormones and Behavior doi: 10.1016/j.yhbeh.2023.105423External link

Pick, J.L., Kasper, C., Allegue, H., Dingemanse, N., Dochtermann, N.A., Laskowski, K.L., Lima, M.R., Schielzeth, H., Westneat, D.F., Wright, J. & Araya-Ajoy, Y.G. (2023). Describing posterior distributions of variance components: Problems and the use of null distributions to aid interpretation. Methods in Ecology and Evolution (in press) doi: 10.1111/2041-210X.14200External link 

Singh, P., Wolthaus, J., Schielzeth, H. & Müller, C. (2023). State-dependency of behavioural traits is a function of the life-stage in a holometabolous insect. Animal Behaviour 203: 29-39. doi: 10.1016/j.anbehav.2023.06.013External link 

Winter, G., Wirsching, L. & Schielzeth, H. (2023). Condition-dependence of (un)predictability in escape behavior of a grasshopper species. Behavioral Ecology doi: 10.1093/beheco/arad047External link [Data availability]External link  [Code availability]External link