Thank you for finding me! I’m a Swiss postdoc interested in Evolution and currently working at the University of Bern in Switzerland.
Why are living organisms so incredibly diverse? – My research is driven by my desire to find answers to this fundamental question in biology. My approach is to integrate population genomics within a clear ecological and phenotypic framework to shed light on the factors and processes influencing organismal diversification. My main empirical study system is the recent adaptive radiation of threespine stickleback fish, although I have also worked on other organismal systems (cichlids, Daphnia, icefish, and lampreys). Here, you can find my published work.
Current projects involve the study of stickleback populations inhabiting distinct environments, such as lakes differing mainly in abiotic factors (e.g., Haenel et al. 2019), or lakes differing in a single biotic factor – that is, the presence vs. absence of a competing fish species. I am describing how the genome (e.g., Miller, Roesti, Schluter 2019), as well as traits (forthcoming), diverge due to this species interaction . It happens to be that most of my current empirical work uses allopatric populations, which stands in contrast to the majority of my previous work, where the emphasis was on population divergence in the presence of gene flow (e.g., Roesti et al. 2012, Roesti et al. 2014, Roesti et al. 2015). In the near future, however, I plan to again focus on the latter.
I also like conducting field experiments, because they allow me to test specific predictions prompted by observations in wild populations. One of the questions I am currently answering experimentally is whether a simple biotic change to the environment of an organism has resulted in substantial reproductive isolation (speciation) as a by-product.
Results from my empirical research stimulate and inform my theoretical work. I’m using simulations to better understand the genomic footprints of selection (e.g., Roesti et al. 2014). I have longstanding interest in gaining an evolutionary understanding of intra-genomic variation in the rate of crossover (recombination), and how this variation influences genomic divergence during diversification (e.g., Roesti et al. 2012, Roesti et al. 2013, Haenel et al. 2018, Roesti 2018). Simulations further help me explore how crossover rate variation in context of polygenic adaptation influences evolutionary genomic methodologies and inferences, such as the search for targets of selection through genome scans (Roesti et al. 2012, Berner & Roesti 2017, Roesti 2018).
If you like to get further information on my past or ongoing work, please do not hesitate to contact me.
SNIPPETS OF MY RESEARCH