Thank you for finding me! I am fascinated by Evolution and currently working as a Postdoc at the University of Bern in Switzerland.
Why are living organisms so incredibly diverse? – My science is driven by the desire to find answers to this fundamental question. Defined broadly, my approach is to integrate population genomics within an ecological and phenotypic framework to shed light on the processes influencing adaptive organismal (population) diversification. However, my research is not contingent upon a specific type of approach, but rather follows my instinct for interesting questions. My main empirical study system is the recent adaptive radiation of threespine stickleback fish, although I have also been working with other organisms (cichlids, Daphnia, icefish, and lampreys). You can find my published work here.
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). I plan to again focus on the latter in the near future.
More recently, I’ve really started to enjoy conducting large field experiments that 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 the genome during adaptive 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, do not hesitate to contact me!
SNIPPETS OF MY RESEARCH