Dear visitor!

Thank you for finding me! My name is Marius Roesti and I am a Swiss postdoctoral researcher in the group of Prof. Dolph Schluter at the University of British Columbia (UBC) in Vancouver.

The incredible diversity we find in nature fascinates me. With my work, I am thus aiming to understand the evolutionary processes governing biological diversification. Generally, I am integrating population genomic data with ecological and phenotypic information to shed light on the processes of adaptive population diversification and speciation. My main empirical study system is the recent adaptive radiation of threespine stickleback fish, although I have also been working on a bunch of other organisms (mostly fish). Please find my published work here.

Current projects involve studying wild stickleback populations inhabiting ecologically distinct environments, such as lakes differing in their abiotic properties or in a single biotic factor – that is, the presence/absence of a single fish competitor (sculpin). I am describing phenotypic adaptive divergence in both stickleback and sculpin as a consequence of their co-existence. High-resolution genome scans between the divergent stickleback populations illuminate the way the genome diverges during adaptive diversification. My current study populations have evolved in allopatry, which stands in contrast to the focus of most of my previous (genomics) work, where I mainly studied parallel population divergence in the face of gene flow (parapatry).

Besides the above comparative projects on wild-caught fish, I am also conducting experiments in (semi-)natural environments to test specific evolutionary predictions. One of the questions I am currently targeting with a large-scale experiment conducted at UBC's Experimental Fish Pond Facility is whether a simple biotic change to the natural environment of an organism can result in reproductive isolation as a by-product.

Finally, the genomics insights from my empirical research stimulate and inform my theoretical work. I am using individual-based forward simulations to better understand the genomic footprints of selection. I have a particular interest in gaining a mechanistic and evolutionary understanding for why there is intra-genomic variation in the rate of recombination (crossover) and how such variation influences adaptive genome divergence. With my simulations I further explore how recombination rate variation in context of multigenic adaptation influences evolutionary genomics methodologies and inferences, such as the search for genomic targets of selection.

Please don't hesitate to contact me if you like to get further information on my past or ongoing work.


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