Selection of strains
We selected a total of 23 strains (detailed strain information in Table S1). Each of the eight Saccharomyces species is represented by three strains isolated from different geographic locations and habitats, with the exception of the newly discovered S. jurei , for which only two strains were available to us. We only used non-domesticated, wild-type strains that do not show flocculation or cell clumping (Table S1).