The wine yeast, S accharomyces cerevisiae, is the best understood microbial eukaryote at
the molecular and cellular level, yet its natural geographic distribution is unknown. Here we
report the results of a field survey for S. cerevisiae, S. paradoxus and other budding yeast on
oak trees in Europe. We show that yeast species differ in their geographic distributions, and
investigated which ecological variables can predict the isolation rate of S. paradoxus, the
most abundant species. We find a positive association between trunk girth and S. paradoxus …