This research paper explores the diversity and distribution of fermentative yeasts found on oak trees in southern Sweden, which represents the northern limit of their oak hosts' range. Using DNA metabarcoding of bark samples, the study identified three main yeast genera, Saccharomyces, Kluyveromyces, and Pichia, with their abundance and distribution influenced by latitude and longitude, as well as temperature and precipitation. Additionally, the researchers discovered that older oak trees tend to host more diverse and balanced yeast communities. Laboratory experiments also indicated that temperature affects yeast growth, with different strains showing varying tolerances to cold and warm conditions depending on their origin, suggesting adaptation to local climates.
