Climate-driven adaptive microevolution in wild yeasts.

Climatic gradients drive significant genomic and phenotypic diversification in wild Saccharomyces eubayanus populations across Patagonia, with southern populations showing the highest diversity.

• Why it matters: Understanding how environmental variation influences microbial evolution is limited by sparse sampling of wild microbes, hindering insights into ecological and genetic adaptation processes.
• What they did: Researchers sampled 117 isolates across ~1,000 km in Chilean Patagonia, analyzing environmental factors, whole-genome sequences, and phenotypic traits to link climate with microbial diversity.
• The result: Climatic factors like latitude, temperature, and precipitation explained over half of the genetic variation, revealing climate-driven adaptations such as cold tolerance and reproductive strategies that promote diversification.