The International Max Planck Research School (IMPRS) "Chemical Communication in Ecological Systems" in Jena, Germany, invites applications for 6 PhD positions beginning in September 2022 – January 2023. The overarching research topic is the use of molecular, chemical and neurobiological techniques to experimentally explore ecological interactions under natural conditions. The main focus is on the relationship between plants, microbes and herbivores, and their environment, as well as the evolutionary and behavioral consequences of these interactions.