My name is Keiichi Morita, and I joined iTHEMS in April 2022 as a junior research associate / student trainee. I am now involved in a Ph.D. program at the SOKENDAI University. The main question of my research is how adaptive evolution can determine species coexistence and structures of ecological communities. I focus on rapid adaptation which can change the strength and directions of species interactions and finally affect population dynamics. I hope to understand how the evolution of an individual phenotype can affect species coexistence by formulating transient processes and finding conditions of coexistence from analysing and simulating my mathematical models. I consider analyzing experimental data and demonstrating my mathematical models. My final goal is to discover a general rule in ecology. I am looking forward to interacting with other members working with various interests in iTHEMS and finding a new direction of research out of it.