I’m a PhD-student working in the Theoretical Ecology group of the Institute for Biodiversity and Ecosystem Dynamics (IBED) at the University of Amsterdam. In my research I use physiological structured population models (PSPMs) to study the interplay between ontogenetic development, environmental or ecological feedbacks and evolution. Together with reproduction and mortality, ontogenetic development (e.g. growth or maturation) is a basic property of all living things and essential for population persistence (i.e. individuals must growth and mature before they can reproduce). The consequence of ontogenetic development is that individuals change their ecological role during life and my research focuses on the population and evolutionary consequences of these ontogenetic changes. Furthermore, I ask the more basic question whether selection drives differently sized individuals to be ecologically more equal or more different and how this depends on the life history characteristics of the species involved.