The proposed research explores the influence of rapid trait evolution on contemporary community and ecosystem dynamics, and the role of such changes on natural selection. These ecological dynamics of natural selection are a focal point for the field of eco-evolutionary dynamics, which grew from the recognition that rapid evolution can culminate in feedbacks between ecological and evolutionary processes. However, we know little about which heritable traits are involved in these feedbacks, and the mechanisms by which trait-mediated effects of organisms on different ecosystem components (e.g. community composition, nutrient cycling) can shape selection pressures. In this work, we study the evolution of stickleback foraging in natural ponds and lakes on the Southern Peninsula of Greenland. In particular, we are interested in how the community context, namely the prey (i.e. zooplankton) and predators (i.e. Char), affect stickleback trait evolution.