How do human activities shape the combinations of plants, animals, and other organisms in the world around us? Managed ecosystems like agriculture and habitat restoration projects provide an opportunity for ecologists to answer this question and study its consequences. These include the consequences for people, who rely on ecosystem services that these communities provide. Focusing on two very different ecosystems—vegetable crops and restored tallgrass prairie—Dr. Barber will review his research on species interactions like herbivory, pollination, predation, and competition. These communities and interactions are affected by the decisions people make as stewards and managers of land, so understanding their effects may make it possible support both biodiversity and human benefits.