Species in ecosystems often form complex networks of different kinds of interactions, such as between predators and prey, between consumers and abiotic resources, between mutualists, between hosts and pathogens, and between organisms through modification of physical environmental conditions. Most research in current community ecology focuses on one of these interaction types, and select one suitable type of ecosystem to study it. Instead, it is our ambition to study multiple interaction types simultaneously, in order to link species traits to community structure and dynamics on both ecological and evolutionary time scales. We study these multiple interactions in a variety of ecosystems to achieve generalizations and oversight.