Ecological studies of direct and indirect interactions in food webs usually represent systems
as unique configurations, such as keystone predation, exploitative competition, trophic
cascades or intra-guild predation. Food web dynamics are then studied using model
systems that are unique to the particular configuration. In an endeavour to develop a more
unified theory of food web structure and function, we explore here model systems in which a
consumer species forages adaptively on two resource species along a gradient of …