title: Constraints on arms races in coevolution.
abstract: The study of coevolution has matured from a descriptive science concerned with demonstrating mutual counteradaptations in interacting species into an analytical science concerned with the patterns and processes of coevolutionary change. Studies of predators and prey, parasites and hosts, and grazers and grazed have suggested that these interactions are subject to constraints that affect both the rate and the direction of coevolutionary change.
authors.affiliation: John Thompson is at the Departments of Botany and Zoology, Washington State University, Pullman, WA 99164, USA.
authors.forename: J N
authors.initials: JN
authors.lastname: Thompson