BACKGROUND Our understanding of coevolution in a predator-prey system is based mostly on pair-wise interactions. METHODOLOGY AND PRINCIPAL FINDINGS Here I analyze a one-predator-two-prey system in which the predator's attack ability and the defense abilities of the prey all evolve. The coevolutionary consequences can differ dramatically depending on the initial trait value and the timing of t...

Traditionally, predator switching has been assumed to be a stabilizing force in ecological systems. Recent work, however, has shown that predator switching can be either stabilizing or destabilizing. Most models of predator switching, to date, assume that prey are behaviorally passive and do not respond to predators. We allowed prey to respond behaviorally to predators, so as to avoid capture, ...

The problem of tracking and capturing a moving obstacle in two dimensions by a mobile robot equipped with a wide-beam sonar system is discussed. In a practical system the range and azimuth measurements contain random errors and are available over a limited region. This pursuer/prey problem is treated as a feedback control system for which the pursuer action is dependent of the observed measurem...

The population dynamics of predator-prey systems in the presence of patch-specific predators are explored in a setting where the prey population has access to both habitats. The emphasis is in situations where patch-prey abundance drives prey-dispersal between patches, with the fragile prey populations, that is, populations subject to the Alee effect. The resulting four-dimensional model’s math...