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Effects of perceptual and movement ranges on joint predator–prey distributions


M. E. Fraker, Dept of Zoology, Oklahoma State Univ., 501 Life Science West, Stillwater, OK 74078, USA. E-mail:


We developed a spatially-explicit individual-based model to study how limited perceptual and movement ranges affect spatial predator–prey interactions. Earlier models of ‘predator–prey space games’ were often developed by modifying ideal free distribution models, which are spatially-implicit and also assume that individuals are omniscient, although some more recent models have relaxed these assumptions. We found that under some conditions, the spatially-explicit model generated similar predictions to previous models. However, the model showed that limited range in a spatially-explicit context generated different predictions when 1) predator density and range are both small, and 2) when the predator movement range varied while the prey range was small. The model suggests that the differences were the result of 1) movement range changing the value of information sources and thus changing the behavior of individual predators and prey and 2) movement range limiting the ability of individuals to exploit the environment.