Peter Yodzis

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It has long been recognized that gradual secular changes in environmental parameters may lead to discontinuous changes in ecosystems. The dominant model explaining such changes has been the presence of alternative attractors and their basins. We discuss a related model, that of basin boundary collisions, that may also produce discontinuous changes in an(More)
Previous research suggests that local interactions and limited animal mobility can affect population dynamics. However, the spatial structure of the environment can further limit the mobility of animals. For example, an animal confined to a river valley or to a particular plant cannot move with equal ease in all directions. We show that spatial architecture(More)
We claim that diffusion-limited rates of reaction can be an explanation for the altered population dynamics predicted by models incorporating local interactions and limited individual mobility. We show that the predictions of a spatially explicit, individual-based model result from reduced rates of predation and reproduction caused by limited individual(More)
A stage-structured consumer-resource model is investigated using plausible biological parameter estimates. The model, developed from patterns in energy allocation across fish life-history strategies, explicitly considers the effects of delays in maturation on juvenile growth and mortality. It is found that stage structure in the consumer fish population(More)
References 1 Boyd, I.L. (2001) Culling predators to protect fisheries: a case of accumulating uncertainties. Trends Ecol. Evol. 16, 281–282 2 Anon. (1996) The Bering Sea Ecosystem, National Research Council, National Academy Press 3 Steele, J.H. and Henderson, E.W. (1984) Modeling long-term fluctuations in fish stocks. Science 224, 985–987 4 Halley, J.M.(More)
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