A coevolutionary predator-prey model with quantitative characters

Article Abstract:

A new model for coevolution in generalized predator prey systems incorporates a quantitative character relevant in both prey and predator in the number of equilibria, and is determined by prey birth and predator death rates and stabilizing selection coefficients. Only one equilibrium can be stable, and stability is achieved when additive genetic variance is high enough in both the prey and predator populations. A comparison is made between the new coevolutionary model and earlier coevolutionary model.

Predator control

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The time-scale problem in exploiter-victim models: does the solution lie in ratio-dependent exploitation?

Article Abstract:

Arditi and Ginzburg's model of ratio-dependent exploitation to explain the effects of time-scale in exploiter-victim models was not corroborated in a study of time-delayed numerical responses on predator isoclines. Research on foraging rates and population dynamics among coyotes and jackrabbits was analyzed for the study. Statistics on biomass patterns in plants and herbivores were also assessed in defense of the victim-dependent model.

Growth, Animals

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The logic and realism of the hypothesis of exploitation ecosystems

Article Abstract:

An assessment is presented on the top-down hypothesis as a model of terrestrial ecosystem trophic dynamics, in which plant biomass build-up is assumed to need top-down folivore control. While evidence exists to support the hypothesis, questions remaining include the role of folivorous insects, the impact of temperate and boreal browsers, and the sufficiency and relevance of energy constraints in trophic dynamic variances.

Sweden, Statistical Data Included, Models, Plant communities, Vegetation dynamics, Folivores

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