Revilla T A
Instituto de Zoología Tropical, Universidad Central de Venezuela, Caracas.
J Theor Biol. 2000 May 21;204(2):289-98. doi: 10.1006/jtbi.2000.2017.
Two models are made to account for the dynamics of a consumer-resource system in which the consumers are divided into juveniles and adults. The resource grows logistically and a type II functional response is assumed for consumers. Resource levels determine fecundity and maturation rates in one model, and mortality rates in the other. The analysis of the models shows that the condition for establishment of consumers is that the product of per capita fecundity rate and maturation rates is higher than the product of juvenile and adult per capita decay rates at a resource level equal to its carrying capacity. This result imposes a minimal abundance of resource able to maintain the consumers. A second result shows an equilibrium stage structure, with a small instability when juveniles and adults mean saturation constants are different. The implications of these results for community dynamics are discussed.
构建了两个模型来解释消费者 - 资源系统的动态变化，其中消费者分为幼体和成体。资源呈逻辑斯蒂增长，并且假设消费者具有II型功能反应。在一个模型中，资源水平决定繁殖力和成熟率，在另一个模型中决定死亡率。对这些模型的分析表明，消费者得以建立的条件是在资源水平等于其承载能力时，人均繁殖率与成熟率的乘积高于幼体和成体人均衰减率的乘积。这一结果给出了能够维持消费者生存的资源的最小丰度。第二个结果显示了一个平衡的阶段结构，当幼体和成体的平均饱和常数不同时存在小的不稳定性。讨论了这些结果对群落动态的影响。
