Catastrophe-dispersion models in random and varying environments across generations
Lucas R. de Lima Fábio P. Machado
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Abstract
We study a class of branching processes in which the offspring distribution is not specified directly but is induced by a cycle of internal colony growth, catastrophic reduction and structured dispersal. The parameters governing growth, survival and dispersal are allowed to vary deterministically or randomly from one generation to the next, giving rise to branching processes in varying and random environments with implicitly defined offspring laws. We show that survival and extinction are governed entirely by the associated log-mean process, exactly as in the classical theory. The paper treats four qualitatively different dispersal mechanisms and establishes a universal ordering of the induced offspring means. For Poissonian growth with binomial survival, explicit thresholds are obtained that determine extinction or survival uniformly over all four mechanisms. A series of ecologically motivated examples with Yule-Simon growth illustrates the versatility of the framework.引用本文复制引用
Lucas R. de Lima,Fábio P. Machado.Catastrophe-dispersion models in random and varying environments across generations[EB/OL].(2026-05-05)[2026-05-07].https://arxiv.org/abs/2605.04048.学科分类
生物科学理论、生物科学方法/生物科学研究方法、生物科学研究技术
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