Rising relative fluctuation as a warning indicator of discontinuous transitions in symbiotic metapopulations

Neeme Lumi, Katrin Laas and Romi Mankin

Physica A: Statistical Mechanics and its Applications, 2015, vol. 437, issue C, 109-118

Abstract: The long-time limit behavior of the stochastic Lotka–Volterra model of a symbiotic metapopulation subjected to generalized Verhulst self-regulation is considered. The influence of a time-variable environment on the carrying capacities of subpopulations is modeled as a periodic deterministic part and a symmetric dichotomous noise. Relying on the mean-field approach it is established that at certain parameter regimes the mean field (average subpopulations size) exhibits hysteresis in respect to the noise correlation time, manifested in the appearance of colored-noise-induced discontinuous transitions. Especially, it is shown that the relative fluctuation of the subpopulation sizes exhibits accelerated increase prior to abrupt transitions of the metapopulation state. Moreover, in certain cases the autocorrelation function of the population sizes demonstrates anticorrelation at some values of the lag time.

Keywords: Symbiotic interaction; Verhulst self-regulation; Noise-induced catastrophic shifts; Dichotomous noise (search for similar items in EconPapers)
Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:437:y:2015:i:c:p:109-118

DOI: 10.1016/j.physa.2015.05.107

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