Competition with abundance-dependent fitness and the dynamics of heterogeneous populations in fluctuating environment.

Autor: Steinmetz B; Department of Physics, Bar-Ilan University, Ramat-Gan IL52900, Israel., Shnerb NM; Department of Physics, Bar-Ilan University, Ramat-Gan IL52900, Israel. Electronic address: nadav.shnerb@gmail.com.
Jazyk: angličtina
Zdroj: Journal of theoretical biology [J Theor Biol] 2021 Dec 21; Vol. 531, pp. 110880. Date of Electronic Publication: 2021 Aug 27.
DOI: 10.1016/j.jtbi.2021.110880
Abstrakt: Species competition takes place in a fluctuating environment, so the selective forces on different populations vary through time. In many realistic situations the mean fitness and the amplitude of its temporal variations are abundance-dependent. Here we present a theory of two-species competition with abundance-dependent stochastic fitness variations and solve for the chance of ultimate fixation, the time to absorption and the time to fixation. We then examine the ability of this two-species system to serve as an effective model for high-diversity assemblages and to account for the presence of an intra-specific differential response to environmental variations. The effective model is shown to capture the main features of competition between composite populations.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021. Published by Elsevier Ltd.)
Databáze: MEDLINE
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