Stabilization of extensive fine-scale diversity by ecologically driven spatiotemporal chaos

Proceedings of the National Academy of Sciences of the United States of America
Michael T PearceDaniel S. Fisher

Abstract

It has recently become apparent that the diversity of microbial life extends far below the species level to the finest scales of genetic differences. Remarkably, extensive fine-scale diversity can coexist spatially. How is this diversity stable on long timescales, despite selective or ecological differences and other evolutionary processes? Most work has focused on stable coexistence or assumed ecological neutrality. We present an alternative: extensive diversity maintained by ecologically driven spatiotemporal chaos, with no assumptions about niches or other specialist differences between strains. We study generalized Lotka-Volterra models with antisymmetric correlations in the interactions inspired by multiple pathogen strains infecting multiple host strains. Generally, these exhibit chaos with increasingly wild population fluctuations driving extinctions. But the simplest spatial structure, many identical islands with migration between them, stabilizes a diverse chaotic state. Some strains (subspecies) go globally extinct, but many persist for times exponentially long in the number of islands. All persistent strains have episodic local blooms to high abundance, crucial for their persistence as, for many, their average popula...Continue Reading

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Citations

Jul 1, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jonas DenkOskar Hallatschek
Aug 17, 2020·Physical Review Letters·Wenping CuiPankaj Mehta
May 15, 2021·Nature Ecology & Evolution·Silvia De Monte
Aug 25, 2021·Current Opinion in Microbiology·Arne Traulsen, Michael Sieber
Oct 28, 2021·PLoS Computational Biology·Susanne Pettersson, Martin Nilsson Jacobi

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