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Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs

Ecological and evolutionary dynamics are intrinsically entwined. On short timescales, ecological interactions determine the fate and impact of new mutants, while on longer timescales evolution shapes the entire community. Here, we study the evolution of large numbers of closely related strains with...

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Detalles Bibliográficos
Autores principales: Mahadevan, Aditya, Pearce, Michael T, Fisher, Daniel S
Formato: Online Artículo Texto
Lenguaje:English
Publicado: eLife Sciences Publications, Ltd 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10306370/
https://www.ncbi.nlm.nih.gov/pubmed/37114771
http://dx.doi.org/10.7554/eLife.82734
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author Mahadevan, Aditya
Pearce, Michael T
Fisher, Daniel S
author_facet Mahadevan, Aditya
Pearce, Michael T
Fisher, Daniel S
author_sort Mahadevan, Aditya
collection PubMed
description Ecological and evolutionary dynamics are intrinsically entwined. On short timescales, ecological interactions determine the fate and impact of new mutants, while on longer timescales evolution shapes the entire community. Here, we study the evolution of large numbers of closely related strains with generalized Lotka Volterra interactions but no niche structure. Host-pathogen-like interactions drive the community into a spatiotemporally chaotic state characterized by continual, spatially-local, blooms and busts. Upon the slow serial introduction of new strains, the community diversifies indefinitely, accommodating an arbitrarily large number of strains in spite of the absence of stabilizing niche interactions. The diversifying phase persists — albeit with gradually slowing diversification — in the presence of general, nonspecific, fitness differences between strains, which break the assumption of tradeoffs inherent in much previous work. Building on a dynamical-mean field-theory analysis of the ecological dynamics, an approximate effective model captures the evolution of the diversity and distributions of key properties. This work establishes a potential scenario for understanding how the interplay between evolution and ecology — in particular coevolution of a bacterial and a generalist phage species — could give rise to the extensive fine-scale diversity that is ubiquitous in the microbial world.
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spelling pubmed-103063702023-06-29 Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs Mahadevan, Aditya Pearce, Michael T Fisher, Daniel S eLife Ecology Ecological and evolutionary dynamics are intrinsically entwined. On short timescales, ecological interactions determine the fate and impact of new mutants, while on longer timescales evolution shapes the entire community. Here, we study the evolution of large numbers of closely related strains with generalized Lotka Volterra interactions but no niche structure. Host-pathogen-like interactions drive the community into a spatiotemporally chaotic state characterized by continual, spatially-local, blooms and busts. Upon the slow serial introduction of new strains, the community diversifies indefinitely, accommodating an arbitrarily large number of strains in spite of the absence of stabilizing niche interactions. The diversifying phase persists — albeit with gradually slowing diversification — in the presence of general, nonspecific, fitness differences between strains, which break the assumption of tradeoffs inherent in much previous work. Building on a dynamical-mean field-theory analysis of the ecological dynamics, an approximate effective model captures the evolution of the diversity and distributions of key properties. This work establishes a potential scenario for understanding how the interplay between evolution and ecology — in particular coevolution of a bacterial and a generalist phage species — could give rise to the extensive fine-scale diversity that is ubiquitous in the microbial world. eLife Sciences Publications, Ltd 2023-04-28 /pmc/articles/PMC10306370/ /pubmed/37114771 http://dx.doi.org/10.7554/eLife.82734 Text en © 2023, Mahadevan, Pearce et al https://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use and redistribution provided that the original author and source are credited.
spellingShingle Ecology
Mahadevan, Aditya
Pearce, Michael T
Fisher, Daniel S
Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs
title Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs
title_full Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs
title_fullStr Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs
title_full_unstemmed Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs
title_short Spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs
title_sort spatiotemporal ecological chaos enables gradual evolutionary diversification without niches or tradeoffs
topic Ecology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10306370/
https://www.ncbi.nlm.nih.gov/pubmed/37114771
http://dx.doi.org/10.7554/eLife.82734
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