Eco-evolutionary dynamics of cooperative antimicrobial resistance in a population of fluctuating volume and size
arXiv:2312.14826 · doi:10.1088/1751-8121/ad4ad6
Abstract
Antimicrobial resistance to drugs (AMR), a global threat to human and animal health, is often regarded as resulting from cooperative behaviour. Moreover, microbes generally evolve in volatile environments that, together with demographic fluctuations (birth and death events), drastically alter population size and strain survival. Motivated by the need to better understand the evolution of AMR, we study a population of time-varying size consisting of two competing strains, one drug-resistant and one drug-sensitive, subject to demographic and environmental variability. This is modelled by a binary carrying capacity randomly switching between mild and harsh environmental conditions, and driving the fluctuating volume (total amount of nutrients and antimicrobials at fixed concentration), and thus the size of the community (number of resistant and sensitive cells). We assume that AMR is a shared public good when the concentration of resistant cells exceeds a fixed concentration cooperation threshold, above which the sensitive strain has a growth advantage, whereas resistant cells dominate below it. Using computational means, and devising an analytical treatment (built on suitable quenched and annealed averaging procedures), we fully characterise the influence of fluctuations on the eco-evolutionary dynamics of AMR, and notably obtain specific strain fixation and long-lasting coexistence probabilities as a function of the environmental variation rate and cooperation threshold. We find that microbial strains tend to coexistence, but demographic fluctuations eventually lead to the extinction of resistant or sensitive cells for small or large values of the concentration cooperation threshold, respectively. This also holds for dynamic environments, whose specific properties determine the extinction timescale.
34+5 pages, 5 figures. Simulation data and codes for all figures are electronically available from the University of Leeds Data Repository. DOI: https://doi.org/10.5518/1462. In this version: minor typos corrected
References in corpus (14)
- Mobility promotes and jeopardizes biodiversity in rock-paper-scissors games
- Cyclic dominance in evolutionary games: A review
- Fixation of strategies for an evolutionary game in finite populations
- Stochastic Models of Evolution in Genetics, Ecology and Linguistics
- Stochastic population dynamics in spatially extended predator-prey systems
- Evolution of a Fluctuating Population in a Randomly Switching Environment
- The edge of neutral evolution in social dilemmas
- Fixation of a Deleterious Allele under Mutation Pressure and Finite Selection Intensity
- Resonant Activation of Population Extinctions
- Polarization and Consensus in a Voter Model under Time-Fluctuating Influences
- Coupled environmental and demographic fluctuations shape the evolution of cooperative antimicrobial resistance
- Evolutionary Dynamics in a Varying Environment: Continuous versus Discrete Noise
- Coexistence of Competing Microbial Strains under Twofold Environmental Variability and Demographic Fluctuations
- Emergence of a Novel Phase in Population and Community Dynamics Due to Fat-Tailed Environmental Correlations