Article ID Journal Published Year Pages File Type
4496552 Journal of Theoretical Biology 2012 10 Pages PDF
Abstract

Predicting and controlling the behaviour of microbial ecosystems demands a fundamental understanding of the factors controlling their dynamics. In the natural environment microbes typically live in small local populations with limited and unpredictable nutrient supply and high death rates. Here, we show that these conditions can produce oscillations in microbial population dynamics, even for a single population. For a large population, with deterministic growth dynamics, our model predicts transient (damped) oscillations. For a small population, demographic noise causes these oscillations to be sustained indefinitely. We show that the same mechanism can produce sustained stochastic oscillations in a two-species, nutrient-cycling microbial ecosystem. Our results suggest that oscillatory population dynamics may be a common feature of small microbial populations in the natural environment, even in the absence of complex interspecies interactions or spatial structuring.

► We study microbial ecosystem dynamics under natural environmental conditions. ► For large populations, we find microbes experience damped oscillations. ► Oscillations arise when death rates are large and nutrient inflow rate small. ► Small number fluctuations cause these oscillations to be sustained indefinitely. ► Sustained stochastic oscillations also arise in a mutualistic microbial ecosystem.

Related Topics
Life Sciences Agricultural and Biological Sciences Agricultural and Biological Sciences (General)
Authors
, , ,