The rate of environmental fluctuations shapes ecological dynamics in a two-species microbial system

Ecology Letters
Alejandra Rodríguez-VerdugoMartin Ackermann

Abstract

Species interactions change when the external conditions change. How these changes affect microbial community properties is an open question. We address this question using a two-species consortium in which species interactions change from exploitation to competition depending on the carbon source provided. We built a mathematical model and calibrated it using single-species growth measurements. This model predicted that low frequencies of change between carbon sources lead to species loss, while intermediate and high frequencies of change maintained both species. We experimentally confirmed these predictions by growing co-cultures in fluctuating environments. These findings complement more established concepts of a diversity peak at intermediate disturbance frequencies. They also provide a mechanistic understanding for how the dynamics at the community level emerges from single-species behaviours and interspecific interactions. Our findings suggest that changes in species interactions can profoundly impact the ecological dynamics and properties of microbial systems.

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Citations

May 27, 2020·PLoS Computational Biology·Clare I AbreuJeff Gore
Mar 24, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Florien A GorterMartin Ackermann
Oct 8, 2020·The ISME Journal·Alejandra Rodríguez-Verdugo, Martin Ackermann
Feb 23, 2021·The New Phytologist·Camille E DefrenneAdriana L Romero-Olivares
Mar 19, 2021·PLoS Computational Biology·Olga A NevIvana Gudelj
Jun 18, 2021·Nature Communications·Jen NguyenRoman Stocker
Aug 25, 2021·MSystems·Alejandra Rodríguez-Verdugo
Oct 6, 2021·Journal of the Royal Society, Interface·Shota ShibasakiSara Mitri

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