Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G05: Physics of Bacterial Communities: Interaction and Dynamics
11:30 AM–2:30 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-178A
Sponsoring
Units:
DBIO DFD DSOFT
Chair: Albert Siryaporn, University of California, Irvine
Abstract: G05.00004 : Irvin Oppenheim Award (2022): Microbial diversity and competition for resources in a model seasonal ecosystem
12:06 PM–12:42 PM
Presenter:
Amir Erez
(Hebrew University of Jerusalem)
Author:
Amir Erez
(Hebrew University of Jerusalem)
How is microbial diversity maintained, in light of the aforementioned resource competition? Here, we focus on consumer-resource models subject to serial dilutions. Using a theoretical framework we developed, we probe the effects of resource competition, cross-feeding, mutation, and adaptation on diversity in microbial ecosystems. We find that diversity is influenced by these mechanisms in very different ways, suggesting that real ecosystems may not obey a universal nutrient-diversity relationship. Our results can be explained by an early-bird effect whereby species that grow quickly because their preferred nutrients are supplied, then leverage that early advantage - even after those preferred nutrients are depleted and the remaining nutrients are more efficiently metabolized by competitors.
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