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COMPLEX TIME: Adaptation, Aging, & Arrow of Time

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Irreversible Processes in Ecological Evolution/Cooperative growth and cell-cell aggregation in marine bacteria

From Complex Time

January 29, 2019
2:30 pm - 3:30 pm

Presenter

Otto Cordero (MIT)

Abstract

Bacterial cooperation, whereby cells secrete compounds that can facilitate the growth of neighboring cells, has been extensively studied through the lens of evolutionary biology. However, the environmental implications of cooperation and the ecological scenarios under which it takes place remain much less understood. In this talk I will discuss the conditions under which cooperative growth emerges in microbial populations that degrade complex organic materials in the ocean. I will show that organisms that are poor secretors of hydrolytic enzymes use chemotactic behavior to form cell-cell aggregates that enable individuals to increase local concentrations and efficiently uptake the solubilized organic matter. By contrast, when organisms secrete highly active enzymes dynamics turn competitive, cells avoid aggregation and the efficiency of carbon uptake drops. I will also discuss the theoretical limits of aggregation and how bacterial isolates from the ocean overcome these limits in the laboratory by developing multicellular behaviors. I will back up these results with theory, data from individual based models and experiments with natural isolates. Finally, I will discuss the potential role of social cheaters in the natural environment, based on a study with hundreds of micro-scale particle colonization experiments in natural seawater.

Presentation file(s)
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Post-meeting Reflection

Reference Material

During Annette Ostling's talk, I mentioned this study, which finds "clusters" in trait space emerging without explicit assumptions about niches. I think Jacopo may find it interesting as well.

https://www.pnas.org/content/114/13/E2719

Title Author name Source name Year Citation count From Scopus. Refreshed every 5 days. Page views Related file
Microbial interactions lead to rapid micro-scale successions on model marine particles Manoshi S. Datta, Elzbieta Sliwerska, Jeff Gore, Martin F. Polz, Otto X. Cordero Nature Communications 2016 74 1
Multitrait successional forest dynamics enable diverse competitive coexistence Proceedings of the National Academy of Sciences 2017 0 1