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Presented By: Ecology and Evolutionary Biology

CANCELLED: EEB Thursday Seminar: Microbial community dynamics and function at micro-scales.

Otto Cordero, Massachusetts Institute of Technology

marine bacteria marine bacteria
marine bacteria
In this talk I will present our work showing how ecological interactions control the assembly and function of microbial communities at micro-scales. Using model marine particles composed of a variety of biopolymers commonly found in the ocean, I will show how microbial interactions such as cross-feeding and social cheating control community dynamics, leading to rapid successions on particles, while decreasing the metabolic rate of the system by slowing down or even blocking the particle degradation process. Particle degradation slow-down occurs because of competition for space between primary degraders and cheaters or cross-feeders, which act as parasites. The results indicate that the rates of carbon cycling in the environment can be under direct control of community ecology processes that unfold at micro-scales. Finally, I will also discuss how communities that self-assemble on particles made of different substrates converge to a set of species that display ‘universal’ dynamics, which are independent of the substrate and instead driven by the ecological wiring of the community.

Light refreshments served at 4 p.m.
marine bacteria marine bacteria
marine bacteria

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