The impact of microscale fluid motion on the ecology of marine phytoplankton and soil bacteria
- Event time: 1:00pm
- Event date: 17th March 2014
- Speaker: William Durham (University of Oxford)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
While many microorganisms spend their lives in moving fluids, fluid dynamics are often ignored when characterizing important ecological processes such as competition, predation, and the maintenance of diversity. In this talk, I will present laboratory experiments and mathematical models that illustrate how flow shapes the ecology of microbes by driving heterogeneity in their spatial distribution. First, I will show how turbulent flow ‘unmixes’ the distribution of motile phytoplankton. The resultant centimeter scale patches of phytoplankton are routinely observed in the ocean and have a profound impact on predation rates. Second, I will present experiments in which E. coli is inoculated in patterned microfluidic devices that simulate a porous soil environment. We find biofilm patches undergo a self-organization mediated by the interaction of growth and flow, leading to the formation of preferential flow channels. A model, which combines physics and game theory, predicts how this interaction facilitates competition between bacterial genotypes with different intrinsic growth rates.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..