Roman Stocker,
Associate Professor, Massachusetts Institute of Technology
Abstract: It is now widely recognized that microbial activities represent one of the main forces shaping biogeochemistry and productivity in the ocean. At the level of individual microbes, the ocean is a sea of gradients. Chemical gradients define heterogeneous resource landscapes, while flow gradients exert forces and torques on organisms. Our understanding of these interactions - both chemical and fluid mechanical - has been hampered by the difficulty of studying microbial behavior at appropriate spatiotemporal scales. Modern microfluidic and millifluidic tools afford unprecedented access to this microscale world. I will show how these approaches can help shed light on microbial behavior in both resource gradients (chemotaxis) and flow gradients (gyrotaxis).
