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SUMMARY:Life at High Reynolds Number - Nelson\, D (Harvard University)
DTSTART:20141121T140000Z
DTEND:20141121T150000Z
UID:TALK56247@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Microorganisms living in the ocean can be subject to strong tu
 rbulence\, with cell division times in the middle of a cascade of eddy tur
 nover times.   We explore the dynamics of a Fisher equation describing cel
 l proliferation in one and two dimensions\, with cellular  \ndiffusion as 
 well as a coupling to turbulent advection.   Due to inertial effects and c
 ell buoyancy\, we argue that the effective advecting velocity field is com
 pressible.   For strong enough compressible turbulence\, microorganisms su
 ch as bacteria and phytoplankton track\, in a quasilocalized fashion\, sin
 ks in the turbulent velocity field\, with important consequences for the c
 arrying capacity and for fixation times when two genetically different spe
 cies compete\n\n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
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