OUTLINE

MOTIVATION: Chemistry and biology in fluid flows. Spatial structure, why it is worth to understand it?

The LINEARLY DECAYING PASSIVE SCALAR

• Spectra
• Chaotic advection: The smooth-filamental transition
• Open vs. closed flows. Multifractality
• Plankton in a meandering jet

PLANKTON PATCHES AND BLOOMS

• Blooms
• Plankton modeling
• Excitability
• Excitability under chaotic advection

SURPRISES IN INDIVIDUAL MODELLING