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A n a l y s e s e t m o d é l i s a t i o n d e t r a j e c t o i r e s d e c o p é p o d e s : m a r c h e s a l é a t o i r e s c o r r é l é e s e t d y n a m i q u e d e s é t a t s d e n a g e Fr an ço is G . Sc hm itt Di re ct eu r de Re ch er ch e au CN RS Di re ct eu r du LO G W im er eu x , Fr an ce

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François G. Schmitt
Directeur de Recherche au CNRS
Directeur du LOG
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OutlineComplexity of aquatic ecosystems

Many constituents



Microbs, viruses


Many interactions

Nutrients come from the bottom

Phytoplankton needs light and nutrients

Zooplankton eat phytoplankton

Larval fishes eat zooplankton

Dead organisms go to the bottom and become nutrients

Etc.eAsboopuptd co
Belong to zooplankton (most of them)
Small crustaceans (typically 1 mm)
Many species in coastal waterImportance of turbulence for plankton and

Turbulence linked to light through turbidity

Turbulence brings nutrients from the bottom to the surface
where phytoplankton live

Turbulence is an efficient way to travel at low cost for

Turbulence enhances contact rates: food and mating
Copepods mating–
Copepods have bad vision (often turbid
waters, or deep waters with no light)

Have complex sensors to detect changes
in the surrounding fluid, and hence to
detect the approach of other swimming

Hence limited and finite contact distances
Copepods sensorsExample

Smooth mean field, but intermittent instantaneous field: non easy signal
processing task to find the sourceExample

Smooth mean field, but intermittent instantaneous field: non easy signal
processing task to find the source