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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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lA n?aglsyysteeso reeti meocd ?alrics?ast iaoun td en rthrsaaj?etciteo iorrelse dted ncmoqpe?dpso?daessd: ameae
François G. Schmitt
Directeur de Recherche au CNRS
Directeur du LOG
Wimereux, FranceaVlioeoinlalUel rsetiaatii osni a(?1g8e7ce4e)e nm1aRirsL )nro uevoeoa uc? llea bGoer aetxoiiSrieL eCUN)RNSi teunt a2 0u0 8e:s?t L3b5r tciheedrOcahoeouir st d? ?Escinnvs,iWrmornu M3r0n dtotcot(oirla n tnsv.?M E1(0n0ve sip?edr siotnrnlessS?tiagteito nd emaaer ilnceo:o?m /R/elc:h eersc?hte ?e oEinmsee i gtn?etm?ennnte? lAacrcauoeoisli s(osuteatg,eosp,o ?cshcecrlcahletubrvso)x?i tEonosieiipginaermse?ndt Laabbco?ria tuopiirsen dp?cOac?iaanionlsorgli e? iert ?dmer hGl?goes ciee nicers?,h lWei muecrieau?xoRsercahienrecphremsn aiinntmedrldsitsocics mMcuelttbinffrsa cutSyalld mr atnrdionmt owra lmkosi iyna icsoop ehpio dw mbieghsaavei
OutlineComplexity of aquatic ecosystems

Many constituents

Phytoplankton

Zooplankton

Microbs, viruses

Etc.

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
copepods

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
plankton

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
organisms

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

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