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Description

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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Informations

• Publié par: pefav
• Nombre de lectures: 7
• Langue: English
• Poids de l'ouvrage: 5 Mo

Extrait

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François G. Schmitt
Directeur de Recherche au CNRS
Directeur du LOG
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OutlineComplexity of aquatic ecosystems
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Many constituents
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Phytoplankton
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Zooplankton
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Microbs, viruses
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Etc.
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Many interactions
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Nutrients come from the bottom
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Phytoplankton needs light and nutrients
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Zooplankton eat phytoplankton
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Larval fishes eat zooplankton
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Dead organisms go to the bottom and become nutrients
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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
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Turbulence linked to light through turbidity
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Turbulence brings nutrients from the bottom to the surface
where phytoplankton live
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Turbulence is an efficient way to travel at low cost for
plankton
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Turbulence enhances contact rates: food and mating
Copepods mating–
Copepods have bad vision (often turbid
waters, or deep waters with no light)
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Have complex sensors to detect changes
in the surrounding fluid, and hence to
detect the approach of other swimming
organisms
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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