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dynamique du phytoplancton

Annales de Limnologie - International Journal of Limnology (1)

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Modélisation du développement du phytoplancton dans unerivière canalisée eutrophe : le Lot (France)
A. Dauta
Journal:

Annales de Limnologie - International Journal of Limnology / Volume 22 / Issue 2 / 1986

Published online by Cambridge University Press:

15 August 2009, pp. 119-132

Print publication:

1986
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Le modèle réalisé simule la dynamique d'une population phytoplanctonique composée de 8 espèces, sur le parcoursinférieur (310 km) d'une rivière eutrophe, en réponse aux conditions de température, lumière et nutriments. L'utilisationd'un modèle de type catastrophe appliqué aux conditions d'apparition d'un bloom de cyanophycées, de sa disparition et de ses effets sur les autres espèces est testé : celui-ci génère des phases de développement et de décroissance identiques à celles observées sur le milieu naturel considéré. De même, l'évolution de la composition du phytoplancton (Diatomées, Cyanophycées, Chlorophycées) est reproduite. Ce modèle basé sur des mesures en laboratoire de constantes spécifiques de croissance des algues permet une approche des conditions de développement et de succession des algues.