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Efflorescence verte 5 Cyanobacteria
 

 

 

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Description
Français :
Inflorescence planctonique. Ce sont a priori des cyanophycées (algue bleue). Dans ce cas, quelques heures (ici une quinzaine d'heure) après le début de l'épisode, les taches bleues se sont étendues et elles s'accumulent sur les bords d'une pièce d'eau (bras d'ancien canal, aujourd'hui fermé).


Les traces en forme de trainées sont des traces laissées par des poissons et des canards qui circulent sur l'eau, "cassant" le biofilm.
La couleur bleue caractérise des zones d'accumulation de pigments bleus libérés par des bacéries mortes. Ici l'eau a une consistance de «soupe» sur les 5 à 10 mm, sous la surface.


Lieu : quai du Vault à Lille, non loin du centre ville (France), après une longue période pluvieuse (non caniculaire, et même sous les moyennes saisonnières, mais avec des nuits inhabituellement douces). Le canal proche (Deûle) est également couvert d’une couche de plancton vert sur de vastes surfaces (centaines de mètres carrés), mais beaucoup moins épaisse. Les échantillons dégagent une forte odeur d'algue (type spiruline).
Date 24 August 2007(2007-08-24)
Source Own work
Author Lamiot

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