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|Titre: ||Contribution a l’étude d’une algue toxique « Ostreopsis Ovata » des côtes oranaises (Algérie occidentale)|
|Auteur(s): ||BAKI Afaf, KERFOUF Ahmed|
|Mots-clés: ||Ostreopsis ovata|
|Date de publication: ||28-jui-2012|
|Résumé: ||Ostreopsis Ovata is a unicellular microalgae, producing palytoxin, which usually lives in
waters of tropical seas. It belongs to the group of dinoflagellates. The presence of this
microalga has been reported several times including in the Mediterranean sea, in Spain in
2004, Italy in 2005 and Algeria in 2009, causing the intoxication of almost 200 people.
Some changes in the conditions of the marine environment very favorable (high atmospheric
pressure, calm sea or presence of artificial barriers (dams and jetties), high water temperature
(about 25 ° C), sea winds, ect ...) have Ostreopsis Ovata allowed to grow in our climate.
The main objective of our work is to acquire to gather relevant scientific knowledge, namely a
literature review on the identification of the species Ostreopsis Ovata and conditions for its
development to have a more objective, and as concrete as possible, sensitive areas and the
hazards posed by the proliferation of this species on human health, flora and fauna.
During blooms (technically called bloom) the concentration of these toxic cells free in the
water exceeds the threshold of 4000 cells per liter of Ostreopsis Ovata "early warning" or 30
000 cells per liter "alert", generates a health impact on coastal users.
Concentrations Ostreopsis Ovata in water are highly variable in space (preferably harbor and
rocky beaches), and in time (the highest concentration is in the summer or the temperature).|
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