Paramètres Physicochimiques et Bioecologiques des Océans sur la Migration des Petits Pélagiques
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Le plateau continental S�n�galais fait partie des zones les plus poissonneuses de l'Afrique de l'Ouest et dans le monde entier. Les c�tes ouest africaines partagent de potentielles ressources halieutiques. Ces zones de fortes exploitations dot�es de politiques d'infrastructures de flottes artisanales et industrielles d�barquent une forte production de produits halieutiques dont 70% constituent les petits p�lagiques . Connus de leur capacit� migratoires, les petits p�lagiques effectuent de grandes migrations dans les c�tes ouest africaines, ceci est d� � une zone qui r�unit un ensemble g�omorphologie avec les cotes frontali�res des eaux continentales et maritimes qui favorisent un �change tr�s important sur le biotope et la bioc�nose mais aussi gr�ce � sa r�putation de la pr�sence d'un ph�nom�ne d'upwelling occasionn� par la pr�sence du vent de l'aliz� qui est le moteur de la remont� des eaux froides, l'origine des nutriments dans les couches sub-superficielles; ainsi de la pr�sence de fortes niches �cologiques notamment les estuaires des �les du Saloum et les archipels des �les du cap vert qui favorisent le syst�me de continuum des eaux continentales et oc�aniques du plateau continental provoquant un �change mutuel des nutriments qui est tr�s important et indispensable aux biodiversit�s . La plupart des petits p�lagiques se d�placent de mani�res saisonni�res sur le plateau continental S�n�galais et dans toute l'Afrique de l'Ouest. Les potentielles esp�ces sont les clup�id�s � savoir sardinale plate ( sardinella maderensis, ronde ( sardinella aurita ) et l'ethmalose (Ethmalosa fimbriata ), les sardines ( sardina pilchardus), les carangid�s qui sont les chinchards noirs ( trachurus trechae et trachurus trachurus et chinchard jaune (caranx rhonchus ), les augraulid�s (angraulis encrasicolus ), et les scombrides ( scomber japonicus) . Beaucoup de ph�nom�nes physiques et biochimiques favorisent les relations bio�cologiques des oc�ans, le renouvellement des eaux, la nature des substrats, la production primaire et biod�gradation des mati�res organiques sont des ph�nom�nes �pisodiques des �cosyst�mes hydrauliques.
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